Bestrophin 1 promotes epithelial-to-mesenchymal transition of renal collecting duct cells

Fadi Aldehni, Melanie Spitzner, Joana Raquel Martins, René Barro-Soria, Rainer Schreiber, Karl Kunzelmann

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Bestrophin 1 (Best1) controls intracellular Ca2+ concentration, induces Ca2+ -activated Cl- conductance, and increases proliferation of colon carcinoma cells. Here, we show that expression of Best1 in mouse renal collecting duct (CD) cells causes i) an increase in cell proliferation, ii) a loss of amiloride-sensitive Na+ absorption, iii) induction of Ca2+-dependent Cl- conductance (CaCC), and iv) epithelial-to-mesenchymal transition. During conditions of high proliferation or when we exposed CD cells to serum or TGF-β1, we observed upregulation of Best1, increased CaCC, redistribution of the epithelial-to-mesenchymal transition marker β-catenin, and upregulation of vimentin. In contrast, suppression of Best1 by RNAi inhibited proliferation, reduced CaCC, and downregulated markers of EMT. CaCC and expression of Best1 were independent of the cell cycle but clearly correlated to cell proliferation and cell density. During renal inflammation in LPS-treated mice or after unilateral ureteral obstruction, we observed transient upregulation of Best1. These data indicate that repression of cell proliferation, CaCC, and expression of Best1 occurs during mesenchymal-to-epithelial transition once CD cells polarize and terminally differentiate. These results may suggest a role for Best1 in renal fibrosis and tissue repair.

Original languageEnglish (US)
Pages (from-to)1556-1564
Number of pages9
JournalJournal of the American Society of Nephrology
Volume20
Issue number7
DOIs
StatePublished - Jul 2009
Externally publishedYes

ASJC Scopus subject areas

  • Nephrology

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