PACAP participates in the regulation of the hormonal events preceeding the ovulation

Katalin Köves, Judith Molnár, Orsolya Kántor, A. Lakatos, T. J. Görcs, Anikó Sdmogyvári-Vigh, Zsuzsa Fürst, A. Arimura

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21 Citations (Scopus)

Abstract

Pituitary adenylate cyclase activating polypeptide (PACAP) is a member of the secretin family. It was isolated and characterized in 1989. Its neuroendocrine role was demonstrated in vivo and in vitro systems. It seems that in vivo the effect of PACAP on the gonadotrop hormone secretion depends on the route of administration. It was reported that intravenous (iv) injection of PACAP elevated, while intra-cerebro-ventricular (icv) administration depressed plasma LH levels. In the present study it was demonstrated that PACAP, administered icv before the critical period of the proestrous stage, blocked the ovulation and prevented the proestrous LH surge in rats. The blocking effect of PACAP is not directly mediated by endogenous opioids because the antagonizing effect of Naloxone, an opioid receptor antagonist, was questionable. Under our experimental conditions we could not confirm the stimulating effect of iv administered PACAP.

Original languageEnglish
Pages (from-to)239-249
Number of pages11
JournalActa biologica Hungarica
Volume47
Issue number1-4
Publication statusPublished - Dec 1 1996

Keywords

  • LH
  • Ovulation
  • PACAP
  • RIA
  • Rat

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Environmental Science(all)
  • Neurology

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    Köves, K., Molnár, J., Kántor, O., Lakatos, A., Görcs, T. J., Sdmogyvári-Vigh, A., Fürst, Z., & Arimura, A. (1996). PACAP participates in the regulation of the hormonal events preceeding the ovulation. Acta biologica Hungarica, 47(1-4), 239-249.