Study summary · research use only
The activin binding proteins follistatin and follistatin-related protein are differentially regulated in vitro and during cutaneous wound repair
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
This mouse study examined follistatin-related gene (FLRG) protein, comparing it to follistatin, another activin-binding protein. The authors found FLRG mRNA was expressed at high levels in lung, testis, uterus, and especially skin, with FLRG protein localized to the basement membrane between dermis and epidermis and around blood vessels. FLRG expression was reported to be induced in keratinocytes by keratinocyte growth factor, epidermal growth factor, and transforming growth factor-beta 1, and in fibroblasts by platelet-derived growth factor and epidermal growth factor, with induction described as more rapid but weaker than for follistatin. Both proteins were expressed during wound healing but with different distribution patterns within the wound, which the authors suggested points to differing roles for the two proteins.
Abstract
Follistatin is a secreted protein that binds activin in vitro and in vivo and thereby inhibits its biological functions. Recently, related human and murine genes, designated follistatin-related gene (FLRG), were identified, and their products were shown to bind activin with high affinity. In this study we further characterized the murine FLRG protein, and we analyzed its tissue-specific expression and regulation in comparison with those of follistatin. Transient expression of the mouse FLRG protein in COS-1 cells revealed that the FLRG cDNA encodes a secreted glycoprotein. FLRG mRNA was expressed at high levels in the lung, the testis, the uterus and, particularly, the skin. Immunohistochemistry revealed the presence of FLRG in the basement membrane between the dermis and the epidermis and around blood vessels. FLRG mRNA expression was induced in keratinocytes by keratinocyte growth factor, epidermal growth factor and transforming growth factor-beta 1, and in fibroblasts by platelet-derived growth factor and epidermal growth factor. The induction was more rapid, but weaker, than that of follistatin. Most interestingly, both follistatin and FLRG were expressed during the wound healing process, but their distribution within the wound was different. The different expression pattern of FLRG and follistatin and their differential regulation suggest different functions of these activin-binding proteins in vivo.
pepmg summarizes the peer-reviewed literature and links to every source — it sells nothing, ships nothing, and gives no medical, dosing, or human-use guidance. Don't just trust this summary: follow the citation to its source and read it yourself. Research use only.