2006 Fiscal Year Final Research Report Summary
Roles of Hormonal pathways in cell proliferation and hyperplasia in the human prostate
| Project/Area Number |
16390460
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Urology
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| Research Institution | Nihon University (2005-2006)
The University of Tokyo (2004) |
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Principal Investigator |
TAKAHASHI Satoru Nihon University School of Medicine, Professor, 医学部, 教授 (50197141)
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| Co-Investigator(Kenkyū-buntansha) |
INOUE Satoshi Tokyo University Faculty of Medicine, Professor, 医学部附属病院, 教授 (40251251)
URANO Tomohiko Tokyo University Faculty of Medicine, Assistant, 医学部附属病院, 助手 (20334386)
KUME Haruki Tokyo University Faculty of Medicine, Assistant professor, 医学部附属病院, 講師 (10272577)
MATSUMOTO Shinya Tokyo University Faculty of Medicine, Assistant, 医学部附属病院, 助手 (50345196)
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| Project Period (FY) |
2004 – 2006
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| Keywords | estrogen / estrogen receptor / EBAG9 / 14-3-3σ / prostate / estrogen-related receptor / CYP2B6 / androgen |
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| Research Abstract |
We investigated hormonal pathways involving in cell proliferation of prostatic epithelium and cancer. We especially focused on the roles of estrogen receptors (ERs)α ＆ β, and a newly identified estrogen responsive gene; EBAG 9. We found a positive role of ERα in cancer cell proliferation, which is mediated by increased EBAG 9 expression and down-regulation of 14-3-3a. In contrast, ERβ showed suppressive effects on cancer cell proliferation and progression. Decreased or lost expression of ERβ significantly correlated with advanced pathological stages and higher Gleason scores, even poor prognosis. Recently identified estrogen-related receptor (ERR) α was found to be often down-regulated in prostate cancer, and a negative predictor for patient prognosis. We also identified crucial roles of not only testosterone, but also its metabolite for prostatic cell proliferation and cancer progression. Cytochrome P450 2B6 (CYP2B6), which plays an important role in the degeneration of testosterone, was found to be down-regulated in prostatic cancer tissue. CYP2B6 is likely to be regulated by ERRα and constitutive androstane receptor (CAR), and a prognostic factor of prostatic cancer.
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[Journal Article] Cytochrome P450 2B6 as a prognostic factor for human prostate cancer.2007
Author(s)
Kumagai J, Fujimura T, Takahashi S, Urano T, Ogushi T, Horie-Inoue K, Ouchi Y, Kitamura T, Muramatsu M, Blumberg B, Inoue S
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Journal Title
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] 14-3-3sigma is down-regulated in human prostate cancer.2004
Author(s)
Urano T, Takahashi S, Suzuki T, Fujimura T, Fujita M, Kumagai J, Horie-Inoue K, Sasano H, Kitamura T, Ouchi Y, Inoue S
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Journal Title
Biochem. Biophys. Res. Commun. 319
Pages: 795-800
Description
「研究成果報告書概要(欧文)」より
