title: 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.
  
  
  CONCLUSIONS
  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.
authors: Department of Internal Medicine-Oncology, The First Affiliated Hospital, Zhengzhou University, Zhengzhou, China.
authors: Wenjie
authors: W
authors: Dong
authors: Liping
authors: L
authors: Wang
authors: Ruizhe
authors: R
authors: Shen
mesh_terms: D014408:Biomarkers, Tumor / Q000235:genetics* / Q000378:metabolism; D045744:Cell Line, Tumor; D047369:Chromatin Immunoprecipitation; D018899:CpG Islands; D019175:DNA Methylation; D015536:Down-Regulation; D005455:Fluorescent Antibody Technique; D015972:Gene Expression Regulation, Neoplastic; D020868:Gene Silencing; D006657:Histones / Q000378:metabolism; D006801:Humans; D018995:Myosin Heavy Chains / Q000235:genetics* / Q000378:metabolism; D024701:Myosin Type V / Q000235:genetics* / Q000378:metabolism; D016133:Polymerase Chain Reaction; D019859:Proto-Oncogene Proteins c-met / Q000378:metabolism*; D013274:Stomach Neoplasms / Q000235:genetics* / Q000378:metabolism
chemical_list: D014408:Biomarkers, Tumor; D006657:Histones; C505832:MYO5B protein, human; C491743:MET protein, human; D019859:Proto-Oncogene Proteins c-met; D024701:Myosin Type V; D018995:Myosin Heavy Chains