title: Induced expression of early response genes/oxidative injury in rat pheochromocytoma (PC12) cell line by 6-hydroxydopamine: implication for Parkinson's disease.
abstract: The expression of early response gene proteins c-Fos, c-Jun, and GAP-43 and their association with 6-hydroxydopamine (6-OHDA)-mediated oxidative injury were investigated using catecholaminergic PC12 cell line. Significant induction in the expression of c-Fos (P < 0.01), c-Jun (P < 0.001) and GAP-43 (P < 0.05) was observed following 2 h exposure to 6-OHDA (10(-6) M), which persisted during 24 h of observation. The exposed cells exhibited an increase in lipid peroxidation (48, 59 and 33%) along with decreased catalase activity (49, 30 and 13%) and glutathione levels (39, 28 and 16%) following 24, 48 and 72 h exposure, respectively. A concentration-dependent functional impairment of mitochondria as studied by 3-(4,5-dimethyl thiazol-2-yl)-2,5-diphenyl tetrazolium bromide assay and decreased cell survival were also observed following 6-OHDA (10(-4), 10(-5) M) exposure for 24, 48 and 72 h. The results indicate a role of the early response gene in oxidative stress-mediated dopaminergic cell death by 6-OHDA. Similar mechanisms may also be operative in the development of Parkinson's disease, as an increased presence/formation of endogenous 6-OHDA has been reported in Parkinson's patients.
authors.affiliation: Industrial Toxicology Research Centre, Mahatma Gandhi Marg, Post Box 80, Lucknow 226 001, India. sethkavita@rediffmail.com
authors.forename: K
authors.initials: K
authors.lastname: Seth
authors.forename: A K
authors.initials: AK
authors.lastname: Agrawal
authors.forename: M H
authors.initials: MH
authors.lastname: Aziz
authors.forename: A
authors.initials: A
authors.lastname: Ahmad
authors.forename: Y
authors.initials: Y
authors.lastname: Shukla
authors.forename: N
authors.initials: N
authors.lastname: Mathur
authors.forename: P K
authors.initials: PK
authors.lastname: Seth
mesh_terms: D000818:Animals; D019922:GAP-43 Protein / Q000096:biosynthesis / Q000235:genetics*; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects*; D016762:Genes, fos / Q000187:drug effects*; D016758:Genes, jun / Q000187:drug effects*; D018384:Oxidative Stress / Q000187:drug effects / Q000235:genetics*; D016627:Oxidopamine / Q000378:metabolism / Q000633:toxicity*; D016716:PC12 Cells; D010300:Parkinson Disease / Q000235:genetics* / Q000378:metabolism*; D051381:Rats
chemical_list: D019922:GAP-43 Protein; D016627:Oxidopamine