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JNK pathway regulates estradiol-induced apoptosis in hormone-dependent human breast cancer cells

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Abstract

Estrogen is known to stimulate breast cancer development in humans. Ironically, high doses of estrogen can induce regression of hormone-dependent breast cancer in postmenopausal women. The mechanism by which estrogen induces tumour regression in breast cancer is still unknown. We found that under low growth-stimulated conditions, high concentrations of 17-β-estradiol (estradiol) induces apoptosis and concomitantly increases phosphorylation of c-jun in estrogen receptor (ER)-positive breast cancer cell line, MCF-7, but not in ER-negative breast cancer cell line MDA-MB 231 suggesting an ER-mediated event. Interestingly, when the c-jun NH2-terminal kinase (JNK) signalling pathway was disrupted by the JNK inhibitor SP600125, the ability of estradiol to inhibit the growth of MCF-7 cells and to induce apoptosis was completely blocked. These data suggest that JNK plays a central role in mediating the anticancer effect of high concentrations of estradiol in MCF-7 cells. Our data showing the apoptotic effect of estradiol in low growth-stimulated conditions suggest potential implications for the pharmacological control of breast cancer with high dose estrogen in postmenopausal women. Furthermore, our results indicate that augmenting JNK activity could be an efficient novel approach for treating breast cancer.

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Acknowledgements

This study was supported by Istanbul Science University Institute of Medical Sciences and Johns Hopkins University Institutional research grant.

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Authors and Affiliations

  1. Department of Pharmacology and Institute of Medical Sciences, Istanbul Science University Faculty of Medicine, Büyükdere Cad. No: 120, 34394, Esentepe-Istanbul, Turkey

    Nedret Altiok

  2. Department of Histology and Embryology, Istanbul Science University Faculty of Medicine and Institute of Medical Sciences, Istanbul, Turkey

    Meral Koyuturk

  3. Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, USA

    Soner Altiok

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  1. Nedret Altiok
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  2. Meral Koyuturk
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  3. Soner Altiok
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Correspondence to Nedret Altiok.

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Altiok, N., Koyuturk, M. & Altiok, S. JNK pathway regulates estradiol-induced apoptosis in hormone-dependent human breast cancer cells. Breast Cancer Res Treat 105, 247–254 (2007). https://doi.org/10.1007/s10549-006-9451-1

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  • DOI: https://doi.org/10.1007/s10549-006-9451-1

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