整合素连接激酶-磷脂酰肌醇-3激酶/蛋白激酶B信号通路通过调节成纤维细胞迁移及向肌成纤维细胞分化参与皮肤伤口收缩。

ILK-PI3K/AKT pathway participates in cutaneous wound contraction by regulating fibroblast migration and differentiation to myofibroblast.

作者信息

Li Gang, Li Ye-Yang, Sun Jing-En, Lin Wei-Hua, Zhou Ri-Xing

机构信息

Department of Burns and Plastic Surgery, Guangzhou Red Cross Hospital, The First Clinical College of Jinan University, Guangzhou, China.

出版信息

Lab Invest. 2016 Jul;96(7):741-51. doi: 10.1038/labinvest.2016.48. Epub 2016 Apr 25.

Abstract

The interactions between fibroblasts and the extracellular matrix in wound contraction are mainly mediated via integrin signaling. Integrin-linked kinase (ILK) is a key mediator in integrin signal transduction. We investigated the role of ILK in cutaneous wound contraction. We found that ILK was involved in cutaneous wound healing in rats, and ILK and PI3K/AKT inhibitors inhibited wound contraction and re-epithelialization, consequently delaying wound healing in vivo. Further, using in vitro studies, we demonstrated that ILK and PI3K/AKT inhibitors suppressed the contraction of fibroblast-populated collagen lattices, inhibited fibroblast migration, and interrupted the effect of TGF-β1 on promoting alpha smooth muscle actin (α-SMA) expression in fibroblasts. When ILK expression was directly blocked by ILK small interfering RNA transfection, the migration and α-SMA expression of normal dermal fibroblasts were significantly suppressed as well. The data suggest that the ILK-PI3K/AKT signaling pathway mediates cutaneous wound contraction by regulating fibroblast migration and differentiation to myofibroblasts.

摘要

在伤口收缩过程中,成纤维细胞与细胞外基质之间的相互作用主要通过整合素信号传导介导。整合素连接激酶(ILK)是整合素信号转导中的关键介质。我们研究了ILK在皮肤伤口收缩中的作用。我们发现ILK参与大鼠皮肤伤口愈合,并且ILK和PI3K/AKT抑制剂抑制伤口收缩和再上皮化,从而在体内延迟伤口愈合。此外,通过体外研究,我们证明ILK和PI3K/AKT抑制剂抑制成纤维细胞填充的胶原晶格收缩,抑制成纤维细胞迁移,并阻断TGF-β1对促进成纤维细胞中α平滑肌肌动蛋白(α-SMA)表达的作用。当通过ILK小干扰RNA转染直接阻断ILK表达时,正常真皮成纤维细胞的迁移和α-SMA表达也被显著抑制。数据表明,ILK-PI3K/AKT信号通路通过调节成纤维细胞迁移和向肌成纤维细胞分化来介导皮肤伤口收缩。

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