Regulation of the expression of stromelysin-2 by growth factors in keratinocytes: implications for normal and impaired wound healing.
Keratinocyte growth factor (KGF) has been implicated in wound re-epithelialization and branching morphogenesis of several organs. To determine whether KGF induces these effects via induction of matrix metalloproteinase expression we have analysed the effect of KGF on the expression of stromelysin-2 in cultured HaCaT keratinocytes. Here we show a strong induction of stromelysin-2 mRNA within 5-8 h of stimulation of these cells with KGF. The degree of induction was similar to that achieved by treatment with epidermal growth factor or tumour necrosis factor alpha, whereas the stimulatory effect of transforming growth factor beta 1 was even stronger. To determine whether the induction of stromelysin-2 expression by growth factors and cytokines might be important for wound healing, we analysed the expression of this gene during the healing process of full-thickness excisional wounds in mice. Whereas stromelysin-2 mRNA could hardly be detected in unwounded skin, a biphasic induction was seen after injury and highest levels were found at days 1 and 5 after wounding. Hybridization in situ revealed the presence of stromelysin-2 mRNA in basal keratinocytes at the wound edge but not in the underlying mesenchymal tissue. During impaired wound healing as seen in glucocorticoid-treated mice, stromelysin-2 expression was significantly increased compared with untreated control mice. Taken together, these results suggest that correct regulation of this broad-spectrum metalloproteinase might be important for normal repair.
Madlener
M
M
Max-Planck-Institut für Biochemie, Martinsried, Federal Republic of Germany.
Mauch
C
C
Conca
W
W
Brauchle
M
M
Parks
W C
WC
Werner
S
S
D000818:Animals; D002478:Cells, Cultured; D005260:Female; D051526:Fibroblast Growth Factor 10; D051523:Fibroblast Growth Factor 7; D005346:Fibroblast Growth Factors; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D005938:Glucocorticoids / Q000494:pharmacology; D006133:Growth Substances / Q000494:pharmacology*; D006801:Humans; D017403:In Situ Hybridization; D015603:Keratinocytes / Q000201:enzymology* / Q000502:physiology; D053506:Matrix Metalloproteinase 10; D008666:Metalloendopeptidases / Q000096:biosynthesis*; D051379:Mice; D008807:Mice, Inbred BALB C; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000096:biosynthesis; D012867:Skin / Q000201:enzymology; D014158:Transcription, Genetic / Q000187:drug effects; D014945:Wound Healing / Q000187:drug effects; D014947:Wounds and Injuries / Q000201:enzymology / Q000503:physiopathology*
C496453:FGF7 protein, human; C496454:Fgf7 protein, mouse; D051526:Fibroblast Growth Factor 10; D005938:Glucocorticoids; D006133:Growth Substances; D012333:RNA, Messenger; D051523:Fibroblast Growth Factor 7; D005346:Fibroblast Growth Factors; D008666:Metalloendopeptidases; D053506:Matrix Metalloproteinase 10