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Elucidation of the mechanism of acceleration of fibrosis progression in coinfection with hepatitis B and C viruses

Research Project

Project/Area Number 22K16042
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 53010:Gastroenterology-related
Research InstitutionOsaka University

Principal Investigator

Murai Kazuhiro  大阪大学, 医学部附属病院, 特任助教(常勤) (50867314)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2022: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
KeywordsB型肝炎 / single RNA sequence / 核酸アナログ製剤 / 肝細胞癌 / プロテオーム解析 / HBV / HCV / 共感染 / scRNAseq / ヒト肝細胞キメラマウス / ISG / single cell RNA sequence / 星細胞
Outline of Research at the Start

B型肝炎ウイルス(HBV)・C型肝炎ウイルス(HCV)共感染患者では、HBV単独感染患者、HCV単独感染患者と比して、肝硬変や肝発癌に至る割合が高く、予後が悪いと報告されているが、その機序は未だ明らかでない。そこで本研究では、PHH、ヒト化肝細胞キメラマウスにおけるHBV・HCV共感染モデルを用いて、single cell RNA sequenceなどの解析を用いることにより肝線維化進展が加速する機序の候補遺伝子を抽出する。抽出された候補遺伝子を、PHH・星細胞共培養実験やヒト肝細胞キメラマウスでsiRNAによる介入を行うことにより検証し、肝線維化進展が加速する機序の解明を目指す。

Outline of Final Research Achievements

Five genes differentially expressed in primary cultured human hepatocytes (PHH) between HBV RNA positive and negative cells were extracted. The five genes were not consistent with genes differentially expressed between HCV-infected and uninfected hepatocytes in liver tissue from hepatitis C virus (HCV)-infected humanized liver chimeric mice, or with genes whose expression was elevated in clusters observed in hepatectomy samples from HBV patients. Exosomes were extracted from sera of chronic hepatitis B patients treated with nucleos(t)ide analogs and proteomic analysis was performed. Proteins with altered expression in hepatocellular carcinoma and nonhepatocellular carcinoma cases were extracted, and one gene (CLU) was identified that overlaps with five genes with altered expression in HBV RNA positive and negative cells of HBV infected PHH.

Academic Significance and Societal Importance of the Research Achievements

B型肝炎ウイルス(HBV)は核酸アナログ製剤により血中のHBV DNAは抑制され、肝発癌・線維化進展が抑制されるが一部の症例では肝発癌・線維化進展を認める。B型慢性肝炎症例における肝発癌・線維化進展の機序解明や新規予測マーカーの開発が重要である。本研究ではC型肝炎ウイルス共感染症例に着目して病態進展の機序解明や予測マーカーの発見を目指したが、B型肝炎モデル・C型肝炎モデルで共通した予測マーカーの同定はできなかった。しかしHBV感染初代培養ヒト肝細胞のRNA sequenceとB型慢性肝炎患者血清のプロテオーム解析で共通した候補遺伝子1つを同定し、今後の新規肝癌予測マーカー開発の一助となった。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (1 results)

All 2022

All Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] Single cell RNA sequence using the liver tissue derived from humanized liver chimeric mice infected hepatitis C virus2022

    • Author(s)
      Kazuhiro Murai, Hayato Hikita, Kumiko Shirai, Hiroshi Suemizu, Kunimaro Furuta, Takahiro Kodama, Ryotaro Sakamori, Tomohide Tatsumi, Tetsuo Takehara
    • Organizer
      The 6th International Workshop on Humanized Mice (IWHM6)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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Published: 2022-04-19   Modified: 2025-01-30  

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