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The Neuropsychiatric Disease-Associated Gene cacna1c Mediates Survival of Young Hippocampal Neurons.

TitleThe Neuropsychiatric Disease-Associated Gene cacna1c Mediates Survival of Young Hippocampal Neurons.
Publication TypeJournal Article
Year of Publication2016
AuthorsLee AS, De Jesús-Cortés H, Kabir ZD, Knobbe W, Orr M, Burgdorf C, Huntington P, McDaniel L, Britt JK, Hoffmann F, Brat DJ, Rajadhyaksha AM, Pieper AA
JournaleNeuro
Volume3
Issue2
Date Published2016 Mar-Apr
ISSN2373-2822
KeywordsAnimals, Animals, Newborn, Brain-Derived Neurotrophic Factor, Bromodeoxyuridine, Calcium Channels, L-Type, Calcium-Calmodulin-Dependent Protein Kinase Type 2, Carbazoles, Cell Survival, Corticosterone, Disease Models, Animal, Hippocampus, Male, Mice, Mice, Inbred C57BL, Mice, Knockout, Mutation, Neurogenesis, Neurons, Neuroprotective Agents, Prosencephalon, Stress, Psychological
Abstract

Genetic variations in CACNA1C, which encodes the Cav1.2 subunit of L-type calcium channels (LTCCs), are associated with multiple forms of neuropsychiatric disease that manifest high anxiety in patients. In parallel, mice harboring forebrain-specific conditional knockout of cacna1c (forebrain-Cav1.2 cKO) display unusually high anxiety-like behavior. LTCCs in general, including the Cav1.3 subunit, have been shown to mediate differentiation of neural precursor cells (NPCs). However, it has not previously been determined whether Cav1.2 affects postnatal hippocampal neurogenesis in vivo. Here, we show that forebrain-Cav1.2 cKO mice exhibit enhanced cell death of young hippocampal neurons, with no change in NPC proliferation, hippocampal size, dentate gyrus thickness, or corticosterone levels compared with wild-type littermates. These mice also exhibit deficits in brain levels of brain-derived neurotrophic factor (BDNF), and Cre recombinase-mediated knockdown of adult hippocampal Cav1.2 recapitulates the deficit in young hippocampal neurons survival. Treatment of forebrain-Cav1.2 cKO mice with the neuroprotective agent P7C3-A20 restored the net magnitude of postnatal hippocampal neurogenesis to wild-type levels without ameliorating their deficit in BDNF expression. The role of Cav1.2 in young hippocampal neurons survival may provide new approaches for understanding and treating neuropsychiatric disease associated with aberrations in CACNA1C. Visual Abstract.

DOI10.1523/ENEURO.0006-16.2016
Alternate JournaleNeuro
PubMed ID27066530
PubMed Central IDPMC4819284