Na+/H+ exchanger 1, Na+/Ca2+ exchanger 1 and calmodulin complex regulates interleukin 6-mediated cellular behavior of human hepatocellular carcinoma.

Abstract:

:Interleukin 6 (IL6) is a key cytokine involved in the development and progression of inflammation-associated hepatocellular carcinoma (HCC). However, the mechanisms of IL6 action on HCC remain largely unknown. Proton and Ca(2+) are two intracellular messenger ions, which are believed to play a central role in tumorigenesis and tumor progression. In this study, we found that IL6 stimulation markedly increased intracellualr pH recovery rates of human HCC cells, Huh7 and HepG2, after NH4Cl acidification, and the NH4Cl acidification induced transient intracellular Ca(2+) increases in the HCC cells. The inhibition of Na(+)/H(+) exchanger 1 (NHE1), Na(+)/Ca(2+) exchanger 1 (NCX1) and calmodulin (CaM) inhibited the IL6 stimulation-induced intracellular pH recovery increases and NH4Cl acidification-induced intracellular Ca(2+) increases. IL6 stimulation also induced the structural interaction of NHE1, NCX1 and CaM proteins. The protein expression levels of NHE1, NCX1 and CaM in native human HCC tissues were markedly higher than those in normal liver tissues. IL6 upregulated the expressions of NHE1, NCX1 and CaM in Huh7 and HepG2 cells. NHE1, NCX1 and CaM mediated the promotion of IL6 on the proliferation, migration and invasion of Huh7 and HepG2 cells and the growth of HCC in nude mice. In conclusion, IL6 activates the functional activity of NHE1 and induces the functional and structural interaction of NHE1, NCX1 and CaM. The interaction of NHE1, NCX1 and CaM mediates the effects of IL6 on human HCC.

journal_name

Carcinogenesis

journal_title

Carcinogenesis

authors

Xu J,Ji B,Wen G,Yang Y,Jin H,Liu X,Xie R,Song W,Song P,Dong H,Tuo B

doi

10.1093/carcin/bgw004

subject

Has Abstract

pub_date

2016-03-01 00:00:00

pages

290-300

issue

3

eissn

0143-3334

issn

1460-2180

pii

bgw004

journal_volume

37

pub_type

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