Abstract:
:We have studied the effects of tamoxifen on the cell cycle kinetics of the endocrine-responsive MCF-7 human breast cancer cells. Tamoxifen inhibits proliferation of MCF-7 cells. The tritiated thymidine labeling index is markedly reduced by tamoxifen, indicating a reduction in the fraction of cells in S phase. Flow cytometry of mithramycin-stained cells reveals that cells accumulate in G1 phase, with a concomitant depletion of S- and G2-M-phase cells with tamoxifen. Mapping of G1-phase cells by morphology of prematurely condensed chromosomes demonstrated that tamoxifen-treated cells accumulate in early G1. These studies indicate that tamoxifen inhibits proliferation of MCF-7 human breast cancer cells by invoking a transition delay early in the G1 phase of the cell cycle.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Osborne CK,Boldt DH,Clark GM,Trent JMsubject
Has Abstractpub_date
1983-08-01 00:00:00pages
3583-5issue
8eissn
0008-5472issn
1538-7445journal_volume
43pub_type
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