Abstract:
:Retinoids have been shown to inhibit the growth of a number of human tumor cells, including several ovarian adenocarcinoma cell lines. All-trans retinoic acid (RA) is an effective growth suppressor of CA-OV3 cells but not SK-OV3 cells. Since the effects of RA are known to be mediated via the nuclear receptors (RARs and RXRs), we initially compared levels of the various RARs and RXRs in the CA-OV3 and SK-OV3 cell lines. The RA resistant SK-OV3 cells expressed reduced levels of RAR-alpha and RXR-alpha. Furthermore, induction of RAR-alpha by RA was impaired in the RA resistant SK-OV3 cells as was RARE binding and RARE-dependent transcriptional activity. These results suggested that changes in the amounts and/or activity of RARs and/or RXR-alpha could determine the growth response of ovarian tumor cells to RA. This was confirmed by modulating the levels of RARs and RXR-alpha in the SK-OV3 cells using the LacSwitch inducible expression system. Stably transfected clones of RA resistant SK-OV3 cells exhibited a significant inhibition of growth by RA treatment when RAR-alpha was induced. Overexpression of both RAR-alpha and RXR-alpha resulted in a level of growth inhibition nearly equal to that exhibited by the RA sensitive CA-OV3 cell line. Similar results were obtained when a combination of RXR-alpha and either RAR-beta or RAR-gamma was overexpressed in SK-OV3 cells. Our results show that the nuclear receptors and RXR-alpha play a critical role in mediating growth suppression by RA in ovarian cancer cells.
journal_name
Oncogenejournal_title
Oncogeneauthors
Wu S,Zhang D,Zhang ZP,Soprano DR,Soprano KJdoi
10.1038/sj.onc.1202208subject
Has Abstractpub_date
1998-12-03 00:00:00pages
2839-49issue
22eissn
0950-9232issn
1476-5594journal_volume
17pub_type
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