Recombinant human interferon alpha increases oestrogen receptor expression in human breast cancer cells (ZR-75-1) and sensitises them to the anti-proliferative effects of tamoxifen

H. W. van den Berg, W. J. Leahey, M. Lynch, R. Clarke, J. Nelson

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84 Scopus citations

Abstract

Exposure of ZR-75-1 human breast cancer cells for 48 h to human recombinant interferon alpha (IFNα) resulted in increased expression of oestrogen receptors as measured in a whole cell binding assay. This effect was inversely proportional to dose being significant following treatment with 10-100 IU IFNml-l and was only observed at a low initial cell plating density. The extent of the increase in oestrogen receptor levels ranged from 1.2- to 7.2-fold following treatment with 10IUIFNml-1. No increase in progesterone receptor expression was observed under the same experimental conditions. Concentrations of IFN which increased oestrogen receptor levels had no effect on cell proliferation. IFN (500 IU ml-1) inhibited cell proliferation and the combination of this treatment with tamoxifen (2μM) had a greater anti-proliferative effect than either drug alone although there was no evidence of synergism. However, a 5-day pretreatment of cells with IFN (10IUml-1) markedly sensitised them to the growth-inhibiting effect of a subsequent 6-day exposure to tamoxifen.

Original languageEnglish (US)
Pages (from-to)255-257
Number of pages3
JournalBritish Journal of Cancer
Volume55
Issue number3
DOIs
StatePublished - Mar 1987
Externally publishedYes

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