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Effects of a selective Rho‐kinase inhibitor Y‐27632 on oxidative stress parameters in acute dichlorvos poisoning in rats
Author(s) -
Gunay N.,
Kose B.,
Demiryurek S.,
Ocak A. R.,
Erel O.,
Demiryurek A. T.
Publication year - 2008
Publication title -
cell biochemistry and function
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.933
H-Index - 61
eISSN - 1099-0844
pISSN - 0263-6484
DOI - 10.1002/cbf.1500
Subject(s) - dichlorvos , organophosphate , malondialdehyde , oxidative stress , chemistry , arylesterase , cholinesterase , organophosphate poisoning , medicine , pharmacology , endocrinology , biochemistry , biology , pesticide , pon1 , gene , genotype , agronomy
This study examined the effects of Y‐27632, a selective Rho‐kinase inhibitor, on organophosphate‐induced acute toxicity in rats. Rats were randomly divided into four groups as control (corn oil), dichlorvos (30 mg kg −1 i.p.), 1 and 10 mg kg −1 Y‐27632 + dichlorvos groups. Cholinergic signs (fatigue, tremor, cyanosis, hyper‐secretion, fasciculations) were observed in all the rats in the dichlorvos group and the mortality rate was 50%. No cholinergic findings and deaths were observed in the control and Y‐27632 groups. Plasma cholinesterase activities were suppressed with dichlorvos and these reductions were attenuated with Y‐27632 pretreatment. There was a marked increase in plasma malondialdehyde level in the dichlorvos group, but Y‐27632 pretreatment abolished this elevation. Dichlorvos markedly depressed cardiac paraoxonase activity, but these changes were not markedly modified with Y‐27632. Total antioxidant capacities, total oxidant status, oxidative stress index, total free sulfhydryl groups and catalase activities in plasma and cardiac tissues were not markedly different between the groups. No significant changes were observed with cardiac myeloperoxidase activities or plasma arylesterase and ceruloplasmin activities. In conclusion, our results suggest that Rho‐kinase pathway is involved in organophosphate intoxication, and a decrease in cardiac paraoxonase activities may play a role in the pathogenesis of acute organophosphate poisoning in rats. Copyright © 2008 John Wiley & Sons, Ltd.