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Effects of neuropeptide Y (NPY) and NPY agonists on lordosis in the female guinea pig

Endocrine volume 5, pages 169–177 (1996)Cite this article

Abstract

We have previously shown that an NPY antagonist decreases lordosis behavior and that this decrease can be reversed with NPY administration. The present experiments examined whether intracerebroventricular (icv) administration of NPY would facilitate lordosis behavior and whether it would increase feeding behavior in the female guinea pig. Additionally, we examined whether icv administration of a more specific NPY Y1 and/or Y2 receptor agonist would facilitate lordosis behavior. Although NPY (1 μg) increased feeding behavior when it was administered to the lateral ventricle of ovariectomized (ovx) estrogen (i.e., estradiol benzoate; EB) and progesterone- (P) treated guinea pigs, it had no facilitatory effect on lordosis behavior at any of the doses tested (0.5, 1, 5, or 10μg). In fact, the lower doses had a small, delayed inhibitory effect. NPY also had no effect on lordosis in females treated with EB alone. In contrast, the NPY Y1 agonist (Leu31Pro34) NPY significantly facilitated lordosis in ovx EB- and P-treated females. It had no effect in ovx females treated with EB alone. The NPY Y2 agonist NPY (13–36) had a slight, delayed inhibitory effect in ovx EB- and P-treated females. These data are consistent with the hypothesis that NPY can act at a number of receptor subtypes to affect lordosis behavior, and that NPY can facilitate lordosis behavior by acting at Y1 receptors. Furthermore, it appears that this facilitatory effect of Y1 receptors is an effect on some progesterone-mediated component of lordosis, as the Y1 agonist facilitated EB- and P-induced lordosis, but not that induced with EB alone.

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Affiliations

  1. Neuroscience/Biopsychology Program, Oberlin College, 44074, Oberlin, OH

    Janice E. Thornton, Laurie Holcomb, Sarah Leupen & Linda Kimbrough

  2. Department of Biology, Oberlin College, Oberlin, OH

    Janice E. Thornton

Authors
  1. Janice E. Thornton
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  2. Laurie Holcomb
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  3. Sarah Leupen
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  4. Linda Kimbrough
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Correspondence to Janice E. Thornton.

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Thornton, J.E., Holcomb, L., Leupen, S. et al. Effects of neuropeptide Y (NPY) and NPY agonists on lordosis in the female guinea pig. Endocr 5, 169–177 (1996). https://doi.org/10.1007/BF02738703

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  • DOI: https://doi.org/10.1007/BF02738703

Key Words

  • Neuropeptide Y
  • lordosis
  • guinea pig
  • reproduction
  • feeding
  • estrogen
  • progesterone