ABSTRACT
Antitubercular drug induced hepatotoxicity is a major hurdle for an effective treatment of tuberculosis. The present study was undertaken to assess the hepatoprotective potential of tocopherol (50 mg/kg and 100 mg/kg, ip) and to compare it with cimetidine (120 mg/kg, ip). Hepatotoxicity was produced by giving isoniazid (INH, 50 mg/kg, po) and rifampicin (RMP, 100 mg/kg, po) combination to albino rabbits for 7 days. Assessment of liver injury was done by estimating levels of alanine transaminase (ALT) and argininosuccinic acid lyase (ASAL) in serum and by histopathological examination of liver. Results revealed that pretreatment with high dose of tocopherol (100 mg/kg) prevented both biochemical as well as histopathological evidence of hepatic damage induced by INH and RMP combination. Moreover, tocopherol (100 mg/kg) was found to be a more effective hepatoprotective agent as compared to cimetidine.
Subject(s)
Animals , Antioxidants/administration & dosage , Antitubercular Agents/toxicity , Cimetidine/pharmacology , Dose-Response Relationship, Drug , Drug-Related Side Effects and Adverse Reactions/prevention & control , Enzyme Inhibitors/pharmacology , Isoniazid/toxicity , Liver Diseases/chemically induced , Rabbits , Rifampin/toxicity , Tocopherols/administration & dosageABSTRACT
There are a few clinical trials on human that show the effect of topical vitamin E on keloid and hypertrophic scars. In this investigation we try to study this effect and also show the effect of the concentrations which have not been considered yet in improving hypertrophic scar and keloid healing. In a double-blind randomized clinical trial, 32 patients who had hypertrophic scar from 12 weeks ago were given three ointments including placebo and ointments contaning injectional vitamin E [d-a tocopheryl] with different concentrations [300Iu/mg and 600Iu/mg]. The scars size, erythema and hardness were evaluated by patients and physicians after 1, 4 and 12 weeks. Data was analyzed using ANOVA and Kruskal Walis tests. After 12 weeks there were no signs or symptoms of dermatitis and rash. Comparison of the scar size after 1 week showed difference between the high concentrated ointment with the others and in the 12[th] week all of the ointments were different [p<0.001]. Evaluation of the scar erythema, in the 1[th], 4[th] and 12[th] week showed significant difference between vitamin ointments and placebo [p<0.001], also scar hardness in the 12[th] week was significantly different between groups [p<0.001], but in the first and 4[th] week no difference was detected in hardness. This study shows that topical vitamin E has good effects on keloid and hypertropic scars. Their effect in decreasing size and erythema is more considerable than scar hardness