大場 陽介 ( オオバ ヨウスケ )

OHBA Yohsuke

写真a

所属(所属キャンパス)

薬学部 薬学科 代謝生理化学講座 ( 芝共立 )

職名

専任講師

研究室住所

東京都港区芝公園1-5-30

経歴 【 表示 / 非表示

  • 2015年04月
    -
    2016年01月

    東京大学, 薬学系研究科, 助教

  • 2016年02月
    -
    2020年09月

    Max Planck Institute for Biology of Ageing, ポストドクトラルフェロー

  • 2020年10月
    -
    2022年04月

    武田薬品工業, 研究員

  • 2022年05月
    -
    継続中

    慶應義塾大学, 薬学部, 専任講師

学歴 【 表示 / 非表示

  • 2006年04月
    -
    2010年03月

    東京大学, 薬学部, 薬学科

    大学, 卒業

  • 2010年04月
    -
    2012年03月

    東京大学, 薬学系研究科

    大学院, 修了, 修士

  • 2012年04月
    -
    2015年03月

    東京大学, 薬学系研究科

    大学院, 修了, 博士

学位 【 表示 / 非表示

  • 博士(薬科学), 東京大学, 課程, 2015年03月

    小胞体ストレス応答分子IRE1を介した膜脂肪酸ストレス応答機構の解明

 

研究分野 【 表示 / 非表示

  • ライフサイエンス / 細胞生物学

研究キーワード 【 表示 / 非表示

  • ミトコンドリア

  • リン脂質

  • 脂質輸送タンパク質

 

論文 【 表示 / 非表示

  • Mitochondrial cardiolipin remodeling facilitates efficient myoblast differentiation

    Ohba Y., Fujiwara C.A., Arita M.

    Journal of Lipid Research 66 ( 11 )  2025年11月

    ISSN  00222275

     概要を見る

    During myoblast differentiation, mitochondria undergo dynamic changes in their morphology and function. Although the mitochondrial membrane lipid environment is closely related to mitochondrial integrity, how mitochondrial lipid composition changes during myoblast differentiation and whether it is involved in efficient differentiation remains unclear. In this study, we applied LC-MS/MS-based untargeted lipidomics to the mitochondria isolated from C2C12 murine myoblasts and found that the proportion of linoleic acid (C18:2)containing cardiolipin (CL) increased during the early stages of differentiation. In parallel, the expression of tafazzin, a mitochondrial CL remodeling enzyme, increased in line with myoblast differentiation. Notably, the increase in C18:2-containing CL was not suppressed by the knockdown of MyoD (myoblast determination protein 1), a master transcription factor for myoblast differentiation. In contrast, the inhibition of CL biosynthesis and remodeling significantly suppressed differentiation progression, which was partially rescued by exogenous supplementation with C18:2. Similar trends in CL remodeling were observed when primary stem cells isolated from mouse skeletal muscle differentiated into myotubes. These results demonstrate that mitochondrial CL remodeling at an early stage is required to promote efficient myoblast differentiation.

  • Characterization of UGT8 as a monogalactosyl diacylglycerol synthase in mammals

    Ohba Y., Motohashi M., Arita M.

    Journal of Biochemistry 177 ( 2 ) 141 - 152 2024年12月

    研究論文(学術雑誌), 共著, 筆頭著者, 査読有り,  ISSN  0021924X

     概要を見る

    Monogalactosyl diacylglycerol (MGDG) is a major membrane lipid component in plants and is crucial for proper thylakoid functioning. However, MGDG in mammals has not received much attention, partly because of its relative scarcity in mammalian tissues. In addition, the biosynthetic pathway of MGDG in mammals has not been thoroughly analysed, although some reports have suggested that UGT8, a ceramide galactosyltransferase, has the potential to catalyse MGDG biosynthesis. Here, we successfully captured the endogenous levels of MGDG in HeLa cells using liquid chromatography quadrupole time-of-flight mass spectrometry (LC–QTOF-MS)-based lipidomics. Cellular MGDG was completely depleted in CRISPR/Cas9-mediated UGT8 knockout (KO) HeLa cells. Transient overexpression of UGT8 enhanced MGDG production in HeLa cells, and the corresponding cell lysates displayed MGDG biosynthetic activity in vitro. Site-directed mutagenesis revealed that His358 within the UGT signature sequence was important for its activity. UGT8 was localized in the endoplasmic reticulum and activation of the unfolded protein response by membrane lipid saturation was impaired in UGT8 KO cells. These results demonstrate that UGT8 is an MGDG synthase in mammals and that UGT8 regulates membrane lipid saturation signals in cells.

  • Fluorescence Lifetime Imaging of Lipid Heterogeneity in the Inner Mitochondrial Membrane with a Super-photostable Environment-Sensitive Probe

    Wang J., Taki M., Ohba Y., Arita M., Yamaguchi S.

    Angewandte Chemie - International Edition 63 ( 28 )  2024年07月

    研究論文(学術雑誌), 査読有り,  ISSN  14337851

     概要を見る

    The inner mitochondrial membrane (IMM) undergoes dynamic morphological changes, which are crucial for the maintenance of mitochondrial functions as well as cell survival. As the dynamics of the membrane are governed by its lipid components, a fluorescent probe that can sense spatiotemporal alterations in the lipid properties of the IMM over long periods of time is required to understand mitochondrial physiological functions in detail. Herein, we report a red-emissive IMM-labeling reagent with excellent photostability and sensitivity to its environment, which enables the visualization of the IMM ultrastructure using super-resolution microscopy as well as of the lipid heterogeneity based on the fluorescence lifetime at the single mitochondrion level. Combining the probe and fluorescence lifetime imaging microscopy (FLIM) showed that peroxidation of unsaturated lipids in the IMM by reactive oxygen species caused an increase in the membrane order, which took place prior to mitochondrial swelling.

  • Regulation of mitochondrial proteostasis by the proton gradient

    Patron M., Tarasenko D., Nolte H., Kroczek L., Ghosh M., Ohba Y., Lasarzewski Y., Ahmadi Z.A., Cabrera-Orefice A., Eyiama A., Kellermann T., Rugarli E.I., Brandt U., Meinecke M., Langer T.

    EMBO Journal 41 ( 16 ) e110476 2022年08月

    研究論文(学術雑誌), 共著, 査読有り,  ISSN  02614189

     概要を見る

    Mitochondria adapt to different energetic demands reshaping their proteome. Mitochondrial proteases are emerging as key regulators of these adaptive processes. Here, we use a multiproteomic approach to demonstrate the regulation of the m-AAA protease AFG3L2 by the mitochondrial proton gradient, coupling mitochondrial protein turnover to the energetic status of mitochondria. We identify TMBIM5 (previously also known as GHITM or MICS1) as a Ca2+/H+ exchanger in the mitochondrial inner membrane, which binds to and inhibits the m-AAA protease. TMBIM5 ensures cell survival and respiration, allowing Ca2+ efflux from mitochondria and limiting mitochondrial hyperpolarization. Persistent hyperpolarization, however, triggers degradation of TMBIM5 and activation of the m-AAA protease. The m-AAA protease broadly remodels the mitochondrial proteome and mediates the proteolytic breakdown of respiratory complex I to confine ROS production and oxidative damage in hyperpolarized mitochondria. TMBIM5 thus integrates mitochondrial Ca2+ signaling and the energetic status of mitochondria with protein turnover rates to reshape the mitochondrial proteome and adjust the cellular metabolism.

  • Lipid signaling drives proteolytic rewiring of mitochondria by YME1L

    MacVicar, T.*, Ohba, Y.*, Nolte, H., Mayer, F.C., Tatsuta, T., Sprenger, HG., Lindner, B., Zhao, Y., Li, J., Bruns, C., Krüger, M., Habich, M., Riemer, J., Schwarzer, R., Pasparakis, M., Henschke, S., Brüning, J.C., Zamboni, N., and Langer, T.

    Nature  ( 575 ) 361 - 365 2019年11月

    研究論文(学術雑誌), 共著, 筆頭著者, 査読有り

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KOARA(リポジトリ)収録論文等 【 表示 / 非表示

総説・解説等 【 表示 / 非表示

  • 酸素欠乏によるミトコンドリアタンパク質のリプログラミング

    大場陽介

    実験医学  ( 38 ) 995 - 998 2020年

    記事・総説・解説・論説等(その他), 単著, 筆頭著者

  • Regulation of mitochondrial plasticity by the i-AAA protease YME1L

    Ohba, Y., MacVicar, T. and and Langer, T.

    Biological Chemistry  ( 401 ) 877 - 890 2020年

    共著, 筆頭著者

  • 脂質異常とオルガネラストレス

    大場陽介、河野望

    医学のあゆみ  ( 245 ) 382 - 388 2015年

    共著, 筆頭著者

  • リン脂質脂肪酸鎖メタボロームと代謝疾患

    大場陽介、河野望、新井洋由

    内分泌・糖尿病・代謝内科  ( 41 ) 341 - 346 2015年

    共著

競争的研究費の研究課題 【 表示 / 非表示

  • 膜脂質環境によるミトコンドリアプロテアーゼ活性制御機構の解明

    2023年04月
    -
    2026年03月

    大場 陽介, 基盤研究(C), 補助金,  研究代表者

 

担当授業科目 【 表示 / 非表示

  • 課題研究(代謝生理化学)

    2025年度

  • 演習(代謝生理化学)

    2025年度

  • 卒業研究1(薬学科)

    2025年度

  • 英語演習(薬学科)

    2025年度

  • 免疫代謝学特論

    2025年度

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