Alterações histopatológicas e estresse oxidativo hepático em ratos diabéticos induzidos por estreptozotocina tratados com extrato aquoso de Vochysia rufa

Abstract

Diabetes mellitus (DM) consists of a group of syndromes characterized by hyperglycemia, altered lipid metabolism, carbohydrates, proteins, and an increased risk of complications. The aqueous extract of Vochysia rufa (AEVR), has been used to treat DM due to its hypoglycemic effect. Despite the popular use, there is a lack of information regarding the effect of AEVR in liver. The aim of this study was evaluate the effects of AEVR in oxidative stress, apoptosis index and morphological alterations in liver of rats. The animals were divided in six groups: non- (ND) and diabetic (DB) treated with AEVR (500mg/kg), glibenclamide (6mg/kg) and water. The rats were treated during 43 days. Liver was removed and stored at -80ºC to oxidative stress analysis. And fixed in 10% phosphate-buffered formalin, than were processed, embedded in paraffin, sectioned at 4μm and stained with hematoxylin and eosin for histological examination under a light microscope. Nuclei of hepatic cells were isolated and analyzed by flow cytometry to determine the apoptotic index. The DB group shows an increase in activity of antioxidant enzymes GPx, SOD and lipid peroxidation (TBARS), and decrease in GHS, GST, CAT rates. On the other hand, the DB-AEVR group got this oxidative parameters restored to normal levels. Although, a decreased apoptotic index was observed in DB group, and an increased in ND-GB group. And was observed a reduction of apoptosis in this groups: ND-AEVR, DB-AEVR and DB-GB. Histological analysis demonstrated there wasn't difference in groups. According to experimental conditions, the AEVR was efficient to reduce oxidative stress induced by STZ, apparently has an anti-apoptotic effect, and weren't observed pathologic changes in hepatic tissue.