Cited by 60Hypothalamic control of reproductive hormonesReproductive biology and impacts on aquatic speciesNeuropeptides and Animal Physiology

Gonadotropin-releasing hormone-like molecule is not an acute reproductive activator in the gastropod, Aplysia californica

Tsai, Pei-San, Sun, Biao, Rochester, Johanna R., Wayne, Nancy L.·2010·General and Comparative Endocrinology

Abstract

Gonadotropin-releasing hormone (GnRH) is indispensable for reproductive activation in all vertebrates. Although several GnRH-like molecules have been isolated from non-chordates, the function of GnRH in these taxa remains unclear. We previously isolated the full-length cDNA sequence of a prohormone containing a GnRH-like molecule, termed ap-GnRH, from the gastropod mollusk, Aplysia californica. In this study, we characterized the distribution and quantity of ap-GnRH peptide in several central and peripheral tissues of A. californica. Further, we performed in vivo and in vitro studies to explore the function of ap-GnRH in these animals. Immunohistochemistry and radioimmunoassay using specific antisera against ap-GnRH showed that pedal ganglia contained the highest level of ap-GnRH peptide, followed by cerebral ganglia, abdominal ganglia, and then buccal ganglia. Ovotestis did not contain detectable levels of ap-GnRH peptide. Injection of sexually mature and immature animals with synthetic ap-GnRH over a course of 10-14 days had no effects on ovotestis mass, reproductive tract mass, egg-laying, and penile eversion. ap-GnRH also failed to alter oocyte growth and egg-laying hormone accumulation and secretion. Interestingly, ap-GnRH injection triggered acute behavioral responses including the stimulation of parapodial opening, inhibition of feeding, and promotion of substrate attachment. Our results showed that in A. californica, ap-GnRH could modulate a wide range of behavioral attributes. Most strikingly, ap-GnRH is not involved in the acute activation of reproduction in a fashion similar to vertebrate GnRH.

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Crossref · 10.1016/j.ygcen.2009.09.009

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Authors
Tsai, P.-S., Sun, B., Rochester, J. R., & Wayne, N. L.
Affiliations
  • University of Colorado Boulder (US)
  • University of California, Los Angeles (US)
Venue
General and Comparative Endocrinology
Publisher
Elsevier BV
Published
2010-04
Volume
166
Issue
2
Pages
280-288
ISSN
0016-6480 (ISSN-L)
OpenAlex
W1977872165
Cited by
60
References
47
Citations by year
2026: 2 · 2025: 2 · 2024: 3 · 2023: 2 · 2022: 2 · 2021: 3 · 2020: 4 · 2019: 5 · 2018: 2 · 2017: 6 · 2016: 7 · 2015: 4 · 2014: 1 · 2013: 6 · 2012: 4
FWCI
3.90
Type
journal article
Language
en
Open access
closed
Locations
  • General and Comparative Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Reproductive biology and impacts on aquatic species
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
Keywords
gonadotropin-releasing hormone, Aplysia californica, gastropod reproduction, ovotestis, pedal ganglia, egg-laying behavior, feeding inhibition, substrate adhesion
MeSH terms
Animals, Aplysia, Behavior, Animal, Gonads, Gonadotropin-Releasing Hormone, Reproduction, Ganglia, Invertebrate

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