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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Physiol+Renal+Physiol
2010 ; 298
(6
): F1492-503
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CLIC5A, a component of the ezrin-podocalyxin complex in glomeruli, is a
determinant of podocyte integrity
#MMPMID20335315
Wegner B
; Al-Momany A
; Kulak SC
; Kozlowski K
; Obeidat M
; Jahroudi N
; Paes J
; Berryman M
; Ballermann BJ
Am J Physiol Renal Physiol
2010[Jun]; 298
(6
): F1492-503
PMID20335315
show ga
The chloride intracellular channel 5A (CLIC5A) protein, one of two isoforms
produced by the CLIC5 gene, was isolated originally as part of a cytoskeletal
protein complex containing ezrin from placental microvilli. Whether CLIC5A
functions as a bona fide ion channel is controversial. We reported previously
that a CLIC5 transcript is enriched approximately 800-fold in human renal
glomeruli relative to most other tissues. Therefore, this study sought to explore
CLIC5 expression and function in glomeruli. RT-PCR and Western blots show that
CLIC5A is the predominant CLIC5 isoform expressed in glomeruli. Confocal
immunofluorescence and immunogold electron microscopy reveal high levels of
CLIC5A protein in glomerular endothelial cells and podocytes. In podocytes,
CLIC5A localizes to the apical plasma membrane of foot processes, similar to the
known distribution of podocalyxin and ezrin. Ezrin and podocalyxin colocalize
with CLIC5A in glomeruli, and podocalyxin coimmunoprecipitates with CLIC5A from
glomerular lysates. In glomeruli of jitterbug (jbg/jbg) mice, which lack the
CLIC5A protein, ezrin and phospho-ERM levels in podocytes are markedly lower than
in wild-type mice. Transmission electron microscopy reveals patchy broadening and
effacement of podocyte foot processes as well as vacuolization of glomerular
endothelial cells. These ultrastructural changes are associated with
microalbuminuria at baseline and increased susceptibility to adriamycin-induced
glomerular injury compared with wild-type mice. Together, the data suggest that
CLIC5A is required for the development and/or maintenance of the proper
glomerular endothelial cell and podocyte architecture. We postulate that the
interaction between podocalyxin and subjacent filamentous actin, which requires
ezrin, is compromised in podocytes of CLIC5A-deficient mice, leading to
dysfunction under unfavorable genetic or environmental conditions.