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Complex Actions of Estradiol-3-Sulfate in Late Gestation Fetal Brain

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Abstract

The most abundant form of estrogen circulating in fetal plasma is sulfo-conjugated estrogen; for example, estradiol-3-sulfate (E2SO4) is more highly abundant than estradiol (E2). The present study investigated the ontogeny of the deconjugating (steroid sulfatase [STS]) and conjugating (estrogen sulfotransferase [STF]) enzymes in ovine fetal brain and tested the hypothesis that treatment with E2SO4 would alter the expression of one or both enzymes. Steroid sulfatase was more highly expressed than STF, and both changed as a function of gestational age. Estradiol-3-sulfate infused intracerebroventricularly (icv) significantly increased plasma adrenocorticotropic hormone (ACTH) and cortisol concentrations. Plasma E2 and E2SO4 were increased, and brain expression of estrogen receptor α was decreased. The proteins STS and STF were up- and downregulated, respectively. Pituitary proopiomelanocortin (POMC) and follicle-stimulating hormone (FSH) and hypothalamic corticotrophin-releasing hormone (CRH) messenger RNA (mRNA) was decreased. We conclude that E2SO4 has complex actions on the fetal brain, which might involve deconjugation by STS, but that the net result of direct E2SO4 icv infusion is more complex than can be accounted for by infusion of E2 alone.

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Authors and Affiliations

  1. Department of Physiology and Functional Genomics, University of Florida College of Medicine, PO Box 100274, Gainesville, FL, 32610, USA

    Jared Winikor BS, Christine Schlaerth PhD, Maria Belen Rabaglino DVM, Roderick Cousins BS, Monique Sutherland BS & Charles E. Wood PhD

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  1. Jared Winikor BS
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  2. Christine Schlaerth PhD
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  3. Maria Belen Rabaglino DVM
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  4. Roderick Cousins BS
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  5. Monique Sutherland BS
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  6. Charles E. Wood PhD
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Correspondence to Charles E. Wood PhD.

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Winikor, J., Schlaerth, C., Rabaglino, M.B. et al. Complex Actions of Estradiol-3-Sulfate in Late Gestation Fetal Brain. Reprod. Sci. 18, 654–665 (2011). https://doi.org/10.1177/1933719110395400

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