title: Ultraviolet-A and -B differentially modify the tyrosine-kinase profile of human keratinocytes and induce the expression of Arg+.
abstract: To investigate the expression profile of protein tyrosine kinases (PTKs) in normal human epidermal keratinocytes (NHEK) in response to UVA and UVB we employed a reversed transcriptase polymerase chain reaction (PCR) approach using degenerate primers derived from the conserved catalytic domain of PTKs. Quantitative real-time PCR with specific primers was used to confirm the influence of UV on the expression of the identified PTKs. Arg (Abelson-related gene, Abl2) was the PTK with the highest prevalence (30% of all PTKs) and UVA led to a further induction of Arg expression reaching nine-fold mRNA baseline expression at 17 h after irradiation. UVB was followed by an initial downregulation and a subsequent increase in Arg mRNA reaching five-fold baseline levels after 24 h. We conclude that UVA and UVB differentially modify the expression of PTKs in NHEK, and that Arg appears to have a major role in the response of keratinocytes to UV. These results provide a basis for further studies of PTK in UV-induced signaling that regulates protective responses, cell growth and carcinogenesis in the skin.
authors.affiliation: Department of Dermatology, Medical University of Vienna, Vienna, Austria.
authors.forename: Gabriele
authors.initials: G
authors.lastname: Klosner
authors.forename: Roland
authors.initials: R
authors.lastname: Varecka
authors.forename: Robert
authors.initials: R
authors.lastname: Knobler
authors.forename: Franz
authors.initials: F
authors.lastname: Trautinger
mesh_terms: D020134:Catalytic Domain; D002478:Cells, Cultured; D006801:Humans; D015603:Keratinocytes / Q000187:drug effects* / Q000201:enzymology; D016133:Polymerase Chain Reaction; D011505:Protein-Tyrosine Kinases / Q000737:chemistry / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics; D014466:Ultraviolet Rays
chemical_list: D012333:RNA, Messenger; D011505:Protein-Tyrosine Kinases