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• W2063882679 abstract "Various hormone refractory prostate cancer cell models have been established with androgen depletion and have helped to clarify the mechanism for the transition into androgen-depletion independent status. However, the mechanism of bicalutamide resistance remains unclear because few cell models have been generated.We generated a bicalutamide-resistant subline, LNCaP-BC2, from LNCaP after prolonged treatment with bicalutamide. Androgen and/or bicalutamide responsiveness for proliferation and prostate-specific antigen (PSA) secretion were examined in vitro and in vivo. Testosterone and dihydrotestosterone (DHT) levels in xenografted tumors were analyzed by liquid chromatography-tandem mass spectrometry. Androgen receptor (AR) gene mutation and amplification and AR and pAR(210) expression were determined.LNCaP-BC2 did not grow in an androgen-depleted medium and proliferation was stimulated in a tenfold lower concentration of androgen than that of LNCaP. LNCaP-BC2 grew in castrated male mice, and the DHT level in grafted LNCaP-BC2 tumors was 7.7-fold lower than in LNCaP tumors. Bicalutamide stimulated LNCaP-BC2 proliferation and PSA secretion in vitro and the antitumor activity of bicalutamide against LNCaP-BC2 was weaker than that of LNCaP in vivo. Additional AR mutation and AR gene amplification were not detected in LNCaP-BC2, but AR and pAR(210) expression and PSA secretion in LNCaP-BC2 were higher than in LNCaP.Bicalutamide-resistant LNCaP-BC2 exhibited AR overexpression and hypersensitivity to low levels of androgen. Our data suggests that AR overexpression is a significant mechanism of bicalutamide resistance similar to resistance from chronic androgen depletion. In addition, pAR(210) overexpression could be a potential mechanism for hypersensitivity to low androgen in LNCaP-BC2." @default.
• W2063882679 created "2016-06-24" @default.
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• W2063882679 date "2010-01-07" @default.
• W2063882679 modified "2023-09-26" @default.
• W2063882679 title "Prolonged treatment with bicalutamide induces androgen receptor overexpression and androgen hypersensitivity" @default.
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• W2063882679 doi "https://doi.org/10.1002/pros.21107" @default.
• W2063882679 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20058237" @default.
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