Cited by 275Tryptophan and brain disordersNeuroinflammation and Neurodegeneration MechanismsReproductive System and Pregnancy

The placental interleukin-6 signaling controls fetal brain development and behavior

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Wu, Wei-Li, Hsiao, Elaine Y., Yan, Zihao, Mazmanian, Sarkis K., Patterson, Paul H.·2017·Brain Behavior and Immunity

Abstract

Epidemiological studies show that maternal immune activation (MIA) during pregnancy is a risk factor for autism. However, mechanisms for how MIA affects brain development and behaviors in offspring remain poorly described. To determine whether placental interleukin-6 (IL-6) signaling is required for mediating MIA on the offspring, we generated mice with restricted deletion of the receptor for IL-6 (IL-6Rα) in placental trophoblasts (Cyp19-Cre+;Il6ra fl/fl), and tested offspring of Cyp19-Cre+;Il6ra fl/fl mothers for immunological, pathological and behavioral abnormalities following induction of MIA. We reveal that MIA results in acute inflammatory responses in the fetal brain. Lack of IL-6 signaling in trophoblasts effectively blocks MIA-induced inflammatory responses in the placenta and the fetal brain. Furthermore, behavioral abnormalities and cerebellar neuropathologies observed in MIA control offspring are prevented in Cyp19-Cre+;Il6ra fl/fl offspring. Our results demonstrate that IL-6 activation in placenta is required for relaying inflammatory signals to the fetal brain and impacting behaviors and neuropathologies relevant to neurodevelopmental disease.

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  • Increased levels of IL-6 alone recapitulate aspects of ASD pathophysiology.

    “Importantly, increased levels of IL-6 alone recapitulate aspects of ASD pathophysiology [138, 142, 143].”
  • Placental interleukin-6 mediates the maternal infection-induced ASD risk to the developing fetus.

    “Placental interleukin-6 (IL-6), a pro-inflammatory cytokine, was shown to mediate the maternal infection-induced ASD risk to the developing fetus.”

    From Gastrointestinal Issues and Autism Spectrum Disorder (2020) · cites this paper as [71]

  • Progeny of MIA mice develop phenotypes consistent with ASD, whereas mice with selective deletion of IL-6 in placental trophoblasts had offspring that did not display these neurobiological or behavioral abnormalities.

    “Whereas progeny of MIA mice develop phenotypes consistent with ASD, those mice with selective deletion of IL-6 in placental trophoblasts had offspring that did not display these neurobiological or behavioral abnormalities 71.”

    From Gastrointestinal Issues and Autism Spectrum Disorder (2020) · cites this paper as [71]

  • Mouse studies have shown evidence that the link between maternal inflammation and ASD development may involve placental inflammation.

    “Mouse studies have shown evidence that the link between maternal inflammation and ASD development may involve placental inflammation.”

    From Gastrointestinal Issues and Autism Spectrum Disorder (2020) · cites this paper as [71]

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Authors
Wu, W.-L., Hsiao, E. Y., Yan, Z., Mazmanian, S. K., & Patterson, P. H.
Affiliations
California Institute of Technology (US)
Corresponding author
Wu, Wei-Li
Venue
Brain Behavior and Immunity
Publisher
Elsevier BV
Published
2017-05
Volume
62
Pages
11-23
ISSN
0889-1591 (ISSN-L)
OpenAlex
W2553830639
Cited by
275
References
76
Citations by year
2026: 24 · 2025: 30 · 2024: 32 · 2023: 30 · 2022: 33 · 2021: 38 · 2020: 26 · 2019: 32 · 2018: 19 · 2017: 10 · 2016: 1
FWCI
6.87
Type
journal article
Language
en
Open access
Locations
  • Brain Behavior and Immunity (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
Funders
NIH (5P50MH086383-04)
Topics
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Immunology and Microbiology › Immunology › Reproductive System and Pregnancy
Keywords
maternal immune activation, interleukin-6, IL-6 receptor alpha, placenta, trophoblast, fetal brain development, autism risk, neuroinflammation, offspring behavior, neurodevelopmental disorders
MeSH terms
Animals, Behavior, Animal, Brain, Female, Placenta, Pregnancy, Signal Transduction, Interleukin-6, Mice, Knockout, Receptors, Interleukin-6, Fetal Development, Mice

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