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Background

Gastric cancer (GC) has an unwelcoming prognosis when diagnosed at an advanced stage. The purpose of this study was to examine the expression of myosin heavy chain 11 (MYH11) in GC and mechanisms related.

Methods

The MYH11 expression in GC was investigated via the SangerBox platform. MYH11 expression in GC tissues and cell lines was examined by immunohistochemistry, RT-qPCR, and western blot. The relationship between MYH11 expression and patients' prognosis was analyzed. The effects of MYH11 on the biological behaviors of GC cells were investigated by gain-of-function experiments. Bioinformatics analysis was used to find genes with relevance to MYH11 expression in GC. The relationship was verified by luciferase and ChIP-qPCR assays, followed by rescue assay validation. The causes of MYH11 downregulation in GC were verified by quantitative methylation-specific PCR. Finally, the effect of MYH11 on tumor growth was examined.

Results

MYH11 was downregulated in GC and predicted poor prognoses. MYH11 reverted the malignant phenotype of GC cells. MYH11 repressed the TNFRSF14 expression by binding to the TNFRSF14 promoter. TNFRSF14 reversed the inhibitory effect of MYH11 on the malignant phenotype of GC cells. The methylation of the MYH11 promoter was elevated in GC, which was correlated with the elevated DNMT3B in GC. Overexpression of DNMT3B repressed transcription of MYH11 by promoting its methylation. Also, MYH11 upregulation inhibited tumor growth.

Conclusion

DNMT3B inhibits MYH11 expression by promoting its DNA methylation, thereby attenuating the repressive effect of MYH11 on the transcriptional of TNFRSF14 and promoting the progression of GC."xsd:string
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http://purl.uniprot.org/citations/34380460http://purl.uniprot.org/core/author"Liu L."xsd:string
http://purl.uniprot.org/citations/34380460http://purl.uniprot.org/core/author"Hao Y."xsd:string
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http://purl.uniprot.org/citations/34380460http://purl.uniprot.org/core/author"Yu T."xsd:string
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http://purl.uniprot.org/citations/34380460http://purl.uniprot.org/core/title"Interaction between DNMT3B and MYH11 via hypermethylation regulates gastric cancer progression."xsd:string
http://purl.uniprot.org/citations/34380460http://purl.uniprot.org/core/volume"21"xsd:string
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