Molecular correlates of bcl-2-enhanced growth following androgen-ablation in prostate carcinoma cells in vivo.

Abstract:

:Androgen-independent growth of prostate cancer is correlated with expression of bcl-2. The impact of bcl-2 expression on the growth of prostate cancer cells following androgen ablation, was examined in the androgen-sensitive prostatic carcinoma cell line, LNCaP. Vector control and bcl-2 expressing LNCaP cells were grown subcutaneously in male nude mice. Tumor volume, apoptosis, and proliferation were assessed following castration. The levels of c-myc, p53, p21, bax, and bcl-2 protein were assessed by Western blotting. Bcl-2 expressing tumors exhibited a significant augmentation in growth compared to controls (p 0.01). No difference in the spontaneous rate of proliferation was observed between bcl-2 and control tumors, however, bcl-2 expressing tumors exhibited lower rates of apoptosis. Following orchiectomy the apoptotic index remained significantly lower in bcl-2 expressing tumors (p 0.002 at day 3). The proliferative index was maintained in bcl-2 expressing, but not control tumors following castration. This resulted in a significant growth advantage in bcl-2 tumors subsequent to androgen ablation (p 0.001). These changes were accompanied by alterations in the levels of gene products known to regulate the cell cycle and/or apoptosis. These results emphasize the significance of bcl-2 expression during prostate cancer progression and suggest possible mechanisms for the acquisition of androgen-independent tumor growth.

journal_name

Int J Mol Med

authors

Beham AW,Sarkiss M,Brisbay S,Tu SM,von Eschenbach AC,McDonnell TJ

doi

10.3892/ijmm.1.6.953

subject

Has Abstract

pub_date

1998-06-01 00:00:00

pages

953-9

issue

6

eissn

1107-3756

issn

1791-244X

journal_volume

1

pub_type

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