腸 - 肝軸は腸の幹細胞の適性を計測する

Girak Kim¹, Zuojia Chen¹, Jian Li¹

¹Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.

Cell

|January 27, 2024

まとめ

肝臓は,腸の幹細胞 (ISC) の増殖を制御するために,ピグメント上皮質由来因子 (PEDF) を産生する. 肝炎はPEDFを減少させ,腸の修復のためにISCの増殖を可能にします.

科学分野:

胃腸内科
ヘパトロジー
幹細胞生物学

背景:

腸肝軸は生理学的調節に不可欠ですが,腸内ホメオスタシスの役割は完全に理解されていません.
腸の幹細胞 (ISC) は腸組織の維持と修復に不可欠であり,複雑な信号伝達経路によって調節されます.
肝臓に由来する要因は腸の機能に影響し,臓器間のコミュニケーションの重要性を強調します.

研究の目的:

腸 - 肝軸が腸の生理を調節するメカニズムを明らかにし,特に腸の幹細胞の行動に焦点を当てた.
肝臓と腸のコミュニケーションに関与する重要な分子媒介者を特定する.
肝臓に由来する要因がISCの増殖と腸内安定にどのように影響するかを理解する.

主な方法:

肝臓と腸の相互作用を調査するためにマウスの肝切除術.
トランスクリプトミックとプロテオミックプロファイリングで重要なシグナル分子を特定する.
腸の幹細胞におけるWnt/β-カテニンの信号伝達経路の分析
ペロキソーム増殖器活性化受容体α (PPARα) アゴニストを用いた薬学的な操作.

主要な成果:

肝臓で分泌されるWnt阻害剤であるピグメント上皮質誘導因子 (PEDF) は,ISC増殖の主要な調節因子として特定されました.
PEDFはISCの過剰増殖を抑制し,Wnt/β-catenin経路を抑制することで腸内ホメオスタシスを維持する.
腸の炎症は肝臓に微生物の危険信号を感知させ,PPARα経由でPEDFの生成を減少させます.
減少したPEDFはISCの増殖を解放し,腸の組織修復を促進します.
PPARαアゴニストであるフェノフィブラートは,PEDFの活性を増強することで大腸炎の感受性を高めます.

結論:

ピグメント上皮質由来因子 (PEDF) は,ISCの膨張を制御することによって,腸内ホメオスタシスの維持に重要な役割を果たします.
肝臓は腸の炎症を感知し PEDFの産生を調節し腸の修復メカニズムに影響します
PEDFが介在する腸と肝臓の相互通信は,ISCの増殖と腸の健康を校正するために不可欠です.

キーワード:

PEDF について PPARα Wnt/β-カタニン信号フェノフィブラート腸肝軸腸の幹細胞

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