Cited by 92Prenatal Substance Exposure EffectsNeurogenesis and neuroplasticity mechanismsNeuroscience and Neuropharmacology Research

Persistent Interneuronopathy in the Prefrontal Cortex of Young Adult Offspring Exposed to Ethanol In Utero

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Skorput, A. G. J., Gupta, V. P., Yeh, P. W. L., Yeh, H. H.·2015·Journal of Neuroscience

Abstract

Gestational exposure to ethanol has been reported to alter the disposition of tangentially migrating GABAergic cortical interneurons, but much remains to be elucidated. Here we first established the migration of interneurons as a proximal target of ethanol by limiting ethanol exposure in utero to the gestational window when tangential migration is at its height. We then asked whether the aberrant tangential migration of GABAergic interneurons persisted as an enduring interneuronopathy in the medial prefrontal cortex (mPFC) later in the life of offspring prenatally exposed to ethanol. Time pregnant mice with Nkx2.1Cre/Ai14 embryos harboring tdTomato-fluorescent medial ganglionic eminence (MGE)-derived cortical GABAergic interneurons were subjected to a 3 day binge-type 5% w/w ethanol consumption regimen from embryonic day (E) 13.5-16.5, spanning the peak of corticopetal interneuron migration in the fetal brain. Our binge-type regimen increased the density of MGE-derived interneurons in the E16.5 mPFC. In young adult offspring exposed to ethanol in utero, this effect persisted as an increase in the number of mPFC layer V parvalbumin-immunopositive interneurons. Commensurately, patch-clamp recording in mPFC layer V pyramidal neurons uncovered enhanced GABA-mediated spontaneous and evoked synaptic transmission, shifting the inhibitory/excitatory balance toward favoring inhibition. Furthermore, young adult offspring exposed to the 3 day binge-type ethanol regimen exhibited impaired reversal learning in a modified Barnes maze, indicative of decreased PFC-dependent behavioral flexibility, and heightened locomotor activity in an open field arena. Our findings underscore that aberrant neuronal migration, inhibitory/excitatory imbalance, and thus interneuronopathy contribute to indelible abnormal cortical circuit form and function in fetal alcohol spectrum disorders. SIGNIFICANCE STATEMENT: The significance of this study is twofold. First, we demonstrate that a time-delimited binge-type ethanol exposure in utero during early gestation alters corticopetal tangential migration of GABAergic interneurons in the fetal brain. Second, our study is the first to integrate neuroanatomical, electrophysiological, and behavioral evidence that this "interneuronopathy" persists in the young adult offspring and contributes to enduring changes in (1) the distribution of parvalbumin-expressing GABAergic cortical interneurons in the medial prefrontal cortex, (2) GABA-mediated synaptic transmission that resulted in an inhibitory/excitatory synaptic imbalance, and (3) behavioral flexibility. These findings alert women of child-bearing age that fetal alcohol spectrum disorders can be rooted very early in fetal brain development, and reinforce evidence-based counseling against binge drinking even at the earliest stages of pregnancy.

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Crossref · 10.1523/jneurosci.1462-15.2015

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  • Structurally, the prefrontal cortical thickness is affected after prenatal alcohol exposure and it matures with a smaller number of excitatory neurons and more GABAergic ones, disrupting the excitatory/inhibitory balance severely.

    “Structurally, the prefrontal cortical thickness is affected after prenatal alcohol exposure and it matures with a smaller number of excitatory neurons and more GABAergic ones disrupting the excitatory/inhibitory balance severely [319–321].”

    From Development of prefrontal cortex (2022) · cites this paper as [319]

    The Results section on GABAergic interneurons reports more PV-positive interneurons in the medial prefrontal cortex of young adult mice exposed to ethanol in utero. The section on inhibitory/excitatory imbalance reports enhanced inhibitory synaptic drive onto layer V pyramidal neurons. The passages do not establish altered prefrontal cortical thickness or a smaller number of excitatory neurons; those parts of the citing sentence are unsupported by this paper. (LLM, conf=0.88)

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Authors
Skorput, A. G. J., Gupta, V. P., Yeh, P. W. L., & Yeh, H. H.
Affiliations
Dartmouth–Hitchcock Medical Center (US)
Venue
Journal of Neuroscience
Published
2015-08-05
Volume
35
Issue
31
Pages
10977-10988
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W1727961109
Cited by
92
References
72
Citations by year
2026: 5 · 2025: 5 · 2024: 9 · 2023: 6 · 2022: 7 · 2021: 14 · 2020: 12 · 2019: 11 · 2018: 5 · 2017: 12 · 2016: 6
FWCI
7.64
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute on Alcohol Abuse and Alcoholism (R21AA024036, R01AA023410)
  • National Institute of Mental Health (R01MH069826)
Topics
  • Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Prenatal Substance Exposure Effects
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
prenatal alcohol exposure, fetal alcohol spectrum disorders, GABAergic interneurons, medial prefrontal cortex, parvalbumin interneurons, excitation-inhibition balance, GABAergic neurotransmission, reversal learning, behavioral flexibility, locomotor activity, binge ethanol exposure, medial ganglionic eminence
MeSH terms
Ethanol, Animals, Female, Interneurons, Parvalbumins, Pregnancy, Prenatal Exposure Delayed Effects, Prefrontal Cortex, Mice, GABAergic Neurons

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