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• W2080559619 abstract "Using a whole cell assay system, the androgen binding capacity of canine prostatic epithelial cells was evaluated in relation to their function. Radiolabeled Methyltrienolone (R1881) was used as the ligand in the presence of an excess of Triamcinolone acetonide and the amount of [3H]R1881 bound to the cells at equilibrium was determined by either displacement or saturation studies. With immature cells in culture (3 days of attachment), displacement analysis revealed the presence of high affinity binding sites which were also present in cells cultured for 10 days. With freshly dispersed prostatic cells (mostly secretory epithelial cells) as well as with older cells in culture (17 and 24 days), only less specific binding sites were observed with both unlabeled R1881 and/or dihydrotestosterone (DHT). In contrast, only the high affinity androgen receptor (AR) was present in cytosolic extracts prepared from normal glands. Displacement studies performed with cultured cells at different stages of growth also showed that the basal level as well as the degree of low affinity binding increased during the maturation of non-proliferating cells. The presence of multiple binding components was demonstrated by saturation studies performed with either cultured or freshly dispersed cells. The first component, that was saturated at 5 nM of [3H]R1881, was due to AR while the other two binding components, showing positive-cooperativity (Hill coefficients of 1.90 and 5.07, respectively), were saturated at concentrations of 15 and 30 nM of [3H]R1881. In contrast, the Hill coefficient for the AR was 0.88 indicating the presence of an independent component. It was calculated that only 11.4% of the total uptake of R1881 was attributed to AR binding, suggesting that the remainder may represent an intracellular pool of androgens. Thus, a whole cell binding assay represents a dynamic system for the detection, by saturation studies, of binding components that are not revealed using the conventional displacement studies or cell-free systems. It is proposed that these acceptor sites may play a role in differentiated prostatic function rather than in cell proliferation." @default.
• W2080559619 created "2016-06-24" @default.
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• W2080559619 date "1988-12-01" @default.
• W2080559619 modified "2023-10-17" @default.
• W2080559619 title "Multiple binding components for methyltrienolone in canine prostatic epithelial cells" @default.
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• W2080559619 doi "https://doi.org/10.1016/0022-4731(88)90338-x" @default.
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