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What is the role of incretin and its degrading enzyme in the pathology of pulmonary hypertension?

Research Project

Project/Area Number 20K16885
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 52050:Embryonic medicine and pediatrics-related
Research InstitutionTokyo Medical and Dental University

Principal Investigator

Hosokawa Susumu  東京医科歯科大学, 大学院医歯学総合研究科, 非常勤講師 (00737025)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords肺高血圧症 / DPP-4阻害薬 / GLP-1受容体作動薬 / caveolin-1 / DPP-4 / GLP-1
Outline of Research at the Start

本研究では、肺高血圧症と炎症との関連に注目し研究を進める。
特に、インスリン分泌促進(インクレチン)ホルモンであるGLP-1 (glucagon-like peptide-1)、およびその分解酵素ジペプチジルペプチダーゼ4 (DPP-4)の肺高血圧症の病態に果たす役割を以下のように検討する。
(1)DPP-4の肺血管リモデリング促進作用(蛋白分解酵素/非蛋白分解酵素としての機能解析)
(2)GLP-1の肺血管リモデリング抑制作用(GLP-1依存性/非依存性シグナル伝達経路の解明)
肺血管リモデリングにおける炎症の関与について明らかにし、肺高血圧症の新規治療薬の開発を目標とする。

Outline of Final Research Achievements

In this study, we investigated the role of GLP-1, which is insulin-stimulating hormone, and DPP-4, which is degrading enzyme, in the pathology of pulmonary hypertension.
In rats with monocrotaline-induced pulmonary hypertension, GLP-1 receptor agonist liraglutide , DPP-4 inhibitor alogliptin, or their combination improved pulmonary hypertension and increased survival rates. As for the mechanism, it was revealed that DPP-4 inhibitor suppresses the inflammatory pathway mediated by NF-kB in pulmonary artery smooth muscle cells through its proteolytic enzyme function. Furthermore, DPP-4 was suggested to be involved in pulmonary artery smooth muscle cell proliferation as T cell activation antigen CD26. On the other hand, regarding GLP-1 receptor agonists, real-time PCR results suggested the involvement of tissue factor.

Academic Significance and Societal Importance of the Research Achievements

肺動脈性肺高血圧症のこれまでの治療は3系統(プロスタサイクリン、エンドセリン、一酸化窒素)が用いられ、いずれも血管拡張作用が主であり、新規治療薬の開発が求められている。本研究では、2型糖尿病治療薬が肺高血圧症動物モデルを改善すること、その機序が炎症に関与するシグナル伝達経路を抑制することで肺血管リモデリングを軽減することを明らかにした。肺高血症の新規治療薬の開発へ向けて、多大な貢献をもたらすものと考える。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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