肝臓のホメオスタシスは,ミドルボラールゾーン2の肝細胞によって維持される
Yonglong Wei1, Yunguan G Wang1,2, Yuemeng Jia1
1Children's Research Institute, Departments of Pediatrics and Internal Medicine, Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
まとめ
肝細胞は肝臓の再生とホメオスタシスの鍵です 損傷から保護されたこれらの細胞は,IGFBP2-mTOR-CCND1経路を通して肝臓の再生を促します.
科学分野:
- ヘパトロジー
- 細胞生物学
- 再生医療
背景:
- 肝臓の葉はゾーンに分けられ,肝細胞は様々な代謝酵素を発現します.
- 肝臓の再生と再生を担う特定の肝臓細胞のサブセットは完全に理解されていません.
- 以前の運命マッピング研究は,限られた肝細胞集団のみを調査した.
研究 の 目的:
- 肝臓のホメオスタシスと再生に対する異なる肝臓細胞サブセットの貢献を体系的に比較する.
- 肝細胞の細胞起源を 正常な循環と損傷後に特定する.
主な方法:
- 14種類のマウスの運命マッピングを活用した.
- ホメオスタシスと再生中の肝細胞サブセットの行動を体系的に分析した.
- 特定のゾーンからの再定住を 誘導する分子経路を調査した
主要な成果:
- ホメオスタシスでは,ゾーン1とゾーン3の肝細胞は減少し,ゾーン2の肝細胞は増加した.
- 損傷から保護されたゾーン2の肝細胞は,周心部と周門部の両方の損傷後の再生に有意に寄与しました.
- ゾーン2からの再増殖は,ラパミシン- サイクリンD1 (IGFBP2- mTOR- CCND1) 軸のインスリン類似成長因子結合タンパク質2メカニズム標的によって媒介された.
結論:
- 肝臓の葉の異なる領域は,肝細胞の周回に異なる貢献を示します.
- ゾーン2の肝細胞は,ホメオスタシスと肝臓再生の両方で新しい肝細胞の重要な源です.
- IGFBP2-mTOR-CCND1軸は,ゾーン2の肝細胞媒介による肝臓の再定着の重要な要因である.
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