Objective： To investigate whether total triterpene acids （TTAs）, isolated from Comus Fructus, attenuates renal function by reducing oxidative stress and down-regulating the expression of transforming growth factor ...Objective： To investigate whether total triterpene acids （TTAs）, isolated from Comus Fructus, attenuates renal function by reducing oxidative stress and down-regulating the expression of transforming growth factor β1 （TGF- β1）. Methods： Diabetes was induced by an injection of streptozotocin （40 mg/kg intravenously）. Thirty rats were randomly divided into three groups： control group, diabetic model group and l-rAs treatment group （50 mg/kg, intragastrically） administrated for 8 weeks from 5th to 12th week. All rats were anaesthetized and then were killed to remove kidneys. The renal function and redox enzyme system parameters were tested. Glomerular morphology was observed by a light microscopy. Immunohistochemistry and Western blot assays were employed to determine the protein levels of TGF- β1. Results： TTAs attenuated the levels of urinary protein, serum creatinine and blood urea nitrogen, although it did not significantly reduce the level of glucose. In addition, TTAs decreased the malondialdehyde while increased superoxide dismutase, catalase and glutathione peroxide activities in diabetic rats. The renal pathological changes in TTAs treatment group were ameliorated. Furthermore, TTAs also ameliorated the expression of TGF- β1. Conclusion： TTAs improved renal function via reducing oxidative stress and down-regulation the expression of TGF- β1 in diabetic rats.展开更多
基金Supported by a Project Supported by Scientific Research Fund of Zhejiang Provincial Education Department(No.Z201121669)a Project of Chinese Medica Science Foundation of Zhejiang Province(No.2009CA080)
文摘Objective： To investigate whether total triterpene acids （TTAs）, isolated from Comus Fructus, attenuates renal function by reducing oxidative stress and down-regulating the expression of transforming growth factor β1 （TGF- β1）. Methods： Diabetes was induced by an injection of streptozotocin （40 mg/kg intravenously）. Thirty rats were randomly divided into three groups： control group, diabetic model group and l-rAs treatment group （50 mg/kg, intragastrically） administrated for 8 weeks from 5th to 12th week. All rats were anaesthetized and then were killed to remove kidneys. The renal function and redox enzyme system parameters were tested. Glomerular morphology was observed by a light microscopy. Immunohistochemistry and Western blot assays were employed to determine the protein levels of TGF- β1. Results： TTAs attenuated the levels of urinary protein, serum creatinine and blood urea nitrogen, although it did not significantly reduce the level of glucose. In addition, TTAs decreased the malondialdehyde while increased superoxide dismutase, catalase and glutathione peroxide activities in diabetic rats. The renal pathological changes in TTAs treatment group were ameliorated. Furthermore, TTAs also ameliorated the expression of TGF- β1. Conclusion： TTAs improved renal function via reducing oxidative stress and down-regulation the expression of TGF- β1 in diabetic rats.
