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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+Gastrointest+Liver+Physiol
2016 ; 310
(8
): G586-98
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Deletion of Na+/H+ exchanger regulatory factor 2 represses colon cancer progress
by suppression of Stat3 and CD24
#MMPMID26867566
Yoshida M
; Zhao L
; Grigoryan G
; Shim H
; He P
; Yun CC
Am J Physiol Gastrointest Liver Physiol
2016[Apr]; 310
(8
): G586-98
PMID26867566
show ga
The Na(+)/H(+) exchanger regulatory factor (NHERF) family of proteins is
scaffolds that orchestrate interaction of receptors and cellular proteins.
Previous studies have shown that NHERF1 functions as a tumor suppressor. The goal
of this study is to determine whether the loss of NHERF2 alters colorectal cancer
(CRC) progress. We found that NHERF2 expression is elevated in advanced-stage
CRC. Knockdown of NHERF2 decreased cancer cell proliferation in vitro and in a
mouse xenograft tumor model. In addition, deletion of NHERF2 in Apc(Min/+) mice
resulted in decreased tumor growth in Apc(Min/+) mice and increased lifespan.
Blocking NHERF2 interaction with a small peptide designed to bind the second PDZ
domain of NHERF2 attenuated cancer cell proliferation. Although NHERF2 is known
to facilitate the effects of lysophosphatidic acid receptor 2 (LPA2),
transcriptome analysis of xenograft tumors revealed that NHERF2-dependent genes
largely differ from LPA2-regulated genes. Activation of ?-catenin and ERK1/2 was
mitigated in Apc(Min/+);Nherf2(-/-) adenomas. Moreover, Stat3 phosphorylation and
CD24 expression levels were suppressed in Apc(Min/+);Nherf2(-/-) adenomas.
Consistently, NHERF2 knockdown attenuated Stat3 activation and CD24 expression in
colon cancer cells. Interestingly, CD24 was important in the maintenance of Stat3
phosphorylation, whereas NHERF2-dependent increase in CD24 expression was blocked
by inhibition of Stat3, suggesting that NHERF2 regulates Stat3 phosphorylation
through a positive feedback mechanism between Stat3 and CD24. In summary, this
study identifies NHERF2 as a novel oncogenic protein and a potential target for
cancer treatment. NHERF2 potentiates the oncogenic effects in part by regulation
of Stat3 and CD24.