Cited by 402Reproductive System and PregnancyTryptophan and brain disordersPreterm Birth and Chorioamnionitis

Activation of the maternal immune system induces endocrine changes in the placenta via IL-6

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Hsiao, Elaine Y., Patterson, Paul H.·2011·Brain, Behavior, and Immunity

Abstract

Activation of the maternal immune system in rodent models sets in motion a cascade of molecular pathways that ultimately result in autism- and schizophrenia-related behaviors in offspring. The finding that interleukin-6 (IL-6) is a crucial mediator of these effects led us to examine the mechanism by which this cytokine influences fetal development in vivo. Here we focus on the placenta as the site of direct interaction between mother and fetus and as a principal modulator of fetal development. We find that maternal immune activation (MIA) with a viral mimic, synthetic double-stranded RNA (poly(I:C)), increases IL-6 mRNA as well as maternally-derived IL-6 protein in the placenta. Placentas from MIA mothers exhibit increases in CD69+ decidual macrophages, granulocytes and uterine NK cells, indicating elevated early immune activation. Maternally-derived IL-6 mediates activation of the JAK/STAT3 pathway specifically in the spongiotrophoblast layer of the placenta, which results in expression of acute phase genes. Importantly, this parallels an IL-6-dependent disruption of the growth hormone-insulin-like growth factor (GH-IGF) axis that is characterized by decreased GH, IGFI and IGFBP3 levels. In addition, we observe an IL-6-dependent induction in pro-lactin-like protein-K (PLP-K) expression as well as MIA-related alterations in other placental endocrine factors. Together, these IL-6-mediated effects of MIA on the placenta represent an indirect mechanism by which MIA can alter fetal development.

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  • Maternal inflammation may play a role, given that maternal stress has been associated with increased inflammatory markers and altered cytokine production during pregnancy.

    “Moreover, maternal inflammation may play a role, given that maternal stress has been associated with increased inflammatory markers and altered cytokine production during pregnancy [136–139].”

    From Brain structural and functional outcomes in the offspring of women experiencing psychological distress during pregnancy (2024) · cites this paper as [139]

    The Discussion reports that experimentally induced maternal immune activation increases IL-6 and other pro-inflammatory cytokines during pregnancy, supporting a role for maternal inflammation. It does not establish the claimed association between maternal stress and increased inflammatory markers or altered cytokine production; the study's immune challenge is not maternal stress. (LLM, conf=0.82)

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Authors
Hsiao, E. Y., & Patterson, P. H.
Affiliations
California Institute of Technology (US)
Corresponding author
Hsiao, Elaine Y.
Venue
Brain, Behavior, and Immunity
Publisher
Elsevier BV
Published
2011-05
Volume
25
Issue
4
Pages
604-615
ISSN
0889-1591 (ISSN-L)
OpenAlex
W2165444002
Cited by
402
References
95
Citations by year
2026: 21 · 2025: 36 · 2024: 28 · 2023: 29 · 2022: 28 · 2021: 30 · 2020: 27 · 2019: 25 · 2018: 26 · 2017: 16 · 2016: 16 · 2015: 25 · 2014: 24 · 2013: 26 · 2012: 29
FWCI
9.65
Type
journal article
Language
en
Open access
Locations
  • Brain Behavior and Immunity (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
Funders
National Institutes of Health (NIH/NRSA 5 T32 GM07737)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Reproductive System and Pregnancy
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Health Sciences › Medicine › Epidemiology › Preterm Birth and Chorioamnionitis
Keywords
maternal immune activation, interleukin-6, placenta, poly(I:C), JAK/STAT3 signaling, spongiotrophoblast, decidual macrophages, uterine NK cells, growth hormone/insulin-like growth factor axis, IGFBP-3, placental endocrine function, autism spectrum disorder, schizophrenia, fetal development, cytokines
MeSH terms
Analysis of Variance, Animals, Behavior, Animal, Decidua, Female, Granulocytes, Killer Cells, Natural, Macrophages, Male, Mice, Inbred C57BL, Placenta, Poly I-C, Pregnancy, Pregnancy Proteins, Prenatal Exposure Delayed Effects, RNA, Double-Stranded, RNA, Messenger, Virus Diseases, Signal Transduction, Interleukin-6, Mice, Knockout, Maternal Exposure, Fetal Development, Mice, Endophenotypes

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