Elevated glucose induction of thrombospondin-1 up-regulates fibronectin synthesis in proximal renal tubular epithelial cells through TGF-β1 dependent and TGF-β1 independent pathways

摘要

Background. TGF-β1 bioactivation, consequent to the interaction of latent TGF-β1 with thrombospondin-1 (TSP-1), correlates with matrix accumulation in mesangial cells. Tubulointerstitial damage predicts poor renal survival. There is little data on TGF-β1 bioactivation and matrix synthesis in human proximal renal tubular epithelial cells under the influence of high glucose concentrations. This study thus investigates the role of TSP-1 in mediating elevated glucose-induction of TGF-β1 bioactivation and fibronectin (FN) synthesis in human proximal tubular epithelial cells.