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Androgen ablation induces programmed death of androgen-dependent prostatic glandular cells, resulting in fragmentation of their genomic DNA and the cells themselves into apoptotic bodies. Twenty percent of prostatic glandular cells undergo programmed death per day between day 2 and 5 after castration. During this same period, &lt; 1% of prostatic glandular cells enter the S phase of the cell cycle, documenting that &gt; 95% of these die in G0. During the programmed death of these G0 glandular cells, a futile DNA repair process is induced secondary to the DNA fragmentation. This futile DNA repair is not required, however, since inhibition of this process by &gt; 90% with an appropriately timed hydroxy-urea dosing regimen had no effect upon the extent of the programmed death of these cells after castration. Likewise, p53 gene expression is not required since the same degree of cell death occurred in prostates and seminal vesicles after castration of wild-type and p53-deficient mice.

Cell proliferation, DNA repair, and p53 function are not required for programmed death of prostatic glandular cells induced by androgen ablation.