| Budget Amount *help |
¥27,430,000 (Direct Cost: ¥21,100,000、Indirect Cost: ¥6,330,000)
Fiscal Year 2013: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2012: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2011: ¥9,750,000 (Direct Cost: ¥7,500,000、Indirect Cost: ¥2,250,000)
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| Research Abstract |
The aim of this study is to investigate the role of microRNAs (miRNAs) during gastric carcinogenesis and the feasibility of epigenetic therapy for gastric neoplasms.MiRNA microarray analyses revealed that miR-29c was significantly down-regulated in gastric cancers and that miR-142 and miR-155 were overexpressed in gastric MALT lymphomas. MiR-1246, miR-302a and miR-4448 were up-regulated by treatment of gastric cancer cells with EZH2 inhibitors such as SAHA and DZNep. In addition, we have developed a novel miRNA promoter microarray for chromatin immunoprecipitation (ChIP)-on-chip assay. Using this custom-made miRNA promoter microarray, we have successfully performed ChIP-on-chip assay to identify miRNAs regulated by histone modification. These results indicate that misexpression of miRNAs plays critical roles during gastric carcinogenesis and that epigenetic therapy with chromatin-modifying drugs exert multiple anti-cancer effects through activation of tumor-suppressor miRNAs.
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