Central role of TGF-beta in the pathogenesis of diabetic nephropathy and macrovascular complications: a hypothesis

Diabetic Medicine : a Journal of the British Diabetic Association
H Yokoyama, T Deckert

Abstract

Patients with insulin-dependent diabetes mellitus (IDDM) and albuminuria are at high risk for severe micro- and macrovascular complications. Diabetic vascular complications are characterized by structural alterations of extracellular matrix (ECM) components in glomeruli and large vessel walls, namely, accumulation of collagen IV, collagen VI and fibronectin and relative decrease of heparan sulphate proteoglycan (HSPG). We hypothesize that the defect remodelling of ECM contributing to nephropathy and macrovascular disease is induced by overproduction of transforming growth factor-beta (TGF-beta). Recent reports indicate that hyperglycaemia, increased intraglomerular pressure, and glycated proteins potentially induce overproduction of TGF-beta in diabetes. TGF-beta stimulates production of ECM components such as collagen IV, fibronectin, proteoglycans (decorin and biglycan) without increasing HSPG. TGF-beta overproduction leads to glomerulosclerosis and TGF-beta is a causal factor in myointimal hyperplasia after balloon injury of carotid artery. It mediates angiotensin II modulator effect on smooth muscle cell growth. These findings may indicate TGF-beta overproduction to be a common pathogenetic step explaining the well-known as...Continue Reading

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