Journal Article

Up-regulation of TRPM-2, MMP-7 and ID-1 during sex hormone-induced prostate carcinogenesis in the Noble rat

X.S. Ouyang, X. Wang, D.T.W. Lee, S.W. Tsao and Y.C. Wong

in Carcinogenesis

Volume 22, issue 6, pages 965-973
Published in print June 2001 | ISSN: 0143-3334
Published online June 2001 | e-ISSN: 1460-2180 | DOI:
Up-regulation of TRPM-2, MMP-7 and ID-1 during sex hormone-induced prostate carcinogenesis in the Noble rat

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Prostate cancer is the most frequently diagnosed malignancy in the Western world and changes in the ratio of testosterone and estrogens with advancing age is one of the potential risk factors in the development of this disease. However, the molecular mechanisms associated with hormone imbalance in prostate carcinogenesis are poorly understood. In this study we induced a high incidence of prostate hyperplasia, dysplasia and adenocarcinoma in the Noble rat using a combination of testosterone and estradiol-17β. Using this animal model, we studied the gene expression profile during sex hormone-induced prostate carcinogenesis using a cDNA array technique; the results were further confirmed by RT–PCR, western blotting and immunohistochemical analyses. We found up-regulation of TRPM-2 (testosterone-repressed prostatic message-2), MMP-7 (matrix metalloproteinase-7) and Id-1 (inhibitor of differentiation or DNA binding) during development of sex hormone-induced prostate cancer. Increased expression of TRPM-2 and MMP-7 was observed in both premalignant and malignant tissues after sex hormone treatment, indicating their role in the early stages of hormone response and prostate cancer development. In contrast, Id-1 was expressed at relatively low levels in all premalignant samples but increased in malignant cells, suggesting its potential roles as a biomarker for prostate cancer cells. Furthermore, expression of Id-1 appeared to be stronger in poorly differentiated lesions than in well-differentiated carcinomas, suggesting that the levels of Id-1 expression may be correlated with the malignancy of tumors. Our results provide the first evidence of up-regulation of TRPM-2, MMP-7 and Id-1 during sex hormone-induced prostate carcinogenesis and strongly suggest their association with the development of prostate cancer.

Keywords: E2, estradiol-17β; H&E, hematoxylin and eosin; HLH, helix–loop–helix; IGF-1, insulin-like growth factor-1; LP, lateral prostate; PBS, phosphate-buffered saline; T, testosterone; VEGF, vascular endothelial growth factor.

Journal Article.  6885 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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