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Adenosine A1 receptor, a target and regulator of estrogen receptorα action, mediates the proliferative effects of estradiol in breast cancer

Oncogene volume 29, pages 1114–1122 (2010)Cite this article

Abstract

Estrogen receptor-α (ERα) and its ligand estradiol (E2) has critical roles in breast cancer growth and are key therapeutic targets. In this study, we report a novel dual role of the adenosine A1 receptor (Adora1) as an E2/ERα target and a regulator of ERα transcriptional activity. In ERα-positive breast cancer cells, E2 upregulated Adora1 messenger RNA (mRNA) and protein levels, an effect that was reversed by the E2 antagonist ICI 182 780. Small interference RNA ablation of Adora1 in ERα-positive cells reduced basal and E2-dependent proliferation, whereas Adora1 over-expression in an ERα-negative cell line induced proliferation. The selective Adora1 antagonist, DPCPX, reduced proliferation, establishing Adora1 as a mediator of E2/ERα-dependent breast cancer growth. Intriguingly, Adora1 ablation decreased both mRNA and protein levels of ERα and, consequently, estrogen-responsive element-dependent ERα transcriptional activity. Moreover, Adora1 ablation decreased binding activity of ERα to the promoter of its target gene TFF1 and led to reduced TFF1 promoter activity and mRNA levels, suggesting that Adora1 is required for full transcriptional activity of ERα on E2 stimulation. Taken together, we showed a short feed-forward loop involving E2, ERα and Adora1 that favors breast cancer growth. These data suggest that Adora1 may represent an important target for therapeutic intervention in hormone-dependent breast cancer.

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Acknowledgements

This study was supported by grants from the NIH (R01CA067167), AVON Foundation, Lynn Sage Foundation, and Northwestern Memorial Foundation. We thank Megha Reddi for expert technical assistance.

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Authors and Affiliations

  1. Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA

    Z Lin, P Yin, S Reierstad, M O'Halloran, J S Coon V, E K Pearson & S E Bulun

  2. Department of Medicine, Division of Pulmonary and Critical Care Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA

    G M Mutlu

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  1. Z Lin
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Correspondence to S E Bulun.

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Lin, Z., Yin, P., Reierstad, S. et al. Adenosine A1 receptor, a target and regulator of estrogen receptorα action, mediates the proliferative effects of estradiol in breast cancer. Oncogene 29, 1114–1122 (2010). https://doi.org/10.1038/onc.2009.409

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