2024/01/07 更新

写真a

ハットリ ユウジロウ
服部 裕次郎
Hattori Yujiro
所属
医学部 解剖学(生体構造学) 講師
職名
講師
プロフィール
脳神経外科専門医
小児科専門医
内分泌代謝科専門医

下垂体腫瘍ならびに間脳下垂体疾患を中心に、基礎研究・臨床研究に日々励んでおります。
外部リンク

学位

  • 博士(医学) ( 日本医科大学大学院 )

  • 学士(医学) ( 慶應義塾大学 )

研究キーワード

  • 視床下部

  • 下垂体腫瘍

  • 下垂体

  • 内分泌

  • 神経内分泌

研究分野

  • ライフサイエンス / 代謝、内分泌学

  • ライフサイエンス / 脳神経外科学

  • ライフサイエンス / 解剖学

学歴

  • 日本医科大学 大学院医学研究科

    2012年4月 - 2016年4月

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  • 慶應義塾大学   医学部   医学科

    2000年4月 - 2006年3月

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経歴

  • Cedars-Sinai Medical Center   (Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism)   Postdoctoral Scientist

    2023年1月 - 現在

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    国名:アメリカ合衆国

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  • 日本医科大学 大学院医学研究科   解剖学・神経生物学分野(脳神経外科兼務)   講師

    2018年4月 - 現在

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  • 日本医科大学 大学院医学研究科   解剖学・神経生物学分野(脳神経外科兼務)   助教

    2017年4月 - 2018年3月

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  • 日本医科大学   脳神経外科   助教(解剖学・神経生物学兼務)

    2016年6月 - 2017年3月

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  • 日本医科大学   脳神経外科   助教

    2016年5月

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  • 日本医科大学   脳神経外科分野(旧:神経病態解析学分野)   大学院生

    2012年4月 - 2016年4月

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  • 慶應義塾大学医学部   小児科学教室

    2008年4月 - 2012年3月

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  • 平塚市民病院   初期臨床研修医

    2006年4月 - 2008年3月

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  • 日本医科大学

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▼全件表示

所属学協会

▼全件表示

委員歴

  • 日本内分泌学会   評議員  

    2020年4月 - 現在   

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    団体区分:学協会

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  • 日本間脳下垂体腫瘍学会   学術評議員  

    2019年2月 - 現在   

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    団体区分:学協会

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  • 日本脳神経外科学会   学術評議員  

    2016年8月 - 現在   

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    団体区分:学協会

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論文

  • Lung adenocarcinoma metastasis within a pituitary neuroendocrine tumor: a case report with review of literature. 査読

    Koji Suzuki, Shigeyuki Tahara, Yujiro Hattori, Shinichiro Teramoto, Eitaro Ishisaka, Chie Inomoto, Robert Yoshiyuki Osamura, Akio Morita, Yasuo Murai

    Endocrine journal   2023年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Collision tumors involving the metastasis of malignant neoplasms to pituitary neuroendocrine tumors (PitNETs) are extremely rare. We herein report a case involving a patient with lung adenocarcinoma metastasis within a PitNET who exhibited relatively rapid progression of neurological symptoms. A 75-year-old man who underwent tumor resection 36 and 18 years prior to presentation for bladder and colon cancer, respectively, without recurrence presented with bitemporal hemianopsia, ptosis, and diplopia of the right eye. Subsequent magnetic resonance imaging (MRI) revealed a tumor 3.2 cm in diameter that extended from the anterior pituitary gland to the suprasellar region. Gadolinium-enhanced MRI of the tumor showed heterogeneous contrast enhancement. Considering the relatively rapid progression of neurological symptoms, semi-emergency endoscopic endonasal transsphenoidal surgery was performed. Histopathological examination revealed a group of thyroid transcription factor-1- and napsin A-positive papillary proliferating cells intermingled with α-subunit- and steroidogenic factor-1-positive PitNET cells. Thus, the patient was diagnosed with lung adenocarcinoma metastasis within a gonadotroph PitNET. Genetic testing revealed the presence of an EGFR (Ex-19del) mutation, after which chemotherapy was initiated. Additional stereotactic radiotherapy was performed for the residual tumor in the sella turcica. With continued chemotherapy, good control of both the primary and metastatic tumors was noted after 24 months after surgery. Cases of malignant neoplasm metastasis within a PitNET are difficult to diagnose. In the case of a sella turcica tumor with relatively rapid progression of neurological symptoms, early surgical intervention is recommended given the possibility of a highly proliferative tumor and the need to obtain pathologic specimens.

    DOI: 10.1507/endocrj.EJ23-0372

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  • Endoscopic spinal cord untethering using a 1 cm skin incision technique in pediatrics: a technical case report. 査読 国際誌

    Eitaro Ishisaka, Shigeyuki Tahara, Atsushi Tsukiyama, Toshiki Nozaki, Yujiro Hattori, Akio Morita, Yasuo Murai

    BMC pediatrics   23 ( 1 )   604 - 604   2023年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    BACKGROUND: Spinal cord untethering by sectioning the filum terminale is commonly performed in tethered cord syndrome patients with minor abnormalities such as filar lipoma, thickened filum terminale, and low conus medullaris. Our endoscopic surgical technique, using the interlaminar approach, allows for sectioning the filum terminale through a very small skin incision. To our knowledge, this procedure has not been previously reported. This is the first case report involving a 1 cm skin incision. CASE PRESENTATION: A 9-month-old male patient was referred to our neurosurgical department due to a coccygeal dimple. MRI revealed a thickened fatty filum. After considering the treatment options for this patient, the parents agreed to spinal cord untethering. A midline 1 cm skin incision was made at the L4/5 vertebral level. Untethering by sectioning the filum terminale was performed by full endoscopic surgery using the interlaminar approach. The procedure was uneventful and there were no postoperative complications. CONCLUSIONS: In terms of visibility and minimizing invasiveness, our surgical technique of using the interlaminar approach with endoscopy allows for untethering by sectioning the filum terminale through a very small skin incision.

    DOI: 10.1186/s12887-023-04390-7

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  • Comparison of prophylactic antibiotics for endonasal transsphenoidal surgery using a national inpatient database in Japan. 査読 国際誌

    Yujiro Hattori (corresponding), Shigeyuki Tahara, Shotaro Aso, Kanako Makito, Hiroki Matsui, Kiyohide Fushimi, Hideo Yasunaga, Akio Morita

    The Journal of antimicrobial chemotherapy   78 ( 12 )   2909 - 2914   2023年10月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    BACKGROUND: The choice of prophylactic antibiotics for use in endonasal transsphenoidal surgery (ETSS) lacks universal standards. This study aimed to investigate the effectiveness of cefazolin, ampicillin and third-generation cephalosporins for preventing postoperative meningitis and secondary outcomes (in-hospital death and the combination of pneumonia and urinary tract infection) in patients who have undergone ETSS. METHODS: The study used data from the Diagnosis Procedure Combination database in Japan. Data from 10 688 patients who underwent ETSS between April 2016 and March 2021 were included. Matching weight analysis based on propensity scores was conducted to compare the outcomes of patients receiving cefazolin, ampicillin or third-generation cephalosporins as prophylactic antibiotics. RESULTS: Of the 10 688 patients, 9013, 102 and 1573 received cefazolin, ampicillin and third-generation cephalosporins, respectively. The incidence of postoperative meningitis did not significantly differ between the cefazolin group and the ampicillin group (OR, 1.02; 95% CI, 0.14-7.43) or third-generation cephalosporins group (OR, 0.81; 95% CI, 0.10-6.44). Similarly, in-hospital death and the composite incidence of pneumonia and urinary tract infection did not differ between the cefazolin group and the ampicillin or third-generation cephalosporins group. CONCLUSIONS: Cefazolin, ampicillin and third-generation cephalosporins as perioperative prophylactic antibiotics for ETSS do not differ significantly in terms of preventing meningitis.

    DOI: 10.1093/jac/dkad329

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  • Endoscopic surgery versus craniotomy for spontaneous intracerebral hemorrhage in the late elderly patients. 査読 国際誌

    Shigeyuki Tahara, Yujiro Hattori, Shotaro Aso, Kazuaki Uda, Ryosuke Kumazawa, Hiroki Matsui, Kiyohide Fushimi, Hideo Yasunaga, Akio Morita

    Journal of stroke and cerebrovascular diseases : the official journal of National Stroke Association   32 ( 11 )   107327 - 107327   2023年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    OBJECTIVES: To compare the prognosis of late elderly patients with spontaneous intracerebral hemorrhage (ICH) treated by endoscopic evacuation and craniotomy MATERIALS AND METHODS: Using the Diagnosis Procedure Combination database, we identified patients aged ≥ 75 years who underwent surgery for spontaneous ICH within 48 hours after admission between April 2014 and March 2018. Eligible patients were classified into two groups according to the type of surgery (endoscopic surgery and craniotomy). Propensity-score matching weight analysis was conducted to compare the good neurological outcome modified Rankin Scale (mRS) score (0-4) at discharge as the primary endpoint between the two groups. Secondary endpoints were postoperative meningitis, tracheostomy, reoperation within 3 days and total hospitalization costs. RESULTS: Among the 5,396 eligible patients, endoscopic surgery and craniotomy were performed in 895 and 4,501 patients, respectively. In the propensity-score matching weight analysis, all covariates were well balanced. The proportions of patients with a good prognosis (mRS score at discharge: 0-4) did not significantly differ between the surgical procedures (42.1% vs. 42.8%, p = 0.828). The proportions of meningitis, tracheostomy and reoperation were not significantly different between the two groups. Hospitalization costs were significantly higher in the craniotomy group than in the endoscopic surgery group (25,536 vs. 29,603 US dollars, p = 0.012). CONCLUSIONS: Inhospital outcomes did not differ between endoscopic and open surgeries for spontaneous ICH in the late-stage elderly patients aged ≥75 years. Hospitalization costs were significantly higher in the craniotomy group, suggesting that endoscopic surgery may be more acceptable.

    DOI: 10.1016/j.jstrokecerebrovasdis.2023.107327

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  • Assessment of anterior pituitary reserve capacity based on growth hormone response to growth hormone-releasing peptide-2 test in the elderly 査読 国際誌

    Shinichiro Teramoto, Shigeyuki Tahara, Yujiro Hattori, Akihide Kondo, Akio Morita

    Growth Hormone & IGF Research   71   101545 - 101545   2023年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    OBJECTIVE: The growth hormone (GH)-releasing peptide-2 (GHRP-2) test is relatively safe among endocrine stimulation tests for the elderly. We investigated whether anterior pituitary function in elderly patients could be assessed on the basis of GH response to the GHRP-2 test. DESIGN: Sixty-five elderly patients aged 65 years and older with non-functioning pituitary neuroendocrine tumor (PitNET) who underwent pituitary surgery and preoperative endocrine stimulation tests were classified into the "GH normal group" and "GH deficiency group" based on GH response to the GHRP-2 test. The baseline characteristics and anterior pituitary function were compared between the groups. RESULTS: Thirty-two patients were assigned to the GH normal group and 33 to the GH deficiency group. The cortisol and adrenocorticotropic hormone (ACTH) results in the corticotropin-releasing hormone test were significantly higher in the GH normal group than in the GH deficiency group (p < 0.001). The relationship between the cortisol and ACTH results and the GH response revealed significant correlations (p < 0.001). In addition, receiver operating characteristic curve analysis identified that the optimal cut-off point for a peak GH level in the correlation between adrenocortical function and GH response to the GHRP-2 test was 8.08 ng/mL (specificity 0.868, sensitivity 0.852). CONCLUSION: The present study indicated that adrenocortical function was significantly correlated with GH response to the GHRP-2 test in elderly patients before pituitary surgery. For elderly patients with non-functioning PitNET, GH response to the GHRP-2 test may support in diagnosing adrenocortical insufficiency.

    DOI: 10.1016/j.ghir.2023.101545

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  • Exploring endocrinological pitfalls in pituitary surgery in the elderly 査読 国際誌

    Shinichiro Teramoto, Shigeyuki Tahara, Izumi Fukuda, Yujiro Hattori, Akihide Kondo, Hitoshi Sugihara, Akio Morita

    Heliyon   9 ( 6 )   e17060 - e17060   2023年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    BACKGROUND: Endoscopic transsphenoidal surgery (ETSS) is performed more frequently in elderly patients. We investigated endocrinological pitfalls in pituitary surgery in the elderly by a comparative study focusing only on elderly patients. METHODS: Ninety-nine elderly patients aged 65 years and over with non-functioning pituitary adenoma (NFPA) who underwent ETSS were retrospectively examined and classified into the early (aged 65-74 years) and late (aged 75 years and over) elderly groups. The baseline characteristics and anterior pituitary function were compared between the groups. RESULTS: Seventy patients were assigned to the early elderly group and 29 to the late elderly group. Thyroid-stimulating hormone (TSH) response in preoperative and postoperative thyrotropin-releasing hormone (TRH) tests revealed a significant difference between the groups. Preoperative and postoperative TSH responses were significantly correlated in both groups. Residual analysis of the correlation between preoperative free triiodothyronine (T3) secretion quantity and preoperative TSH response in both groups, which was significant, indicated that preoperative TSH response was significantly normal when preoperative free T3 secretion quantity was normal in the early elderly group, but preoperative free T3 secretion quantity was significantly lower regardless of preoperative TSH response in the late elderly group. CONCULSIONS: The present study suggested that preoperative and postoperative TSH secretory capacity was presumed to be normal when preoperative free T3 levels were normal in the early elderly patients with NFPA. On the other hand, TSH secretory capacity in the late elderly patients could only be assessed by the TRH test, which should be taken into account.

    DOI: 10.1016/j.heliyon.2023.e17060

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  • Concurrent IgG4-related hypophysitis and clinically nonfunctioning gonadotroph pituitary neuroendocrine tumor. 査読 国際誌

    Shigeyuki Tahara, Robert Yoshiyuki Osamura, Yujiro Hattori, Eitaro Ishisaka, Chie Inomoto, Hitoshi Sugihara, Akira Teramoto, Akio Morita

    BMC endocrine disorders   23 ( 1 )   96 - 96   2023年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    BACKGROUND: Some patients develop immunoglobulin G4 (IgG4)-related hypophysitis associated with systemic diseases. More than 30 cases of IgG4-related hypophysitis have been reported. However, biopsy has rarely been performed in these patients, and none have had an associated pituitary neuroendocrine tumor (PitNET). We present a case of concurrent IgG4-related hypophysitis and PitNET. CASE PRESENTATION: A 56-year-old Japanese man arrived at the hospital with visual impairment, bitemporal hemianopia, and right abducens nerve palsy. Magnetic resonance imaging revealed pituitary body and stalk swelling as well as a small poorly enhanced right anterior lobe mass. Laboratory and loading test results suggested hypopituitarism. Because IgG4 level was elevated, a systemic examination was performed; multiple nodules were found in both lung fields. The diagnosis was based on an endoscopic transnasal biopsy of the pituitary gland. A histopathological examination revealed a marked infiltration of plasma cells into the pituitary gland, which was strongly positive for IgG4. The histological features of the resected tumor were consistent with those of gonadotroph PitNET, which was immunohistochemically positive for follicle-stimulating hormone-β and steroidogenic factor-1, and no plasma cell infiltration was observed. Based on the histopathological examination results, steroid therapy was initiated, which reduced pituitary gland size and serum IgG4 levels. DISCUSSION AND CONCLUSIONS: This is the first reported case of IgG4-related hypophysitis with PitNET. Although no pathological findings indicating a relationship between the two conditions were found, we were able to preoperatively differentiate multiple lesions via detailed diagnostic imaging.

    DOI: 10.1186/s12902-023-01353-y

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  • Creation of low cost, simple, and easy-to-use training kit for the dura mater suturing in endoscopic transnasal pituitary/skull base surgery. 査読 国際誌

    Yujiro Hattori (corresponding), Eitaro Ishisaka, Shigeyuki Tahara, Koji Suzuki, Shinichiro Teramoto, Akio Morita

    Scientific reports   13 ( 1 )   6073 - 6073   2023年4月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Training kits for laparoscopes for deep suturing under endoscopes are commercially available; however, previously reported training kits for endoscopic transnasal transsphenoidal pituitary/skull base surgery (eTSS) were not available in the market. Moreover, the previously reported low cost, self-made kit has the drawback of being unrealistic. This study aimed to create a low cost training kit for eTSS dura mater suturing that was as close to real as possible. Most necessary items were obtained from the 100-yen store ($1 store) or from everyday supplies. As an alternative to the endoscope, a stick-type camera was used. Through the assembly of the materials, a simple and easy-to-use training kit was created, which is almost identical to the actual dural suturing situation. In eTSS, a simple and easy-to-use training kit for dural suturing was successfully created at a low cost. This kit is expected to be used for deep suture operations and the development of surgical instruments for training.

    DOI: 10.1038/s41598-023-32311-2

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  • Immunohistochemistry for ESR2 with a mouse monoclonal antibody (PPZ0506) 査読

    Masahiro Morishita, Shimpei Higo, Yujiro Hattori, Mina Ozawa, Mai Otsuka, Keisuke Matsumoto, Hitoshi Ozawa, Hirotaka Ishii

    Journal of Nippon Medical School   90 ( 2 )   138 - 140   2023年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Medical Association of Nippon Medical School  

    DOI: 10.1272/jnms.jnms.2023_90-209

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  • Estrogen receptor α isoforms generated by alternative use of cryptic exons

    Hirotaka Ishii, Yujiro Hattori, Hitoshi Ozawa

    Journal of Nippon Medical School   90 ( 5 )   364 - 371   2023年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Medical Association of Nippon Medical School  

    Estrogen receptor α (ERα) regulates several physiological functions. In pathophysiological conditions, ERα is involved in the development and progression of estrogen-sensitive tumors. The ERα gene contains multiple 5'-untranslated exons and eight conventional coding exons and presents multiple isoforms generated by alternative promoter usage and alternative splicing. This gene also possesses non-conventional exons in the 3'- and intronic regions, and alternative use of cryptic exons contributes to further diversity of ERα mRNAs and proteins. Recently, the genomic organization of ERα genes and the splicing profiles of their transcripts were comparatively analyzed in humans, mice, and rats, and multiple ERα isoforms with distinct structures and functions were identified. These transcripts contain cryptic sequences that encode insertion-containing or truncated ERα proteins. In particular, alternative cryptic exons with in-frame stop codons yield transcripts encoding C-terminally-truncated ERα proteins. The C-terminally-truncated ERα isoforms lack part or all of the ligand-binding domain but possess an isoform-specific sequence. Some of these isoforms exhibit constitutive transactivation and resistance to estrogen receptor antagonists. Although numerous studies have reported conflicting results regarding their functions, the critical determinant for their gain-of-function has been identified structurally. Here we review recent progress in ERα variant research concerning the genomic organization of ERα genes, splicing profiles of ERα transcripts, and transactivation properties of ERα isoforms.

    DOI: 10.1272/jnms.jnms.2023_90-507

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  • Outcomes After Endoscopic Evacuation Versus Evacuation Using Craniotomy or Stereotactic Aspiration for Spontaneous Intracerebral Hemorrhage: Analysis Using a Japanese Nationwide Database. 査読 国際誌

    Shigeyuki Tahara, Yujiro Hattori, Shotaro Aso, Kazuaki Uda, Ryosuke Kumazawa, Hiroki Matsui, Kiyohide Fushimi, Hideo Yasunaga, Akio Morita

    Neurocritical care   38 ( 3 )   667 - 675   2022年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    BACKGROUND: Various surgical methods are available for managing large intracerebral hemorrhage. This study compared the prognosis of patients with spontaneous intracerebral hemorrhage who underwent endoscopic evacuation, stereotactic aspiration, and craniotomy by using a nationwide inpatient database in Japan. METHODS: Using the Diagnosis Procedure Combination database, we identified patients who underwent surgery for spontaneous intracerebral hemorrhage within 48 h after admission between April 2014 and March 2018. Eligible patients were classified into three groups according to the type of surgery (endoscopic surgery, stereotactic surgery, and craniotomy). Propensity score matching weight analysis was conducted to compare poor modified Rankin Scale score at discharge (severe disability or death) and hospitalization cost among the groups. RESULTS: Among 17,860 eligible patients, craniotomy, stereotactic surgery, and endoscopic surgery were performed in 14,354, 474, and 3,032 patients, respectively. In the matching weight analysis, all covariates were well balanced. Compared with the endoscopic surgery group, the proportion of poor prognosis (modified Rankin Scale score at discharge of 5 or 6) was significantly higher in craniotomy groups (odds ratio 2.51, 95% confidence interval 1.11-5.68; p = 0.028). Subgroup analysis based on hemorrhage location and consciousness level at the time of admission showed no significant difference between the surgical procedures. Hospitalization costs were significantly higher in the craniotomy group than in the endoscopic surgery group (difference US $9,724, 95% confidence interval 2,169-17,259; p = 0.011). CONCLUSIONS: Endoscopic surgery for spontaneous intracerebral hemorrhage was associated with improved prognosis compared with craniotomy at the hospital discharge. Future large-scale clinical trials are needed to evaluate the optimal surgical techniques for intracerebral hemorrhage.

    DOI: 10.1007/s12028-022-01634-9

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  • Optimized Mouse-on-mouse Immunohistochemical Detection of Mouse ESR2 Proteins with PPZ0506 Monoclonal Antibody. 査読

    Mina Ozawa, Yujiro Hattori, co-first author, Shimpei Higo, Mai Otsuka, Keisuke Matsumoto, Hitoshi Ozawa, Hirotaka Ishii

    Acta histochemica et cytochemica   55 ( 5 )   159 - 168   2022年10月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Despite the physiological significance of ESR2, a lack of well-validated detection systems for ESR2 proteins has hindered progress in ESR2 research. Thus, recent identification of a specific anti-human ESR2 monoclonal antibody (PPZ0506) and its specific cross-reactivity against mouse and rat ESR2 proteins heightened momenta toward development of appropriate immunohistochemical detection systems for rodent ESR2 proteins. Building upon our previous optimization of ESR2 immunohistochemical detection in rats using PPZ0506, in this study, we further aimed to optimize mouse-on-mouse immunohistochemical detection using PPZ0506. Our assessment of several staining conditions using paraffin-embedded ovary sections revealed that intense heat-induced antigen retrieval, appropriate blocking, and appropriate antibody dilutions were necessary for optimization of mouse-on-mouse immunohistochemistry. Subsequently, we applied the optimized immunostaining method to determine expression profiles of mouse ESR2 proteins in peripheral tissues and brain subregions. Our analyses revealed more localized distribution of mouse ESR2 proteins than previously assumed. Moreover, comparison of these results with those obtained in humans and rats using PPZ0506 revealed interspecies differences in ESR2 expression. We expect that our optimized methodology for immunohistochemical staining of mouse ESR2 proteins will help researchers to solve multiple lines of controversial evidence concerning ESR2 expression.

    DOI: 10.1267/ahc.22-00043

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  • An Overview of Pituitary Incidentalomas: Diagnosis, Clinical Features, and Management 査読 国際誌

    Shigeyuki Tahara, Yujiro Hattori, Koji Suzuki, Eitaro Ishisaka, Shinichiro Teramoto, Akio Morita

    Cancers   14 ( 17 )   4324   2022年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    Pituitary incidentalomas are tumors or mass lesions of the pituitary gland. These are incidentally discovered during imaging studies for symptoms that are not causally related to pituitary diseases. The most common symptom that triggers an examination is headache, and the most common type of pituitary incidentalomas are pituitary neuroendocrine tumors (PitNETs) and Rathke cleft cysts. The existing treatment strategy is controversial; however, surgical resection is recommended in cases of clinically non-functioning PitNETs with optic chiasm compression. In contrast, cystic lesions, such as Rathke cleft cysts, should be followed if the patients are asymptomatic. In this case, MRI and pituitary function tests are recommended every six months to one year; if there is no change, the follow-up period should be extended. The natural history of PitNET is partially known, and the management of pituitary incidentalomas is determined by this history. However, the pathogenesis of PitNET has significantly changed with the new World Health Organization classification, and follow-up is important based on this new classification. Therefore, a high level of evidence-based research is needed to consider treatment guidelines for pituitary incidentalomas in the future.

    DOI: 10.3390/cancers14174324

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  • Trends in surgical procedures for spontaneous intracerebral hemorrhage in Japan. 査読 国際誌

    Shigeyuki Tahara, Yujiro Hattori, Shotaro Aso, Kazuaki Uda, Ryosuke Kumazawa, Hiroki Matsui, Kiyohide Fushimi, Hideo Yasunaga, Akio Morita

    Journal of stroke and cerebrovascular diseases : the official journal of National Stroke Association   31 ( 9 )   106664 - 106664   2022年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    OBJECTIVES: Minimally invasive surgery for spontaneous intracerebral hemorrhage (ICH) has become increasingly popular in recent years. However, there are no reports on the recent trends in surgical procedures for spontaneous ICH. To investigate current trends in surgical methods for spontaneous ICH using a nationwide inpatient database from Japan. MATERIALS AND METHODS: Patients who underwent surgery for spontaneous ICH between April 2014 and March 2018 were identified in a nationwide inpatient database from Japan. We examined patient characteristics, diagnoses, types of surgery, complications, and discharge status. RESULTS: We identified 21,129 inpatients who underwent surgery for spontaneous ICH. The procedures were as follows: 16,256 (76.9%) transcranial hemorrhage evacuations, 3722 (17.6%) endoscopic hemorrhage evacuations, and 1151 (5.4%) stereotactic aspirations of hemorrhage. Patients tended to receive transcranial hemorrhage evacuations in hospitals with fewer surgical cases. The proportions of endoscopic hemorrhage evacuations increased annually, whereas those of stereotactic surgery decreased. The proportions of transcranial surgery remained almost unchanged. Tracheostomy and hospitalization costs were lower in the stereotactic aspirations of hemorrhage group, and the proportions of reoperation were higher in the endoscopic hemorrhage evacuations group. CONCLUSIONS: The use of endoscopic surgery for spontaneous ICH has increased in Japan. This study can form the basis of future clinical investigations into spontaneous ICH surgery.

    DOI: 10.1016/j.jstrokecerebrovasdis.2022.106664

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  • Injury to the Extrasellar Portion of the Internal Carotid Artery during Endoscopic Transsphenoidal Surgery: A Case Report. 査読 国際誌

    Shinichiro Teramoto, Shigeyuki Tahara, Yasuo Murai, Shun Sato, Yujiro Hattori, Akihide Kondo, Akio Morita

    Frontiers in surgery   9   895233 - 895233   2022年

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    記述言語:英語  

    Background: Injury to the internal carotid artery (ICA) during endoscopic transsphenoidal surgery (ETSS) is a serious complication with a risk of mortality. ICA injury during ETSS usually occurs during intrasellar manipulations and rarely occurs in the extrasellar portion. Several hemostatic procedures have been proposed for ICA injury in the intrasellar portion, whereas hemostatic methods for ICA injury in the extrasellar portion, where the ICA is surrounded by bone structures, are less well known. Case Presentation: A 65-year-old man with an incidental pituitary tumor underwent ETSS. The petrous portion of the left ICA was injured during resection of the sphenoid septum connected with left carotid prominence using a cutting forceps. Bleeding was too heavy for simple hemostatic techniques. Hemostasis using a crushed muscle patch was tried unsuccessfully during controlling of the bleeding. Eventually, the injured site of the ICA was covered with cotton patties followed by closing with a vascularized pedicled nasoseptal flap. Cerebral angiography immediately after surgery showed no extravasation from the injured site of the left ICA petrous portion. However, a carotid-cavernous sinus fistula originating from the injured ICA site was detected 7 days after surgery, so the vascular reconstructive surgery combined with left ICA occlusion was performed. The overall postoperative course was uneventful. Conclusion: We believe that emergency application of the cottonoids may be effective for hemostasis against ICA injury in the extrasellar portion during ETSS, but further vascular reconstruction combined with ICA occlusion on the injured side and removal of the cottonoids would be required.

    DOI: 10.3389/fsurg.2022.895233

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  • Prophylactic steroid administration and complications after transsphenoidal pituitary surgery: a nationwide inpatient database study in Japan 査読 国際誌

    Yujiro Hattori (corresponding), Shigeyuki Tahara, Shotaro Aso, Hiroki Matsui, Kiyohide Fushimi, Hideo Yasunaga, Akio Morita

    British Journal of Anaesthesia   127 ( 2 )   e41 - e43   2021年8月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/j.bja.2021.04.006

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  • Bacterial Flora in the Sphenoid Sinus Changes with Perioperative Prophylactic Antibiotic Administration. 査読

    Eiichi Baba, Yujiro Hattori (co-first author), Shigeyuki Tahara, Akio Morita

    Neurologia medico-chirurgica   61 ( 6 )   361 - 366   2021年6月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The complications of endonasal transsphenoidal surgery (ETSS) include meningitis and sinusitis, and these complications are troublesome. Some reports have investigated the type of bacteria and the susceptibility of sphenoid sinus mucosal flora to drugs. However, most specimens can be collected after perioperative antibiotic administration. In this study, 95 and 103 sphenoid sinus mucosal samples collected during ETSS from September 2013 to February 2015 and from June 2017 to January 2019, respectively, were examined for bacterial culture. Sphenoid sinus mucosal samples were collected after antibiotic administration in the first period, whereas samples were collected before antibiotic administration in the second period. Hence, the specimens in the second period were not affected by antibiotics. Moreover, drug susceptibility tests for the detected bacteria were performed. Overall, 52 and 51 bacterial isolates were collected during both periods. Gram-positive cocci (GPCs), including Staphylococcus aureus and Staphylococcus epidermidis, were more common in the non-antibiotic group than in the antibiotic group (p <0.01). However, the proportion of gram-negative rods (GNRs) did not significantly differ between the two groups (p = 0.54). The antibiotic group had a significantly higher proportion of bacteria resistant to ampicillin (p <0.01) and first-generation cephalosporin (p = 0.01) than the non-antibiotic group. In conclusion, there was a difference in bacterial flora in the sphenoid sinus mucosal samples collected before and after intraoperative antibiotic administration.

    DOI: 10.2176/nmc.oa.2020-0387

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  • Optimization of immunohistochemical detection of rat ESR2 proteins with well-validated monoclonal antibody PPZ0506. 査読 国際誌

    Yujiro Hattori, Hirotaka Ishii, Shimpei Higo, Mai Otsuka, Moeko Kanaya, Keisuke Matsumoto, Mina Ozawa, Hitoshi Ozawa

    Molecular and cellular endocrinology   523   111145 - 111145   2021年3月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Although there are few well-validated antibodies against ESR2 proteins, a recent validation assessment identified a specific monoclonal antibody against human ESR2 proteins (PPZ0506). Furthermore, our previous study confirmed its cross-reactivity and specificity against rodent ESR2 proteins, enabling the determination of true ESR2 distribution profiles in rodents. Therefore, we aimed to determine optimal conditions for ESR2 detection by PPZ0506 immunostaining and analyze ESR2 distribution in rats. We evaluated several staining conditions using paraffin-embedded and frozen ovary sections. Immunohistochemical staining with PPZ0506 antibody required strong antigen retrieval and appropriate antibody dilution. Subsequent immunohistochemical analysis in multiple tissues under optimized conditions revealed that rat ESR2 proteins are expressed in a more localized manner than previously assumed. Our results suggest that previous immunohistochemical studies using inadequately validated antibodies against ESR2 proteins overestimated their distribution profiles. We expect that optimized immunohistochemical detection with PPZ0506 antibody can help researchers solve several conflicting problems in ESR2 research.

    DOI: 10.1016/j.mce.2020.111145

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  • Snowfall reduces the risk of chronic subdural hematoma onset: Analysis of an administrative database in Japan. 査読 国際誌

    Kazunori Oda, Shotaro Aso, Yujiro Hattori, Fumio Yamaguchi, Hiroki Matsui, Kiyohide Fushimi, Hideo Yasunaga, Akio Morita

    Surgical neurology international   12   69 - 69   2021年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Background: Chronic subdural hematoma (CSDH) is a frequently observed disease in neurosurgical practice. Although first snowfall has been considered to increase the onset of CSDH, few reports have assessed the relationship between snowfall and CSDH. In this study, we aimed to investigate the relationship between CSDH onset and first snowfall events. Methods: This retrospective study was based on the Japanese Diagnosis Procedure Combination inpatient database from July 1, 2010, to March 31, 2016, and on the global observation of snowfall events in Japan obtained from the Japan Meteorological Agency. We used a binomial approximation to evaluate the average number of CSDH patients after first snowfall events compared with that before first snowfall events. We calculated the odds ratio of CSDH onset on the first snowfall. Results: We identified 8526 CSDH patients from the database. A total of 5573 (65.4%) were observed before first snowfall events, and 2953 (34.6%) after first snowfall events. The first snowfall of winter was significantly associated with a reduction in the occurrence of CSDH (odds ratio, 0.53; 95% confidence interval; 0.51-0.55). In subgroup analysis, only the first snowfall in October was not associated with reduction in the occurrence of CSDH. Conclusion: First snowfall events did not affect the onset of CSDH in Japan.

    DOI: 10.25259/SNI_882_2020

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  • Quantitative expression data of human estrogen receptor α variants in non-functioning pituitary adenomas obtained by reverse transcription-digital polymerase chain reaction analysis. 査読 国際誌

    Yujiro Hattori (corresponding), Hirotaka Ishii, Shigeyuki Tahara, Akio Morita, Hitoshi Ozawa

    Data in brief   33   106452 - 106452   2020年12月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Expression profiles of gonadal steroid receptor variants have been reportedly associated with malignancy in breast and prostate cancers [1,2]. However, such associations with pituitary tumors remain unclear. Therefore, the expression levels of the wild-type ESR1 (ERα66) and the ESR1 variants (ERαi34, ERαi45c, and ERαΔ5) transcripts encoding constitutively active ERα proteins with C-terminal truncation in non-functioning pituitary adenomas (NFPAs) were evaluated using reverse transcription-digital polymerase chain reaction. The results revealed that the expression levels of the variants were approximately two orders of magnitude lower than that of ERα66 in NFPAs. These data were based on our previous article entitled "Accurate assessment of estrogen receptor profiles in non-functioning pituitary adenomas using RT-digital PCR and immunohistochemistry" [3].

    DOI: 10.1016/j.dib.2020.106452

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  • Accurate assessment of estrogen receptor profiles in non-functioning pituitary adenomas using RT-digital PCR and immunohistochemistry. 査読 国際誌

    Yujiro Hattori (corresponding), Hirotaka Ishii, Shigeyuki Tahara, Akio Morita, Hitoshi Ozawa

    Life sciences   260   118416 - 118416   2020年11月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    BACKGROUND: Non-functioning pituitary adenomas (NFPAs) are common pituitary tumors, and surgery is generally the only treatment option. Few attempts have been made to explore target molecules for the development of NFPA pharmacological treatments. METHOD: We quantitatively assessed the expression profiles of estrogen receptor (ER) transcripts and proteins in NFPA samples, using reverse transcription-digital polymerase chain reaction (RT-dPCR) and immunohistochemistry, and further investigated the correlations between the expression levels of ER and those of downstream responsive genes. All patients had undergone surgery at the same high-volume hospital. A total of 20 patients with NFPAs were included. All patients were new-onset, and none were diagnosed with intratumoral hemorrhages or cysts. RESULTS: NFPA samples exhibited a bimodal ESR1 expression pattern and were categorized into significantly different high- and low-ESR1 expression level groups (P < 0.05). In contrast, expression levels of ESR1 variants and ESR2 could barely be detected. Similar results were obtained through the immunohistochemical staining of NFPAs, using well-validated antibodies against ERs. The expression levels of ESR1 positively correlated with those of GREB1, an estrogen-responsive gene [correlation coefficient (r) = 0.623, P = 0.003]. CONCLUSIONS: ESR1 expression levels in NFPAs exhibited a bimodal pattern and were positively correlated with GREB1 expression levels. The accurate assessment of ER expression levels may further advance future NFPA-related research.

    DOI: 10.1016/j.lfs.2020.118416

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  • Skull Base Dural Closure Using a Modified Nonpenetrating Clip Device via an Endoscopic Endonasal Approach: Technical Note. 査読

    Shinichiro Teramoto, Shigeyuki Tahara, Yujiro Hattori, Akio Morita

    Neurologia medico-chirurgica   60 ( 10 )   514 - 519   2020年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Skull base reconstruction after an endoscopic endonasal approach into the cerebrospinal fluid (CSF) space is always challenging. Various reconstructive methods are available, but no standard technique is established. This report describes the endoscopic skull base dural closure using a modified nonpenetrating clip device with shaft length of 15 cm. Six patients with an intra-suprasellar or suprasellar tumor who underwent extended endoscopic endonasal transsphenoidal surgery were targeted. For closure of the skull base dural defect after tumor removal, fascia lata was first placed as an inlay graft and was subsequently fixed with the dura using a modified nonpenetrating clip device. No CSF leakage from the closed dura with an inlay fascia lata fixed with clips was confirmed by the Valsalva maneuver. To complete skull base reconstruction, fascia lata was then positioned as an overlay graft and covered with vascularized pedicled nasoseptal flaps. Five of six patients experienced no CSF rhinorrhea postoperatively. The modified nonpenetrating clip device may achieve effective dural closure in the deep and narrow nasal cavity. We introduce this clip device technique as one of the endoscopic skull base dural closure methods.

    DOI: 10.2176/nmc.tn.2020-0103

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  • Recurrent Cervical Spinal Epidural Hematoma: Case Report and Literature Review. 査読

    Daijiro Morimoto, Kyongsong Kim, Asami Kubota, Rinko Kokubo, Naotaka Iwamoto, Yujiro Hattori, Akio Morita

    NMC case report journal   7 ( 4 )   157 - 160   2020年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Neurosurgical Society  

    Spinal epidural hematoma (SEDH) is an uncommon pathology. Here, we report a case of SEDH with recurrences, along with a literature review of relevant cases to identify characteristics of SEDH recurrence. A 13-year-old girl experienced sudden-onset of back pain and bilateral leg weakness. She was diagnosed with a cervical idiopathic epidural hematoma, and the symptoms subsided with conservative management. Four months after the event, she again experienced back pain due to recurrence of the cervical epidural hematoma, but she was observed because no neurological deficits could be detected. Fifteen months after the initial SEDH, she experienced severe back pain and tetra-paresis due to recurrence. The SEDH was located in the left ventral and dorsal aspect at the C6-T1 level, with severe spinal cord compression. The hematoma was removed through left hemilaminectomy. Bleeding was noted from the epidural venous plexus along the left C6 spinal root, which had coagulated. After hematoma resection, her symptoms gradually improved, and she was discharged 3 weeks after surgery without any neurological deficits. No hematoma recurrence has since been experienced. Recurrent SEDH is relatively rare, with only 11 cases previously reported. Recurrent hematoma cases are more common in young, female patients, while SEDH, in general, is more common in males in their late forties. The recurrence interval is shorter in non-surgical cases than those requiring surgery. Knowledge of these characteristics may be useful in the future management of SEDH.

    DOI: 10.2176/nmccrj.cr.2019-0253

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  • Pituitary surgery's epidemiology using a national inpatient database in Japan. 査読 国際誌

    Yujiro Hattori (corresponding), Shigeyuki Tahara, Shotaro Aso, Hiroki Matsui, Kiyohide Fushimi, Hideo Yasunaga, Akio Morita

    Acta neurochirurgica   162 ( 6 )   1317 - 1323   2020年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    BACKGROUND: Between 2010 and 2014, microscopic transsphenoidal surgery (mTSS) was performed more frequently than endoscopic TSS (eTSS) in the USA. However, few epidemiological studies on pituitary surgery are currently available. METHODS: We performed a retrospective study on patients who had undergone pituitary surgery between July 2010 and March 2016. To this end, a nationwide inpatient database in Japan was used. Patients' characteristics, diagnoses, types of surgery, complications, and discharge status were examined. RESULTS: A total of 16,253 inpatients who received pituitary surgery were identified. Patients were diagnosed with diseases for insurance claims described below: pituitary adenoma, hyperprolactinemia, other pituitary disorders (e.g., Rathke's cleft cyst), hyperpituitarism, craniopharyngioma, acromegaly, Cushing's disease, and pituitary cancer. Among them, pituitary adenomas, primarily the non-functioning ones, were the most frequent (66.9%). A total of 14,285 (88%) patients underwent TSS, while 1968 (12%) patients were treated using transcranial surgery. The number of patients undergoing TSS increased each year. The number of eTSS operations was 8140 (77%) and that of mTSS operations was 2419 (23%). Of note, eTSS increased each year. We found that high-volume hospitals more frequently selected eTSS. Compared with mTSS, eTSS was associated with a reduction of hyponatremia incidence (odds ratio, 0.69; p = 0.019). Additionally, it was not associated with other major complications. CONCLUSION: The present study showed that both TSS and eTSS increased on a yearly basis. We believe that the present study will be the basis of future epidemiological investigations of pituitary surgery.

    DOI: 10.1007/s00701-020-04270-4

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  • MON-274 Analysis of Perioperative Prophylactic Steroid for Pituitary Surgery Using a National Inpatient Database in Japan 査読

    Yujiro Hattori (corresponding), Shigeyuki Tahara, Shotaro Aso, Hiroki Matsui, Kiyohide Fushimi, Hideo Yasunaga, Akio Morita

    Journal of the Endocrine Society   4 ( Supplement_1 )   2020年5月

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    担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Endocrine Society  

    <title>Abstract</title>
    BACKGROUND: There is not enough evidence regarding the need for perioperative prophylactic steroid at the time of transsphenoidal pituitary surgery [1], and it is currently administered empirically. In patients with normal preoperative adrenal function, the meta-analysis of nonrandomized studies [2] and only two randomized controlled studies [3,4] suggested no necessity to routine steroid administration, but the number of the studies subjects was small. Analysis using big data has not been performed. Therefore, this study examined the relationship between perioperative steroid administration and complications using a nationwide Diagnosis Procedure Combination database in Japan.


    Method: We performed a retrospective study on patients who had undergone pituitary surgery (excluding meningiomas, Cushing’s disease, and preoperative steroid administration) between July 2010 and March 2016. To this end, a nationwide inpatient database in Japan was used, and the patients were divided into a prophylactic steroid-administered group and a nonadministered group. Patients’ complications, including hypopituitarism, diabetes insipidus, meningitis, hyponatremia, and hypokalemia, and discharge status were examined by inverse probability of treatment weighting using propensity score.


    Result: A total of 7,725 inpatients received prophylactic steroids, whereas 864 did not. The inverse probability of treatment weighting using propensity score revealed that the incidence of hypopituitarism and diabetes insipidus was significantly higher in the prophylactic steroid group than in the nonsteroid group (3.5% vs. 0.5%, P 0.001 and 9.6% vs. 6.0%, P = 0.001, respectively). There were no significant differences in the incidences of meningitis, electrolyte abnormalities, and length of hospital stay.


    This study using big data suggests that prophylactic steroid administration may not be necessary in patients with an intact adrenocortical function undergoing transsphenoidal pituitary surgery.


    1. Fleseriu M, et al. J Clin Endocrinol Metab. 101:3888–3921 (2016)


    2. Tohti M, et al. PLoS One 10: e0119621 (2015)


    3. Sterl K, et al. Neurosurgery 85: E226-e232 (2019)4. Lee HC, et al. Neurosurg (2020, in press)

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  • Identification of novel C-terminally truncated estrogen receptor β variant transcripts and their distribution in humans. 査読

    Hirotaka Ishii, Yujiro Hattori, Hitoshi Ozawa

    Journal of Nippon Medical School = Nippon Ika Daigaku zasshi   88 ( 1 )   54 - 62   2020年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    BACKGROUND: The nuclear receptor genes, including estrogen receptor β (ERβ), contain non-conventional internal and terminal exons, and alternative choice of the exons yields multiple mRNA and protein variants with unique structures and functions. However, the genomic structure of the intronic and 3'-downstream regions of the human ERβ gene and the presence of novel ERβ variants with non-conventional sequences have not been re-examined for approximately two decades. Therefore, we attempted to re-characterize the structure of the human ERβ gene and identify novel non-conventional exons and distinct splice variants. METHODS: Rapid amplification of cDNA 3'-end and RT-PCR cloning were performed to isolate human ERβ mRNA variants from the testis. The identified cDNA sequences were mapped on the human genome assembly. Expression profiles of the variants were assessed by RT-PCR analysis. RESULTS: We cloned multiple ERβ mRNA variants with novel nucleotide sequences from the testis and identified several alternative splice sites, 3'-elongation of conventional coding exons, and novel terminal exons in the human ERβ gene. The variants encode C-terminally truncated ERβ proteins termed ERβ6, ERβ7, ERβEx. 4L, and ERβEx. 6L. Furthermore, we identified the presence of exon 7-defective forms of ERβ2/βcx, ERβ4, ERβ6, and ERβ7. Subsequently, we determined distinct expression patterns of the variants in human peripheral organs and brain subregions. CONCLUSION: This study elucidated the complicated genomic organization and splicing patterns of the human ERβ gene that contribute to the distinct heterogeneity of human ERβ mRNAs and proteins.

    DOI: 10.1272/jnms.JNMS.2021_88-105

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  • Identification of a novel C-terminally truncated estrogen receptor α variant (ERαi34) with constitutive transactivation and estrogen receptor antagonist resistance. 査読 国際誌

    Ishii H, Hattori Y, Ozawa H

    Molecular and cellular endocrinology   503   110693 - 110693   2020年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.mce.2019.110693

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  • Applicability of Anti-Human Estrogen Receptor β Antibody PPZ0506 for the Immunodetection of Rodent Estrogen Receptor β Proteins. 査読 国際誌

    Ishii H, Otsuka M, Kanaya M, Higo S, Hattori Y, Ozawa H

    International journal of molecular sciences   20 ( 24 )   2019年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.3390/ijms20246312

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  • Suprasellar Hemangioblastoma with Reversible Edema-Like Change Along the Optic Tract: A Case Report and Literature Review. 査読 国際誌

    Yujiro Hattori (corresponding), Shigeyuki Tahara, Osamu Yamada, Masahiro Yamaguchi, Eitaro Ishisaka, Akio Morita

    World neurosurgery   114   187 - 193   2018年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    BACKGROUND: Hemangioblastomas usually occur in the cerebellum and are often a component of von Hippel-Lindau disease. Edema-like changes along the optic tract are commonly observed in association with tumors in the sellar and suprasellar regions, such as craniopharyngiomas and pituitary adenomas. Here, we describe a case of sporadic suprasellar hemangioblastoma with edema-like changes along the optic tract that completely resolved after surgery. CASE DESCRIPTION: The patient was a 28-year-old woman with failing vision and a bitemporal hemianopia. Magnetic resonance imaging revealed a tumor accompanied by a 10-mm cyst. Fluid-attenuated inversion recovery axial magnetic resonance imaging revealed a hyperintense region along the optic tract. Other regions of the central nervous system were normal. Endoscopic transsphenoidal surgery was performed, and the histopathologic findings confirmed hemangioblastoma. Six months after surgery, the edema-like change along the optic tract had disappeared. The patient is doing well without pituitary insufficiency, pituitary hormone medications, or signs of tumor recurrence. In addition, the genetic test was negative for von Hippel-Lindau mutations. CONCLUSIONS: When examining a patient with suprasellar tumor, clinicians must consider the possibility of hemangioblastoma. Adequate treatment can improve the edematous change and visual disturbance.

    DOI: 10.1016/j.wneu.2018.03.114

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  • Radiological findings of transorbital penetrating intracranial injury in a child. 査読 国際誌

    Eitaro Ishisaka, Yasuo Murai, Akio Morita, Kazutaka Shirokane, Yujiro Hattori, Eiichi Baba

    Child's nervous system : ChNS : official journal of the International Society for Pediatric Neurosurgery   33 ( 11 )   2061 - 2064   2017年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In penetrating injuries, woods are known to be difficult to detect with radiological imaging studies, because the wood density are known to be extremely close to the value of air on CT. Adjustment of CT window and reconstruction of a 3D image from CT images allowed us to more accurately distinguish wood from air and to find the fragment of the wooden chopstick. It is particularly useful in transorbital penetrating injury.

    DOI: 10.1007/s00381-017-3510-2

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  • New Technique for Chiasmapexy Using Iliac Crest Bone Graft: 2 Cases of Visual Impairment Caused by Empty Sella Syndrome. 査読 国際誌

    Atsushi Tsukiyama, Yujiro Hattori (co-first author, and corresponding), Shigeyuki Tahara, Eitaro Ishisaka, Daijiro Morimoto, Kenichi Oyama, Akira Teramoto, Akio Morita

    World neurosurgery   107   1051.e19-1051.e25 - 1051.e25   2017年11月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    BACKGROUND: Chiasmapexy is used to treat empty sella syndrome, and various materials are used for the elevation of the optic chiasm. However, the use of artificial substances may have the risk of graft infection, and fat and muscle may be absorbed over the long term after surgery. In addition, bone and cartilage may be unavailable in adequate amounts. Here, we describe a new technique for chiasmapexy using an iliac crest bone graft. CASE DESCRIPTION: The first patient was a 71-year-old woman who had undergone transsphenoidal surgery twice for the treatment of pituitary adenoma and Rathke cleft cyst. The optic chiasm collapsed after the second surgery and her visual field worsened gradually. We performed chiasmapexy using fat, fascia, and a septal mucosal flap, but the optic chiasm did not remain in the normal position because of graft shrinkage. Finally, we used an iliac crest bone graft, which resulted in good visual function. The second patient was a 58-year-old man who was incidentally diagnosed with empty sella syndrome. The patient's bitemporal hemianopia gradually progressed. As in the first case, we used an iliac crest bone graft, which halted the deterioration of visual function after chiasmapexy. CONCLUSIONS: The advantages of iliac bone are that it is less likely to absorb and become infected than synthetic materials. This method may be suitable for reoperative cases, especially those wherein the septal cartilage has been removed in a previous surgery. This method will halt visual deterioration and may be one of the considerable options for chiasmapexy operations.

    DOI: 10.1016/j.wneu.2017.08.080

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  • Characterization of rodent constitutively active estrogen receptor α variants and their constitutive transactivation mechanisms. 査読 国際誌

    Ishii H, Hattori Y, Munetomo A, Watanabe H, Sakuma Y, Ozawa H

    General and comparative endocrinology   248   16 - 26   2017年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.ygcen.2017.04.009

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  • Human C-terminally truncated ERα variants resulting from the use of alternative exons in the ligand-binding domain. 査読 国際誌

    Hattori Y, Ishii H, Munetomo A, Watanabe H, Morita A, Sakuma Y, Ozawa H

    Molecular and cellular endocrinology   425   111 - 22   2016年4月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.mce.2016.01.026

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  • Characterization of the fundamental properties of the N-terminal truncation (Δ exon 1) variant of estrogen receptor α in the rat. 査読 国際誌

    Hattori Y, Ishii H, Morita A, Sakuma Y, Ozawa H

    Gene   571 ( 1 )   117 - 25   2015年10月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.gene.2015.06.086

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  • Fascia patchwork closure for endoscopic endonasal skull base surgery. 査読 国際誌

    Yudo Ishii, Shigeyuki Tahara, Yujiro Hattori, Akira Teramoto, Akio Morita, Akira Matsuno

    Neurosurgical review   38 ( 3 )   551 - 6   2015年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    With the development of endoscopic technology and surgery, resection of midline skull base tumors has been achieved using endoscopic endonasal skull base (EESB) approaches. EESB approaches reportedly have a greater risk of postoperative cerebrospinal fluid (CSF) leakage. Recently, the introduction of the nasoseptal flap (NSF) decreased dramatically the incidence of CSF leakage, but the use of an NSF increases the risk of disturbing the function of the nose. Here, we report our new technique called "fascia patchwork closure" for closure after EESB surgery and its outcome. All 48 cases involved midline skull base tumors resected via EESB approaches. Of them, 32 cases were closed by the fascia patchwork technique after tumor resection, and there was no incidence of CSF leakage. Moreover, 6 of the 32 cases were closed without the use of an NSF, indicating that the fascia patchwork closure approach is effective as part of a multilayer closure for the prevention of CSF leakage. The establishment and popularization of this technique might result in the further development of EESB surgery and also an improvement of postoperative nasal function.

    DOI: 10.1007/s10143-015-0614-6

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  • Sellar Chondroma with Endocrine Dysfunction that Resolved after Surgery: Case Report. 査読

    Yujiro Hattori (corresponding), Shigeyuki Tahara, Takuya Nakakuki, Mao Takei, Yudo Ishii, Akira Teramoto, Akio Morita

    Journal of Nippon Medical School = Nippon Ika Daigaku zasshi   82 ( 3 )   146 - 50   2015年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Chondromas originating from the sella turcica are rare, and the most common initial symptoms are headache and visual disturbance. We describe a case of sellar chondroma with endocrine impairment as an initial manifestation that completely resolved after surgery. A 40-year-old Japanese woman with amenorrhea and galactorrhea for the last 2 years was referred to our department of neurosurgery for the evaluation of high prolactin levels and a tumor in the sella turcica. A biochemical assessment indicated endocrine dysfunction. Magnetic resonance imaging and computed tomography indicated a tumor in the sella turcica. The patient's presentation favored the preoperative diagnosis of pituitary adenoma or Rathke's cleft cyst. However, because calcification was detected, other types of tumors, such as craniopharyngioma, meningioma, and chordoma, were also considered. Endoscopic transsphenoidal surgery was performed, and the possibility of a bony tumor was recognized. Finally, the tumor was completely removed, and the histopathological findings confirmed chondroma. The postoperative course was uneventful, and endocrine function improved. Five years after surgery, the patient is doing well without pituitary insufficiency, pituitary hormone medications, or signs of tumor recurrence. In cases of sellar chondroma, endocrine dysfunction sometimes precedes other symptoms, such as headache and visual disturbance. When examining a patient with an intrasellar tumor harboring calcification, clinicians must consider the possibility of sellar chondroma. Furthermore, to the best of our knowledge, this case is the first of sellar chondroma treated with endoscopic surgery to be reported.

    DOI: 10.1272/jnms.82.146

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  • Primary ciliary dyskinesia diagnosed on nasal mucosal biopsy in two newborns. 査読 国際誌

    Jun Yasuhara, Yuji Yamada, Kaori Hara, Rieko Suhara, Yujiro Hattori, Tetsuji Yamaguchi, Yusuke Mizuno, Rika Kizu, Masahiro Bamba

    Pediatrics international : official journal of the Japan Pediatric Society   56 ( 2 )   258 - 61   2014年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Primary ciliary dyskinesia (PCD) is a genetic disease that causes abnormalities in ciliary structure and/or function. Ciliated cells line the upper and lower respiratory tracts and the Eustachian tube. Impairment of mucus clearance at these sites leads to sinusitis, repeated pulmonary infections, bronchiectasis, and chronic otitis media. Situs inversus occurs randomly in approximately 50% of subjects with PCD. The triad of situs inversus, bronchiectasis and sinusitis is known as Kartagener syndrome. PCD is usually an autosomal recessive disease, but occasional instances of X-linked transmission have been reported. Specific diagnosis requires examination of ciliary function or structure on light and electron microscopy. Early diagnosis and respiratory management are important in order to prevent the development of bronchiectasis and deterioration in lung function. We report early diagnosis of PCD on nasal mucosal biopsy in two newborns who presented with prolonged respiratory distress and rhinorrhea.

    DOI: 10.1111/ped.12268

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  • A case of prolactinoma with chordoma. 査読 国際誌

    Yujiro Hattori (corresponding), Shigeyuki Tahara, Yudo Ishii, Takayuki Kitamura, Chie Inomoto, Robert Yoshiyuki Osamura, Akira Teramoto, Akio Morita

    Clinical neurology and neurosurgery   115 ( 12 )   2537 - 9   2013年12月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.clineuro.2013.09.010

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  • Pediatric mumps with laryngeal edema. 査読 国際誌

    Yujiro Hattori, Yasufumi Oi, Ryo Matsuoka, Yumi Daimon, Asami Ito, Wataru Kubota, Kyoko Konishi, Toshimi Onguchi, Akihiro Sato, Yukio Yamashita, Jun Ishihara

    Pediatric emergency care   29 ( 10 )   1104 - 6   2013年10月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Mumps virus infection primarily affects the salivary glands and may incur various complications. Laryngeal edema is such a rare complication that few adult cases have been reported. We report the first known pediatric patient with mumps with laryngeal edema. An 8-year-old boy developed dyspnea after a rapidly progressive swelling of his face and neck. Laryngoscopy revealed edematous changes in the supraglottic and subglottic regions, and computed tomography confirmed significant laryngeal edema in addition to swelling of the cervical soft tissue and the salivary glands. Laboratory findings revealed a high serum amylase level and confirmed the diagnosis of mumps. Intravenous steroid administration alleviated the dyspnea, although the patient required temporary tracheal intubation to maintain airway patency. He did not need tracheotomy and did not experience any other complications. Laryngeal edema must be regarded as a rare, potentially life-threatening complication of mumps. When mumps is diagnosed with significant swelling of the neck, an emergency airway should be established to prevent airway obstruction.

    DOI: 10.1097/PEC.0b013e3182a60049

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  • A case of IgG4-related hypophysitis without pituitary insufficiency. 査読 国際誌

    Yujiro Hattori (corresponding), Shigeyuki Tahara, Yudo Ishii, Takayuki Kitamura, Chie Inomoto, Robert Yoshiyuki Osamura, Akira Teramoto, Akio Morita

    The Journal of clinical endocrinology and metabolism   98 ( 5 )   1808 - 11   2013年5月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    CONTEXT: IgG4-related hypophysitis is a novel clinical disease entity, which is typically complicated by hypopituitarism. OBJECTIVE: The objective of the study was to describe a novel case of IgG4-related hypophysitis without pituitary insufficiency and summarize the current relevant literature. PATIENT AND METHODS: A 55-year-old Japanese man presented with an enlarged pituitary gland and bitemporal hemianopsia. Endocrine studies revealed normal pituitary function, although his serum IgG4 level was high. The patient underwent a transsphenoidal biopsy of the pituitary gland, and the pathological tissues were consistent with IgG4-related hypophysitis. Oral prednisolone therapy was started, and after 6 months, his serum IgG4 level decreased and visual field improved. CONCLUSION: We described the first case of IgG4-related hypophysitis without pituitary insufficiency. However, further case collection is needed to characterize the pathophysiology of IgG4-related hypophysitis.

    DOI: 10.1210/jc.2013-1088

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  • Identification of a neuron-specific human gene, KIAA1110, that is a guanine nucleotide exchange factor for ARF1. 査読 国際誌

    Yujiro Hattori, Shigeki Ohta, Kenji Hamada, Hisafumi Yamada-Okabe, Yonehiro Kanemura, Yumi Matsuzaki, Hideyuki Okano, Yutaka Kawakami, Masahiro Toda

    Biochemical and biophysical research communications   364 ( 4 )   737 - 42   2007年12月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    To identify neuron-specific genes, we performed gene expression profiling, cDNA microarray and in silico ESTs (expressed sequence tags) analyses. We identified a human neuron-specific gene, KIAA1110 (homologue of rat synArfGEF (Po)), that is a member of the guanine nucleotide exchange factor (GEF) for the ADP-ribosylation factor (ARF). RT-PCR analysis showed that the KIAA1110 gene was expressed specifically in the brain among adult human tissues, whereas no apparent expression was observed in immature neural tissues/cells, such as fetal brain, glioma tissues/cells, and neural stem/precursor cells (NSPCs). The KIAA1110 protein was shown to be expressed in mature neurons but not in undifferentiated NSPCs. Immunohistochemical analysis also showed that KIAA1110 was expressed in neurons of the human adult cerebral cortex. Furthermore, the pull-down assay revealed that KIAA1110 has a GEF activity toward ARF1 that regulates transport along the secretion pathway. These results suggest that KIAA1110 is expressed specifically in mature neurons and may play an important role in the secretion pathway as a GEF for ARF1.

    DOI: 10.1016/j.bbrc.2007.10.041

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  • Identification of a neural specific gene by microarray and EST database analysis 査読

    Yujiro Hattori, Shigeki Ohta, Kenji Hamada, Naofumi Yamada-Okabe, Yonehiro Kanemura, Hideyuki Okano, Yutaka Kawakami, Masahiro Toda

    NEUROSCIENCE RESEARCH   55   S104 - S104   2006年

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    担当区分:筆頭著者   記述言語:英語   出版者・発行元:ELSEVIER IRELAND LTD  

    Web of Science

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書籍等出版物

  • ブレインナーシング 2023年1号 <特集>手術動画つき 必要な術後看護がみえてくる 脳神経外科の手術(第39巻1号)

    服部裕次郎, 田原重志( 担当: 分担執筆 範囲: ①解剖生理と機能局在 06視床, 07視床下部・下垂体, 08脳幹, 09脳神経)

    メディカ出版  2022年12月  ( ISBN:4840479291

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    総ページ数:192  

    ASIN

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  • 糖尿病・内分泌代謝科

    鈴木幸二, 田原重志, 服部裕次郎, 寺本紳一郎, 森田明夫( 担当: 分担執筆 範囲: 年齢を考慮した非機能性下垂体腺腫のマネージメント)

    科学評論社  2022年9月 

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  • 内分泌画像検査診断マニュアル 改訂第2版

    服部裕次郎, 田原重志( 担当: 分担執筆 範囲: 【Ⅱ各論編 第2章 視床下部・下垂体疾患】傍鞍部腫瘍)

    診断と治療社  2020年12月 

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  • 内分泌・糖尿病・代謝内科

    服部裕次郎, 田原重志( 担当: 分担執筆 範囲: 【機能性内分泌疾患に対する外科治療と内科治療】クッシング病 外科治療)

    科学評論社  2017年11月 

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  • Clinical Neuroscience

    服部裕次郎, 田原重志( 担当: 分担執筆 範囲: 【視床下部と下垂体-神経内分泌の最新情報】 内分泌機能障害の診断と治療 SIADH(SIAD))

    2017年4月 

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  • 脳神経外科研修診療心得

    服部裕次郎( 担当: 分担執筆 範囲: Ⅲ章 脳腫瘍 下垂体腫瘍)

    メジカルビュー社  2014年10月 

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MISC

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受賞

  • 第25回日本組織細胞化学会論文賞

    2023年  

    小澤実那, 服部裕次郎(共同筆頭著者), 肥後心平, 大塚真衣, 松本恵介, 小澤一史, 石井寛高

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  • 日本医科大学准教授講師会 若手研究奨励賞

    2022年  

    服部 裕次郎

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  • 第31回日本間脳下垂体腫瘍学会 研究奨励賞

    2021年  

    服部 裕次郎

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  • 第28回臨床内分泌代謝Update 優秀ポスター賞

    2018年  

    服部 裕次郎

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  • 平成29年度日本医科大学同窓会医学研究助成

    2017年  

    服部 裕次郎

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  • 第42回日本神経内分泌学会学術集会 トラベルグラント

    2015年  

    服部 裕次郎

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  • 第24回臨床内分泌代謝Update 優秀ポスター賞

    2014年  

    服部 裕次郎

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  • 第40回日本神経内分泌学会学術集会 トラベルアワード

    2013年  

    服部 裕次郎

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  • 一般財団法人 山田長満奨学金

    2013年  

    服部 裕次郎

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  • 第8回アクロメガリーフォーラム 奨励賞

    2012年  

    服部 裕次郎

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共同研究・競争的資金等の研究課題

  • 新WHO分類における下垂体神経内分泌腫瘍の悪性度に関与する因子の探索

    研究課題/領域番号:23K07977  2023年4月 - 2026年3月

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    田原 重志, 服部 裕次郎

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    配分額:4810000円 ( 直接経費:3700000円 、 間接経費:1110000円 )

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  • 内視鏡下経鼻的手術における硬膜縫合のための安価かつ簡便な練習機の開発

    2023年1月 - 2023年12月

    公益財団法人 内視鏡医学研究振興財団  2022年度研究助成B 

    服部裕次郎, 田原重志

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    担当区分:研究代表者 

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  • プロラクチン産生下垂体腺腫における腫瘍発生・増殖を担う新規遺伝子の同定

    2020年4月 - 2023年3月

    日本学術振興会  科学研究費助成事業 若手研究 

    服部裕次郎

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    担当区分:研究代表者 

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  • ESR1アイソフォームによるエストロゲン感受性腫瘍の内分泌・化学療法耐性獲得機構

    研究課題/領域番号:18K06879  2018年4月 - 2022年3月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    石井 寛高, 服部 裕次郎

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    担当区分:研究分担者 

    配分額:4160000円 ( 直接経費:3200000円 、 間接経費:960000円 )

    本研究では、エストロゲン受容体α(estrogen receptor α, ERα; ESR1)アイソフォームが、エストロゲン感受性腫瘍の悪性化に伴う内分泌・化学療法耐性獲得に関与するか検討を行うことを目的としている。ESR1アイソフォームの中で特にC末端欠損型ESR1変異体は恒常的転写活性化能とERアンタゴニスト耐性を保持するため、エストロゲン感受性腫瘍の内分泌・化学療法耐性獲得に寄与する最有力候補分子である。そのため、ESR1アイソフォームとしてC末端欠損型ESR1変異体を研究対象として研究を遂行している。当該年度は、C末端欠損型ESR1変異体の再解析と変異体の構造-転写活性化連関を解析した。
    C末端欠損型ESR1変異体の再解析により、乳がん由来細胞株から従来の1-2-3-4-cryptic exon型とは異なる1-2-3-cryptic exon型のC末端欠損型ESR1変異体を新規に同定し、その変異体がより強い恒常的転写活性化を示すことを見出した。この変異体遺伝子を乳がん由来培養細胞株であるMCF-7に導入し、変異体を安定に発現する細胞株を樹立した。安定発現細胞株を用いて細胞増殖能を解析したところ、変異体発現細胞株は変異体非発現細胞株と比較し、恒常的に細胞増殖能が亢進しており、その増殖能亢進はERアンタゴニストであるフルベストランに対して耐性を示した。
    また、人為的に作成した多種類のESR1コンストラクトを用いてエストロゲンの古典的および非古典的作用経路を解析した。この解析を通してC末端欠損型ESR1変異体の構造-転写活性化連関を解明するとともに、C末端欠損型ESR1変異体がエストロゲンの古典的経路だけでなく、非古典的経路を恒常的に活性化すること、さらに、全長型ESR1とは転写活性化プロファイルが異なることが判明した。

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  • 環境情報入力との連関を基盤とする新規生殖機能制御系に関する分子機能形態学的解析

    研究課題/領域番号:18K06860  2018年4月 - 2021年3月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    小澤 一史, 岩田 衣世, 金谷 萌子, 石井 寛高, 服部 裕次郎, 肥後 心平, 渡辺 雄貴

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    担当区分:研究分担者 

    配分額:4420000円 ( 直接経費:3400000円 、 間接経費:1020000円 )

    本研究は生殖制御に関して新規に見出されたKisspeptinとその含有ニューロンを統合中枢とする新たな生殖機能制御システムを基盤として、様々な内外の生殖機能に影響に影響を与えるであろうと考えられる因子の変動と、Kisspeptin-GnRH-LH/FSH-Sex steroids軸の変動に関して、免疫組織化学法やin situ hybridization法、免疫電子顕微鏡法等の組織化学的携帯研究法やRadioimmunoasssayなどの生理学的研究手法、遺伝子解析などの分子生物学的研究手法を組み合わせて解析することを目的としている。
    今年度は主にKisspeptin受容体(GPR54)の脳内発現の検索、性差によるkisspeptin受容体の発現変化、代謝エネルギー制御とkisspetin-HPG軸の変動に関して、estrogen受容体α(ERα)のvariant探査等においての研究が進展している。Kisspeptin受容体(GPR54)の脳内発現の検索、性差によるkisspeptin受容体の発現変化に関しては高感度検出i situ hybridization法(RNAscope)の研究応用を確認し、脳全体のkisspetpin受容体発現の再確認、性差や雌における卵巣周期に伴う変動などを明らかにした。また、ERαの新たな変異体の発見とその機能に関しての研究も進んでおり、現在、論文化を進めている。代謝エネルギーと生殖制御システムの相関性に関しては、成長ホルモン欠損ラットにおけるkisspeptin-HPG軸の解析が進行中であり、またSTZを用いて作成する糖尿病モデルラットにおけるKisspeptin-HPG軸の機能形態学的解析が進行中である。さらにPCOS(多嚢胞性卵胞症候群)との関連に関して、妊娠中母体の栄養が児(雌)の生殖機能とPCOSの発現率に関する研究を開始している。

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  • ホルモン感受性腫瘍におけるエストロゲン受容体変異体の発現プロファイルの同定

    研究課題/領域番号:17K16171  2017年4月 - 2020年3月

    日本学術振興会  科学研究費助成事業 若手研究(B)  若手研究(B)

    服部 裕次郎

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    担当区分:研究代表者 

    配分額:3900000円 ( 直接経費:3000000円 、 間接経費:900000円 )

    これまでに申請者らは、恒常的活性化能をもつ新規ヒトエストロゲン受容体(ER)α変異体を多数発見した。これら変異体は恒常的活性化能とともにERアンタゴニスト耐性を有するため、ホルモン感受性腫瘍におけるホルモン非依存的増悪と薬剤耐性獲得に関与することが示唆される。しかし、それら腫瘍における発現・機能解析は未解決であり、本研究では分子生物学的手法を用いその解明を行うとともに、病態組織におけるERα変異体発現の定量系を確立し、ホルモン感受性腫瘍の発現プロファイルの同定を目的とする。本研究では、日本医科大学付属病院の手術で得られた下垂体腫瘍を用いて実施することとした。なお、手術前に、手術検体の一部を医学研究に用いる場合があることを文書・口頭にて原則全患者に説明しており、同意書は文書で取得している。また、本学倫理委員会に必要な手
    続きを取り、十分な法的、倫理規定に則った。
    下垂体腫瘍の手術検体からtotal RNAを抽出し、逆転写反応を行いcDNAを合成しデジタルPCR法を用いて遺伝子発現量を定量した。平成29年度はまずその定量系の確立を行った。それに引き続き平成30年度は確立した定量系を用いて、複数の種類の下垂体腫瘍におけるERα野生型、ERα変異体などの遺伝子発現量を調べ、腫瘍の種類による発現量の差を比較した。前立腺癌におけるアンドロゲン受容体変異体の発現などと異なり、下垂体においては腫瘍の種類に関わらず、ERα変異体の発現は腫瘍組織ではほとんど認められないという結果を得た。一方、下垂体腫瘍のうち、プロラクチン産生下垂体腺腫や非機能性腺腫において全長型ERαの発現が高い群を認めた。おおむね下垂体腫瘍におけるERα変異体の発現プロファイルを明らかにできたものと考えている。

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  • ヒトエストロゲン受容体変異体の機能と発現調節機構の解明

    2014年4月 - 2015年3月

    日本イーライリリー株式会社  2014年度教育・研究助成金 

    服部裕次郎

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    担当区分:研究代表者 

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担当経験のある授業科目

  • 形態機能学

    機関名:日本医科大学看護専門学校

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  • 脳神経外科学(病棟実習)

    機関名:日本医科大学

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  • 肉眼解剖学(講義・実習)

    機関名:日本医科大学

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  • 神経解剖学(講義・実習)

    機関名:日本医科大学

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社会貢献活動

  • 日本救急医学会認定ICLSインストラクター

    役割:講師

    2007年4月 - 2018年1月

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    種別:セミナー・ワークショップ

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