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 Oncoljournal_title
International journal of oncologyauthors
Choi SH,Kang HK,Im EO,Kim YJ,Bae YT,Choi YH,Lee KH,Chung HY,Chang HK,Kim NDdoi
10.3892/ijo.17.5.971keywords:
subject
Has Abstractpub_date
2000-11-01 00:00:00pages
971-6issue
5eissn
1019-6439issn
1791-2423journal_volume
17pub_type
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