Abstract:
:Both retinoids and anti-estrogens inhibit breast cancer cell proliferation with accumulation of cells in the G1 phase of the cell cycle, but the effect of retinoids is delayed compared to that of anti-estrogens. To determine whether this temporal difference is due to a simple delay in the action of retinoids on a common site or to different sites of action within the G1 phase, we studied the cell cycle effects of retinoic acid (RA) and the anti-estrogen ICI 164384 (ICI) in T-47D cells partially synchronized by mevalonic acid rescue of lovastatin-induced cell cycle arrest. We found that cells entering the cell cycle semi-synchronously after mevalonic acid rescue of lovastatin treatment were immediately susceptible to ICI but not RA. This suggests that RA may act at a point up-stream and ICI at a point down-stream of lovastatin action. Consistent with this, cells recommencing cell cycle progression after RA treatment were susceptible to the effects of lovastatin, while cells pre-treated with ICI then rescued with estradiol were not. In addition, cells rescued from cell cycle arrest induced by either RA, ICI or lovastatin entered S phase with the same kinetics. Our findings suggest, first, that within G1, RA acts before and ICI acts after the point of lovastatin action and, second, that despite these differences in the initiation of cell cycle arrest, the final nature of the cell cycle arrest is similar. Hence, retinoids and anti-estrogens may be expected to target different cell cycle-regulatory molecules to initiate cell cycle arrest, while overcoming this arrest may be accomplished by the activation of a common molecular pathway.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Wilcken NR,Musgrove EA,Sutherland RLdoi
10.1002/(sici)1097-0215(19970127)70:3<291::aid-ijcsubject
Has Abstractpub_date
1997-01-27 00:00:00pages
291-6issue
3eissn
0020-7136issn
1097-0215pii
10.1002/(SICI)1097-0215(19970127)70:3<291::AID-IJCjournal_volume
70pub_type
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