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Background: Diabetes mellitus is a major endocrine disorder and growing health problem in most countries. Diabetes manifested by experimental animal models exhibits high oxidative stress due to persistent and chronic hyperglycemia which increases the generation of free radicals, streptozotocin (STZ) provides an animal model of type 1 diabetes. Thereby depleting the activities of antioxidative defense systems with alteration of antioxidant activities of enzymes such as green tea and curcumin .  Aim : Biochemical  histological and histochemical investigations were carried on to revel the effect of STZ on the liver and pancreas cells.  Natural antioxidants were used as a new way for ameliorating diabetic effect on the cells Material and methods: Diabetes was induced by a single intraperitoneal injection of freshly prepared STZ dissolved in 0.05M of sodium citrate buffer, pH = 4.6, (STZ; 45 mg/kg B.wt.).Three days after degeneration of beta cells, diabetes was induced in all animals. After induction of diabetes, diabetic and normal animals were kept in metabolic cages separately. Green tea (EGCG) and curcumin are used as natural antioxidants to improve the disorders and structural changes induced by STZ. Cellular and histochemical investigations were carried on the changes induced in the pancreatic and hepatic tissues.Body weight, level of serum glucose and insulin were calculated in the control and treated groups. For detecting the degeneration of both hepatocytes and pancreatic cells of diabetic rats, tissue samples from diabetic and treated rats were collected and pathologically examined. Results: The present investigations reveled that there was a detectable amelioration on the injures induced by STZ on both hepatocytes and pancreatic cells using green tea or curcumin with a detectable dose level. Also it can be observed that the ameliorated effect induced was a time dependant. Conformation of these results from histochemical detection of polysaccharides and DNA contents were detected by PAS and Feulgen reactions. Conclusion: Curcumin and green tea look to have a powerful effect against diabetic cell injury induced in both rat liver and pancreas. The ameliorating effect seem to be time dependant.

the egyptian journal of hospital medicine

Cytological And Histochemical Studies On Rat Liver And Pancreas During Progression Of Streptozotocin Induced Diabetes And Possible Protection Using Certain Natural Antioxidants