Kidney androgen-regulated protein interacts with cyclophilin B and reduces cyclosporine A-mediated toxicity in proximal tubule cells

The Journal of Biological Chemistry
C CebriánA Meseguer

Abstract

The gene for kidney androgen-regulated protein (KAP) is the most abundant and specific gene expressed in mouse kidney proximal tubule cells, where it is tightly regulated by steroid and thyroid hormones in different tubule segments. Despite the cell-specific expression, strict regulatory mechanisms, and relative abundance, nothing is known of the function of its encoded protein, which does not exhibit known structural or functional domains, or homologies with other sequences in the data bases. We raised monoclonal antibodies against KAP, which specifically recognize a protein with an apparent molecular mass of 20 kDa in crude kidney homogenates, the distribution and regulation of which parallel that of its mRNA. To gain insight into its function, we performed a yeast two hybrid screen and determined that KAP specifically interacts with cyclophilin B. Furthermore, cyclosporine A (CsA)-treated mice exhibited a significant decrease in KAP levels, and tetracycline-controlled overexpression of KAP in stably transfected proximal tubule cells significantly decreased the toxic effects of CsA. Taken together, these results indicate a functional relationship among KAP-, cyclophilin B-, and CsA-mediated nephrotoxicity and suggest an impor...Continue Reading

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Citations

Sep 6, 2005·Pflügers Archiv : European journal of physiology·Sheerazed BoulkrounNathalie Courtois-Coutry
Jun 6, 2003·Kidney International·Douglas M SilversteinRobert L Chevalier
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