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Gallic acid attenuates type I diabetic nephropathy in rats.
Chemico-biological Interactions 2018 Februrary 26
Literature suggests that TGF-β1 has a central role in the progression of diabetic nephropathy and its down regulation can improve the disease condition. Oxidative stress, generation of advanced glycation end products and activation of renin angiotensin system are the connecting links between hyperglycemia and TGF-β1 over expression. Gallic acid is a phytochemical having wide range of biological activities. Gallic acid is reported to have antioxidant and advanced glycation inhibitory activity. It has also shown inhibitory effects on angiotensin converting enzyme. Gallic acid qualifies as a drug candidate to be tested in the diabetic nephropathy, one of the important complication of diabetes. Streptozotocin (55 mg/kg body weight, i.p.) induced diabetic nephropathy was used as an experimental model. Gallic acid was evaluated for its possible effect at the dose of 20 and 40 mg/kg body weight. Gallic acid treatment significantly lowered plasma levels of the creatinine and blood urea nitrogen and elevated the levels of the protein and albumin. Gallic acid also improved creatinine clearance. Determination of oxidative stress parameters showed that the oxidative stress in kidney tissues was reduced significantly in gallic acid treated animals. Results of the plasma, urine and oxidative stress parameters were also reflected in the histopathological evaluation showing improvement in kidney pathophysiology. ELISA assay for circulating TGF-β1 evaluation and immunohistochemical study for determination of kidney expression of TGF-β1 revealed that gallic acid significantly lowered both the circulating and tissue levels of TGF-β1. Results support the hypothesis that gallic acid can be effectively used in the treatment of diabetic nephropathy.
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