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Journal Article
Review
Microvascular basement membranes in diabetes mellitus.
Journal of Pathology 2003 July
The alterations in the microvascular system of diabetes mellitus patients are responsible for the most devastating complications of this widespread disease. In the kidney, the microangiopathy leads to thickening of the glomerular capillary basement membrane but also to the expansion of the mesangial matrix and thickening of the tubular basement membrane. Several mechanisms are implicated in the pathogenesis of diabetic renal microangiopathy. These include increased synthesis of type IV collagen following hyperglycaemia-induced alteration of the pattern of podocyte-integrin expression, decreased expression of matrix metalloproteinases (MMP-2 and 3), and increased expression of tissue inhibitor of metalloproteinase (TIMP). An altered morphology of podocytes accompanies these basement membrane alterations. Other factors which may contribute to renal matrix accumulation include vascular endothelial growth factor (VEGF), since treatment with anti-VEGF antibodies attenuates glomerular basement membrane thickening, platelet-derived growth factor (PDGF) (B chain) and its receptor, which appear to be highly expressed in mesangial and visceral epithelial cells and might play a role in the development of diabetic nephropathy. Also oxygen radicals/oxidative stress may play a role in matrix accumulation in diabetic nephropathy as aminoguanidine, an inhibitor of the formation of advanced glycation end-products but with antioxidant properties, attenuates diabetic nephropathy. Retinal diabetic microangiopathy follows much the same principles, be it that microvascular proliferation is a distinctive element in the retina. Nephropathy and retinopathy occur frequently but not always together, indicating that in their multifactorial pathogenesis much remains to be clarified.
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