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- W2000561241 abstract "Age-dependent epithelial cell hyperplasia in the dorsal and lateral lobes of Brown Norway rats is analogous to benign prostatic hyperplasia in aging men. A major question is whether differential lobe-specific and age-dependent proliferation of cells, rather than cell survival, contributes to the hyperplasia. Although serum testosterone (T) levels decline in aged rats, active cell proliferation was detected as Ki67-positive cells in the dorsal and lateral lobes. We determined whether androgens differentially affect cell proliferation and cell-cycle regulatory proteins in the prostate lobes of young and aged rats. Castrated rats were treated with different doses of T to restore serum levels to those of intact young or aged rats. Rates of cell proliferation, measured by 5-bromodeoxyuridine labeling, peaked after 3-d T treatment in all lobes. 5-bromodeoxyuridine-labeling indices were higher in the dorsal and lateral lobes of aged than of young rats with equivalent serum T levels. No age-dependent difference was seen in the ventral lobe. Cell proliferation was marked by increased levels of cyclins D1 and E and cyclin-dependent kinases 4 and 6, decreased p27 and increased phosphorylation of Rb. Levels of cyclins D1 and E were higher in the dorsal and lateral lobes of intact and T-treated aged than young rats. Confocal immunofluorescent microscopy documented changes in cyclin-dependent kinase 4 and cyclin D1 subcellular localization. Cyclin D1 nuclear localization correlated with the time frame for cell proliferation. In conclusion, rates of cell proliferation and levels of cell-cycle regulatory proteins that control the G1/S transition exhibit lobe-specific and age-dependent differences in response to androgens." @default.
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- W2000561241 date "2007-10-25" @default.
- W2000561241 modified "2023-09-27" @default.
- W2000561241 title "Cell Proliferation and Expression of Cell Cycle Regulatory Proteins that Control the G1/S Transition Are Age Dependent and Lobe Specific in the Brown Norway Rat Model of Prostatic Hyperplasia" @default.
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- W2000561241 doi "https://doi.org/10.1210/en.2007-1259" @default.
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