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Research

ADAM10 is expressed in human podocytes and found in urinary vesicles of patients with glomerular kidney diseases

Paul Gutwein , Anja Schramme , Mohamed SADEK Abdel-Bakky , Kai Doberstein , Ingeborg A Hauser , Andreas Ludwig , Peter Altevogt , Stefan Gauer , Anja Hillmann , Thomas Weide , Chrsitine Jespersen , Wolfgang Eberhardt and Josef Pfeilschifter

Journal of Biomedical Science 2010, 17:3doi:10.1186/1423-0127-17-3

Published:	13 January 2010

Abstract (provisional)

Background

The importance of the Notch signaling in the development of glomerular diseases has been recently described. Therefore we analyzed in podocytes the expression and activity of ADAM10, one important component of the Notch signaling complex.

Methods

By Western blot, immunofluorescence and immunohistochemistry analysis we characterized the expression of ADAM10 in human podocytes, human urine and human renal tissue.

Results

We present evidence, that differentiated human podocytes possessed increased amounts of mature ADAM10 and released elevated levels of L1 adhesion molecule, one well known substrate of ADAM10. By using specific siRNA and metalloproteinase inhibitors we demonstrate that ADAM10 is involved in the cleavage of L1 in human podocytes. Injury of podocytes enhanced the ADAM10 mediated cleavage of L1. In addition, we detected ADAM10 in urinary podocytes from patients with kidney diseases and in tissue sections of normal human kidney. Finally, we found elevated levels of ADAM10 in urinary vesicles of patients with glomerular kidney diseases.

Conclusions

The activity of ADAM10 in human podocytes may play an important role in the development of glomerular kidney diseases.