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A series of recent clinical studies in humans reported that VPA exposure<jats:italic>in utero<\/jats:italic>impaired histogenesis and the development of the central nervous system, leading to increased risks of congenital malformation and the impairment of higher brain functions in children. In the present study conducted in mice, we report that VPA exposure<jats:italic>in utero<\/jats:italic>(1) increases the amount of acetylated histone proteins, (2) alters the expression of G1-phase regulatory proteins, (3) inhibits the cell cycle exit of neural progenitor cells during the early stage of neocortical histogenesis, and (4) increases the production of projection neurons distributed in the superficial neocortical layers in embryonic brains. Together, our findings show that VPA exposure<jats:italic>in utero<\/jats:italic>alters proliferation\/differentiation characteristics of neural progenitor cells and hence leads to the neocortical dysgenesis.<\/jats:p><jats:p><jats:bold>SIGNIFICANCE STATEMENT<\/jats:bold>This study provides new insight into the mechanisms of how an altered<jats:italic>in utero<\/jats:italic>environment, such as drug exposure, affects the generation of neurons prenatally. The antiepileptic drug valproic acid (VPA) is a good target molecule as<jats:italic>in utero<\/jats:italic>exposure to VPA has been repeatedly reported to increase the risk of nervous system malformations and to impair higher brain functions in children. We show that VPA decreases the probability of differentiation of the neural progenitor cells (NPCs) in mice, resulting in an abnormally increased number of projection neurons in the superficial layers of the neocortex. Further, we suggest that histone deacetylase inhibition by VPA may be involved in the dysregulation of proliferation\/differentiation characteristics of NPCs.<\/jats:p>","DOI":"10.1523\/jneurosci.0229-16.2016","type":"journal-article","created":{"date-parts":[[2016,10,19]],"date-time":"2016-10-19T15:22:25Z","timestamp":1476890545000},"page":"10908-10919","source":"Crossref","is-referenced-by-count":56,"title":["<i>In Utero<\/i>Exposure to Valproic Acid Induces Neocortical Dysgenesis via Dysregulation of Neural Progenitor Cell 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