| Project/Area Number |
21591674
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
General surgery
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| Research Institution | Nagoya City University |
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Principal Investigator |
TOYAMA Tatsuya 名古屋市立大学, 大学院・医学研究科, 准教授 (30315882)
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| Co-Investigator(Kenkyū-buntansha) |
YAMASHITA Hiroko 名古屋市立大学, 大学院・医学研究科, 准教授 (70332947)
SUGIURA Hiroshi 名古屋市立大学, 大学院・医学研究科, 研究員 (20381882)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2009: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | 乳癌 / マイクロRNA / エストロゲン・レセプター / miR-206 / エストロゲン・レセプターα |
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| Research Abstract |
Several microRNAs(miRNAs) that directly target ERα have been identified. In this study, expression levels of miRNAs that directly target ERα, including miR-18a, miR-18b, miR-22, miR-193b, miR-206, miR-221/222 and miR-302c, were analyzed in human breast cancer samples by quantitative reverse transcription-PCR analysis. Correlations between the expression levels of these miRNAs and clinicopathological factors were analyzed. miR-18a expression was much higher in ERα-negative than in ERα-positive tumors, with the expression levels of miR-18a not differing in ERα-positive breast cancer as a function of ERαprotein level. Surprisingly, the expression levels of miR-193b and miR-221 were significantly lower in ERα-negative than in ERα-positive tumors, and the levels of these miRNAs gradually increased as ERα protein expression increased. Our results suggest that miR-206 could be a novel candidate for endocrine therapy that targets only ERα in breast cancer.
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