トールのような受容体3は,保存されたカルシフィケーションのメカニズムを通じて大動脈狭窄を媒介する
Can Gollmann-Tepeköylü1, Michael Graber1, Jakob Hirsch1
1Department of Cardiac Surgery (C.G.-T., M.G, J.H., S.M., L.P., F.N., E.K., N.F., D. Lobenwein, V.S., J.E., M.G., J.H.), Medical University of Innsbruck, Austria.
Circulation
|April 4, 2023
まとめ
トール型受容体3 (TLR3) は,大動脈弁の化を調節する. ビグリカン (BGN) はTLR3を活性化させ,弁細胞の骨形成を促進し,動脈弁疾患 (CAVD) に寄与する.
科学分野:
- 分子生物学と免疫学
- 心血管研究
- 骨格生物学
背景:
- カルシフ性大動脈弁疾患 (CAVD) は,弁間細胞が骨を形成する細胞に変容することを含む.
- トール型受容体 (TLR) は,先天的な免疫と組織修復の鍵です.
- I型インターフェロン (IFN) は抗ウイルス反応と骨形成に不可欠です.
研究 の 目的:
- 大動脈弁の内生的なTLR3リガンドが,タイプIのIFNシグナル伝達によって,骨質細胞のような細胞生成を促進するかどうかを調査する.
- TLR3,IFN,CAVDの病原性を結びつける分子メカニズムを特定する.
主な方法:
- 人間の弁間細胞は,機械的ストレスまたはTLR3アゴニストで刺激された.
- 遺伝子発現,IFNシグナル伝達,骨形成を分析し,阻害剤は経路を明らかにした.
- シリコモデリングと免疫降水で,リガンド受容体相互作用が確認された.ノックアウトマウスとゼブラフィッシュモデルが使用された.ヒトコホート (GERA,UK Biobank) が遺伝子関連性のために分析された.
主要な成果:
- TLR3はバルブカルシフィケーションの重要なレギュラーとして特定されました.
- ビグリカン (BGN) は内生TLR3アゴニストとして発見され,活性化にはキシロシルトランスフェラーゼ1 (XYLT1) によって翻訳後の成熟が必要であった.
- BGNは,TLR3依存型I型IFNシグナル伝達によって,弁間細胞の骨格細胞変異を誘導した.BGN,Tlr3およびIfnar1欠乏したマウスは,CAVDおよび骨形成障害に対する保護を示した. XYLT1- BGN- TLR3- IFNAR1経路の遺伝的変異は,ヒトコホートにおけるCAVDと関連していた.
結論:
- ビグリカン (BGN) -TLR3-IFNAR1軸は,大動脈弁の化を調節する進化的に保存された経路である.
- この経路は,CAVDを予防するための潜在的な治療目標です.
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