Abstract
Accumulation of plasma advanced oxidation protein products (AOPPs) promotes progression of proteinuria and glomerulosclerosis. To investigate the molecular basis of AOPPs-induced proteinuria, normal Sprague-Dawley rats were treated with AOPPs-modified rat serum albumin. The expression of glomerular podocyte slit diaphragm (PSD)-associated proteins, nephrin and podocin, was significantly decreased coincident with the onset of albuminuria in rats treated with AOPPs. Chronic inhibition of NADPH oxidase by apocynin prevented down-regulation of nephrin and podocin and decreased albuminuria in AOPPs-challenged rats. This suggested that accumulation of AOPPs promotes proteinuria, possibly via down-regulating the expression of PSD-associated proteins.
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