Nephrology Dialysis Transplantation, Vol 14, Issue 5 1078-1081, Copyright © 1999 by Oxford University Press
A Mogyorosi and F Ziyadeh
The small proteoglycan decorin may intercept the activity of the
TGF-{beta} system. Decorin administration has been advocated as
potential therapy in renal fibrotic diseases, because of the findings of a
relative deficiency of decorin and a relative excess of TGF-{beta} in
acute glomerulonephritis. Does a similar situation pertain in diabetic
kidney disease? Activation of TGF-{beta} seems to be crucial to tissue
injury in diabetic nephropathy, but until recently it has not been
established whether decorin plays any role in the manifestations of this
disease. We review evidence that a surfeit rather than a deficit in decorin
expression exists in diabetic renal disease, and that there exists a
negative feed-back loop whereby TGF-{beta}1 induces down-regulation of
decorin expression. Rat and mouse mesangial cells as well as mouse proximal
tubular cells in culture exhibit increased decorin mRNA levels in high
ambient glucose. Decorin mRNA level in the kidney of streptozotocin-induced
diabetes in mice is rapidly and significantly increased following the
induction of diabetes. Thus, the available evidence suggests that renal
decorin is not deficient in this disorder and hence decorin supplementation
does not seem to be warranted. Rather, interception of the effects of
TGF-{beta} seems to be an approach most likely to yield beneficial
results in diabetic nephropathy. Keywords: diabetic
nephropathy; extracellular matrix; fibrosis; glomerulopathy; proteoglycan;
transforming growth factor-{beta}
INVITED COMMENTS
What is the role of decorin in diabetic kidney disease?
Division of Nephrology, Department of Medicine, Virginia Commonwealth University/Medical College of Virginia and McGuire VAMC, Richmond, Virginia, USA; Renal-Electrolyte and Hypertension Division, Department of Medicine, and the Penn Center for the Molecular Studies of Kidney Diseases, University of Pennsylvania, 415 Curie Boulevard, 700 Clinical Research Building, Philadelphia, PA 19104-6144, USA; Corresponding author
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