2021 Fiscal Year Final Research Report
Elucidation of the mechanisms involved in the establishment of the basis for the development of trigger-based AF
Project/Area Number |
20K22924
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Research Category |
Grant-in-Aid for Research Activity Start-up
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Allocation Type | Multi-year Fund |
Review Section |
0903:Organ-based internal medicine and related fields
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Research Institution | Toho University |
Principal Investigator |
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Project Period (FY) |
2020-09-11 – 2022-03-31
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Keywords | 心房細動 / トリガー / 慢性容量負荷 / アルドステロン |
Outline of Final Research Achievements |
We have shown that chronically administered aldosterone increases the incidence of premature atrial contraction and markedly prolongs the duration of atrial fibrillation in the rat with aorto-venocaval shunt. The transient receptor canonical (TRPC) 3 channel inhibitor and indirect nuclear factor of activated T cells (NFAT) inhibitor inhibited the increase in heart weight and shortening of the atrial fibrillation cycle length observed in this rat model, while only TRPC3 channel inhibitor suppressed the occurrence of premature atrial contraction. These results suggest that TRPC3 channels and TRPC3 channel-mediated intracellular responses other than NFAT signaling may be involved in the development of triggering in the atria of this rat model.
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Free Research Field |
医歯薬学
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Academic Significance and Societal Importance of the Research Achievements |
近年提唱されたtrigger-based atrial fibrillation (AF)は、従来の考えであるリエントリーを中心とした不整脈発生基盤と異なる性質を持ち、難治性に位置付けられている。本研究は独自開発したtrigger-based AFに類似した性質を有する心房細動モデルラットを用いて、不整脈発生の基盤構築に関わるメカニズムを解明することを目的とした。本研究により、TRPC3チャネルを介した細胞内シグナルが、本モデルラット心房におけるトリガーの発生に関与する示唆を得た。この成果は、難治性心房細動に対する新たな治療戦略確立への展開が期待でき、学術的・社会的に意義のあるものである。
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