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Estrogen receptor alpha (ERα) phospho-serine-118 is highly expressed in human uterine leiomyomas compared to matched myometrium

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Abstract

It is thought that the growth of uterine leiomyomas may be mediated by the interaction of estrogen receptor alpha (ERα) and growth factor pathways and that phosphorylation of ERα at serine 118 (ERα-phospho-Ser118) is important in this interaction. In this study, immunoblotting and immunohistochemistry were used to investigate the expression of ERα-phospho-Ser118, phosphorylated p44/42 mitogen-activated protein kinase (phospho-p44/42 MAPK), and proliferating cell nuclear antigen (PCNA) in human leiomyoma and myometrial tissues during the proliferative and secretory phases of the menstrual cycle. We found that tumors taken from the proliferative phase expressed significantly higher levels of ERα-phospho-Ser118, phospho-p44/42 MAPK, and PCNA compared to patient-matched myometria and had significantly higher ERα-phospho-Ser118 and PCNA expression compared to secretory phase tumors. Also, enhanced colocalization and association of phospho-p44/42 MAPK and ERα-phospho-Ser118 were observed in proliferative phase tumors by confocal microscopy and immunoprecipitation, respectively. These data suggest that ERα-phospho-Ser118 may be important in leiomyoma growth and is possibly phosphorylated by phospho-p44/42 MAPK.

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Acknowledgments

The authors would like to thank Norris Flagler, Elizabeth Ney, Paul Cacioppo, and C. Jeffrey Tucker for their technical assistance with imaging. This research was supported, in part, by the Intramural Research Program of the NIH, National Institute of Environmental Health Sciences.

Conflict of interest statement

We declare that we have no conflict of interest.

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Authors and Affiliations

  1. Cellular and Molecular Pathology Branch, National Institute of Environmental Health Sciences (NIEHS), National Toxicology Program (NTP), National Institutes of Health (NIH), Department of Health and Human Services (DHHS), P.O. Box 12233, MD C2-09, Research Triangle Park, NC, 27709, USA

    Tonia L. Hermon, Alicia B. Moore, Linda Yu & Darlene Dixon

  2. Biostatistics Branch, National Institute of Environmental Health Sciences (NIEHS), National Toxicology Program (NTP), National Institutes of Health (NIH), Department of Health and Human Services (DHHS), Research Triangle Park, NC, 27709, USA

    Grace E. Kissling

  3. Department of Physiological Sciences, Division of Biochemistry, Eastern Virginia Medical School, Norfolk, VA, 23507, USA

    Tonia L. Hermon & Frank J. Castora

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  1. Tonia L. Hermon
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Correspondence to Darlene Dixon.

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Hermon, T.L., Moore, A.B., Yu, L. et al. Estrogen receptor alpha (ERα) phospho-serine-118 is highly expressed in human uterine leiomyomas compared to matched myometrium. Virchows Arch 453, 557–569 (2008). https://doi.org/10.1007/s00428-008-0679-5

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  • DOI: https://doi.org/10.1007/s00428-008-0679-5

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