Deletion of psychiatric risk gene Cacna1c impairs hippocampal neurogenesis in cell-autonomous fashion

Ca2+ is a universal signal transducer which fulfills essential functions in cell development and differentiation. CACNA1C, the gene encoding the alpha-1C subunit (i.e., Cav1.2) of the voltage-dependent l-type calcium channel (LTCC), has been implicated as a risk gene in a variety of neuropsychiatric...

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Hauptverfasser: Völkening, Bianca (VerfasserIn) , Bartsch, Dusan (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: May 2017
In: Glia
Year: 2017, Jahrgang: 65, Heft: 5, Pages: 817-827
ISSN:1098-1136
DOI:10.1002/glia.23128
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1002/glia.23128
Verlag, Volltext: https://onlinelibrary-wiley-com.ezproxy.medma.uni-heidelberg.de/doi/abs/10.1002/glia.23128
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Verfasserangaben:Bianca Völkening, Kai Schönig, Golo Kronenberg, Dusan Bartsch, Tillmann Weber

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520 |a Ca2+ is a universal signal transducer which fulfills essential functions in cell development and differentiation. CACNA1C, the gene encoding the alpha-1C subunit (i.e., Cav1.2) of the voltage-dependent l-type calcium channel (LTCC), has been implicated as a risk gene in a variety of neuropsychiatric disorders. To parse the role of Cav1.2 channels located on astrocyte-like stem cells and their descendants in the development of new granule neurons, we created TgGLAST-CreERT2/Cacna1cfl/fl/RCE:loxP mice, a transgenic tool that allows cell-type-specific inducible deletion of Cacna1c. The EGFP reporter was used to trace the progeny of recombined type-1 cells. FACS-sorted Cacna1c-deficient neural precursor cells from the dentate gyrus showed reduced proliferative activity in neurosphere cultures. Moreover, under differentiation conditions, Cacna1c-deficient NPCs gave rise to fewer neurons and more astroglia. Similarly, under basal conditions in vivo, Cacna1c gene deletion in type-1 cells decreased type-1 cell proliferation and reduced the neuronal fate-choice decision of newly born cells, resulting in reduced net hippocampal neurogenesis. Unexpectedly, electroconvulsive seizures completely compensated for the proliferation deficit of Cacna1c deficient type-1 cells, indicating that there must be Cav1.2-independent mechanisms of controlling proliferation related to excitation. In the aggregate, this is the first report demonstrating the presence of functional L-type 1.2 channels on type-1 cells. Cav1.2 channels promote type-1 cell proliferation and push the glia-to-neuron ratio in the direction of a neuronal fate choice and subsequent neuronal differentiation. Cav1.2 channels expressed on NPCs and their progeny possess the ability to shape neurogenesis in a cell-autonomous fashion. 
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