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生长因子和机械调节的细胞外基质的相互交流调节角膜细胞-成纤维细胞/肌成纤维细胞的转化。

Growth factors and mechano-regulated reciprocal crosstalk with extracellular matrix tune the keratocyte-fibroblast/myofibroblast transition.

机构信息

Laboratory of Applied Mechanobiology, Department of Health Sciences and Technology, ETH Zurich, Vladimir-Prelog-Weg 4, 8093, Zurich, Switzerland.

Ophthalmology Section, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, 8057, Zurich, Switzerland.

出版信息

Sci Rep. 2023 Jul 13;13(1):11350. doi: 10.1038/s41598-023-37776-9.

Abstract

Improper healing of the cornea after injury, infections or surgery can lead to corneal scar formation, which is associated with the transition of resident corneal keratocytes into activated fibroblasts and myofibroblasts (K-F/M). Myofibroblasts can create an extracellular matrix (ECM) niche in which fibrosis is promoted and perpetuated, resulting in progressive tissue opacification and vision loss. As a reversion back to quiescent keratocytes is essential to restore corneal transparency after injury, we characterized how growth factors with demonstrated profibrotic effects (PDGF, FGF, FBS, TGFβ1) induce the K-F/M transition, and whether their withdrawal can revert it. Indeed, the upregulated expression of αSMA and the associated changes in cytoskeletal architecture correlated with increases in cell contractility, fibronectin (Fn) and collagen matrix density and Fn fiber strain, as revealed by 2D cell culture, nanopillar cellular force mapping and a FRET-labeled Fn tension probe. Substrate mechanosensing drove a more complete K-F/M transition reversal following growth factor withdrawal on nanopillar arrays than on planar glass substrates. Using decellularized ECM scaffolds, we demonstrated that the K-F/M transition was inhibited in keratocytes reseeded onto myofibroblast-assembled, and/or collagen-1-rich ECM. This supports the presence of a myofibroblast-derived ECM niche that contains cues favoring tissue homeostasis rather than fibrosis.

摘要

角膜受伤、感染或手术后愈合不当,可导致角膜瘢痕形成,这与角膜常驻细胞(角膜基质细胞)向激活的成纤维细胞和肌成纤维细胞(K-F/M)转化有关。肌成纤维细胞可在细胞外基质(ECM)龛中产生,促进和维持纤维化,导致组织逐渐混浊和视力丧失。由于受伤后恢复角膜透明性必须使细胞回到静止状态,我们研究了具有明显促纤维化作用的生长因子(PDGF、FGF、FBS、TGFβ1)如何诱导 K-F/M 转化,以及它们的撤出是否可以逆转这一过程。事实上,αSMA 的上调表达以及细胞骨架结构的相关变化与细胞收缩力、纤维连接蛋白(Fn)和胶原基质密度以及 Fn 纤维应变的增加相关,这可以通过 2D 细胞培养、纳米柱细胞力映射和 FRET 标记的 Fn 张力探针来揭示。在纳米柱阵列上,与在平面玻璃基底上相比,生长因子撤出后,基质机械敏感性驱动了更完整的 K-F/M 转化逆转。使用去细胞化 ECM 支架,我们证明了在重新接种到肌成纤维细胞组装的和/或富含胶原-1 的 ECM 上的角膜基质细胞中,K-F/M 转化受到抑制。这支持存在肌成纤维细胞衍生的 ECM 龛,其中包含有利于组织内稳态而不是纤维化的线索。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a636/10345140/2d1dead8f1c0/41598_2023_37776_Fig1_HTML.jpg

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