Prenatal Valproic Acid Exposure Impairs Offspring Cognition Through Disturbing Interneuron Development

TL;DR

Prenatal exposure to valproic acid (VPA) harms offspring cognitive development by disrupting the formation of brain interneurons, particularly those producing somatostatin.

Contribution

The study reveals that VPA's impact on cognition is subtype-specific, primarily affecting somatostatin-positive interneurons during neurogenesis.

Findings

Prenatal VPA exposure caused anxiety and memory impairment in male offspring.

VPA disrupted cortical interneuron distribution and affected somatostatin-positive neurons but not parvalbumin-positive ones.

RNA-Seq showed altered ion homeostasis processes following VPA exposure.

Abstract

Valproic acid (VPA) exposure during the gestational period has been found to impair the cognition of the offspring. The study aimed to investigate whether VPA leads to offspring cognitive impairment through disturbing interneuron development.

Pregnant mice were injected with VPA peritoneally to establish the prenatal VPA exposure model. Cortical interneurons were labeled with Rosa26‐EYFP/− reporter mice activated by Nkx2.1‐Cre. Interneuron subtypes both in the cortex and the hippocampus were detected by immunofluorescence. A battery of behavioral tests was conducted on postnatal Day 28 to assess the cognition and anxiety of the offspring. RNA‐Seq analysis was performed to investigate the underlying molecular mechanisms.

We found that after the exposure to VPA, all the groups of the male offspring exerted anxiety. When VPA injection was performed on gestational Day 12.5, the memory of the offspring was impaired. Mechanistically, the distribution of cortical interneurons was disrupted. The distribution of interneuron subtypes was abnormal both in the cortex and hippocampus after the VPA exposure, which affected the somatostatin‐positive neurons but not the parvalbumin‐positive neurons, indicating the effects of VPA were subtype specific. Biological processes related to ion homeostasis were greatly changed after VPA exposure.

Prenatal VPA exposure during the neurogenic period impaired the cognition of the offspring by disrupting interneuron migration and differentiation. The study provides a novel perspective on the influence of VPA over neurodevelopment.

Prenatal VPA exposure during the neurogenic period impaired the cognition of the offspring by disrupting interneuron migration and differentiation. The influence of VPA was found to be subtype‐specific, predominantly affecting the somatostatin‐positive neurons.

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