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- W1995507968 abstract "Transforming growth factor beta 1 (TGF-beta1) upregulation has been implicated in hypertrophic scars and keloids, but it is unclear if it is the cause or an effect of excessive scar formation. In this study, we overexpressed TGF-beta1 in fibroblasts and characterized its role. Normal human dermal fibroblasts were genetically modified to overexpress TGF-beta1 as the wild-type latent molecule or as a mutant constitutively active molecule. TGF-beta1 secretion was measured, as were the effects of TGF-beta1 upregulation on cell proliferation, expression of smooth muscle cell alpha actin (SMC alpha-actin) and ability to contract collagen lattices. Fibroblasts were implanted intradermally into athymic mice and tissue formation was analyzed over time by histology and immunostaining. Gene-modified fibroblasts secreted approximately 20 times the TGF-beta1 released by control cells, but only cells expressing mutant TGF-beta1 secreted it in the active form. Fibroblasts expressing the active TGF-beta1 gene had increased levels of SMC alpha-actin and enhanced ability to contract a collagen lattice. After intradermal injection into athymic mice, only fibroblasts expressing active TGF-beta1 formed keloid-like nodules containing collagen, which persisted longer than implants of the other cell types. We conclude that upregulation of TGF-beta1 by fibroblasts may be necessary, but is not sufficient for excessive scarring. Needed are other signals to activate TGF-beta1 and prolong cell persistence." @default.
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- W1995507968 date "2006-05-01" @default.
- W1995507968 modified "2023-10-10" @default.
- W1995507968 title "Upregulation of TGF-β1 Expression May Be Necessary but Is Not Sufficient for Excessive Scarring" @default.
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- W1995507968 doi "https://doi.org/10.1038/sj.jid.5700200" @default.
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