The present study was undertaken; to evaluate the protective effect of argan oil against mercuric chloride induced oxidative stress in experimental rats. Adult male albinos wistar rats randomly divided into four groups, were the first was served as a control, whereas the remaining groups respectively treated with: argan oil (5ml/ kg b.w; by gavage), mercuric chloride (0.25 mg/kg body weight i.p) and combination of argan oil and HgCl 2 . Change in liver enzyme activities, thiobarbituric acid reactive substances (TBARS) level, antioxidants and reduced glutathione (GSH) contents were determined after 3weeks experimental period. Exposure of rats to mercuric chloride caused a significant increase the lipid peroxidation level along with corresponding decrease in the reduced glutathione and various antioxidant enzymes in liver. And increase in serum: total billirubin, direct billirubin levels, APL, LDH and transaminases activities. Supplementation of argan oil resulted in decreased of lipid peroxidation level and in the serum: AST, ALT, APL and LDH activities were decreased along with increase in liver GSH level. The activities of antioxidants enzymes: glutathione peroxidase (GSH-Px) and glutathione -S-transferase (GST) were also concomitantly restored to near normal level by argan oil supplementation to mercuric chloride intoxicated rats. Liver histological studies have confirmed the changes observed in biochemical parameters and proved the beneficial role of argan oil. The results clearly demonstrate that argan oil treatment augments the antioxidants defense mechanism in mercuric chloride induced toxicity and provides evidence that it may have a therapeutic role in free radical mediated diseases.
Résumé -Objectif : Ce travail porte sur l'étude de l'effet toxique de l'acétate de plomb sur l'activité du système de défense de glutathion chez les rats. Méthodes : Cette étude a été réalisée sur 40 rats mâles (Albinos wistar) qui ont été répartis en quatre groupes. Pendant une semaine, trois lots de rats ont été traités par une injection intrapéritonéale (ip) par trois doses différentes d'acétate de plomb (25, 50, 100 mg/kg) de poids corporel; un lot témoin a été traité (ip) uniquement par un soluté isotonique de chlorure de sodium. Résultats : L'injection des rats par l'acétate de plomb a provoqué une variation des paramètres biochimiques et biologiques exprimée notamment par une augmentation du rapport hépato-corporel, surtout chez les rats recevant des doses importantes. Les concentrations sériques en glucose, urée, créatinine, acide urique, phosphatases alcalines et amino transferases (ASAT et ALAT) ont augmenté significativement. La concentration des protéines sériques a diminué chez les rats traités par les doses élevées par rapport aux témoins. L'auto-oxydation lipidique exprimée par la concentration de malondialdéhyde (MDA) a également augmenté chez les rats traités. Enfin, les résultats obtenus mettent en évidence le potentiel détoxifiant du système enzymatique de glutathion exprimé par la diminution de la concentration de glutathion tissulaire (GSH) et l'augmentation des activités des enzymes liées au glutathion (glutathion S-transférase, glutathion peroxydase et glutathion réductase) chez tous les lots traités. Conclusion : Au regard des ces résultats, une relation étroite a été signalée entre la diminution de la concentration de GSH tissulaire et l'augmentation des activités de la GST, GPx et GR chez les rats traités par l'acétate de plomb. Ceci explique probablement le rôle du système de glutathion dans la détoxication des métabolites toxiques des polluants et donc la protection de la cellule vivante. Mots clés :Stress oxydant, glutathion, glutathion peroxydase, glutathion réductase, glutathion S-transférase, acétate de plomb Abstract -Objective : This work is mainly devoted to the study of the toxic effect of lead acetate on the activity of the glutathione defense system in rats. Methods: This study was carried out on 40 male rats (Wistar Albino) divided into four groups, three of which were treated with intraperitoneal injection (ip) of three different doses of lead acetate: (25, 50 and 100 mg/kg) of body weight; the control group was treated (ip) with physiological water only, for one week. Results: The injection of rats with lead acetate caused a change in the biochemical and biological parameters, indicated particularly by an increase in the hepatosomatic index, especially in rats treated with large doses. Moreover, the serum concentration of glucose, urea, creatinine, uric acid, alkaline phosphatases and aminotransferases (ASAT and ALAT) increased significantly compared with the control group, whereas the serum protein content decreased significantly in treated rats with high doses compared ...
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