Fibroblasts Close a Void in Free Space by a Purse-String Mechanism

成纤维细胞 细胞生物学 细胞外基质 伤口愈合 材料科学 缝隙连接 伤口闭合 间质细胞 生物 生物物理学 解剖 细胞内 细胞培养 免疫学 癌症研究 遗传学
作者
Avelino Dos Santos Da Costa,Ramesh Subbiah,Seung Ja Oh,Hyuntae Jeong,Jung‐Im Na,Kwideok Park,In‐Suk Choi,Jennifer H. Shin
出处
期刊:ACS Applied Materials & Interfaces [American Chemical Society]
卷期号:14 (36): 40522-40534 被引量:3
标识
DOI:10.1021/acsami.2c07952
摘要

The mechanism by which stromal cells fill voids in injured tissue remains a fundamental question in regenerative medicine. While it is well-established that fibroblasts fill voids by depositing extracellular matrix (ECM) proteins as they migrate toward the wound site, little is known about their ability to adopt an epithelial-like purse-string behavior. To investigate fibroblast behavior during gap closure, we created an artificial wound with a large void space. We discovered that fibroblasts could form a free-standing bridge over deep microvoids, closing the void via purse-string contraction, a mechanism previously thought to be unique to epithelial wound closure. The findings also revealed that myosin II mediated contractility and intercellular adherent junctions were required for the closure of the fibroblast gap in our fabricated three-dimensional artificial wound. To fulfill their repair function under the specific microenvironmental conditions of wounds, fibroblasts appeared to acquire the structural features of epithelial cells, namely, contractile actin bundles that span over multiple cells along the boundary. These findings shed light on a novel mechanism by which stromal cells bridge the 3D gap during physiological processes such as morphogenesis and wound healing.
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