Cited by 158Autism Spectrum Disorder ResearchSexual Differentiation and DisordersGenetics and Neurodevelopmental Disorders

Convergence of Sex Differences and the Neuroimmune System in Autism Spectrum Disorder

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McCarthy, Margaret M., Wright, Christopher L.·2017·Biological Psychiatry

Abstract

The male bias in autism spectrum disorder incidence is among the most extreme of all neuropsychiatric disorders, yet the origins of the sex difference remain obscure. Developmentally, males are exposed to high levels of testosterone and its byproduct, estradiol. Together these steroids modify the course of brain development by altering neurogenesis, cell death, migration, differentiation, dendritic and axonal growth, synaptogenesis, and synaptic pruning, all of which can be deleteriously impacted during the course of developmental neuropsychiatric disorders. Elucidating the cellular mechanisms by which steroids modulate brain development provides valuable insights into how these processes may go awry. An emerging theme is the role of inflammatory signaling molecules and the innate immune system in directing brain masculinization, the evidence for which we review here. Evidence is also emerging that the neuroimmune system is overactivated in individuals with autism spectrum disorder. These combined observations lead us to propose that the natural process of brain masculinization puts males at risk by moving them closer to a vulnerability threshold that could more easily be breached by inflammation during critical periods of brain development. Two brain regions are highlighted: the preoptic area and the cerebellum. Both are developmentally regulated by the inflammatory prostaglandin E2, but in different ways. Microglia, innate immune cells of the brain, and astrocytes are also critical contributors to masculinization and illustrate the importance of nonneuronal cells to the health of the developing brain.

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Crossref · 10.1016/j.biopsych.2016.10.004

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  • Disrupted prostaglandin signalling during a critical period of cerebellar development is associated with deficits in play behaviour in male rodents.

    “For example, disrupted prostaglandin signalling during a critical period of cerebellar development is associated with deficits in play behaviour in male rodents269.”

    From Sex and gender in neurodevelopmental conditions (2023) · cites this paper as [269]

  • In animal models, immune-related signalling and cellular actions are implicated in brain masculinization, sex-specific synaptic patterning and social behaviours.

    “In animal models, immune-related signalling and cellular actions are implicated in brain masculinization, sex-specific synaptic patterning and social behaviours of the animals269,270.”

    From Sex and gender in neurodevelopmental conditions (2023) · cites this paper as [269]

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Authors
McCarthy, M. M., & Wright, C. L.
Affiliations
University of Maryland, Baltimore (US)
Corresponding author
McCarthy, Margaret M.
Venue
Biological Psychiatry
Publisher
Elsevier BV
Published
2017-03
Volume
81
Issue
5
Pages
402-410
ISSN
0006-3223 (ISSN-L)
OpenAlex
W2531611143
Cited by
158
References
115
Citations by year
2026: 10 · 2025: 17 · 2024: 10 · 2023: 14 · 2022: 22 · 2021: 19 · 2020: 19 · 2019: 13 · 2018: 21 · 2017: 13
FWCI
1.65
Type
journal article
Language
en
Open access
Locations
  • Biological Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute of Mental Health (R01MH091424, R01MH052716)
  • National Institute on Drug Abuse (R01DA039062)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Sexual Differentiation and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
Keywords
autism spectrum disorder, sex differences, neuroimmune system, brain masculinization, testosterone, estradiol, neuroinflammation, innate immune system, prostaglandin E2, preoptic area, cerebellum, microglia, astrocytes, brain development, synaptic pruning, synaptogenesis
MeSH terms
Autism Spectrum Disorder, Animals, Astrocytes, Behavior, Animal, Brain, Cerebellum, Disease Models, Animal, Female, Humans, Immunity, Innate, Inflammation, Male, Preoptic Area, Risk Factors, Sex Characteristics, Sex Differentiation, Sex Factors, Neuroimmunomodulation, Dinoprostone, Microglia, Mice, Rats

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