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- W2023200976 abstract "The 41- and 43-kDa mitogen-activated protein kinases (MAPK; ERK2 and ERK1, respectively) play pivotal roles in the mitogenic signal transduction pathway. We previously demonstrated that constitutive activation of the MAPK cascade was related to the carcinogenesis of human tumors. In this study, we examined whether constitutive activation of MAPK was related to the progression to androgen independence of prostate cancer.MAPK activation was examined by the appearance of phosphorylated forms and an in vitro kinase assay in four human (androgen-dependent and independent) prostate cancer cell lines and rat prostate cancer cell line Dunning (androgen-sensitive G line, and androgen-independent AT-3, AT-6 sublines). In addition, when androgen-dependent mouse Shionogi Carcinoma 115 (SC115) cells were serially cultured without androgen to obtain androgen-independent cells, the time and degree of MAPK activation were examined.One of three human androgen-independent cell lines (DU145) showed constitutive activation of MAPK, while an androgen-dependent cell line (LNCaP) did not show MAPK activation. While MAPK were not activated in an androgen-sensitive Dunning G cell line, MAPK were activated in androgen-independent sublines (AT-3 and AT-6) derived from a G cell line. In addition, when SC115 cells were serially cultured without androgen, the cells 16-24 weeks after androgen removal showed MAPK activation. Furthermore, in subcloned cells, MAPK activation was observed even in the cells maintained for 9 weeks in medium without testosterone.The present fi ndings suggest that constitutive activation of MAPK may be associated with the acquisition of hormone independence in prostate cancer and that clonal selection after androgen removal and hormone-independent growth through the MAPK signal transduction pathway could begin at a relatively early period in the individual cells." @default.
- W2023200976 created "2016-06-24" @default.
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- W2023200976 date "2005-10-01" @default.
- W2023200976 modified "2023-10-10" @default.
- W2023200976 title "Constitutive activation of the 41- and 43-kDa mitogen-activated protein (MAP) kinases in the progression of prostate cancer to an androgen-independent state" @default.
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- W2023200976 doi "https://doi.org/10.1111/j.1442-2042.2005.01164.x" @default.
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