Adenoviral-mediated PTEN transgene expression sensitizes Bcl-2-expressing prostate cancer cells to radiation.

Abstract:

:Bcl-2 is associated with resistance to radiotherapy in prostate cancer. It was recently demonstrated that transduction of LNCaP prostate cells with the PTEN gene resulted in Bcl-2 downregulation. We hypothesized that forced expression of PTEN in prostate cancer cells would sensitize cells to radiation, downregulate Bcl-2 expression, and potentiate the G2M block induced by radiation. Four cell lines - PC-3-Bcl-2 (Bcl-2 overexpression, deleted PTEN), PC-3-Neo (wild-type Bcl-2, deleted PTEN), LNCaP (Bcl-2 overexpression, deleted PTEN), and DU-145 (wild-type Bcl-2 and PTEN) - were transduced with a recombinant adenovirus-5 vector expressing the human wild-type PTEN cDNA under the control of a human cytomegalovirus promoter (Ad-MMAC). After correction for the effect of Ad-MMAC on plating efficiency, Ad-MMAC treatment reduced the surviving fractions after 2 Gy as follows: PC-3-Bcl-2, from 60.5 to 3.6%; PC-3-Neo, no reduction; LNCaP, from 29.6 to 16.3%; and DU-145, from 32.7 to 25.7%. PTEN expression was associated with the downregulation of Bcl-2 expression in PC-3-Bcl-2 and LNCaP cell lines. Ad-MMAC plus radiotherapy potentiated the G2M block seen with radiotherapy alone only in PC-3-Bcl-2 cells. These findings suggest that overexpression of Bcl-2 result in radioresistance and inability of radiation to cause its typical G2M cell-cycle arrest.

journal_name

Cancer Gene Ther

journal_title

Cancer gene therapy

authors

Rosser CJ,Tanaka M,Pisters LL,Tanaka N,Levy LB,Hoover DC,Grossman HB,McDonnell TJ,Kuban DA,Meyn RE

doi

10.1038/sj.cgt.7700673

subject

Has Abstract

pub_date

2004-04-01 00:00:00

pages

273-9

issue

4

eissn

0929-1903

issn

1476-5500

pii

7700673

journal_volume

11

pub_type

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