title: RIP2: a novel player in the regulation of keratinocyte proliferation and cutaneous wound repair?
abstract: We could recently demonstrate an important role of receptor interacting protein 4 (RIP4) in the regulation of keratinocyte differentiation. Now, we analyzed a potential role of the RIP4 homolog RIP2 in keratinocytes. Specifically, we demonstrate here that rip2 expression is induced by scratch-wounding and after the induction of differentiation in these cells. Furthermore, serum growth factors and cytokines can induce rip2, with TNF-alpha-dependent induction being dependent on p38 MAPK. In addition, we demonstrate that scratch-induced upregulation of rip2 expression is completely blocked by the steroid dexamethasone. Since we also show that RIP2 is an important player in the regulation of keratinocyte proliferation, these data suggest that inhibition of rip2 upregulation after wounding might contribute to the reduced and delayed wound re-epithelialization phenotype seen in glucocorticoid-treated patients.
authors.affiliation: Charité-University Medicine Berlin, Institute of Physiology, Arnimallee 22, D-14195 Berlin, Germany.
authors.forename: Stephanie
authors.initials: S
authors.lastname: Adams
authors.forename: Ralitsa S
authors.initials: RS
authors.lastname: Valchanova
authors.forename: Barbara
authors.initials: B
authors.lastname: Munz
mesh_terms: D002454:Cell Differentiation / Q000502:physiology; D049109:Cell Proliferation; D002478:Cells, Cultured; D016207:Cytokines / Q000378:metabolism; D003907:Dexamethasone / Q000378:metabolism; D005938:Glucocorticoids / Q000378:metabolism; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000378:metabolism; D015603:Keratinocytes / Q000166:cytology / Q000502:physiology*; D053475:Receptor-Interacting Protein Serine-Threonine Kinase 2 / Q000235:genetics / Q000378:metabolism*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D014945:Wound Healing / Q000502:physiology*; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: D016207:Cytokines; D005938:Glucocorticoids; D036341:Intercellular Signaling Peptides and Proteins; D014409:Tumor Necrosis Factor-alpha; D003907:Dexamethasone; C506253:RIPK2 protein, human; D053475:Receptor-Interacting Protein Serine-Threonine Kinase 2; D048051:p38 Mitogen-Activated Protein Kinases