Inhibition of cell growth and telomerase activity of breast cancer cells in vitro by retinoic acids.

Abstract:

:The effects of retinoic acid (RA) and its analogs, all-trans RA, 9-cis RA and 13-cis RA, were investigated in human breast cancer MCF-7 cells and immortalized breast epithelial cell line MCF-10A. RA inhibited the telomerase activity of MCF-7 cells in a wide range of concentrations. RA at 10 microM also inhibited the growth of MCF-7 cells in a time-dependent manner. However, no significant growth inhibition was found between untreated control and RA-treated MCF-10A cells. Moreover, a marked inhibition of telomerase activity by RA was detected early in MCF-7 cells (after 24 h of RA treatment), which was preceded by a reduction of hTERT mRNA expression (after 12 h of RA treatment). However, MCF-10A cells showed a reduction of telomerase activity and down-regulation of hTERT after 4 days of RA treatment. Simultaneous changes in hTERT mRNA expression and telomerase activity were found for MCF-10A cells. The expressions of hTR and hTEP1 telomerase component genes were not changed after RA treatment. These results indicate that the anti-breast cancer activity of RA could be mediated by its ability to down-regulate the expression of hTERT telomerase gene.

journal_name

Int J Oncol

authors

Choi SH,Kang HK,Im EO,Kim YJ,Bae YT,Choi YH,Lee KH,Chung HY,Chang HK,Kim ND

doi

10.3892/ijo.17.5.971

keywords:

subject

Has Abstract

pub_date

2000-11-01 00:00:00

pages

971-6

issue

5

eissn

1019-6439

issn

1791-2423

journal_volume

17

pub_type

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