Updated on 2025/06/26

写真a

 
Sato Hirofumi
 
Affiliation
Faculty of Medicine, Department of Molecular and Medical Genetics, Assistant Professor
Title
Assistant Professor
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Research Interests

  • 感覚受容、感覚情報処理、微小流路、カルシウムイメージング、トランスクリプトーム解析、肝臓、マクロファージ

Research Areas

  • Life Science / Medical biochemistry  / 感覚受容、感覚情報処理、微小流路、カルシウムイメージング、トランスクリプトーム解析、肝臓、マクロファージ

Education

  • The University of Tokyo   Graduate School of Science Doctoral Program

    2013.4 - 2016.3

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  • The University of Tokyo   Graduate School of Science   Department of Biophysics and Biochemistry

    2011.4 - 2013.3

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  • The University of Tokyo   School of Science   Department of Biophysics and Biochemistry

    2009.4 - 2011.3

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Research History

  • Nippon Medical School   Assistant Professor

    2022.4

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  • The University of Tokyo

    2021.6 - 2022.3

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  • The University of Tokyo

    2016.4 - 2021.6

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Papers

  • Proline enhances the hepatic induction of lipogenic gene expression in male hepatic fasn reporter mice. International journal

    Akinori Taniguchi, Hitoshi Watanabe, Kumi Kimura, Emi Hashiuchi, Nami Ohashi, Hirofumi Sato, Mashito Sakai, Michihiro Matsumoto, Shun-Ichiro Asahara, Hiroshi Inoue, Yuka Inaba

    Biochemical and biophysical research communications   747   151314 - 151314   2025.2

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    Hepatic de novo lipogenesis (DNL) is increased by both carbohydrate intake and protein consumption. In hepatic fat synthesis, a key role is played by the induction of the hepatic expression of lipogenic genes, including Fasn, Scd1, and Srebf1. Regarding carbohydrate intake, increased blood glucose and insulin levels promote the expression of hepatic lipogenic genes. However, although amino acids serve as a carbon source for hepatic DNL during protein consumption, their effects on hepatic lipogenic gene expression remain unclear. We investigated the effects of amino acids on hepatic lipogenic gene induction using primary cultured mouse hepatocytes and hepatic Fasn reporter (l-FasnGLuc) mice. In primary cultured hepatocytes, lipogenic gene expression (Fasn, Scd1, Srebf1) was induced under postprandial-mimicking conditions (treatment with insulin and LXR agonist). When hepatocytes were stimulated with an amino acid mixture containing 20 amino acids, the induction of lipogenic gene expression was enhanced, but this effect disappeared when proline was removed from the mixture. Furthermore, when each amino acid was tested individually, only proline potentiated the induction of lipogenic gene expression in hepatocytes under postprandial-mimicking conditions. In mouse liver, continuous proline infusion via osmotic pump increased Fasn gene expression and showed a trend toward increased Srebf1 expression. In l-FasnGLuc mice, continuous proline infusion resulted in sustained enhancement of hepatic Fasn transcription, measured by secreted luciferase activity. These results demonstrate that proline enhances the induction of hepatic lipogenic gene expression both in vitro and in vivo.

    DOI: 10.1016/j.bbrc.2025.151314

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  • Mesenchymal stem cell origin contributes to the antitumor effect of oncolytic virus carriers. International journal

    Makoto Sukegawa, Yoshitaka Miyagawa, Seiji Kuroda, Yoshiyuki Yamazaki, Motoko Yamamoto, Kumi Adachi, Hirofumi Sato, Yuriko Sato, Nobuhiko Taniai, Hiroshi Yoshida, Akihiro Umezawa, Mashito Sakai, Takashi Okada

    Molecular therapy. Oncology   32 ( 4 )   200896 - 200896   2024.12

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    Oncolytic virotherapy shows promise as a cancer treatment approach; however, its systemic application is hindered by antibody neutralization. This issue can be overcome by using mesenchymal stem cells (MSCs) as carrier cells for oncolytic viruses (OVs). However, it remains elusive whether MSC source influences the antitumor effect. Here, we demonstrate that their source affects the migration ability and oncolytic activity of OV-loaded MSCs. Among human MSCs derived from different tissues, bone marrow-derived MSCs (BMMSCs) showed a high migration ability toward cancer cells in two- and three-dimensional MSC-cancer cell co-culture models. Comprehensive gene expression and Gene Ontology-based functional analyses suggested that genes involved in cell migration and cytokine response influence the cancer-specific tropism of BMMSCs. Furthermore, MSC origin affected the susceptibility to OVs, including cytotoxicity resistance and OV release from MSCs. MSC-mediated OV delivery significantly increased the viral spread and antitumor activity compared with delivery by OVs alone, and OV-loaded BMMSCs demonstrated the most potent antitumor effect among OV-loaded MSCs. Our results offer promising insights into cancer gene therapy with carrier cells and can help with the selection of an appropriate MSC source for MSC-based OV therapy.

    DOI: 10.1016/j.omton.2024.200896

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  • Ensemble dynamics and information flow deduction from whole-brain imaging data. International journal

    Yu Toyoshima, Hirofumi Sato, Daiki Nagata, Manami Kanamori, Moon Sun Jang, Koyo Kuze, Suzu Oe, Takayuki Teramoto, Yuishi Iwasaki, Ryo Yoshida, Takeshi Ishihara, Yuichi Iino

    PLoS computational biology   20 ( 3 )   e1011848   2024.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Cold Spring Harbor Laboratory  

    Abstract

    Recent development of large-scale activity imaging of neuronal ensembles provides opportunities for understanding how activity patterns are generated in the brain and how information is transmitted between neurons or neuronal ensembles. However, methodologies for extracting the component properties that generate overall dynamics are still limited. In this study, the results of time-lapse 3D imaging (4D imaging) of head neurons of the nematodeC. eleganswere analyzed by hitherto unemployed methodologies.

    By combining time-delay embedding with independent component analysis, the whole-brain activities were decomposed to a small number of component dynamics. Results from multiple samples, where different subsets of neurons were observed, were further combined by matrix factorization, revealing common dynamics from neuronal activities that are apparently divergent across sampled animals. By this analysis, we could identify components that show common relationships across different samples and those that show relationships distinct between individual samples.

    We also constructed a network model building on time-lagged prediction models of synaptic communications. This was achieved by dimension reduction of 4D imaging data using the general framework gKDR (gradient kernel dimension reduction). The model is able to decompose basal dynamics of the network. We further extended the model by incorporating probabilistic distribution, resulting in models that we call gKDR-GMM and gKDR-GP. The models capture the overall relationships of neural activities and reproduce the stochastic but coordinated dynamics in the neural network simulation. By virtual manipulation of individual neurons and synaptic contacts in this model, information flow could be estimated from whole-brain imaging results.

    DOI: 10.1371/journal.pcbi.1011848

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  • WormTensor: a clustering method for time-series whole-brain activity data from C. elegans

    Koki Tsuyuzaki, Kentaro Yamamoto, Yu Toyoshima, Hirofumi Sato, Manami Kanamori, Takayuki Teramoto, Takeshi Ishihara, Yuichi Iino, Itoshi Nikaido

    BMC Bioinformatics   24 ( 1 )   2023.6

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    Background

    In the field of neuroscience, neural modules and circuits that control biological functions have been found throughout entire neural networks. Correlations in neural activity can be used to identify such neural modules. Recent technological advances enable us to measure whole-brain neural activity with single-cell resolution in several species including $$Caenorhabditis\ elegans$$. Because current neural activity data in C. elegans contain many missing data points, it is necessary to merge results from as many animals as possible to obtain more reliable functional modules.

    Results

    In this work, we developed a new time-series clustering method, , to identify functional modules using whole-brain activity data from C. elegans. uses a distance measure, modified shape-based distance to account for the lags and the mutual inhibition of cell–cell interactions and applies the tensor decomposition algorithm multi-view clustering based on matrix integration using the higher orthogonal iteration of tensors (HOOI) algorithm (), which can estimate both the weight to account for the reliability of data from each animal and the clusters that are common across animals.

    Conclusion

    We applied the method to 24 individual C. elegans and successfully found some known functional modules. Compared with a widely used consensus clustering method to aggregate multiple clustering results, showed higher silhouette coefficients. Our simulation also showed that is robust to contamination from noisy data. is freely available as an /CRAN package https://cran.r-project.org/web/packages/WormTensor.

    DOI: 10.1186/s12859-023-05230-2

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    Other Link: https://link.springer.com/article/10.1186/s12859-023-05230-2/fulltext.html

  • Different modes of stimuli delivery elicit changes in glutamate driven, experience-dependent interneuron response in C. elegans. International journal

    Llian Mabardi, Hirofumi Sato, Yu Toyoshima, Yuichi Iino, Hirofumi Kunitomo

    Neuroscience research   2022.10

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    Memory-related neuronal responses are often elicited by sensory stimuli that recapitulate previous experience. Despite the importance of this sensory input processing, its underlying mechanisms remain poorly understood. Caenorhabditis elegans chemotax towards salt concentrations experienced in the presence of food. The amphid sensory neurons ASE-left and ASE-right respond to increases and decreases of ambient salt concentration in opposite manners. AIA, AIB and AIY interneurons are post-synaptic to the ASE pair and are thought to be involved in the processing of salt information transmitted from ASE. However, it remains elusive how the responses of these interneurons are regulated by stimulus patterns. Here we show that AIY interneurons display an experience-dependent response to gradual salt concentration changes but not to abrupt stepwise concentration changes. Animals with AIY intact (but AIA and AIB ablated) chemotax towards low salt concentrations similarly to wild-type animals after cultivation with low salt. ASE neurons transmit salt information about the environment through glutamatergic signaling, directing the activity of the interneurons AIY that promote movement towards favorable conditions.

    DOI: 10.1016/j.neures.2022.10.004

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  • Molecular encoding and synaptic decoding of context during salt chemotaxis in C. elegans. International journal

    Shingo Hiroki, Hikari Yoshitane, Hinako Mitsui, Hirofumi Sato, Chie Umatani, Shinji Kanda, Yoshitaka Fukada, Yuichi Iino

    Nature communications   13 ( 1 )   2928 - 2928   2022.5

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    Animals navigate toward favorable locations using various environmental cues. However, the mechanism of how the goal information is encoded and decoded to generate migration toward the appropriate direction has not been clarified. Here, we describe the mechanism of migration towards a learned concentration of NaCl in Caenorhabditis elegans. In the salt-sensing neuron ASER, the difference between the experienced and currently perceived NaCl concentration is encoded as phosphorylation at Ser65 of UNC-64/Syntaxin 1 A through the protein kinase C(PKC-1) signaling pathway. The phosphorylation affects basal glutamate transmission from ASER, inducing the reversal of the postsynaptic response of reorientation-initiating neurons (i.e., from inhibitory to excitatory), guiding the animals toward the experienced concentration. This process, the decoding of the context, is achieved through the differential sensitivity of postsynaptic excitatory and inhibitory receptors. Our results reveal the mechanism of migration based on the synaptic plasticity that conceptually differs from the classical ones.

    DOI: 10.1038/s41467-022-30279-7

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  • Simultaneous recording of behavioral and neural responses of free-moving nematodes C. elegans. Reviewed International journal

    Hirofumi Sato, Hirofumi Kunitomo, Xianfeng Fei, Koichi Hashimoto, Yuichi Iino

    STAR protocols   2 ( 4 )   101011 - 101011   2021.12

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    To reveal the neural mechanisms that control animal behavior, it is necessary to link the neural responses to behavioral changes and interpret them. We have developed a protocol to simultaneously record the behavior and neural activity of freely moving C. elegans by combining a microfluidic device and a tracking stage. Here we detail the protocol for the experiment, with an example of behavioral and neural responses of nematodes to salt concentration changes. For complete details on the use and execution of this protocol, please refer to Sato et al. (2021).

    DOI: 10.1016/j.xpro.2021.101011

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  • Glutamate signaling from a single sensory neuron mediates experience-dependent bidirectional behavior in Caenorhabditis elegans. Reviewed International journal

    Hirofumi Sato, Hirofumi Kunitomo, Xianfeng Fei, Koichi Hashimoto, Yuichi Iino

    Cell reports   35 ( 8 )   109177 - 109177   2021.5

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    Orientation and navigation behaviors of animals are modulated by past experiences. However, little is known about the mechanisms by which sensory inputs are translated into multi-directional orientation behaviors in an experience-dependent manner. Here, we report a neural mechanism for bidirectional salt-concentration chemotaxis of Caenorhabditis elegans. The salt-sensing neuron ASE right (ASER) is always activated by a decrease of salt concentration, while the directionality of reorientation behaviors is inverted depending on previous salt experiences. AIB, the interneuron postsynaptic to ASER, and neurons farther downstream of AIB show experience-dependent bidirectional responses, which are correlated with reorientation behaviors. These bidirectional behavioral and neural responses are mediated by glutamate released from ASER. Glutamate acts through the excitatory glutamate receptor GLR-1 and inhibitory glutamate receptor AVR-14, both acting in AIB. These findings suggest that experience-dependent reorientation behaviors are generated by altering the magnitude of excitatory and inhibitory postsynaptic signals from a sensory neuron to interneurons.

    DOI: 10.1016/j.celrep.2021.109177

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  • Roles of the ClC chloride channel CLH-1 in food-associated salt chemotaxis behavior of C. elegans. Reviewed International journal

    Chanhyun Park, Yuki Sakurai, Hirofumi Sato, Shinji Kanda, Yuichi Iino, Hirofumi Kunitomo

    eLife   10   2021.1

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    The ability of animals to process dynamic sensory information facilitates foraging in an ever-changing environment. However, molecular and neural mechanisms underlying such ability remain elusive. The ClC anion channels/transporters play a pivotal role in cellular ion homeostasis across all phyla. Here, we find a ClC chloride channel is involved in salt concentration chemotaxis of Caenorhabditis elegans. Genetic screening identified two altered-function mutations of clh-1 that disrupt experience-dependent salt chemotaxis. Using genetically encoded fluorescent sensors, we demonstrate that CLH-1 contributes to regulation of intracellular anion and calcium dynamics of salt-sensing neuron, ASER. The mutant CLH-1 reduced responsiveness of ASER to salt stimuli in terms of both temporal resolution and intensity, which disrupted navigation strategies for approaching preferred salt concentrations. Furthermore, other ClC genes appeared to act redundantly in salt chemotaxis. These findings provide insights into the regulatory mechanism of neuronal responsivity by ClCs that contribute to modulation of navigation behavior.

    DOI: 10.7554/eLife.55701

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  • Neuron ID dataset facilitates neuronal annotation for whole-brain activity imaging of C. elegans. Reviewed International journal

    Yu Toyoshima, Stephen Wu, Manami Kanamori, Hirofumi Sato, Moon Sun Jang, Suzu Oe, Yuko Murakami, Takayuki Teramoto, Chanhyun Park, Yuishi Iwasaki, Takeshi Ishihara, Ryo Yoshida, Yuichi Iino

    BMC biology   18 ( 1 )   30 - 30   2020.3

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    BACKGROUND: Annotation of cell identity is an essential process in neuroscience that allows comparison of cells, including that of neural activities across different animals. In Caenorhabditis elegans, although unique identities have been assigned to all neurons, the number of annotatable neurons in an intact animal has been limited due to the lack of quantitative information on the location and identity of neurons. RESULTS: Here, we present a dataset that facilitates the annotation of neuronal identities, and demonstrate its application in a comprehensive analysis of whole-brain imaging. We systematically identified neurons in the head region of 311 adult worms using 35 cell-specific promoters and created a dataset of the expression patterns and the positions of the neurons. We found large positional variations that illustrated the difficulty of the annotation task. We investigated multiple combinations of cell-specific promoters driving distinct fluorescence and generated optimal strains for the annotation of most head neurons in an animal. We also developed an automatic annotation method with human interaction functionality that facilitates annotations needed for whole-brain imaging. CONCLUSION: Our neuron ID dataset and optimal fluorescent strains enable the annotation of most neurons in the head region of adult C. elegans, both in full-automated fashion and a semi-automated version that includes human interaction functionalities. Our method can potentially be applied to model species used in research other than C. elegans, where the number of available cell-type-specific promoters and their variety will be an important consideration.

    DOI: 10.1186/s12915-020-0745-2

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  • An annotation dataset facilitates automatic annotation of whole-brain activity imaging of C. elegans

    Yu Toyoshima, Stephen Wu, Manami Kanamori, Hirofumi Sato, Moon Sun Jang, Suzu Oe, Yuko Murakami, Takayuki Teramoto, ChanHyun Park, Yuishi Iwasaki, Takeshi Ishihara, Ryo Yoshida, Yuichi Iino

    bioRxiv   2019.7

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    Publisher:Cold Spring Harbor Laboratory  

    <title>Abstract</title>Annotation of cell identity is an essential process in neuroscience that allows for comparing neural activities across different animals. In <italic>C. elegans</italic>, although unique identities have been assigned to all neurons, the number of annotatable neurons in an intact animal is limited in practice and comprehensive methods for cell annotation are required. Here we propose an efficient annotation method that can be integrated with the whole-brain imaging technique. We systematically identified neurons in the head region of 311 adult worms using 35 cell-specific promoters and created a dataset of the expression patterns and the positions of the neurons. The large positional variations illustrated the difficulty of the annotation task. We investigated multiple combinations of cell-specific promoters to tackle this problem. We also developed an automatic annotation method with human interaction functionality that facilitates annotation for whole-brain imaging.

    DOI: 10.1101/698241

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  • Causality analysis of the whole-brain activity data in C. elegans II

    Iwasaki Y., Jang M. S., Yoshida R., Iino Y., Ishihara T., Sato H., Oe S., Kuge S., Teramoto T., Tokunaga T., Hirose O., Wu S., Toyoshima Y.

    Meeting Abstracts of the Physical Society of Japan   73 ( 0 )   2315 - 2315   2018

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.73.2.0_2315

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  • Causality analysis of the whole-brain activity data in C. elegans

    Iwasaki Y., Yoshida R., Iino Y., Ishihara T., Sato H., Oe S., Teramoto T., Tokunaga T., Hirose O., Wu S., Toyoshima Y., Jang M. S.

    Meeting Abstracts of the Physical Society of Japan   73 ( 0 )   2853 - 2853   2018

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    DOI: 10.11316/jpsgaiyo.73.1.0_2853

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  • A Gustatory Neural Circuit of Caenorhabditis elegans Generates Memory-Dependent Behaviors in Na+ Chemotaxis. Reviewed International journal

    Lifang Wang, Hirofumi Sato, Yohsuke Satoh, Masahiro Tomioka, Hirofumi Kunitomo, Yuichi Iino

    The Journal of neuroscience : the official journal of the Society for Neuroscience   37 ( 8 )   2097 - 2111   2017.2

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    Animals show various behaviors in response to environmental chemicals. These behaviors are often plastic depending on previous experiences. Caenorhabditis elegans, which has highly developed chemosensory system with a limited number of sensory neurons, is an ideal model for analyzing the role of each neuron in innate and learned behaviors. Here, we report a new type of memory-dependent behavioral plasticity in Na+ chemotaxis generated by the left member of bilateral gustatory neuron pair ASE (ASEL neuron). When worms were cultivated in the presence of Na+, they showed positive chemotaxis toward Na+, but when cultivated under Na+-free conditions, they showed no preference regarding Na+ concentration. Both channelrhodopsin-2 (ChR2) activation with blue light and up-steps of Na+ concentration activated ASEL only after cultivation with Na+, as judged by increase in intracellular Ca2+ Under cultivation conditions with Na+, photoactivation of ASEL caused activation of its downstream interneurons AIY and AIA, which stimulate forward locomotion, and inhibition of its downstream interneuron AIB, which inhibits the turning/reversal behavior, and overall drove worms toward higher Na+ concentrations. We also found that the Gq signaling pathway and the neurotransmitter glutamate are both involved in the behavioral response generated by ASEL.SIGNIFICANCE STATEMENT Animals have acquired various types of behavioral plasticity during their long evolutionary history. Caenorhabditis elegans prefers odors associated with food, but plastically changes its behavioral response according to previous experience. Here, we report a new type of behavioral response generated by a single gustatory sensory neuron, the ASE-left (ASEL) neuron. ASEL did not respond to photostimulation or upsteps of Na+ concentration when worms were cultivated in Na+-free conditions; however, when worms were cultivated with Na+, ASEL responded and inhibited AIB to avoid turning and stimulated AIY and AIA to promote forward locomotion, which collectively drove worms toward higher Na+ concentrations. Glutamate and the Gq signaling pathway are essential for driving worms toward higher Na+ concentrations.

    DOI: 10.1523/JNEUROSCI.1774-16.2017

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  • Regulation of experience-dependent bidirectional chemotaxis by a neural circuit switch in Caenorhabditis elegans. Reviewed International journal

    Yohsuke Satoh, Hirofumi Sato, Hirofumi Kunitomo, Xianfeng Fei, Koichi Hashimoto, Yuichi Iino

    The Journal of neuroscience : the official journal of the Society for Neuroscience   34 ( 47 )   15631 - 7   2014.11

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    The nematode Caenorhabditis elegans changes its chemotaxis to NaCl depending on previous experience. At the behavioral level, this chemotactic plasticity is generated by reversing the elementary behaviors for chemotaxis, klinotaxis, and klinokinesis. Here, we report that bidirectional klinotaxis is achieved by the proper use of at least two different neural subcircuits. We simulated an NaCl concentration change by activating an NaCl-sensitive chemosensory neuron in phase with head swing and successfully induced klinotaxis-like curving. The curving direction reversed depending on preconditioning, which was consistent with klinotaxis plasticity under a real concentration gradient. Cell-specific ablation and activation of downstream interneurons revealed that ASER-evoked curving toward lower concentration was mediated by AIY interneurons, whereas curving to the opposite direction was not. These results suggest that the experience-dependent bidirectionality of klinotaxis is generated by a switch between different neural subcircuits downstream of the chemosensory neuron.

    DOI: 10.1523/JNEUROSCI.1757-14.2014

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  • Concentration memory-dependent synaptic plasticity of a taste circuit regulates salt concentration chemotaxis in Caenorhabditis elegans. Reviewed International journal

    Hirofumi Kunitomo, Hirofumi Sato, Ryo Iwata, Yohsuke Satoh, Hayao Ohno, Koji Yamada, Yuichi Iino

    Nature communications   4   2210 - 2210   2013

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    It is poorly understood how sensory systems memorize the intensity of sensory stimulus, compare it with a newly sensed stimulus, and regulate the orientation behaviour based on the memory. Here we report that Caenorhabditis elegans memorizes the environmental salt concentration during cultivation and exhibits a strong behavioural preference for this concentration. The right-sided amphid gustatory neuron known as ASER, senses decreases in salt concentration, and this information is transmitted to the postsynaptic AIB interneurons only in the salt concentration range lower than the cultivation concentration. In this range, animals migrate towards higher concentration by promoting turning behaviour upon decreases in salt concentration. These observations provide a mechanism for adjusting the orientation behaviour based on the memory of sensory stimulus using a simple neural circuit.

    DOI: 10.1038/ncomms3210

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Misc.

  • A neural circuit for memory-dependent Na+ Chemotaxis dissected in Caenorhabditis elegans

    Lifang Wang, Hirofumi Sato, Yohsuke Satoh, Masahiro Tomioka, Hirofumi Kunitomo, Yuichi Iino

    CHEMICAL SENSES   41 ( 9 )   E270 - E270   2016.11

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    Language:English   Publishing type:Research paper, summary (international conference)   Publisher:OXFORD UNIV PRESS  

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  • 3次元動画像内の非常に多数の細胞領域を自動追跡するための粒子フィルタ手法の開発

    広瀬修, 川口翔太郎, 徳永旭将, 豊島有, 寺本孝行, 佐藤賢二, 池端久貴, 佐藤博文, 久下小百合, 石原健, 飯野雄一, 吉田亮

    人工知能学会全国大会論文集(CD-ROM)   2014 ( 0 )   2C32in - 2C32in   2014

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  • Molecular and neural mechanisms of behavioral plasticity based on salt taste memory in C. elegans

    Hirofumi Kunitomo, Hirofumi Sato, Ryo Iwata, Takeshi Adachi, Hayao Ohno, Yuichi Iino

    NEUROSCIENCE RESEARCH   71   E40 - E40   2011

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    Language:English   Publishing type:Research paper, summary (international conference)   Publisher:ELSEVIER IRELAND LTD  

    DOI: 10.1016/j.neures.2011.07.177

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Presentations

  • Experience-dependent modulation of gustatory neural circuit that participates in a salt concentration memory International conference

    5th East Asia C. elegans Meeting  2012.6 

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    Event date: 2012.6

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  • Neural Dynamics of Experience-Dependent Gustatory Behavior International conference

    Hirofumi Sato, Hirofumi Kunitomo, Xianfeng Fei, Koichi Hashimoto, Yuichi Iino

    CeNeuro2018 

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  • Experience-dependent modulation of the neuronal response in the gustatory circuit International conference

    18th international C. elegans meeting  2011.6 

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  • 線虫の味覚神経においてホスホリパーゼC-epsilonは経験に依存した塩走性を制御する

    國友博文, 岩田遼, 佐藤博文, 飯野雄一

    Neuro2013  2013.6 

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  • 線虫C. elegansの塩濃度記憶を制御する神経回路の解析

    2013.6 

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  • 線虫の味覚可塑性とその機構

    飯野雄一, 國友博文, 大野速雄, 佐藤博文, 佐藤陽介, 土屋純一, 山田康嗣, 加藤紳也, 内藤泰樹, 富岡征大

    Neuro2013  2013.6 

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    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

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  • 線虫C. elegansの塩濃度記憶に依存した神経応答の解析

    佐藤博文, 國友博文, 小田茂和, 飯野雄一

    第34回日本分子生物学会年会  2011.12 

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  • 線虫の経験依存的な塩走性行動はグルタミン酸シグナルによって制御される

    佐藤博文, 國友博文, Xianfeng Fei, 橋本浩一, 飯野雄一

    第43回日本分子生物学会年会  2020.12 

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  • Neural dynamics for bidirectional regulation of experience-dependent gustatory behavior. International conference

    H. Sato, H. Kunitomo, X. Fei, K. Hashimoto, Y. Iino

    22nd International C. elegans Conference  2019 

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  • 経験塩濃度依存的な行動を制御する神経回路の動態

    佐藤博文, 國友博文, Xianfeng Fei, 橋本浩一, 飯野雄一

    第42回日本分子生物学会年会  2019.12 

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  • 味覚学習の分子・神経機構

    國友博文, 佐藤博文, 飯野雄一

    線虫研究の未来を創る会  2018.9 

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  • 線虫の動きと神経応答の同時測定

    Hirofumi Sato, Hirofumi Kunitomo, Xianfeng Fei, Koichi Hashimoto, Yuichi Iino

    2018.9 

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  • 線虫C. エレガンスの塩濃度の記憶と走化性の分子・神経機構

    國友博文, 佐藤博文, 飯野雄一

    次世代脳プロジェクト 冬のシンポジウム  2017.12 

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  • 線虫の塩走性学習の分子・神経機構

    國友博文, 佐藤博文, 飯野雄一

    第41回日本神経科学大会  2018.7 

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  • 線虫の化学走性における定位行動の神経機構

    佐藤陽介, 佐藤博文, 國友博文, 飯野雄一

    第38回 日本分子生物学会年会  2015.12 

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  • A neural circuit for experience-dependent salt chemotaxis in C. elegans International conference

    Hirofumi Sato, Hirofumi Kunitomo, Xianfeng Fei, Koichi Hashimoto, Yuichi Iino

    CeNeuro2016 (C. elegans Topic Meeting: NEURONAL DEVELOPMENT, SYNAPTIC FUNCTION & BEHAVIOR)  2016.7 

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  • Learning-induced Changes of Neural and Behavioral Responses to Chemosensory Stimuli in C. elegans Invited

    2015.3 

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  • A gustatory neural circuit for experience-dependent salt chemotaxis in C. elegans International conference

    Hirofumi Sato, Hirofumi Kunitomo, Xianfeng Fei, Koichi Hashimoto, Yuichi Iino

    20th International C. elegans Meeting  2015.6 

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  • 線虫の化学走性の可塑性の分子神経機構 Invited

    飯野雄一, 大野速雄, 佐藤博文, 佐藤陽介, 富岡征大, 國友博文

    日本動物学会第84回大会  2013.9 

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  • 線虫の経験塩濃度依存的な行動を制御する神経回路の解明

    佐藤博文, 國友博文, Xianfeng Fei, 橋本浩一, 飯野雄一

    第37回 日本分子生物学会年会  2014.11 

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  • A gustatory neural circuit for salt concentration memory in Caenorhabditis elegans. International conference

    H. Sato, H. Kunitomo, S. Oda, Y. Iino

    The 19th International C. elegans Meeting  2013.6 

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  • 線虫の全中枢神経イメージングによる神経活動と感覚運動情報との関連解析

    飯野雄一, 豊島有, 寺本孝行, Wu Stephen, Moon-Sun Jang, 滝沢拓己, 徳永旭将, 佐藤博文, 広瀬修, 大江紗, 久下小百合, 岩崎唯史, 吉田亮, 石原健

    第40回日本神経科学大会  2017.7 

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  • A gustatory neural circuit for experience-dependent salt chemotaxis in C. elegans. International conference

    Hirofumi Sato, Hirofumi Kunitomo, Xianfeng Fei, Koichi Hashimoto, Yuichi Iino

    NSF-AMED Workshop: Comparative Principles of Brain Architecture and Functions  2016.11 

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  • A gustatory neural circuit for experience-dependent behavioral plasticity. International conference

    Hirofumi Sato, Hirofumi Kunitomo, Xianfeng Fei, Koichi Hashimoto, Yuichi Iino

    21st International C. elegans Meeting  2017.6 

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  • C. エレガンスの味覚記憶と行動可塑性の分子神経機構

    國友博文, 佐藤博文, 安達健, 岩田遼, 大野速雄, 飯野雄一

    第34回日本神経科学大会  2011.9 

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  • クッパー細胞の機械刺激に対する応答機構とその生理学的意義の解明

    佐藤 博文, 入江 利幸, 豊島 翔太, 菱川 大介, サウンザッチ ニーン, 藤岡 真央, 酒井 真志人

    第47回日本分子生物学会年会  2024 

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  • Molecules and neural network underlying salt preference Invited

    CeNeuro2022  2022 

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  • 自由に行動する線虫の全脳活動の計測と解析

    豊島 有, 久世晃暢, 田澤右京, 永田大貴, 金森 真奈美, 佐藤 博文, 石原 健, 飯野 雄一

    第45回日本分子生物学会年会  2022 

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  • Pathophysiological Significance of PIEZO1-Mediated Mechanotransduction in Kupffer Cells

    Toshiyuki Irie, Hirofumi Sato, Daisuke Hishikawa, Shota Toyoshima, Saung Zarchi Hnin, Yoichi Kawano, Hiroshi Yoshida, Mashito Sakai

    The 37th Meeting of Japanese Society of Hepato-Biliary-Pancreatic Surgery  2025 

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Awards

  • 研究奨励賞

    2013.3   東京大学大学院理学系研究科  

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Research Projects

  • 肝星細胞における機械刺激伝達の分子機構とその意義の解明

    Grant number:24K10057  2024.4 - 2027.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    佐藤 博文, 酒井 真志人

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    Grant amount:\4550000 ( Direct Cost: \3500000 、 Indirect Cost:\1050000 )

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  • 機械刺激受容体候補分子 TMC のマクロファージにおける機能の解明

    Grant number:2024-4076  2024.4 - 2025.2

    公益財団法人 日本科学協会  笹川科学研究助成 

    佐藤博文

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  • 線虫の記憶の実体と連合学習機構の解明

    Grant number:21K15182  2021.4 - 2025.3

    日本学術振興会  科学研究費助成事業  若手研究

    佐藤 博文

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    Grant amount:\4680000 ( Direct Cost: \3600000 、 Indirect Cost:\1080000 )

    本研究課題は、動物が過去の経験に基づいて、感覚情報の処理機構を調節するメカニズムを明らかにすることを目的としている。昨年度に実施した研究成果としては、まず線虫を用いてこれまで行ってきた4Dイメージングやシミュレーションなどの実験の結果について、より高度な解析を実施し、その意義を明らかにした。これにより、全脳レベルでの時系列イメージングデータを基にして、個々の神経の活動をクラスタリングすることが可能となった。また全脳レベルでの神経活動データを独立成分分析などの手法で解析することにより、いくつかの重要なコンポーネントを見出した。全脳レベルでの神経活動を俯瞰して見た場合、個体ごとの差が非常に大きかったものの、独立成分分析、時間遅れ埋め込み、行列分解などの手法を組み合わせた数理的解析を行うことにより、個体間で共通する神経活動モチーフを抽出することに成功した。また過去の神経活動を基にその後の神経活動を予測する時系列予測モデル(gKDR-GMM)を用いることで、過去の全脳レベルの神経活動から未来の全脳神経活動を予測するシミュレーションを行うことが可能になった。これにより、神経系を構成する各神経細胞間の接続の強さを推定することができるようになった。シミュレーションの結果、線虫の動きを制御するための主要な神経細胞間での接続は強くかつ固定的であることが分かったが、一方でそれらの神経群と感覚神経群との相互作用は比較的弱くまた可変的であることが予測された。またシナプス接続だけでなくギャップ結合の重要性も確認された。さらに哺乳類細胞を用いた実験系の立ち上げも完了し、次世代シーケンス解析によるデータが得られつつある。

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  • Comprehensive investigation of molecular and neural mechanisms controlling experience-dependent behavior.

    Grant number:19K16286  2019.4 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Early-Career Scientists

    Hirofumi Sato

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    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

    In this research project, we first showed that sensory neurons always show excitation in response to a decrease in salt concentration regardless of the salt concentration experienced in the past, while the primary interneurons and downstream neurons show a reversal in response to changes in salt concentration in a concentration-dependent manner. We found that glutamate release from sensory nerves and two types of glutamate receptors, excitatory and inhibitory, in interneurons contribute to this mechanism. Furthermore, we investigated the contribution of various molecules and receptors in neurons to experience-dependent changes in behavior and neural activity using mutants and forced-expression strains, including those in higher animals.

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  • Molecular and neural mechanisms for a memory of sensory stimulus and behavioral choice

    Grant number:26430007  2014.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    KUNITOMO Hirofumi, IINO Yuichi, SATO Hirofumi, PARK ChanH

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    Grant amount:\5070000 ( Direct Cost: \3900000 、 Indirect Cost:\1170000 )

    Learning ability is essential for animals to better adapt and survive in variable environment, and such ability is implemented even in animals with simple neural circuit. Salt chemotaxis of the soil nematode Caenorhabditis elegans is a memory-dependent navigation behavior: animals are attracted to the salt concentration at which they have been fed, whereas they avoid it if they have been starved. We characterized the genes and neural mechanisms required for this learning.
    Synaptic transmission from the taste receptor neuron ASER to a pair of interneurons AIB has been implicated as the site of modulation in salt chemotaxis learning. We here revealed that the sign of synaptic transmission reverses according to salt experience, which might generate migration toward opposite directions on the salt gradient. Both excitatory and inhibitory transmissions were at least partially glutamatergic and dependent on EAT-4 (VGLUT) that act in ASER and GLR-1 (AMPA receptor) in AIB.

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  • Discovery of new molecules involved in learning and memory and study of their mode of action

    Grant number:25115010  2013.6 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    IINO YUICHI, KUNITOMO Hirofumi, TOMIOKA Masahiro, TOYOSHIMA Yu, OHNO Hayao, Sato Hirofumi, WANG Lifang, MORI Keita, YANAGI Shuichi, SAKAI Naoko

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    Grant amount:\106990000 ( Direct Cost: \82300000 、 Indirect Cost:\24690000 )

    By using C. elegans, we tried to reveal molecular dynamics, circuit dynamics and behavioral dynamics for learning and memory. We found multiple molecular-neural mechanisms for short term memory, memory of stimulus strength, inter-cellular transfer of memory signal and single-cell differential memory.

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  • 線虫の環境記憶と行動の可塑性を制御する分子神経基盤の解明

    Grant number:13J09506  2013.4 - 2016.3

    日本学術振興会  科学研究費助成事業 特別研究員奨励費  特別研究員奨励費

    佐藤 博文

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    Grant amount:\2700000 ( Direct Cost: \2700000 )

    本研究は、線虫の塩濃度記憶に基づく行動調節機構を分子・神経レベルで明らかにしようとするものである。これまでの研究により、塩を受容する感覚神経とその直下の複数の介在神経(AIA、AIB、AIY)について経験依存的な神経応答の観察を行った。そこで本年度はまず、さらに下流の介在神経について、塩濃度変化に対する神経応答の観察を行った。その結果、AIZ介在神経において、経験塩濃度依存的な神経応答を見出した。その応答パターンはこれまでに観察されたAIB介在神経の応答と一致し、AIY介在神経の応答とは逆方向であった。そのためAIY神経から抑制性のシナプス入力を受け、AIB神経には興奮性シナプス出力をしていると考えられる。
    続いて経験塩濃度に依存した各神経の応答と、線虫の行動とを直接的に観察する実験を行った。この実験では2cm四方のPDMS製微小流路を用い、内部を自由に動く線虫を追跡して各時刻での速度を求めると同時に、蛍光画像を撮影することでその時点での神経の細胞内カルシウム濃度の変化(相対量)を求めた。その結果、塩濃度変化刺激に対し、線虫の行動は刺激よりも高い塩濃度で飼われたか低い塩濃度で飼われたかによって逆転した。これに対し、塩を受容する感覚神経ASERの応答は経験塩濃度依存的に逆転せず、感覚入力に相関した応答を示した。一方でAIB介在神経とその下流のRIM介在/運動神経では経験塩濃度依存的にその応答が逆転し、行動と相関する応答を示した。そのため、ASER-AIB-RIMという神経回路を通じて線虫の経験塩濃度依存的な行動が制御されていることが示唆され、また感覚神経-介在神経間において感覚入力の情報が行動出力の情報へと変換されていることが考えられる。

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