Cited by 33Neuropeptides and Animal PhysiologyNeurobiology and Insect Physiology ResearchHypothalamic control of reproductive hormones

Localization and functional characterization of a novel adipokinetic hormone in the mollusk, Aplysia californica

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Johnson, Joshua I., Kavanaugh, Scott I., Nguyen, Cindy, Tsai, Pei-San·2014·PLoS ONE

Abstract

Increasing evidence suggests that gonadotropin-releasing hormone (GnRH), corazonin, adipokinetic hormone (AKH), and red pigment-concentrating hormone all share common ancestry to form a GnRH superfamily. Despite the wide presence of these peptides in protostomes, their biological effects remain poorly characterized in many taxa. This study had three goals. First, we cloned the full-length sequence of a novel AKH, termed Aplysia-AKH, and examined its distribution in an opisthobranch mollusk, Aplysia californica. Second, we investigated in vivo biological effects of Aplysia-AKH. Lastly, we compared the effects of Aplysia-AKH to a related A. californica peptide, Aplysia-GnRH. Results suggest that Aplysia-AKH mRNA and peptide are localized exclusively in central tissues, with abdominal, cerebral, and pleural ganglia being the primary sites of Aplysia-AKH production. However, Aplysia-AKH-positive fibers were found in all central ganglia, suggesting diverse neuromodulatory roles. Injections of A. californica with Aplysia-AKH significantly inhibited feeding, reduced body mass, increased excretion of feces, and reduced gonadal mass and oocyte diameter. The in vivo effects of Aplysia-AKH differed substantially from Aplysia-GnRH. Overall, the distribution and biological effects of Aplysia-AKH suggest it has diverged functionally from Aplysia-GnRH over the course of evolution. Further, that both Aplysia-AKH and Aplysia-GnRH failed to activate reproduction suggest the critical role of GnRH as a reproductive activator may be a phenomenon unique to vertebrates.

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Authors
Johnson, J. I., Kavanaugh, S. I., Nguyen, C., & Tsai, P.-S.
Affiliations
University of Colorado Boulder (US)
Corresponding author
Tsai, Pei-San
Venue
PLoS ONE
Published
2014-08-27
Volume
9
Issue
8
Pages
e106014
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2092667036
Cited by
33
References
67
Citations by year
2026: 1 · 2025: 1 · 2023: 4 · 2022: 1 · 2020: 3 · 2019: 6 · 2018: 2 · 2017: 5 · 2016: 10
FWCI
2.28
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Science Foundation (0743818)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurobiology and Insect Physiology Research
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
Keywords
adipokinetic hormone, Aplysia californica, neuropeptide localization, neuromodulation, feeding inhibition, body mass reduction, fecal excretion, oocyte size, functional divergence, peptide evolution
MeSH terms
Amino Acid Sequence, Animals, Aplysia, Base Sequence, Body Weight, Feeding Behavior, Gonadotropin-Releasing Hormone, Molecular Sequence Data, Oligopeptides, Oocytes, Pyrrolidonecarboxylic Acid, RNA, Messenger, Gene Expression, Ganglia, Invertebrate, Evolution, Molecular

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