Cited by 47Cannabis and Cannabinoid ResearchSexual Differentiation and DisordersNeuroendocrine regulation and behavior

Activation of Both CB1 and CB2 Endocannabinoid Receptors Is Critical for Masculinization of the Developing Medial Amygdala and Juvenile Social Play Behavior

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Argue, Kathryn J, VanRyzin, Jonathan W, Falvo, David J, Whitaker, Allison R, Yu, Stacey J, McCarthy, Margaret M·2017·eneuro

Abstract

Juvenile social play behavior is a shared trait across a wide variety of mammalian species. When play is characterized by the frequency or duration of physical contact, males usually display more play relative to females. The endocannabinoid system contributes to the development of the sex difference in social play behavior in rats. Treating newborn pups with a nonspecific endocannabinoid agonist, WIN55,212-2, masculinizes subsequent juvenile rough-and-tumble play behavior by females. Here we use specific drugs to target signaling through either the CB1 or CB2 endocannabinoid receptor (CB1R or CB2R) to determine which modulates the development of sex differences in play. Our data reveal that signaling through both CB1R and CB2R must be altered neonatally to modify development of neural circuitry regulating sex differences in play. Neonatal co-agonism of CB1R and CB2R masculinized play by females, whereas co-antagonism of these receptors feminized rates of male play. Because of a known role for the medial amygdala in the sexual differentiation of play, we reconstructed Golgi-impregnated neurons in the juvenile medial amygdala and used factor analysis to identify morphological parameters that were sexually differentiated and responsive to dual agonism of CB1R and CB2R during the early postnatal period. Our results suggest that sex differences in the medial amygdala are modulated by the endocannabinoid system during early development. Sex differences in play behavior are loosely correlated with differences in neuronal morphology.

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Crossref · 10.1523/eneuro.0344-16.2017

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  • If females are treated with CB1 and CB2 receptor agonists to mimic higher endocannabinoid levels, their newborn cell number and eventual play behavior is masculinized, even in the absence of testosterone.

    “If females are treated with CB1 and CB2 receptor agonists to “mimic” the higher endocannabinoid levels, their newborn cell number and eventual play behavior is masculinized, even in the absence of testosterone (Argue et al., 2017; VanRyzin et al., 2019).”

    From Developmental origins of sex differences in the neural circuitry of play (2020) · cites this paper as Argue et al., 2017

    The Results (Fig. 2; page not provided) show that neonatal coadministration of CB1 and CB2 agonists increased females’ juvenile play to male levels. The paper does not report that this combined treatment masculinized newborn cell number; its Discussion instead describes a prior finding involving a nonspecific agonist. It also does not test whether the effect occurs independently of testosterone. (LLM, conf=0.88)

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Authors
Argue, K. J., VanRyzin, J. W., Falvo, D. J., Whitaker, A. R., Yu, S. J., & McCarthy, M. M.
Affiliations
University of Maryland, Baltimore (US)
Corresponding author
Argue, Kathryn J
Venue
eneuro
Published
2017-01
Volume
4
Issue
1
Pages
ENEURO.0344-16.2017
ISSN
2373-2822 (ISSN-L)
OpenAlex
W2573093185
Cited by
47
References
91
Citations by year
2026: 2 · 2025: 4 · 2024: 3 · 2023: 3 · 2022: 6 · 2021: 10 · 2020: 7 · 2019: 3 · 2018: 5 · 2017: 4
FWCI
3.63
Type
journal article
Language
en
Open access
Locations
  • eNeuro (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • HHS | NIH | National Institute of Mental Health (100000025, RO1MH52716-020)
  • HHS | NIH | National Institute on Drug Abuse (100000026, RO1DA039062-01)
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Sexual Differentiation and Disorders
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
Keywords
endocannabinoid system, CB1 receptor, CB2 receptor, sex differences, social play, rough-and-tumble play, medial amygdala, masculinization, neuronal morphology, neonatal development, WIN 55,212-2
MeSH terms
Amygdala, Animals, Animals, Newborn, Female, Male, Neural Pathways, Neurons, Sex Characteristics, Social Behavior, Rats, Sprague-Dawley, Receptor, Cannabinoid, CB1, Receptor, Cannabinoid, CB2, Cannabinoid Receptor Modulators

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