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. 2000 Nov;83(9):1183–1191. doi: 10.1054/bjoc.2000.1388

Loss of growth inhibitory effects of retinoic acid in human breast cancer cells following long-term exposure to retinoic acid

R Stephen 1, P D Darbre 1
PMCID: PMC2363575  PMID: 11027432

Abstract

Although retinoids are known to be inhibitory to breast cancer cell growth, a key remaining question is whether they would remain effective if administered long-term. We describe here the long-term effects of all-trans retinoic acid on two oestrogen-dependent human breast cancer cell lines MCF7 and ZR-75-1. Although both cell lines were growth inhibited by retinoic acid in the short-term in either the absence or the presence of oestradiol, prolonged culture with 1 μM all-trans retinoic acid resulted in the cells acquiring resistance to the growth inhibitory effects of retinoic acid. Time courses showed that oestrogen deprivation of the cell lines resulted in upregulation of the basal non-oestrogen stimulated growth rate such that cells learned to grow at the same rate without as with oestradiol, but the cells remained growth inhibited by retinoic acid throughout. Addition of 1 μM all-trans retinoic acid to steroid deprivation conditions resulted in reproducible loss of growth response to both retinoic acid and oestradiol, although the time courses were separable in that loss of growth response to retinoic acid preceded that of oestradiol. Loss of growth response to retinoic acid did not involve loss of receptors, ER as measured by steroid binding assay or RARα as measured by Northern blotting. Function of the receptors was retained in terms of the ability of both oestradiol and retinoic acid to upregulate pS2 gene expression, but there was reduced ability to upregulate transiently transfected ERE- and RRE-linked reporter genes. Despite the accepted role of IGFBP3 in retinoic acid-mediated growth inhibition, progression to retinoic acid resistance occurred irrespective of level of IGFBP3, which remained high in the resistant MCF7 cells. Measurement of AP1 activity showed that the two cell lines had markedly different basal AP1 activities, but that progression to resistance was accompanied in both cases by a lost ability of retinoic acid to reduce AP1 activity. These results warn of potential resistance which could arise on long-term treatment with retinoic acid in a clinical situation and echo the problems of progression to endocrine resistance. It seems that whatever the constraints imposed on growth, these cells have a remarkable ability to escape from growth inhibition. However, the ability of retinoic acid to delay progression to oestrogen resistance is encouraging for endocrine therapy, and the concentration-dependence of retinoic acid resistance suggests that progression is not absolute but could be manipulated by dose. © 2000 Cancer Research Campaign

Keywords: retinoic acid, breast cancer cells

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Selected References

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