Reversibility of renal injury with cholesterol lowering in hyperlipidemic diabetic mice1

• Main Authors: Deepa Taneja, Joel Thompson, Patricia Wilson, Katie Brandewie, Liliana Schaefer, Bonnie Mitchell, Lisa R. Tannock
• Format: Article
• Language: English
• Published: Elsevier 2010-06-01
• Series: Journal of Lipid Research
• Subjects: diabetes; mesangial matrix; apolipoprotein B
• Online Access: http://www.sciencedirect.com/science/article/pii/S002222752041020X

Hyperlipidemia is a risk factor for development and progression of diabetic nephropathy. However, it is not known if reduction of hyperlipidemia is protective against progression of disease. The goal of this study was to determine if reduction of hypercholesterolemia could limit progression of diabetic nephropathy. Diabetic and nondiabetic LDL receptor deficient (LDLR−/−) mice were fed diets containing either no cholesterol (0%) or high cholesterol (0.12%) for 36 weeks. One group each of diabetic and nondiabetic mice were fed the high-cholesterol diet for 26 weeks then changed to the 0% cholesterol diet for the last 10 weeks. Consumption of the high-cholesterol diet exacerbated the development of diabetic nephropathy with elevations in urine albumin excretion, glomerular and renal hypertrophy, and mesangial matrix expansion. Increased glomerular lipid and apolipoprotein B accumulation was found in diabetic mice that consumed the 0.12% cholesterol diet compared with other groups. However, diabetic mice that changed from the high-cholesterol diet to the 0% cholesterol diet for the last 10 weeks had lower urine albumin excretion and mesangial matrix expansion compared with mice that consumed the 0.12% cholesterol diet throughout. This suggests that hyperlipidemia causes continuous renal injury, and that lowering cholesterol levels by dietary means can improve renal function in diabetic LDLR−/− mice.