Updated on 2025/04/09

写真a

 
SHIMADA Midori
 
Organization
Graduate School of Medicine Program in Integrated Medicine Biological Chemistry Professor
Graduate School
Graduate School of Medicine
Undergraduate School
School of Medicine Department of Medicine
Title
Professor

Current Research Project and SDGs 1

  1. がんの治療標的に関する研究

 

Papers 49

  1. FOXO1 promotes cancer cell growth through MDM2-mediated p53 degradation

    Tomiyasu, H; Habara, M; Hanaki, S; Sato, Y; Miki, Y; Shimada, M

    CANCER SCIENCE   Vol. 116   page: 232 - 232   2025.1

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  2. Calcineurin- mediated dephosphorylation stabilizes E2F1 protein by suppressing binding of the FBXW7 ubiquitin ligase subunit Open Access

    Sato, Y; Habara, M; Hanaki, S; Masaki, T; Tomiyasu, H; Miki, Y; Sakurai, M; Morimoto, M; Kobayashi, D; Miyamoto, T; Shimada, M

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   Vol. 121 ( 41 ) page: e2414618121   2024.10

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    Language:English   Publisher:Proceedings of the National Academy of Sciences of the United States of America  

    The transcription factor E2F1 serves as a regulator of the cell cycle and promotes cell proliferation. It is highly expressed in cancer tissues and contributes to their malignant transformation. Degradation by the ubiquitin–proteasome system may help to prevent such overexpression of E2F1 and thereby to suppress carcinogenesis. A detailed understanding of the mechanisms underlying E2F1 degradation may therefore inform the development of new cancer treatments. We here identified SCFFBXW7 as a ubiquitin ligase for E2F1 by comprehensive analysis. We found that phosphorylation of E2F1 at serine-403 promotes its binding to FBXW7 (F-box/WD repeat–containing protein 7) followed by its ubiquitination and degradation. Furthermore, calcineurin, a Ca2+/calmodulin-dependent serine-threonine phosphatase, was shown to stabilize E2F1 by mediating its dephosphorylation at serine-403 and thereby preventing FBXW7 binding. Treatment of cells with Ca2+ channel blockers resulted in downregulation of both E2F1 protein and the expression of E2F1 target genes, whereas treatment with the Ca2+ ionophore ionomycin induced upregulation of E2F1. Finally, the calcineurin inhibitor FK506 attenuated xenograft tumor growth in mice in association with downregulation of E2F1 in the tumor tissue. Impairment of the balance between the opposing actions of FBXW7 and calcineurin in the regulation of E2F1 abundance may therefore play an important role in carcinogenesis.

    DOI: 10.1073/pnas.2414618121

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    Web of Science

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  3. NFAT activation by FKBP52 promotes cancer cell proliferation by suppressing p53 Open Access

    Hanaki, S; Habara, M; Tomiyasu, H; Sato, Y; Miki, Y; Masaki, T; Shibutani, S; Shimada, M

    LIFE SCIENCE ALLIANCE   Vol. 7 ( 8 )   2024.8

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    Language:English   Publisher:Life Science Alliance  

    FK506-binding protein 52 (FKBP52) is a member of the FKBP family of proline isomerases. FKBP52 is up-regulated in various cancers and functions as a positive regulator of steroid hormone receptors. Depletion of FKBP52 is known to inhibit cell proliferation; however, the detailed mechanism remains poorly understood. In this study, we found that FKBP52 depletion decreased MDM2 transcription, leading to stabilization of p53, and suppressed cell proliferation. We identified NFATc1 and NFATc3 as transcription factors that regulate MDM2. We also found that FKBP52 associated with NFATc3 and facilitated its nuclear translocation. In addition, calcineurin, a well-known Ca2+ phosphatase essential for activation of NFAT, plays a role in MDM2 transcription. Supporting this notion, MDM2 expression was found to be regulated by intracellular Ca2+. Taken together, these findings reveal a new role of FKBP52 in promoting cell proliferation via the NFAT-MDM2-p53 axis, and indicate that inhibition of FKBP52 could be a new therapeutic tool to activate p53 and inhibit cell proliferation.

    DOI: 10.26508/lsa.202302426

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  4. Calcineurin/NFATc1 pathway represses cellular cytotoxicity by modulating histone H3 expression Open Access

    Sato, Y; Habara, M; Hanaki, S; Sharif, J; Tomiyasu, H; Miki, Y; Shimada, M

    SCIENTIFIC REPORTS   Vol. 14 ( 1 ) page: 14732   2024.6

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    Language:English   Publisher:Scientific Reports  

    Excess amounts of histones in the cell induce mitotic chromosome loss and genomic instability, and are therefore detrimental to cell survival. In yeast, excess histones are degraded by the proteasome mediated via the DNA damage response factor Rad53. Histone expression, therefore, is tightly regulated at the protein level. Our understanding of the transcriptional regulation of histone genes is far from complete. In this study, we found that calcineurin inhibitor treatment increased histone protein levels, and that the transcription factor NFATc1 (nuclear factor of activated T cells 1) repressed histone transcription and acts downstream of the calcineurin. We further revealed that NFATc1 binds to the promoter regions of many histone genes and that histone transcription is downregulated in a manner dependent on intracellular calcium levels. Indeed, overexpression of histone H3 markedly inhibited cell proliferation. Taken together, these findings suggest that NFATc1 prevents the detrimental effects of histone H3 accumulation by inhibiting expression of histone at the transcriptional level.

    DOI: 10.1038/s41598-024-65769-9

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  5. FOXO1 promotes cancer cell growth through MDM2-mediated p53 degradation Open Access

    Tomiyasu, H; Habara, M; Hanaki, S; Sato, Y; Miki, Y; Shimada, M

    JOURNAL OF BIOLOGICAL CHEMISTRY   Vol. 300 ( 4 ) page: 107209   2024.4

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    Language:English   Publisher:Journal of Biological Chemistry  

    FOXO1 is a transcription factor and potential tumor suppressor that is negatively regulated downstream of PI3K-PKB/AKT signaling. Paradoxically, FOXO also promotes tumor growth, but the detailed mechanisms behind this role of FOXO are not fully understood. In this study, we revealed a molecular cascade by which the Thr24 residue of FOXO1 is phosphorylated by AKT and is dephosphorylated by calcineurin, which is a Ca2+-dependent protein phosphatase. Curiously, single nucleotide somatic mutations of FOXO1 in cancer occur frequently at and near Thr24. Using a calcineurin inhibitor and shRNA directed against calcineurin, we revealed that calcineurin-mediated dephosphorylation of Thr24 regulates FOXO1 protein stability. We also found that FOXO1 binds to the promoter region of MDM2 and activates transcription, which in turn promotes MDM2-mediated ubiquitination and degradation of p53. FOXO3a and FOXO4 are shown to control p53 activity; however, the significance of FOXO1 in p53 regulation remains largely unknown. Supporting this notion, FOXO1 depletion increased p53 and p21 protein levels in association with the inhibition of cell proliferation. Taken together, these results indicate that FOXO1 is stabilized by calcineurin-mediated dephosphorylation and that FOXO1 supports cancer cell proliferation by promoting MDM2 transcription and subsequent p53 degradation.

    DOI: 10.1016/j.jbc.2024.107209

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Books 3

  1. エピジェネティクス実験スタンダード Reviewed

    島田 緑, 中西 真( Role: Joint author ,  ヒストンのリン酸化、ユビキチン化活性測定法)

    羊土社  2017 

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    Total pages:10   Language:Japanese Book type:Textbook, survey, introduction

  2. がん基盤生物学 Reviewed

    廣川 高久, 島田 緑, 竹山 廣光, 中西 真( Role: Joint author ,  G2/M期チェックポイントを標的としたがん細胞特異的抗がん療法増強剤の開発)

    南山堂  2013 

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    Total pages:7   Language:Japanese Book type:Textbook, survey, introduction

  3. 細胞周期フロンティア Reviewed

    廣川 高久, 島田 緑, 竹山 廣光, 中西 真( Role: Joint author ,  細胞老化とチェックポイント)

    共立出版  2010 

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    Total pages:5   Language:Japanese Book type:Textbook, survey, introduction

MISC 19

  1. Impact of FKBP52 on cell proliferation and hormone-dependent cancers. Invited Reviewed

    Hanaki S, Shimada M.

    Cancer Sci.   Vol. 114 ( 7 ) page: 2729 - 2738   2023.7

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    Authorship:Last author   Language:English   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    DOI: 10.1111/cas.15811.

  2. みにれびゅう「ER陽性乳がんの新規治療法開発に向けたエストロゲン受容体制御メカニズムの解明」 Reviewed

    羽原 誠, 島田 緑

    生化学(日本生化学会)   Vol. 95   page: 546 - 550   2023

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

  3. Estrogen receptor α revised: Expression, structure, function, and stability. Invited Reviewed

    Habara M, Shimada M.

    Bioessays.   Vol. 44 ( 12 ) page: e2200148   2022.12

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    Authorship:Last author   Language:English   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    DOI: 10.1002/bies.202200148

  4. Decoding the Phosphatase Code: Regulation of Cell Proliferation by Calcineurin. Invited Reviewed

    Masaki T, Shimada M.

    Int J Mol Sci.   Vol. 23 ( 3 ) page: 1122   2022.1

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    Authorship:Last author   Language:English   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    DOI: 10.3390/ijms23031122.

  5. Targeting EZH2 as cancer therapy. Invited Reviewed

    Hanaki S, Shimada M.

    J Biochem.   Vol. 170 ( 1 ) page: 1 - 4   2021.9

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    Language:English   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    DOI: 10.1093/jb/mvab007.

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KAKENHI (Grants-in-Aid for Scientific Research) 2

  1. Gene expression by the three-dimensional histone code

    Grant number:24K02227  2024.4 - 2027.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Authorship:Principal investigator 

    Grant amount:\18590000 ( Direct Cost: \14300000 、 Indirect Cost:\4290000 )

  2. Decoding the histone code through higher-order structure

    Grant number:21H02403  2021.4 - 2024.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Shimada Midori

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    Authorship:Principal investigator 

    Grant amount:\17290000 ( Direct Cost: \13300000 、 Indirect Cost:\3990000 )

    FKBP52 (FK506 Binding Protein 52) was identified as a poor prognostic factor for breast cancer. FKBP52 is a proline isomerase that isomerizes proline into cis and trans forms. It was found that FKBP52 enhances the function of estrogen receptor alpha (ERα), which is closely related to the malignant transformation of breast cancer. Of note, FKBP52 inhibition markedly inhibited breast cancer cell growth and destabilized ERα against endocrine treatment-resistant breast cancer cell lines, inhibiting their proliferation. Further analysis revealed that FKBP52 activates the expression of genes that promote proliferation via histone modifications.