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- W2040394713 abstract "MicroRNAs act as negative regulators of gene expression, and the altered expression of microRNAs by epigenetic mechanisms is strongly implicated in carcinogenesis. Here we report that the microRNA-10b gene (miR-10b) was silenced in gastric cancer cells by promoter methylation. In this study, using a methylation array and bisulfate pyrosequencing analysis, we found that miR-10b promoter CpGs were heavily methylated in gastric cancers. Clinicopathologic data showed that miR-10b methylation increased with patient age and occurred significantly more frequently in intestinal-type (28/44, 64%) than in diffuse-type (22/56, 39%) gastric cancers (P = 0.016). In addition, miR-10b methylation was also associated with an increase in expression of the oncogene that encodes microtubule-associated protein, RP/EB family, member 1 (MAPRE1; P = 0.004), which was identified as a potential miR-10b target. After 5-aza-2'-deoxycytidine treatment of gastric cancer cells, miR-10b methylation was significantly decreased, and expression of miR-10b and HOXD4, which is 1 kb downstream of miR-10b, was greatly restored. Moreover, decreased MAPRE1 expression coincided with increased miR-10b expression, suggesting that miR-10b targets MAPRE1 transcription. We also found that transfection with precursor miR-10b into gastric cancer cells dramatically decreased MAPRE1 mRNA and protein, resulting in a significant decrease in colony formation and cell growth rates. Thus, we show a tumor-suppressive role for miR-10b in gastric carcinogenesis. miR-10b methylation may be a useful molecular biomarker for assessing the risk of gastric cancer development, and modulation of miR-10b may represent a therapeutic approach for treating gastric cancer." @default.
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- W2040394713 date "2011-06-01" @default.
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- W2040394713 title "Epigenetic regulation of<i>microRNA-10b</i>and targeting of oncogenic<i>MAPRE1</i>in gastric cancer" @default.
- W2040394713 doi "https://doi.org/10.4161/epi.6.6.15874" @default.
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