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Departments of Internal Medicine, Pharmacology [C. M. W.], and Biochemistry [M. J. M.], The University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75235-8857
Responses to androgen vary widely among prostate cancers and prostatic carcinoma cell lines. We have explored the basis for this heterogeneity by examining the levels of androgen receptor expression in a prostate carcinoma cell line (LNCaP) that expresses the androgen receptor and two prostate carcinoma cell lines that do not contain detectable androgen receptor. We find that while the LNCaP cell line contains high levels of both the androgen receptor protein and mRNA, the receptor-negative cell lines DU-145 and PC-3 do not express androgen receptor protein as detected by immunoblotting or mRNA as detected by Northern analysis or S1 nuclease protection. These results indicate that the absence of androgen receptor expression in the androgen receptor-negative cell lines is caused by diminished androgen receptor mRNA levels. Genomic Southern analysis indicates that the differences in androgen receptor expression in each of these cell lines is not associated with detectable alterations in the structure of the androgen receptor gene.
1 This work was supported by a Basil O'Connor Award from the March of Dimes (5-694), the Medical Life and Health Insurance Medical Research Fund, the Welch Foundation (I-1090), a grant from the Perot Family Foundation, a grant from the American Cancer Society (IN-142), and Grant DK03892 from the NIH. M. J. M. is a Culpeper medical scholar. W. D. T. was a recipient of a C. J. Martin Fellowship from the National Health and Medical Research Council of Australia.
Received 3/23/90.
Revised 5/30/90.
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