KIBRA modulates directional migration of podocytes

K Duning, EM Schurek, M Schluter, M Bayer, HC Reinhardt, A Schwab, L Schaefer, T Benzing, B Schermer, MA Saleem, TB Huber, S Bachmann, J Kremerskothen, T Weide, H Pavenstadt

Research output: Contribution to journalArticle (Academic Journal)peer-review

85 Citations (Scopus)

Abstract

Asymmetric delivery and distribution of macromolecules are essential for cell polarity and for cellular functions such as differentiation, division, and signaling. Injury of podocytes, which are polarized epithelial cells, changes the dynamics of the actin meshwork, resulting in foot process retraction and proteinuria. Although the spatiotemporal control of specific protein-protein interactions is crucial for the establishment of cell polarity, the mechanisms controlling polarity-dependent differentiation and division are incompletely understood. In this study, yeast two-hybrid screens were performed using a podocyte cDNA library and the polarity protein PATJ as bait. The protein KIBRA was identified as an interaction partner of PATJ and was localized to podocytes, tubular structures, and collecting ducts. The last four amino acids of KIBRA mediated binding to the eighth PDZ domain of PATJ. In addition, KIBRA directly bound to synaptopodin, an essential organizer of the podocyte cytoskeleton. Stable knockdown of KIBRA in immortalized podocytes impaired directed cell migration, suggesting that KIBRA modulates the motility of podocytes by linking polarity proteins and cytoskeleton-associated protein complexes.
Translated title of the contributionKIBRA modulates directional migration of podocytes
Original languageEnglish
Pages (from-to)1891 - 1903
Number of pages13
JournalJournal of the American Society of Nephrology
Volume19(1)
DOIs
Publication statusPublished - Oct 2008

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