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Development of novel antifibrotic therpy for idiopathic pulmonary fibrosis via suppression of the activity of M2c-macrophages

Research Project

Project/Area Number 20K17234
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 53030:Respiratory medicine-related
Research InstitutionHyogo Medical University

Principal Investigator

Shibata Eisuke  兵庫医科大学, 医学部, 助教 (00774613)

Project Period (FY) 2020-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords特発性肺線維症 / M2マクロファージ / 線維化 / Hippo pathway / 転写共役因子 / M2cマクロファージ / M2c-マクロファージ / 抗線維化療法
Outline of Research at the Start

間質性肺炎(Interstitial Pneumonia: IP)、その中でも最も頻度の高い特発性肺線維症(Idiopathic Pulmonary fibrosis: IPF)は、診断後の生存期間中央値が35ヶ月と報告され、国の難病指定も受けている予後不良の難治性疾患である。疾患の発症原因は未だ不明だが、環境因子の影響による慢性炎症と繰り返す肺胞上皮の損傷がその原因と考えられている。本研究でIPFの予後と機能改善につながる治療標的可能分子を特定したいと考えている。

Outline of Final Research Achievements

Idiopathic pulmonary fibrosis (IPF) is chronic progressive disease and is difficult to treat. In the present study, we investigated the role of alternatively activated M2 macrophages which supposed to be a regulator of both inflammation and fibrosis. At first, we speculated that activation of transcriptional co-factor YAP/TAZ caused fibrosis through the induction of the expression of profibrotic genes such as CTGF and TGF-beta. According to our hypothesis, we differentiated THP-1 cells into macrophages by PMA thereafter stimulated them with various cytokines, and analyzed the expression of CTGF. However, induction of CTGF expression in THP-1-derived macrophages was not inhibited by knockdown of YAP/TAZ. Moreover, only low level of gene expression of YAP/TAZ was observed in them. These results suggested that macrophages were activated through the secretary factors from alveolar epithelial type II cells. We currently examined the expression of YAP/TAZ inducible genes in A549 cells.

Academic Significance and Societal Importance of the Research Achievements

IPFに対してはこれまで長きに渡りステロイドによる治療が行われてきたが、有害事象が必発な上、有用性を示唆する科学的根拠はなく、ステロイド治療に抵抗性である。その理由については分かっていないが、申請者はたとえ炎症は抑える事ができても、それに続く線維化を抑える事ができない事、すなわち、ステロイドによって誘導されるM2c-MΦが線維芽細胞を活性化させ、筋線維芽細胞の増殖を促進する事が理由の一つと考えている。Ⅱ型肺胞上皮細胞におけるYAP/TAZの不活化により、M2MΦを抑制し、「炎症」と「線維化」の両方を制御する事が可能となれば、IPF治療のbreakthroughとなると考えている。

Report

(3 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report

URL: 

Published: 2020-04-28   Modified: 2023-01-30  

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