An extract of Pueraria tuberosa tubers attenuates diabetic nephropathy by upregulating matrix metalloproteinase-9 expression in the kidney of diabetic rats

Published on Feb 1, 2017in Journal of Diabetes3.28
· DOI :10.1111/1753-0407.12393
Yamini B. Tripathi26
Estimated H-index: 26
Rashmi Shukla8
Estimated H-index: 8
+ 2 AuthorsMohan Kumar4
Estimated H-index: 4
(IMS-BHU: Institute of Medical Sciences, Banaras Hindu University)
Background Currently, no drug is available to directly target the signaling molecules involved in the pathogenesis of diabetic nephropathy (DN); only antihypertensive and antidiabetic drugs are in clinical use. In the present study, the therapeutic effects of a active fraction of tubers from Pueraria tuberosa (hereafter referred to as PTY-2) were investigated in streptozotocin (STZ)-diabetic rats with DN, with particular emphasis on its effects on extracellular matrix (ECM) accumulation and matrix metalloproteinase (Mmp)-9 expression in kidney tissue. Methods Rats were injected with 55 mg/kg, i.p., STZ. After 40 days, rats were divided into groups as follows (n = 6 per group): Group 1, age-matched rats not injected with STZ (non-diabetic control); Group 2, STZ-diabetic DN rats; and Group 3, PTY-2 (30 mg/100 g, p.o.)-treated DN rats. After 20 days treatment, the effects of PTY-2 on serum urea and creatinine concentrations, urinary levels of glucose, creatinine, protein, and ketone bodies, and urine pH were determined. Kidney tissue was evaluated for Mmp-9 expression and histological changes. Results Blood glucose, serum urea, creatinine, and urine protein levels were significantly higher, and creatinine clearance was significantly lower, in Group 2 versus Group 1 rats. There was a higher degree of glomerulosclerosis, expansion of the mesangial matrix, and excess ECM deposition and eosinophilic casts in kidneys from Group 2 versus Group 1 rats. Furthermore, Mmp-9 activity and expression were significantly reduced in kidney homogenate of Group 2 versus Group 1 rats. Interestingly, PTY-2 treatment significantly reversed all these changes in DN rats. Conclusion Treatment of DN rats with PTY-2 significantly attenuated the severity of DN by increasing the expression and activity of Mmp-9, consequently degrading the ECM accumulated in kidney tissue.
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