Papel potencial do ácido rosmarínico sobre biomarcadores de estresse oxidativo e acetilcolinesterase de ratos diabéticos induzidos por estreptozotocina

Abstract

Oxidative stress plays an important role in diabetic pathogenesis. Rosmarinic acid (RA) was used for the first time as an antioxidant agent for inhibition of diabetic nephropathy. Oxidative stress induced by Streptozotocin (STZ) has been shown to damage pancreatic beta cell and produce hyperglycemia in rats, inducing diabetes. In the present study, an attempt was made in investigation, the efficiency of rosmarinic acid in preventing alteration of oxidative parameters in liver, kidney and acetylcholinesterase (AChE) in brain of diabetic rat induced by STZ. The animals were divided into six groups (n=8): control; ethanol; RA 10 mg/kg; diabetic; diabetic/ethanol; diabetic/RA 10 mg/kg.In diabetes, the brain region become affected and showed increased level of lipid peroxidation in hippocampus, cortex and striatum, compared with control. The increased in lipid peroxidation was decreased or maintained to the level of control by RA in hippocampus (28%), cortex (38%) and striatum (47%) of diabetic rats after 21 days treatment at the dose of 10 mg/kg body weight. Furthermore, we found that diabetes caused significant decreased in the activity of antioxidant enzymes i.e. superoxide dismutase (SOD), catalase (CAT), Delta-aminolevulinic acid dehydratase (ALA-D) and non- enzymatic parameter like ascorbic acid, non proteinthiol (NPSH) in liver and kidney. The diabetic group treated with RA (10 mg/kg body weight for 21 days) significantly increased the activity of enzymes SOD, CAT, ALA-D and nonenzymatic ascorbic acid, NPSH in liver and kidney. Furthermore, these results indicate that rosmarinic acid sigificantly mimic the oxidative stress produced during hyperglycemia in STZ-induced diabetic rats. In addition, rosmarinic acid is potential candidate in the prevention of any alteration of pathological condition in diabetes. We suggest that rosmarinic acid could be a suitable candidate for the treatment of diabetes.