MYO5B is epigenetically silenced and associated with MET signaling in human gastric cancer.

Abstract:

BACKGROUND:Our previous study has shown that MYO5B is downregulated in gastric cancer. However, the mechanism by which the expression of MYO5B was inhibited remains unknown. METHODS:Inspection of the human MYO5B locus uncovered a large and dense CpG island within the 5' region of this gene. Methylation-specific PCR (MSP) and bisulfite sequencing (BSP) were used for determination of MYO5B promoter methylation in gastric cancer cell lines and gastric cancer samples. Involvement of histone H3 methylation in those cell lines were examined by ChIP assay. RESULTS:The densely methylated MYO5B promoter region was confirmed by MSP and BSP. Enhanced gene expression was detected when the cells were treated with the DNA-demethylating agent 5-aza-2'-deoxycytidine (DAC) and trichostatin A (TSA), a histone deacetylase inhibitor. Knockdown of MYO5B expression in gastric cancer cells expressing endogenous MYO5B inhibits HGF-stimulated MET degradation, concomitant with sustained c-MET levels and signaling. CONCLUSION:The results of our study showed for the first time that MYO5B is epigenetically silenced in gastric cancer cells by aberrant DNA methylation and histone modification. Inactivation of MYO5B expression in gastric cancer cells expressing endogenous MYO5B inhibits HGF-stimulated MET degradation, concomitant with sustained c-MET levels and signaling.

journal_name

Dig Dis Sci

authors

Dong W,Wang L,Shen R

doi

10.1007/s10620-013-2600-6

subject

Has Abstract

pub_date

2013-07-01 00:00:00

pages

2038-45

issue

7

eissn

0163-2116

issn

1573-2568

journal_volume

58

pub_type

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