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• W2096790906 abstract "All-trans-retinoic acid (trans-RA) and other retinoids exert anticancer effects through two types of retinoid receptors, the RA receptors (RARs) and retinoid X receptors (RXRs). Previous studies demonstrated that the growth-inhibitory effects of trans-RA and related retinoids are impaired in certain estrogen-independent breast cancer cell lines due to their lower levels of RARα and RARβ. In this study, we evaluated several synthetic retinoids for their ability to induce growth inhibition and apoptosis in both trans-RA-sensitive and trans-RA-resistant breast cancer cell lines. Our results demonstrate that RXR-selective retinoids, particularly in combination with RAR-selective retinoids, could significantly induce RARβ and inhibit the growth and induce the apoptosis of trans-RA-resistant, RARα-deficient MDA-MB-231 cells but had low activity against trans-RA-sensitive ZR-75-1 cells that express high levels of RARα. Using gel retardation and transient transfection assays, we found that the effects of RXR-selective retinoids on MDA-MB-231 cells were most likely mediated by RXR-nur77 heterodimers that bound to the RA response element in the RARβ promoter and activated the RARβ promoter in response to RXR-selective retinoids. In contrast, growth inhibition by RAR-selective retinoids in trans-RA-sensitive, RARα-expressing cells most probably occurred through RXR-RARα heterodimers that also bound to and activated the RARβ promoter. In MDA-MB-231 clones stably expressing RARα, both RARβ induction and growth inhibition by RXR-selective retinoids were suppressed, while the effects of RAR-selective retinoids were enhanced. Together, our results demonstrate that activation of RXR can inhibit the growth of trans-RA-resistant MDA-MB-231 breast cancer cells and suggest that low cellular RARα may regulate the signaling switch from RAR-mediated to RXR-mediated growth inhibition in breast cancer cells." @default.
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• W2096790906 date "1997-11-01" @default.
• W2096790906 modified "2023-10-18" @default.
• W2096790906 title "Inhibition of <i>trans</i>-Retinoic Acid-Resistant Human Breast Cancer Cell Growth by Retinoid X Receptor-Selective Retinoids" @default.
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• W2096790906 doi "https://doi.org/10.1128/mcb.17.11.6598" @default.
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