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Vasoactive intestinal peptide (VIP) mediates the effect of estrogens on the dopaminergic tone in the hypothalamic-pituitary axis of ovariectomized (OVX) rats

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Abstract

The role of vasoactive intestinal peptide (VIP) in the regulation of dopamine (DA) concentration in mediobasal hypothalamus (MBH), posterior and anterior pituitary of ovariectomized (OVX) estrogenized rats was studied using passive immunization against VIP with a specific antiserum (a-VIP). Chronic estradiol administration decreased DA concentration in MBH, and in posterior and anterior pituitary, compared to OVX control rats. DA tissue concentration increased following a-VIP administration to control and estrogenized OVX rats. In vitro study of VIP and a-VIP on DA release from MBH in chronically estrogenized OVX rats showed that estrogens decreased DA evoked-release from MBH; a-VIP increased DA evoked-release from MBH of control OVX and estrogenized rats. VIP decreased DA evoked-release from MBH of OVX rats, but had no effect on estrogenized rats. VIP decreased DA tissue concentration in MBH of OVX control but not of estrogenized rats. It is suggested that VIP decreases DA synthesis and release from hypothalamic neurons in female rats, and that VIP partially mediates the inhibitory effect of long-term estrogen administration on DA release from MBH.

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Authors and Affiliations

  1. Centro de Investigaciones en Reproducción, Facultad de Medicina, Piso 10, Universidad de Buenos Aires, 1121, Buenos Aires, Argentina

    Mercedes Lasaga, Adriana Seilicovich, Daniel Pisera, María del Carmen Díaz, Marcelo F. Befumo & Beatriz H. Duvilanski

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  1. Mercedes Lasaga
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  2. Adriana Seilicovich
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  3. Daniel Pisera
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  4. María del Carmen Díaz
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  5. Marcelo F. Befumo
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  6. Beatriz H. Duvilanski
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Correspondence to Mercedes Lasaga.

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Lasaga, M., Seilicovich, A., Pisera, D. et al. Vasoactive intestinal peptide (VIP) mediates the effect of estrogens on the dopaminergic tone in the hypothalamic-pituitary axis of ovariectomized (OVX) rats. Endocr 6, 53–56 (1997). https://doi.org/10.1007/BF02738802

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  • DOI: https://doi.org/10.1007/BF02738802

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