title: Resveratrol regulates p66Shc activation in HaCaT cells.
abstract: Skin is exposed to both endogenous and environmental oxidant agents, leading to the harmful generation of reactive oxygen species. Particular interest has been pointed on plant antioxidants, such as resveratrol, because of their wide-ranging biological activity and clinical potential. Resveratrol exerts antioxidant, metabolism-regulating and pro-apoptotic/anti-cancer effects on a variety of experimental models and has been suggested to protect skin from ultraviolet-induced photodamaging and photoaging. In parallel, also the biological significance of p66Shc, a member of the Src Homologue and Collagene homologue family with redox activity, is getting further attention. Because of the striking intersection among the activities of resveratrol with those of p66Shc, we investigated whether resveratrol would activate p66Shc in human immortalised keratinocytes (HaCaT cells), a well known and largely used model for skin keratinocytes. HaCaT cells were treated with resveratrol (10-150 μm) for different times. The effect of resveratrol on the proliferation of HaCaT cells and the activation of ERK1/2, AKT, and p66Shc was investigated by cell counting, fluorescence-activated cell sorting, and western blot analysis of total or immunoprecipitated cell extracts. In HaCaT cells, resveratrol induces dose- and time-dependent growth arrest, p66Shc-Ser36 phosphorylation, ERK1/2 phosphorylation and AKT dephosphorylation. Finally, we showed that resveratrol-induced p66Shc-Ser36 phosphorylation is dependent on ERK1/2 activation. Interestingly, these resveratrol-induced molecular effects were associated with reduced adhesion and reversible growth arrest rather than cell death pathways. This is the first evidence linking resveratrol with p66Shc and suggests that p66Shc may contribute to the effect of resveratrol on cell proliferation and function in the outermost layer of the skin.
authors.affiliation: Department of Systematic Pathology, University of Naples Federico II, Naples, Italy.
authors.forename: Gabriella
authors.initials: G
authors.lastname: Fabbrocini
authors.forename: Annamaria
authors.initials: A
authors.lastname: Kisslinger
authors.forename: Paola
authors.initials: P
authors.lastname: Iannelli
authors.forename: Nicoletta
authors.initials: N
authors.lastname: Vitale
authors.forename: Claudio
authors.initials: C
authors.lastname: Procaccini
authors.forename: Giuseppina
authors.initials: G
authors.lastname: Sparaneo
authors.forename: Paolo
authors.initials: P
authors.lastname: Chieffi
authors.forename: Fabio
authors.initials: F
authors.lastname: Ayala
authors.forename: Francesco Paolo
authors.initials: FP
authors.lastname: Mancini
authors.forename: Donatella
authors.initials: D
authors.lastname: Tramontano
mesh_terms: D000975:Antioxidants / Q000494:pharmacology*; D002070:Butadienes / Q000494:pharmacology; D016923:Cell Death / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D002461:Cell Line, Transformed; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006801:Humans; D015603:Keratinocytes / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism*; D020935:MAP Kinase Signaling System / Q000187:drug effects*; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D009570:Nitriles / Q000494:pharmacology; D010766:Phosphorylation / Q000187:drug effects; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D000077185:Resveratrol; D055765:Shc Signaling Adaptor Proteins / Q000378:metabolism*; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; D013267:Stilbenes / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D002070:Butadienes; D004791:Enzyme Inhibitors; D009570:Nitriles; C528024:SHC1 protein, human; D055765:Shc Signaling Adaptor Proteins; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; D013267:Stilbenes; C113580:U 0126; D051057:Proto-Oncogene Proteins c-akt; C535150:MAPK1 protein, human; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D000077185:Resveratrol