title: Retinoic acid induces expression of PA-FABP (psoriasis-associated fatty acid-binding protein) gene in human skin in vivo but not in cultured skin cells.
abstract: PA-FABP (psoriasis-associated fatty acid-binding protein) is a new member of a group of low-molecular-weight proteins that are highly up-regulated in psoriatic skin and that share similarity to fatty acid-binding proteins. In this study we demonstrate that PA-FABP transcripts are expressed in human skin in vivo and that topical application of 0.05% retinoic acid (RA) cream results in a rapid induction of PA-FABP transcripts following treatment for 16 hours and persists at increasing levels after 48 and 96 h of RA treatment. The PA-FABP mRNA response to RA was reduced by approximately 50% when patients concurrently were treated with RA and 0.025% clobetasol propionate (CLO) for 48 and 96 h, whereas treatment with CLO alone resulted in PA-FABP transcript levels not significantly different from vehicle-treated skin. When comparing the effects of a well-known irritant, sodium lauryl sulfate (SLS), to those of RA and its vehicle, 0.05% RA cream but not 2% SLS in RA vehicle caused PA-FABP mRNA induction after 16 h. SLS treatment of human skin for 96 h caused a slight increase in PA-FABP transcripts, but markedly less than that observed in response to RA treatment. Incubation of cultured human keratinocytes or skin fibroblasts with RA for up to 48 h did not significantly induce PA-FABP transcripts. Expression of PA-FABP message in keratinocytes was observed to be induced by calcium and fetal calf serum (FCS), while tetra-decanoyl phorbol acetate (TPA) caused little or no induction.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Dermatology, University of Michigan, Ann Arbor.
authors.forename: F G
authors.initials: FG
authors.lastname: Larsen
authors.forename: J J
authors.initials: JJ
authors.lastname: Voorhees
authors.forename: A
authors.initials: A
authors.lastname: Aström
mesh_terms: D001483:Base Sequence; D002352:Carrier Proteins / Q000235:genetics* / Q000378:metabolism; D002478:Cells, Cultured; D002990:Clobetasol / Q000031:analogs & derivatives / Q000494:pharmacology; D000071438:Fatty Acid-Binding Protein 7; D050556:Fatty Acid-Binding Proteins; D015870:Gene Expression / Q000187:drug effects*; D006801:Humans; D015603:Keratinocytes / Q000378:metabolism; D015335:Molecular Probes / Q000235:genetics; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins; D011565:Psoriasis / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D012867:Skin / Q000166:cytology / Q000378:metabolism; D012879:Skin Physiological Phenomena; D012967:Sodium Dodecyl Sulfate / Q000494:pharmacology; D014018:Tissue Distribution; D014212:Tretinoin / Q000494:pharmacology*; D025521:Tumor Suppressor Proteins
chemical_list: D002352:Carrier Proteins; C107608:FABP7 protein, human; D000071438:Fatty Acid-Binding Protein 7; D050556:Fatty Acid-Binding Proteins; D015335:Molecular Probes; D009363:Neoplasm Proteins; D012333:RNA, Messenger; D025521:Tumor Suppressor Proteins; D012967:Sodium Dodecyl Sulfate; D014212:Tretinoin; D002990:Clobetasol