RESUMO
BACKGROUND & PURPOSE: Exposure to organophosphorus during different phases of pregnancy induces many adverse impacts on the developing foetuses due to their immature detoxification system. We have estimated the potential amelioration role of quercetin against hepatic injury-induced apoptosis in rat foetuses following gestational exposure to fenitrothion and probable involvement of paraoxonase-1. METHODS: Forty pregnant rats were allocated into four groups; the first one kept as control, the second intubated with quercetin (100 mg/kg), the third orally administrated fenitrothion (4.62 mg/kg) and the last group received quercetin two hours before fenitrothion intoxication. RESULTS: Fenitrothion significantly elevated the foetal hepatic levels of thiobarbituric acid reactive substances, protein carbonyl, and nitric oxide, but it reduced the enzymatic activities of glutathione-S-transferase, superoxide dismutase, catalase, and acetylcholinesterase. Furthermore, fenitrothion provoked many histopathological changes in the foetal liver and markedly up-regulated the mRNA gene expression of p53, caspase-9 along with elevation in the immunoreactivity of Bax and caspase-3, but it down-regulated the expression level of paraoxonase-1. Remarkably, quercetin co-treatment successfully ameliorated the hepatic oxidative injury and apoptosis prompted by fenitrothion. CONCLUSIONS: Dietary supplements with quercetin can be used to reduce the risk from organophosphorus exposure probably through paraoxonase-1 up-regulation and enhancement of the cellular antioxidant system.