Cited by 184Neuroscience and Neuropharmacology ResearchPharmacological Effects and Toxicity StudiesGenetics and Neurodevelopmental Disorders

Hyperconnectivity of Local Neocortical Microcircuitry Induced by Prenatal Exposure to Valproic Acid

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Rinaldi, T., Silberberg, G., Markram, H.·2008·Cerebral Cortex

Abstract

Exposure to valproic acid (VPA) during embryogenesis can cause several teratogenic effects, including developmental delays and in particular autism in humans if exposure occurs during the third week of gestation. We examined the postnatal effects of embryonic exposure to VPA on microcircuit properties of juvenile rat neocortex using in vitro electrophysiology. We found that a single prenatal injection of VPA on embryonic day 11.5 causes a significant enhancement of the local recurrent connectivity formed by neocortical pyramidal neurons. The study of the biophysical properties of these connections revealed weaker excitatory synaptic responses. A marked decrease of the intrinsic excitability of pyramidal neurons was also observed. Furthermore, we demonstrate a diminished number of putative synaptic contacts in connection between layer 5 pyramidal neurons. Local hyperconnectivity may render cortical modules more sensitive to stimulation and once activated, more autonomous, isolated, and more difficult to command. This could underlie some of the core symptoms observed in humans prenatally exposed to valproic acid.

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  • In prenatal VPA models, apical dendrite complexity but not length is increased on layer II pyramidal neurons in the motor cortex, decreased in the medial PFC, or unchanged in layer V pyramidal neurons of the somatosensory cortex.

    “In the case of apical dendrites, complexity, but not length, is increased on layer II pyramidal neurons in the motor cortex [331], decreased in the medial PFC [297], or is unchanged in layer V pyramidal neurons of the somatosensory cortex following VPA exposure in rodents [301].”

    From Autism spectrum disorder: neuropathology and animal models (2017) · cites this paper as [301]

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Authors
Rinaldi, T., Silberberg, G., & Markram, H.
Affiliations
  • Karolinska Institutet (SE)
  • École Polytechnique Fédérale de Lausanne (CH)
Venue
Cerebral Cortex
Published
2007-07-17
Volume
18
Issue
4
Pages
763-770
ISSN
  • 1047-3211 (ISSN-L)
  • 1460-2199
OpenAlex
W2148788336
Cited by
184
References
31
Citations by year
2026: 3 · 2025: 4 · 2024: 8 · 2023: 5 · 2022: 13 · 2021: 7 · 2020: 8 · 2019: 7 · 2018: 7 · 2017: 7 · 2016: 16 · 2015: 20 · 2014: 10 · 2013: 17 · 2012: 7
FWCI
3.45
Type
journal article
Language
en
Open access
Locations
  • Cerebral Cortex (publishedVersion)
  • PubMed (publishedVersion)
  • reroDoc Digital Library (submittedVersion)
  • Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion)
  • Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion, cc-by-nc-nd)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Pharmacological Effects and Toxicity Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
Keywords
valproic acid, prenatal drug exposure, teratogenicity, autism spectrum disorder, recurrent connectivity, pyramidal neurons, intrinsic excitability, synaptic transmission, layer 5 pyramidal neurons
MeSH terms
Animals, Anticonvulsants, Autistic Disorder, Cell Count, Disease Models, Animal, Female, Male, Neural Pathways, Organ Culture Techniques, Pregnancy, Prenatal Exposure Delayed Effects, Valproic Acid, Rats, Wistar, Pyramidal Cells, Patch-Clamp Techniques, Neocortex, Rats

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