Sequence-dependent antagonism between tamoxifen and methotrexate in human breast cancer cells.

Abstract:

:High-dose methotrexate (MTX) cytotoxicity is decreased in MCF-7 breast cancer cells when the chemoendocrine agent tamoxifen (TAM) is given to cells 24 hours prior to MTX (early TAM). However, when breast cancer cells are exposed to TAM 24 hours after MTX (delayed TAM), MTX cytotoxicity is enhanced by TAM. The growth of cells exposed to 10 microM TAM and 10 microM MTX alone or in combination with early TAM plus MTX had the following order: TAM > TAM (early) + MTX > MTX. The percentages of control rates for TAM, MTX, and TAM (early) + MTX are 74.71 +/- 1.36%, 22.13 +/- 2.76%, and 38.17 +/- 2.75%, respectively. The inhibitory sequence from cells exposed to MTX + TAM (delayed TAM), MTX and TAM alone is MTX + TAM (delayed TAM) > MTX > TAM; and the percentages of control rates were 16.87 87% (MTX + TAM [delayed TAM]), 25.92 +/- 2.14% (MTX), and 54.08 +/- 14.79% (TAM). These studies suggest that: (a) the interactions between TAM and MTX are sequence-dependent; (b) TAM antagonizes the effect of MTX when TAM administration precedes MTX; and (c) TAM enhances the effect of MTX when TAM administration follows MTX.

journal_name

Anticancer Res

journal_title

Anticancer research

authors

Bowen D,Southerland WM,Hawkins M Jr,Johnson DH

subject

Has Abstract

pub_date

2000-05-01 00:00:00

pages

1415-7

issue

3A

eissn

0250-7005

issn

1791-7530

journal_volume

20

pub_type

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