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Helodermin stimulates prolactin secretion in the rat.

H Koshiyama1, Y Kato, T Inoue

  • 1Department of Medicine, Kyoto University Faculty of Medicine, Japan.

European Journal of Pharmacology
|September 11, 1987
PubMed
Summary
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Helodermin, a peptide hormone, significantly increases pituitary prolactin (PRL) secretion in rats. Its potency in elevating PRL levels is comparable to vasoactive intestinal polypeptide (VIP).

Area of Science:

  • Endocrinology
  • Neuroscience
  • Peptide Hormone Research

Background:

  • Helodermin belongs to the secretin/vasoactive intestinal polypeptide (VIP)/peptide histidine isoleucine (PHI) family of peptides.
  • Pituitary prolactin (PRL) secretion plays a crucial role in various physiological processes.

Purpose of the Study:

  • To investigate the effect of helodermin on pituitary prolactin (PRL) secretion in rats.
  • To compare the PRL-releasing potency of helodermin with related peptides like PHI and VIP.

Main Methods:

  • Administration of helodermin via intracerebroventricular (i.c.v.) or intravenous (i.v.) injection in urethane-anesthetized male rats.
  • Measurement of plasma PRL levels to assess secretion response.

Main Results:

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  • Helodermin induced a dose-related increase in plasma PRL levels.
  • Helodermin demonstrated greater potency than rat and porcine PHI in raising PRL levels.
  • Helodermin's potency was found to be as effective as VIP in stimulating PRL secretion.

Conclusions:

  • Helodermin acts as a potent stimulator of pituitary prolactin secretion in rats.
  • Helodermin represents a significant factor in the regulation of PRL release, comparable to VIP.