Cited by 282Cannabis and Cannabinoid ResearchNeuroinflammation and Neurodegeneration MechanismsNeuroendocrine regulation and behavior

Microglial phagocytosis of newborn cells is induced by endocannabinoids and sculpts sex differences in juvenile rat social play

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VanRyzin, Jonathan W., Marquardt, Ashley E., Argue, Kathryn J., Vecchiarelli, Haley A., Ashton, Sydney E., Arambula, Sheryl E., Hill, Matthew N., McCarthy, Margaret M.·2019·Neuron

Abstract

Brain sex differences are established developmentally and generate enduring changes in circuitry and behavior. Steroid-mediated masculinization of the rat amygdala during perinatal development produces higher levels of juvenile rough-and-tumble play by males. This sex difference in social play is highly conserved across mammals, yet the mechanisms by which it is established are unknown. Here, we report that androgen-induced increases in endocannabinoid tone promote microglia phagocytosis during a critical period of amygdala development. Phagocytic microglia engulf more viable newborn cells in males; in females, less phagocytosis allows more astrocytes to survive to the juvenile age. Blocking complement-dependent phagocytosis in males increases astrocyte survival and prevents masculinization of play. Moreover, increased astrocyte density in the juvenile amygdala reduces neuronal excitation during play. These findings highlight novel mechanisms of brain development whereby endocannabinoids induce microglia phagocytosis to regulate newborn astrocyte number and shape the sexual differentiation of social circuitry and behavior. VIDEO ABSTRACT.

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Crossref · 10.1016/j.neuron.2019.02.006

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  • Blocking testosterone by using an androgen receptor antagonist in females treated with testosterone completely prevents these effects.

    “Similarly, blocking testosterone by using an androgen receptor antagonist in females treated with testosterone completely prevents these effects (VanRyzin et al., 2019).”

    From Developmental origins of sex differences in the neural circuitry of play (2020) · cites this paper as VanRyzin et al., 2019

    The Results section ('Testosterone Programs 2-AG Content…'; page not provided) reports that flutamide, an androgen receptor antagonist, prevented the testosterone-induced increase in amygdala 2-AG in female pups. It does not show that flutamide completely prevented the other reported effects on newborn cells, microglial phagocytosis, or social play; the play experiment instead used cannabinoid receptor antagonists. (LLM, conf=0.85)

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  • Lower astrocyte density in the MeA is correlated with male-typical levels of play.

    “Lower astrocyte density in the MeA is correlated for male-typical levels of play (VanRyzin et al., 2019).”

    From Developmental origins of sex differences in the neural circuitry of play (2020) · cites this paper as VanRyzin et al., 2019

  • 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 VanRyzin et al., 2019

  • Studies investigating neural underpinnings of this behavioral sex difference have identified various nodes within the larger circuitry of social behavior, including the medial amygdala and lateral septum, which exert sex-specific influences on play following sexual differentiation early in life as part of typical brain development.

    “Studies investigating the neural underpinnings of this behavioral sex difference have identified various nodes within the larger circuitry of social behavior, including the medial amygdala (VanRyzin et al., 2019) and lateral septum (Bredewold et al., 2014), which exert sex-specific influences on play following sexual differentiation early in life as part of typical brain development.”

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Authors
VanRyzin, J. W., Marquardt, A. E., Argue, K. J., Vecchiarelli, H. A., Ashton, S. E., Arambula, S. E., Hill, M. N., & McCarthy, M. M.
Affiliations
  • University of Maryland, Baltimore (US)
  • University of Calgary (CA)
Corresponding author
McCarthy, Margaret M.
Venue
Neuron
Publisher
Elsevier BV
Published
2019-04
Volume
102
Issue
2
Pages
435-449.e6
ISSN
0896-6273 (ISSN-L)
OpenAlex
W2918315099
Cited by
272
References
65
Citations by year
2026: 20 · 2025: 31 · 2024: 48 · 2023: 44 · 2022: 41 · 2021: 36 · 2020: 38 · 2019: 14
FWCI
19.53
Type
journal article
Language
en
Update notices
erratum (2022-04-06)
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (R01MH52716, R01DA039062)
  • Natural Sciences and Engineering Council of Canada
  • Canadian Institutes of Health Research
  • CIHR
  • Alberta Innovates
  • BranchOut Neurological Foundation
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
Keywords
microglial phagocytosis, endocannabinoids, sex differences, social play, rough-and-tumble play, amygdala development, masculinization, androgens, astrocyte survival, neuronal excitation, social behavior, sexual differentiation of the brain
MeSH terms
Amygdala, Androgen Antagonists, Androgens, Animals, Animals, Newborn, Arachidonic Acids, Astrocytes, Behavior, Animal, Cell Survival, Complement System Proteins, Female, Flutamide, Glycerides, Male, Phagocytosis, Play and Playthings, Sex Characteristics, Social Behavior, Testosterone, Microglia, Rats, Polyunsaturated Alkamides, Endocannabinoids

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