Cited by 91Neuroinflammation and Neurodegeneration MechanismsGut microbiota and healthNeurogenesis and neuroplasticity mechanisms

The microbiota influences cell death and microglial colonization in the perinatal mouse brain

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Castillo-Ruiz, Alexandra, Mosley, Morgan, George, Arlene J., Mussaji, Lamiyah F., Fullerton, Evan F., Ruszkowski, Elara M., Jacobs, Andrew J., Gewirtz, Andrew T. +2 more·2018·Brain, Behavior, and Immunity

Abstract

The mammalian fetus develops in a largely sterile environment, and direct exposure to a complex microbiota does not occur until birth. We took advantage of this to examine the effect of the microbiota on brain development during the first few days of life. The expression of anti- and pro-inflammatory cytokines, developmental cell death, and microglial colonization in the brain were compared between newborn conventionally colonized mice and mice born in sterile, germ-free (GF) conditions. Expression of the pro-inflammatory cytokines interleukin 1β and tumor necrosis factor α was markedly suppressed in GF newborns. GF mice also had altered cell death, with some regions exhibiting higher rates (paraventricular nucleus of the hypothalamus and the CA1 oriens layer of the hippocampus) and other regions exhibiting no change or lower rates (arcuate nucleus of the hypothalamus) of cell death. Microglial labeling was elevated in GF mice, due to an increase in both microglial cell size and number. The changes in cytokine expression, cell death and microglial labeling were evident on the day of birth, but were absent on embryonic day 18.5, approximately one-half day prior to expected delivery. Taken together, our results suggest that direct exposure to the microbiota at birth influences key neurodevelopmental events and does so within hours. These findings may help to explain some of the behavioral and neurochemical alterations previously seen in adult GF mice.

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Crossref · 10.1016/j.bbi.2017.08.027

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  • Altered microglial morphology and density, as well as attenuated inflammatory responses, are observed in offspring of GF dams immediately after birth.

    “Altered microglial morphology and density, as well as attenuated inflammatory responses, are also observed in offspring of GF dams immediately after birth, a time when microglia typically exhibit an activated phenotype (Castillo-Ruiz et al., 2018).”

    From Microbiome–microglia connections via the gut–brain axis (2019) · cites this paper as Castillo-Ruiz et al., 2018

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Authors
Castillo-Ruiz, A., Mosley, M., George, A. J., Mussaji, L. F., Fullerton, E. F., Ruszkowski, E. M., Jacobs, A. J., Gewirtz, A. T., Chassaing, B., & Forger, N. G.
Affiliations
Georgia State University (US)
Venue
Brain, Behavior, and Immunity
Publisher
Elsevier BV
Published
2018-01
Volume
67
Pages
218-229
ISSN
0889-1591 (ISSN-L)
OpenAlex
W2753781001
Cited by
91
References
90
Citations by year
2026: 7 · 2025: 15 · 2024: 10 · 2023: 9 · 2022: 13 · 2021: 12 · 2020: 8 · 2019: 6 · 2018: 10 · 2017: 1
FWCI
3.41
Type
journal article
Language
en
Open access
Locations
  • Brain Behavior and Immunity (acceptedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Science Foundation (IOS-1743673)
  • National Institutes of Health (R21-MH108345)
  • Crohn’s and Colitis Foundation of America (CCFA)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
Keywords
gut microbiota, germ-free mice, neonatal brain development, developmental cell death, inflammatory cytokines, IL-1β, TNF-α, hypothalamus, hippocampus, perinatal period, neuroinflammation
MeSH terms
Animals, Brain, Encephalitis, Female, Male, Neurons, Pregnancy, Cell Death, Microglia, Inflammation Mediators, Mice, Microbiota

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