Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：{MDPI} {AG}  

The signaling lymphocytic activation molecule (SLAM) family receptors are expressed on various immune cells and malignant plasma cells in multiple myeloma (MM) patients. In immune cells, most SLAM family molecules bind to themselves to transmit co-stimulatory signals through the recruiting adaptor proteins SLAM-associated protein (SAP) or Ewing’s sarcoma-associated transcript 2 (EAT-2), which target immunoreceptor tyrosine-based switch motifs in the cytoplasmic regions of the receptors. Notably, SLAMF2, SLAMF3, SLAMF6, and SLAMF7 are strongly and constitutively expressed on MM cells that do not express the adaptor proteins SAP and EAT-2. This review summarizes recent studies on the expression and biological functions of SLAM family receptors during the malignant progression of MM and the resulting preclinical and clinical research involving four SLAM family receptors. A better understanding of the relationship between SLAM family receptors and MM disease progression may lead to the development of novel immunotherapies for relapse prevention.

DOI： 10.3390/cancers13020279

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

The signaling lymphocytic activation molecule family 3 (SLAMF3) is highly expressed on plasma cells from patients with multiple myeloma (MM) and induces high malignant potential by ERK signaling mediated via the interaction with adaptor proteins SHP2 and GRB2. This study focused on the single-nucleotide polymorphism (SNP) of the SLAMF3 gene (rs509749, 1804A>G, M602V) in MM. The SNP G allele was a major type, and the frequencies of the GG, GA, and AA genotypes were 61.8%, 29.4%, and 8.8%, respectively, in patients with MM, which was almost the same as in healthy the control group in the Japanese population. Interestingly, patients with GG genotypes had significantly shorter overall survival times than patients with GA/AA genotypes. Consistent with those results, SLAMF3-overexpressing KMS-34 cells with the G allele (V602) had higher cell proliferation potential and were more resistant to anti-MM agents than those with the A allele (M602). When those cells were subcutaneously inoculated into NOG mice, tumor sizes in mice receiving V602 cells rapidly increased, and survival was significantly shorter than in mice injected with M602 cells. Furthermore, SLAMF3 V602 molecules bound more tightly to SHP2 and GRB2, with increased SHP2 and ERK phosphorylation compared with M602 cells. The mRNA expression of cell cycle-related genes (CCND1 and CCNE1) and anti-apoptotic genes (BCL2L and p21) was increased in V602 cells compared with M602 cells. The results thus suggested that the G allele of SLAMF3 SNP rs509749 may be associated with MM disease progression.

DOI： 10.1016/j.exphem.2020.08.006

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PD-L1 expressed on tumor cells contributes to disease progression with evasion from tumor immunity. Plasma cells from multiple myeloma (MM) patients expressed higher levels of PD-L1 compared with healthy volunteers and monoclonal gammopathy of undetermined significance (MGUS) patients, and its expression is significantly upregulated in relapsed/refractory patients. Furthermore, high PD-L1 expression is induced by the myeloma microenvironment and PD-L1+ patients with MGUS and asymptomatic MM tend to show disease progression. PD-L1 expression on myeloma cells was associated with more proliferative potential and resistance to antimyeloma agents because of activation of the Akt pathway through PD-1-bound PD-L1 in MM cells. Those data suggest that PD-L1 plays a crucial role in the disease progression of MM.

DOI： 10.3390/cancers12040924

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Association for Cancer Research (AACR)  

The signaling lymphocytic activation molecule family 3 (SLAMF3) is a member of the immunoglobulin superfamily expressed on T, B, and natural killer cells and modulates the activation and cytotoxicity of these cells. SLAMF3 is also expressed on plasma cells from patients with multiple myeloma (MM), although its role in MM pathogenesis remains unclear. This study found that SLAMF3 is highly and constitutively expressed on MM cells regardless of disease stage and that SLAMF3 knockdown/knockout suppresses proliferative potential and increases drug-induced apoptosis with decreased levels of phosphorylated ERK protein in MM cells. SLAMF3-overexpressing MM cells promote aggressive myeloma behavior in comparison with cytoplasmic domain-truncated SLAMF3 (ΔSLAMF3) cells. SLAMF3 interacts directly with adaptor proteins SH2 domain-containing phosphatase 2 (SHP2) and growth factor receptor bound 2 (GRB2), which also interact with each other. SLAMF3 knockdown, knockout, ΔSLAMF3, and SHP2 inhibitor-treated MM cells decreased phosphorylated ERK protein levels. Finally, serum soluble SLAMF3 (sSLAMF3) levels were markedly increased in advanced MM. Patients with high levels of sSLAMF3 progressed to the advanced stage significantly more often and had shorter progression-free survival times than those with low levels. This study revealed that SLAMF3 molecules consistently expressed on MM cells transmit MAPK/ERK signals mediated via the complex of SHP2 and GRB2 by self-ligand interaction between MM cells and induce a high malignant potential in MM. Furthermore, high levels of serum sSLAMF3 may reflect MM disease progression and be a useful prognostic factor. IMPLICATIONS: SLAMF3 may be a new therapeutic target for immunotherapy and novel agents such as small-molecule inhibitors.

DOI： 10.1158/1541-7786.mcr-19-0391

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

Despite therapeutic advances over the past decades, multiple myeloma (MM) remains a largely incurable disease with poor prognosis in high-risk patients, and thus new treatment strategies are needed to achieve treatment breakthroughs. MM represents various forms of impaired immune surveillance characterized by not only disrupted antibody production but also immune dysfunction of T, natural killer cells, and dendritic cells, although immunotherapeutic interventions such as allogeneic stem-cell transplantation and dendritic cell-based tumor vaccines were reported to prolong survival in limited populations of MM patients. Recently, epoch-making immunotherapies, i.e., immunomodulatory drug-intensified monoclonal antibodies, such as daratumumab combined with lenalidomide and chimeric antigen receptor T-cell therapy targeting B-cell maturation antigen, have been developed, and was shown to improve prognosis even in advanced-stage MM patients. Clinical trials using other antibody-based treatments, such as antibody drug-conjugate and bispecific antigen-directed CD3 T-cell engager targeting, are ongoing. The manipulation of anergic T-cells by checkpoint inhibitors, including an anti-T-cell immunoglobulin and ITIM domains (TIGIT) antibody, also has the potential to prolong survival times. Those new treatments or their combination will improve prognosis and possibly point toward a cure for MM.

DOI： 10.3390/cancers11122009

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Impact Journals, LLC  

The signaling lymphocytic activation molecule family (SLAMF7; also known as CS1 or CD319) is highly expressed on plasma cells from multiple myeloma (MM) as well as natural killer (NK) cells and is a well-known therapeutic target of elotuzumab. The objective of this study was to evaluate the clinical significance of serum soluble SLAMF7 (sSLAMF7) levels in patients with MM (n=103) and furthermore the impact of sSLMF7 on the antitumor activity of anti-SLAMF7 antibody. Thirty-one percent of MM patients, but not patients with monoclonal gammopathy of undetermined significance and healthy controls, had detectable levels of serum sSLAMF7, which were significantly increased in advanced MM patients. Further, MM in sSLAMF7-postive patients exhibited aggressive clinical characteristics with shorter progression-free survival times in comparison with sSLAMF7-negative patients. In responders to MM therapy, the levels of sSLAMF7 were undetectable or decreased compared with those before treatment. In addition, the anti-SLAMF7 antibody-mediated antibody-dependent cellular cytotoxicity of NK cells against MM cell lines was inhibited by recombinant SLAMF7 protein. Thus, our findings suggest that high concentrations of sSLAMF7, which could transiently suppress the therapeutic effects of elotuzumab, may be a useful indicator of disease progression in MM patients.

DOI： 10.18632/oncotarget.26196

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer-Verlag Wien  

We found a HLA class II histocompatibility antigen gene, DQ alpha 1 chain (HLA-DQA1), that was expressed more than 9-fold higher in high-load hepatitis C virus (HCV) livers than low-load HCV livers using transcriptomics of chronic HCV-infected livers. To further investigate this finding, we examined which cells were positive for HLA-DQA1 and what liver immune responses were different between HCV-high and -low livers. HLA-DQA1-positive cells were significantly increased in the HCV-high group, and most positive cells were identified as non-parenchymal sinusoid cells and lymphocytic infiltrates in the portal area. Parenchymal hepatocytes were negative for HLA-DQA1. HLA-DQA1-positive cells in the liver sinusoid were positive for CD68 (macrophages or Kupffer cells)
those in the lymphocytic infiltrates were positive for CD20 (B cells) or CD3 (T cells). mRNA levels of antigen-presenting cell (APC) markers such as CD68 and CD11c were significantly upregulated in the HCV-high group and were correlated with HLA-DQA mRNA levels. CD8B mRNA (CD8+ T cells) was upregulated in both HCV-positive livers compared with HCV-negative livers, whereas CD154 mRNA (CD4+ T helper cell) was upregulated in the HCV-high group compared with the HCV-low group. The immune regulatory molecules FOXP3 mRNA (regulatory T cell, T reg) and programmed cell death ligand-1 (PD-L1) mRNA were significantly increased in the HCV-high group. HCV-high livers had two molecular immune responses: increased APC numbers and adaptive immunity and the induction of immune tolerance. The local hepatic imbalance of contradictory immune responses might be responsible for high HCV loads.

DOI： 10.1007/s00705-017-3675-8

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Other Link： http://link.springer.com/content/pdf/10.1007/s00705-017-3675-8.pdf

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T-cell immunoglobulin mucin-3 (Tim-3), an inhibitory immune checkpoint receptor, is highly expressed on acute myeloid leukemia cells and its ligand galectin-9 is reported to drive leukemic progression by binding with Tim-3. However, it remains unclear whether the Tim-3-galectin-9 pathway is associated with the pathophysiology of myelodysplastic syndromes (MDS). Thus, we investigated the expression and function of Tim-3 and the clinical impact of its ligand galectin-9 in MDS. Tim-3 expression levels on MDS blasts by CD45/side-scatter or CD34/CD45 gating were increased as MDS progressed to the advanced stage. Tim-3 expression in the MDS blasts was upregulated in the presence of the cell culture supernatant of human stromal cells or the MDS-related cytokine transforming growth factor-β1. The proliferation of Tim-3+ MDS blasts was inhibited by the blockade of anti-Tim-3 antibody. Furthermore, plasma levels of galectin-9 were elevated as MDS progressed to the advanced stage in 70 MDS/acute leukemia transformed from MDS patients and was a prognostic factor in 40 MDS patients. Our data demonstrated that the Tim-3- galectin-9 pathway is associated with the pathogenesis and disease progression of MDS. These findings provide new insight into potential immunotherapy targeting the galectin-9-Tim-3 pathway in MDS.

DOI： 10.18632/oncotarget.21492

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER ASSOC CANCER RESEARCH  

B7 homolog 1 (B7-H1)-expressing myeloma cells not only inhibit myeloma-specific cytotoxic T lymphocytes (CTL), but also confer a proliferative advantage: resistance to antimyeloma chemotherapy. However, it remains unknown whether B7-H1 expressed on myeloma cells induces cellular responses associated with aggressive myeloma behaviors. To address this question, we analyzed the proliferation and drug sensitivity of B7-H1-expressing myeloma cells transfected with B7-H1-specific short-hairpin RNA or treated with programmed cell death (PD)-1-Fc-coupled beads. Knockdown of B7-H1 expression in myeloma cells significantly inhibited cell proliferation and increased apoptosis induced by the chemotherapeutic alkylating agent melphalan, with downregulation of the expression of cell cycle-related genes (CCND3 and CDK6) and antiapoptotic genes (BCL2 and MCL1). B7-H1 molecules thus contributed to myeloma cell-cycle progression and suppression of drug-induced apoptosis. B7-H1-expressing myeloma cells had a higher affinity for PD-1 than for CD80. PD-1-Fc bead-treated myeloma cells also became resistant to apoptosis that was induced by melphalan and the proteasome inhibitor bortezomib. Apoptosis resistance was associated with the PI3K/AKT pathway. Both myeloma cell drug resistance and antiapoptotic responses occurred through the PI3K/AKT signaling pathway, initiated from "reverse" stimulation of B7-H1 by PD-1. Therefore, B7-H1 itself may function as an oncogenic protein in myeloma cells. The interaction between B7-H1 on myeloma cells and PD-1 molecules not only inhibits tumor-specific CTLs but also induces drug resistance in myeloma cells through the PI3K/AKT signaling pathway. These observations provide mechanistic insights into potential immunotherapeutic benefits of blocking the B7-H1-PD-1 pathway. (C) 2016 AACR.

DOI： 10.1158/2326-6066.CIR-15-0296

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Society for Clinical Investigation  

Multiple myeloma (MM) is a relapsed and refractory disease, one that highlights the need for developing new molecular therapies for overcoming of drug resistance. Addition of panobinostat, a histone deacetylase (HDAC) inhibitor, to bortezomib and dexamethasone improved progression-free survival (PFS) in relapsed and refractory MM patients. Here, we demonstrate how calcineurin, when inhibited by immunosuppressive drugs like FK506, is involved in myeloma cell growth and targeted by panobinostat. mRNA expression of PPP3CA, a catalytic subunit of calcineurin, was high in advanced patients. Panobinostat degraded PPP3CA, a degradation that should have been induced by inhibition of the chaperone function of heat shock protein 90 (HSP90). Cotreatment with HDAC inhibitors and FK506 led to an enhanced antimyeloma effect with a greater PPP3CA reduction compared with HDAC inhibitors alone both in vitro and in vivo. In addition, this combination treatment efficiently blocked osteoclast formation, which results in osteolytic lesions. The poor response and short PFS duration observed in the bortezomib-containing therapies of patients with high PPP3CA suggested its relevance to bortezomib resistance. Moreover, bortezomib and HDAC inhibitors synergistically suppressed MM cell viability through PPP3CA inhibition. Our findings underscore the usefulness of calcineurin-targeted therapy in MM patients, including patients who are resistant to bortezomib.

DOI： 10.1172/jci.insight.85061

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Language：Japanese   Publishing type：Research paper (scientific journal)  

The NCCN-International Prognostic Index (IPI) is reported to be more powerful than the former IPI for predicting survival in the rituximab era. To evaluate the NCCN-IPI in our institutions, we analyzed 188 patients with diffuse large B-cell lymphoma treated with rituximab plus CHOP or THP-COP chemotherapy. The 5-year overall survival rates of patients with low, low-intermediate, high-intermediate, and high risk were 90%, 76%, 64%, and 34%, respectively. Although there was no difference in overall survival between patients 61-75 and those >75 years of age, the NCCN-IPI is useful for classifying prognostically relevant subgroups of Japanese patients.

DOI： 10.11406/rinketsu.56.915

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：John Wiley and Sons Inc.  

The human liver reacts to hepatitis C virus (HCV) with a balanced response consisting of host anti- and proviral activities. To explore these subtle host responses, we used oligonucleotide microarrays to investigate the differential gene expression between two groups of liver samples with high and low HCV loads (&gt
100-fold difference). We identified and validated 26 genes that were up-regulated in livers with high HCV loads, including transmembrane protease serine 2 (TMPRSS2). Trypsin inhibitors inhibited the infection of Huh7-25-CD81 cells with cell-culture-derived HCV (HCVcc) of Japanese fulminant hepatitis 1 isolate at the postbinding and entry step, and trypsin enhanced HCVcc infection at an early stage of infection. Several major transmembrane serine proteases, in particular, furin and hepsin, were detected in Huh7-25-CD81 cells, but TMPRSS2 was not. Huh7-25-CD81 cell clones stably expressing TMPRSS2- WT (wild type) and inactive TMPRSS2-mutant genes showed positive and negative enhancement of their susceptibility to HCVcc infection, respectively. The enhanced susceptibility of TMPRSS2-WT Huh7-25-CD81 cells was confirmed by knockdown of TMPRSS2 using small interfering RNA. The cell-surface protease activity of TMPRSS2-WT cells was markedly active in the cleavage of QAR and QGR, corresponding to amino acid residues at P3 to P1. Conclusion: The cell-surface activity of a trypsin-like serine protease, such as TMPRSS2, activates HCV infection at the postbinding and entry stage. Host transmembrane serine proteases may be involved in the sensitivity, persistence, and pathogenesis of HCV infection and be possible targets for antiviral therapy.

DOI： 10.1002/hep.27426

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer-Verlag Wien  

C-type lectin domain family 4, member M (CLEC4M), a trans-membrane protein specifically expressed in liver sinusoidal endothelial cells, is considered a candidate receptor for hepatotropism of hepatitis C virus (HCV). CLEC4M was previously reported to capture artificial HCVpp (pseudoparticle) and transmit it to hepatocytes (transinfection) via CLEC4M-positive cells. It is still not known whether CLEC4M acts as a receptor for HCVcc (cell-culture-produced HCV) transinfection or whether CLEC4M is an entry receptor for HCVcc. Initially, we established stably CLEC4M-positive and HCV-replication-permissive cell lines by introducing a CLEC4M expression vector into Huh7-25 cells (Huh7-25-CLEC4M) by transfection. Huh7-25 is a mutant cell line that is resistant to JFH-1 HCVcc due to the lack of expression of CD81 but permissive for replication of JFH1 HCV RNA. When Huh7-25-CLEC4M cells were infected with HCVcc and cultured for 6 days, none were positive for infection. Next, to examine whether CLEC4M functions as a receptor for transinfection, Huh7-25-CLEC4M cells were inoculated with HCVcc and thereafter co-cultured with Huh7-it cells, which are susceptible to HCV infection. The amount of HCV RNA was increased in Huh7-it cells co-cultured with Huh7-25-CLEC4M cells, and the transinfection was inhibited in the presence of anti-CLEC4M antibody during inoculation. Thus, CLEC4M cannot substitute for CD81 as an entry receptor for JFH-1 HCVcc. It just mediates transinfection without internalization of HCVcc. CD81 is still crucial for HCV entry into hepatocytes, and CLEC4M in liver sinusoidal endothelial cells may be responsible for hepatotropism of HCV infection by trapping circulating HCV to transmit it to adjacent hepatocytes.

DOI： 10.1007/s00705-014-2150-z

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Other Link： http://link.springer.com/article/10.1007/s00705-014-2150-z/fulltext.html

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ACADEMIC PRESS INC ELSEVIER SCIENCE  

The level of expression of housekeeping genes is in general considered stable, and a representative gene such as glyceraldehyde-3-phosphate dehydrogenase is commonly used as an internal control for quantitating mRNA. However, expression of housekeeping genes is not always constant under pathological conditions. To determine which genes would be most suitable as internal controls for quantitative gene expression studies in human liver diseases, we quantified 12 representative housekeeping genes in 27 non-cancerous liver tissues (normal, chronic hepatitis C with and without liver cirrhosis). We identified-beta-glucuronidase as the most suitable gene for studies on liver by rigorous statistical analysis of inter- and intra-group comparisons. We conclude that it is important to determine the most appropriate control gene for the particular condition to be analyzed. (c) 2013 Elsevier Inc. All rights reserved.

DOI： 10.1016/j.yexmp.2013.06.005

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

Tumor-associated B7-H1 molecules inhibit antitumor immunity in some malignancies. We found that B7-H1 expression on patient myeloma cells and human myeloma cell lines (HMCLs) was upregulated by cultivating the cells with autologous stromal cells and the human stromal cell line HS-5. Among major cytokines produced by HS-5 cells, interleukin (IL)-6-induced B7-H1 expression on HMCLs. Moreover, HS-5 cell-mediated B7-H1 expression was downregulated by inhibiting IL-6. B7-H1+ HMCLs were more proliferative and less susceptible to antimyeloma chemotherapy compared with B7-H1-HMCLs. Moreover, the former cells showed higher levels of Bcl-2 and FasL expression than the latter. Finally, B7-H1 molecules on HMCLs induced T-cell apoptosis and anergy of tumor-specific T cells. Consistent with these in vitro observations, patients whose myeloma cells expressed high levels of B7-H1 had higher myeloma cell percentages in the bone marrow (BM) and higher serum lactate dehydrogenase levels compared with other myeloma patients. In addition, B7-H1 expression levels were often upregulated after myeloma patients relapsed or became refractory to therapy. Our data indicate that the BM microenvironment upregulates B7-H1 expression on myeloma cells, which links to the two biological actions of inducing T-cell downregulation and enhancing aggressive myeloma-cell characteristics. Modulating the B7-H1 pathway may be worthwhile in myeloma. © 2013 Macmillan Publishers Limited All rights reserved.

DOI： 10.1038/leu.2012.213

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Other Link： http://www.nature.com/articles/leu2012213

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The somatic mutation theory proposing that a sequential accumulation of genetic abnormalities plays a major role in cancer pathogenesis has not yet been confirmed for myelodysplastic syndromes (MDS). Meanwhile, recent data in some cancers has underscored the role of the microenvironment in tumor growth. MDS CD34+CD38- cells usually fail to repopulate after transplantation in mice, suggesting the importance of the microenvironment for MDS cells. Our recent data have provided a disease-progression model in which overproduction of interferon-γ and tumor necrosis factor-α in the microenvironment is the primary event. This causes B7-H1 molecule expression on MDS blasts, which generates a bifunctional signal inducing T-cell apoptosis and enhancing blast proliferation. The latter may provide more opportunity for developing secondary genetic changes. © 2011 Elsevier Ltd.

DOI： 10.1016/j.leukres.2011.06.022

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We found the 2′,5′-oligoadenylate synthetase-like (OASL) gene to be significantly elevated by high virus loads in human liver infected with hepatitis C virus (HCV). Here, we determined whether OASL inhibited HCV replication using an in vitro system. We constructed three expression vectors of OASL to produce isoform a (OASLa), isoform b (OASLb), and the C-terminal ubiquitin-like domain of isoform a (Ub). When Huh7 JFH-1 HCV replicon cells were separately transfected with these three vectors, colony formation of HCV-replicating cells was inhibited by 95%, 94%, and 65%, respectively. Both OASLa and OASLb were also inhibitory for cells as well as the virus because colony formation of OASL-producing cells was reduced to 41% and 8%, respectively. Stable Huh7 clones producing each of the three OASLs were established and assessed for their inhibition of HCV replication using luciferase reporter gene-containing JFH-1 replicon RNA. HCV replication was inhibited by 50-90% in several stable OASL clones. Association analysis in six Ub clones expressing different levels of Ub mRNA showed that the degree of inhibition of HCV replication was significantly associated with the amount of Ub present. In conclusion, OASL possesses two domains with HCV inhibitory activity. The N-terminal OAS-homology domain without OAS activity is inhibitory for cell growth as well as HCV replication, whereas C-terminal Ub is inhibitory only for HCV replication. Therefore, OASLa, a major isoform of this molecule induced in human liver, may mediate anti-HCV activity through two different domains. © 2010 Elsevier Inc. All rights reserved.

DOI： 10.1016/j.bbrc.2010.01.034

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Language：English   Publisher：日本骨髄腫学会  

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DOI： 10.1182/blood-2018-99-112322

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