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Lamprey GnRH-III stimulates FSH secretion in barrows.

Abstract
Although studies have indicated that follicle-stimulating hormone (FSH) and luteinizing hormone (LH) release can be dissociated in the pig, the underlying mechanisms are still to be answered. Since it was demonstrated that lamprey gonadotropin-releasing hormone (l-GnRH-III) has preferential FSH-releasing potency in several mammalian species, we have investigated the gonadotropin-releasing activity of l-GnRH-III in barrows. Each of nine barrows (body weight: 85-90 kg; age: 207 days) received 2 ml saline (S-barrow), followed by 150 microg l-GnRH-III (1.6-1.7 microg/kg body weight) dissolved in 2 ml saline intramuscularly 7 days later. Three pre-treatment and 13 post-treatment blood samples were taken at intervals of 30 min to 8 h to assess basal and treatment-associated concentrations of FSH and LH, respectively, by radioimmunoassay. Animals were defined as having responded to treatment if, 2 h post-treatment, plasma FSH and/or LH levels were >3 SD of the respective basal concentrations. There was no treatment-associated FSH response after saline treatment, but a clear FSH response in all l-GnRH-III-injected barrows. On average, the maximum FSH level (205% of the basal concentration) was observed at 1 h post-treatment. Mean FSH values were elevated until 10 h post-treatment. There was no LH response either to saline or to l-GnRH-III. In conclusion, this study demonstrates a selective FSH-releasing activity of 150 microg l-GnRH-III in barrows. Further studies are needed to investigate whether this effect is ubiquitous in the pig and what the physiological relevance is.
AuthorsJ Kauffold, F Schneider, W Zaremba, K-P Brüssow
JournalReproduction in domestic animals = Zuchthygiene (Reprod Domest Anim) Vol. 40 Issue 5 Pg. 475-9 (Oct 2005) ISSN: 0936-6768 [Print] Germany
PMID16149955 (Publication Type: Journal Article)
Chemical References
  • Oligopeptides
  • gonadotropin-releasing hormone-III
  • Gonadotropin-Releasing Hormone
  • Luteinizing Hormone
  • Follicle Stimulating Hormone
  • Pyrrolidonecarboxylic Acid
Topics
  • Animals
  • Area Under Curve
  • Follicle Stimulating Hormone (metabolism)
  • Gonadotropin-Releasing Hormone (administration & dosage, pharmacology)
  • Injections, Intramuscular (veterinary)
  • Kinetics
  • Lampreys
  • Luteinizing Hormone (drug effects, metabolism)
  • Male
  • Oligopeptides (administration & dosage, pharmacology)
  • Pyrrolidonecarboxylic Acid (administration & dosage, analogs & derivatives, pharmacology)
  • Radioimmunoassay (methods, veterinary)
  • Swine (physiology)

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