IGFBP-5/TGF-β1媒介による内皮細胞と管状上皮細胞の交響は,インタースティシャル線維症を促進する
Shuqiang Wang1,2, Chengcheng Song3,1, Kun Chi1
1Department of Nephrology, First Medical Center of Chinese PLA General Hospital, Nephrology Institute of the Chinese People's Liberation Army, National Key Laboratory of Kidney Diseases, National Clinical Research Center for Kidney Diseases, Beijing Key Laboratory of Kidney Disease Research, Beijing, China.
まとめ
インスリン類似成長因子結合タンパク質5 (IGFBP-5) は,内皮細胞と管状上皮細胞の間のTGF-β1との自己増強のクロストークを通じて腎臓線維症を誘導する. 慢性腎臓病 (CKD) の治療戦略として,IGFBP-5をターゲットにすることが可能である.
科学分野:
- 腎臓科
- 細胞生物学
- 分子生物学
背景:
- 腎繊維症は慢性腎疾患 (CKD) の特徴であり,そのメカニズムは完全に理解されていません.
- インスリン類似成長因子結合タンパク質5 (IGFBP-5) は,糖尿病性腎臓疾患における炎症を促進することが以前示されました.
研究 の 目的:
- IGFBP-5が腎臓線維形成における役割を明らかにする.
- 腎繊維症における内皮細胞 (ECs) と管状上皮細胞 (TECs) の交響を調査する.
主な方法:
- ヒト細胞系 (HK-2,HUVEC) と共培養システムを使用した.
- 単面性尿路阻害 (UUO) とアリストロヒン酸腎不全 (ANN) を含むマウスモデルを使用した.
- IGFBP-5,TGF-β1,および線維症マーカーの評価表現
主要な成果:
- 血清のIGFBP-5濃度の上昇がCKD患者で観察されました.
- ネズミのIGFBP-5弱化した腎繊維症の遺伝的消去.
- 内皮特異的なIGFBP-5の消去は,TGF-β1/Smad3経路を抑制し,線維症を遅らせました.
- 内皮由来のIGFBP-5は,AKT/TGF-β1/Smad3によるTECのプロフィブロティックな変化を誘導した.
- TGF-β1は,ERK経由でEC IGFBP-5の産生を刺激し,フィードバックループを形成した.
結論:
- 相互のIGFBP-5/TGF-β1シグナリングが介在する新しいEC-TECクロスストーク軸は腎繊維症を誘発する.
- IGFBP-5は,線維生成の重要な要因として特定されています.
- IGFBP-5はCKDにおける腎繊維症を抑制する潜在的な治療標的である.
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