Sulforaphane attenuation of experimental diabetic nephropathy involves GSK-3 beta/Fyn/Nrf2 signaling pathway.

The Journal of Nutritional Biochemistry
Guoguo ShangHui Li

Abstract

Sulforaphane (SFN), the bioactive component of cruciferous vegetables, is a potent indirect antioxidant. Oxidative stress and activation of glycogen synthase kinase 3beta (GSK3β) are two major contributors to the pathogenesis of diabetic nephropathy (DN). Here, we investigated whether and how SFN affected GSK3β in experimental models of DN in vivo and in vitro. SFN treatment obviously prevented the increase in urine albumin excretion, matrix expansion, transforming growth factor-β1 expression, fibronectin and type IV collagen deposition in the diabetic kidney. Simultaneously, the level of 8-oxo-deoxyguanosine, an indicator of oxidative damage, was markedly lowered in SFN-treated diabetic rats, together with a significant reduction in activity of the GSK-3β/Fyn axis and an evident activation of Nrf2 signaling. Similarly, antifibrotic effects of SFN, parallel to enhanced inhibitory Ser9-phosphorylation of GSK3β and Fyn/Nrf2 nuclear export/import, were observed in the cultured rat mesangial cells (RMC) exposed to high glucose. The salutary effects of SFN on high-glucose-stimulated RMC were abolished by overexpression of GSK3β while being rescued by lithium chloride, a well-known GSK3β inhibitor. Taken together, our findings sugges...Continue Reading

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