Dht virus 26




















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To investigate the effect of androgen on viral replication, LNCaP cells were cultured in triplicate in well plates in hormone-depleted medium for 2 days, until cells were nearly confluent, to minimize the effect of DHT on cell numbers. After 3 h of incubation, cells were washed once with phosphate-buffered saline PBS and treated with DHT in fresh hormone-depleted medium for 2 days.

Cell numbers were determined, and conditioned cell medium was collected for reverse transcriptase RT assays performed with poly rA as a template and oligo dT as a primer The relative RT activities of radiolabeled reaction products were determined with a Storm phosphorimager Sunnyvale, CA.

Virus replication in DU cells was not affected by DHT, due to the absence of the androgen receptor in these cells data not shown. XMRV replication is stimulated by androgen and suppressed by antiandrogens. Experiments were done as described for panel A, except infections were for 3 days.

Experiments were repeated two or three times, and each individual experiment was done in triplicate. RT activities were determined with conditioned cell medium. The cell numbers shown are per well. Inhibition of XMRV replication by antiandrogens suggests that viral growth could also be suppressed in XMRV-infected prostate cancer patients during androgen ablation therapy. Recently, we reported that XMRV integration sites in human prostate tumors include many cancer-related genes 8 , XMRV has a strong preference for integrating near transcriptional start sites, possibly imposing androgen responsiveness on host genes.

XMRV has been observed in both prostatic stromal 19 and epithelial carcinoma 11 , 15 cells. Therefore, XMRV integration into stromal and epithelial cells could cause androgen stimulation of proinflammatory genes and proto-oncogenes leading to cancer. In addition, because the androgen receptor is expressed in prostatic cells, these findings could also help to explain why XMRV infections localize to the prostate. National Center for Biotechnology Information , U.

Journal List J Virol v. J Virol. Published online Nov Beihua Dong and Robert H. Robert H. Author information Article notes Copyright and License information Disclaimer. Phone: Fax: E-mail: gro. Received Aug 20; Accepted Nov 4. This article has been cited by other articles in PMC. Abstract Xenotropic murine leukemia virus-related virus XMRV is a gammaretrovirus originally identified in a subset of prostate cancer patients. Open in a separate window.

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