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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 J+Exp+Clin+Cancer+Res
2017 ; 36
(1
): 130
Nephropedia Template TP
gab.com Text
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English Wikipedia
The acid-sensing ion channel, ASIC2, promotes invasion and metastasis of
colorectal cancer under acidosis by activating the calcineurin/NFAT1 axis
#MMPMID28927426
Zhou ZH
; Song JW
; Li W
; Liu X
; Cao L
; Wan LM
; Tan YX
; Ji SP
; Liang YM
; Gong F
J Exp Clin Cancer Res
2017[Sep]; 36
(1
): 130
PMID28927426
show ga
BACKGROUND: The tumor acidic microenvironment, a common biochemical event in
solid tumors, offers evolutional advantage for tumors cells and even enhances
their aggressive phenotype. However, little is known about the molecular
mechanism underlying the acidic microenvironment-induced invasion and metastasis.
METHODS: We examined the expression of the acid-sending ion channel (ASIC) family
members after acidic exposure using RT-PCR and immunofluoresence. Gene
manipulation was applied to reveal the potential of ASIC2 on invasion,
proliferation, colony formation of colorectal cancer (CRC). We assessed the in
vivo tumor growth by subcutaneous transplantation and metastasis by spleen
xenografts. Chromatin immunoprecipitation-sequencing was used to uncover the
binding sites of NFAT1. Finally, we examined the expression of ASIC2 in CRC
tissues using immunohistochemistry. RESULTS: Acidic exposure led to up-regulation
of the acid-sensing ion channel, ASIC2, in colorectal cancer (CRC) cells. ASIC2
overexpression in CRC cell lines, SW480 and HCT116, significantly enhanced cell
proliferation in vitro and in vivo, while ASIC2 knockdown had the reverse effect.
Importantly, ASIC2 promoted CRC cell invasion under acidosis in vitro and liver
metastasis in vivo. Mechanistically, ASIC2 activated the calcineurin/NFAT1
signaling pathway under acidosis. Inhibition of the calcineurin/NFAT pathway by
cyclosporine A (CsA) profoundly attenuated ASIC2-induced invasion under acidosis.
ChIP-seq assay revealed that the nuclear factor, NFAT1, binds to genes clustered
in pathways involved in Rho GTPase signaling and calcium signaling. Furthermore,
immunohistochemistry showed that ASIC2 expression is increased in CRC samples
compared to that in adjacent tissues, and ASIC2 expression correlates with
T-stage, distant metastasis, recurrence, and poor prognosis. CONCLUSION: ASIC2
promotes metastasis of CRC cells by activating the calcineurin/NFAT1 pathway
under acidosis and high expression of ASIC2 predicts poor outcomes of patients
with CRC.