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E-mail contact: mariafelice.brizzi{at}unito.it
The molecular events associated with acute and chronic exposure of mesangial cells (MC) to hyperglycemia were evaluated. We found that, unlike high glucose (HG) and Amadori adducts, advanced glycation end products (AGE) and transforming growth factor-β (TGF-β) induced p21waf expression and accumulation of MC in G0/G1. TGF-β1 blockade inhibited AGE-mediated collagen production but only partially affected AGE-induced p21waf expression and cell-cycle events, indicating that AGE by binding to AGE receptor (RAGE) per se could control MC growth. Moreover, AGE and TGF-β treatment led to the activation of the signal transduction and activators of transcription (STAT)5 and the formation of a STAT5/p21SIE2 complex. The role of STAT5 in AGE- and TGF-β-mediated p21waf expression and growth arrest, but not collagen production, was confirmed by the expression of the dominant negative STAT5 (ΔSTAT5) or the constitutively activated STAT5 (1*6-STAT5) constructs. Finally, in p21waf−/− fibroblasts both AGE and TGF-β failed to inhibit cell-cycle progression. A potential in vivo role of these mechanisms was sustained by the increasing immunoreactivity for the activated STAT5 and p21waf in kidney biopsies from early to advanced stage of diabetic nephropathy. Our data indicate that AGE- and TGF-β-mediated signals, by converging on STAT5 activation and p21waf expression, may regulate MC growth.
Key words: MC • signal transduction and activators of transcription • AGE
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