Fibronectin growth factor-binding domains are required for fibroblast survival.

Fibronectin growth factor-binding domains are required for fibroblast survival.
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DOI:
10.1038/jid.2010.253
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发表时间:
2011-01
期刊:
The Journal of investigative dermatology
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其他
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纤维连接蛋白(FN)是胚胎发生、形态发生和创伤修复所必需的,其含Arg-Gly-Asp-central cell-binding domain(CCBD)对间充质细胞的存活和生长至关重要。在这里,我们证明,FN包含三个生长因子结合域(FN-GFBD),结合血小板衍生生长因子-BB(PDGF-BB),一个有效的成纤维细胞存活和促有丝分裂因子。这些位点以10-100 nm的解离常数结合PDGF-BB。在没有FN-GFBD的重组CCBD(FNIII 8 -11)上培养的无FN细胞表现出最小的代谢,并且在24小时时经历自噬,随后在72小时时凋亡,即使在PDGF-BB存在下也是如此。相比之下,接种在与FN-GFBD邻接的FNIII 8 -11上的FN-无效细胞在没有PDGF-BB的情况下存活,并且在有PDGF-BB的情况下增殖。FN-空细胞在FNIII 8 -11和FN-GFBD的非连续阵列上的存活需要这些结构域吸附在同一表面上,这表明存在间充质细胞-细胞外基质突触。因此,成纤维细胞存活需要在FN-GFBD存在下的GF刺激,以及通过CCBD粘附到FN。成纤维细胞存活依赖于FN-GFBD的发现强调了细胞周围基质对细胞存活的至关重要性,并且对皮肤伤口愈合和再生具有重要意义。
Fibronectin (FN) is required for embryogenesis, morphogenesis, and wound repair, and its Arg–Gly–Asp-containing central cell-binding domain (CCBD) is essential for mesenchymal cell survival and growth. Here, we demonstrate that FN contains three growth factor-binding domains (FN-GFBDs) that bind platelet-derived growth factor-BB (PDGF-BB), a potent fibroblast survival and mitogenic factor. These sites bind PDGF-BB with dissociation constants of 10–100 nm. FN-null cells cultured on recombinant CCBD (FNIII8–11) without a FN-GFBD demonstrated minimal metabolism and underwent autophagy at 24 hours, followed by apoptosis at 72 hours, even in the presence of PDGF-BB. In contrast, FN-null cells plated on FNIII8–11 contiguous with FN-GFBD survived without, and proliferated with, PDGF-BB. FN-null cell survival on FNIII8–11 and noncontiguous arrays of FN-GFBDs required these domains to be adsorbed on the same surface, suggesting the existence of a mesenchymal cell-extracellular matrix synapse. Thus, fibroblast survival required GF stimulation in the presence of a FN-GFBD, as well as adhesion to FN through the CCBD. The findings that fibroblast survival is dependent on FN-GFBD underscore the critical importance of pericellular matrix for cell survival and have significant implications for cutaneous wound healing and regeneration.
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