title: Effects of alpha-lipoic acid and dihydrolipoic acid on expression of proto-oncogene c-fos.
abstract: The transcription factor AP-1 is an important human mediator of the cellular response to serum, growth factors, and phorbol esters such as 12-O-tetradecanoyl-phorbol-13 acetate (TPA). The AP-1 complex consists of distinct protein heterodimers encoded by the proto-oncogene c-fos and c-jun mRNA whose gene expression can be induced by TPA, cyclic AMP and growth factors. Recent findings suggest an involvement of reactive oxygen species in the pathway of TPA and protein kinase C leading to expression of c-fos and c-jun mRNA. To investigate the role of reactive oxygen species we studied the effects of alpha-lipoic acid and dihydrolipoic acid (natural thiol antioxidants) on the expression of c-fos mRNA in human Jurkat T cells. When cells were preincubated with dihydrolipoic acid (0.2 mM) the expression of c-fos mRNA was suppressed at 30 min after stimulation of TPA (0.5 microM) whereas in the case of preincubation of alpha-lipoic acid (0.2 microM), the expression was enhanced at 30 min. These studies support the idea that superoxide anion radical plays a role in the expression of c-fos mRNA.
authors.affiliation: Department of Molecular and Cell Biology, University of California at Berkeley 94720.
authors.forename: M
authors.initials: M
authors.lastname: Mizuno
authors.forename: L
authors.initials: L
authors.lastname: Packer
mesh_terms: D001483:Base Sequence; D002460:Cell Line; D016384:Consensus Sequence; D004247:DNA / Q000235:genetics; D005786:Gene Expression Regulation / Q000187:drug effects; D016762:Genes, fos / Q000187:drug effects*; D006801:Humans; D007700:Kinetics; D011493:Protein Kinase C / Q000378:metabolism; D000090063:Proto-Oncogene Mas; D016755:Proto-Oncogene Proteins c-jun / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D013601:T-Lymphocytes / Q000187:drug effects / Q000378:metabolism; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D008063:Thioctic Acid / Q000031:analogs & derivatives* / Q000494:pharmacology*
chemical_list: C000715470:MAS1 protein, human; D000090063:Proto-Oncogene Mas; D016755:Proto-Oncogene Proteins c-jun; D012333:RNA, Messenger; D017382:Reactive Oxygen Species; D008063:Thioctic Acid; C015144:dihydrolipoic acid; D004247:DNA; D011493:Protein Kinase C; D013755:Tetradecanoylphorbol Acetate