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Conditional Over-Expression of Estrogen Receptor Alpha in a Transgenic Mouse Model

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Abstract

Attempts to delineate the mechanisms of estrogen action have promoted the creation of several estrogen receptor alpha (ERα) mouse models in the past decade. These traditional models are limited by the fact that the receptors are either absent or present throughout all stages of development. The purpose of this work was to develop a conditional transgenic model that would provide an in vivo method of controlling the spatial and temporal regulation of ERα expression. The tetracycline responsive system was utilized. Three lines of transgenic mice carrying a transgene composed of the coding sequence for murine ERα placed under the regulatory control of a tet operator promoter (tet-op) were generated. These three lines of tet-op-mERα mice were each mated to an established line of transgenic mice expressing a tetracycline-dependent transactivator protein (tTA) from the mouse mammary tumor virus-long terminal repeat (MMTV-LTR). Double transgenic MMTV-tTA/tet-op-mERα mice were produced. All three lines demonstrated dominant gain of ERα shown by RT-PCR, immunoprecipitation, and immunohistochemistry. Transgene-specific ERα was expressed in numerous tissues including the mammary gland, salivary gland, testis, seminal vesicle, and epididymis. Expression was silenced by administration of doxycycline in the drinking water. This model can be utilized to evaluate the consequences of ERα dominant gain in targeted tissues at specific times during development. In this study dominant gain of ERα was associated with a reduction in epididymal/vas deferens and seminal vesicle weights consistent with the proposed action of ERα on fluid transport in the male reproductive tract. Combining this model with other dominant gain and gene knockout mouse models will be useful for testing effects of ERα action in combination with specific gene products and to evaluate if developmental and stage-specific expression of ERα can rescue identified phenotypes in gene knockout mice.

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Authors and Affiliations

  1. Department of Epidemiology and Preventive Medicine, School of Medicine, University of Maryland, Baltimore, Baltimore, MD, 21201, USA

    Kathleen S. Hruska & Jodi A. Flaws

  2. Institute of Human Virology, School of Medicine, University of Maryland, Baltimore, Baltimore, MD, 21201, USA

    Kathleen S. Hruska, Maddalena T. Tilli, Shuxun Ren, Ion Cotarla, Theresa Kwong, Minglin Li & Priscilla A. Furth

  3. Graduate Program in Human Genetics, School of Medicine, University of Maryland, Baltimore, Baltimore, MD, 21201, USA

    Maddalena T. Tilli & Priscilla A. Furth

  4. Graduate Program in Molecular and Cellular Biology, School of Medicine, University of Maryland, Baltimore, Baltimore, MD, 21201, USA

    Shuxun Ren, Minglin Li & Priscilla A. Furth

  5. Department of Medicine, School of Medicine, University of Maryland, Baltimore, Baltimore, MD, 21201, USA

    Ion Cotarla & Priscilla A. Furth

  6. Department of Physiology, School of Medicine, University of Maryland, Baltimore, Baltimore, MD, 21201, USA

    Joseph D. Fondell, Robert D. Koos & Priscilla A. Furth

  7. Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, Baltimore, MD, 21201, USA

    Judy A. Hewitt

  8. Lombardi Cancer Center, Georgetown University, Research Building, Room E518, 3970 Reservoir Road NW, Washington, D.C, 20007

    Priscilla A. Furth

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  1. Kathleen S. Hruska
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Correspondence to Priscilla A. Furth.

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Hruska, K.S., Tilli, M.T., Ren, S. et al. Conditional Over-Expression of Estrogen Receptor Alpha in a Transgenic Mouse Model. Transgenic Res 11, 361–372 (2002). https://doi.org/10.1023/A:1016376100186

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