フーマレートはmtDNAの膀の放出を誘導し,先天的免疫を駆動する

Vincent Zecchini¹, Vincent Paupe², Irene Herranz-Montoya^1,3

¹Medical Research Council Cancer Unit, University of Cambridge, Cambridge, UK.

Nature

|March 8, 2023

まとめ

ミトコンドリアDNAを放出することで早期の腎細胞炎症を引き起こします. この先天的な免疫反応は,フーマレート蓄積とミトコンドリアの変化によって媒介されます.

科学分野:

細胞生物学
分子生物学
腫瘍学

背景:

フーマレート水素酵素 (FH) の変異は,遺伝性線維腫と腎臓細胞癌と関連しています.
FHが腎臓に失われると,フーマレート蓄積による腫瘍性シグナル伝達が起こりますが,急性反応は不明です.

研究の目的:

腎臓におけるフーマレートヒドラテーズ喪失に対する急性細胞反応を調査する.
FH欠乏性腎臓細胞がんの発症の初期段階にある分子メカニズムを解明する.

主な方法:

腎臓におけるFH喪失の年代順を研究するための誘導可能なマウスモデルの生成
ミトコンドリアの形態,ミトコンドリアDNAの放出,および先天的な免疫経路の活性化 (cGAS-STING-TBK1,RIG-I) の分析.
フマラートの役割とミトコンドリア派生小胞の関与と sorting nexin 9 (SNX9) の調査.

主要な成果:

FHの喪失はミトコンドリアの形態を急速に変化させ,ミトコンドリアDNA (mtDNA) を細胞溶液に放出する.
細胞性mtDNAはcGAS-STING-TBK1とRIG-Iの先天性免疫経路を活性化し,炎症を誘発する.
フーマレートは,SNX9に依存したミトコンドリア派生小胞を通してこの反応を媒介する.

結論:

急性FH喪失は,フマレート誘発によるmtDNA放出によって腎臓細胞の先天的な免疫反応を誘発する.
この研究は,腎臓細胞がんの病原性における代謝機能障害と免疫活性化を結びつける新しいメカニズムを明らかにした.
フーマレート蓄積やミトコンドリア動態をターゲットにすることで,FHに関連する癌の治療戦略を提供することができる.

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