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Cereb Cortex. 2015 Sep;25(9):2395-408. doi: 10.1093/cercor/bhu039. Epub 2014 Mar 7.

CB1 Cannabinoid Receptor-Dependent Activation of mTORC1/Pax6 Signaling Drives Tbr2 Expression and Basal Progenitor Expansion in the Developing Mouse Cortex.

Author information

1
Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED), Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Instituto Universitario de Investigaciones Neuroquímicas (IUIN), Department of Biochemistry and Molecular Biology I, Complutense University, Madrid 28040, Spain.

Abstract

The CB1 cannabinoid receptor regulates cortical progenitor proliferation during embryonic development, but the molecular mechanism of this action remains unknown. Here, we report that CB1-deficient mouse embryos show premature cell cycle exit, decreased Pax6- and Tbr2-positive cell number, and reduced mammalian target of rapamycin complex 1 (mTORC1) activation in the ventricular and subventricular cortical zones. Pharmacological stimulation of the CB1 receptor in cortical slices and progenitor cell cultures activated the mTORC1 pathway and increased the number of Pax6- and Tbr2-expressing cells. Likewise, acute CB1 knockdown in utero reduced mTORC1 activation and cannabinoid-induced Tbr2-positive cell generation. Luciferase reporter and chromatin immunoprecipitation assays revealed that the CB1 receptor drives Tbr2 expression downstream of Pax6 induction in an mTORC1-dependent manner. Altogether, our results demonstrate that the CB1 receptor tunes dorsal telencephalic progenitor proliferation by sustaining the transcriptional activity of the Pax6-Tbr2 axis via the mTORC1 pathway, and suggest that alterations of CB1 receptor signaling, by producing the missexpression of progenitor identity determinants may contribute to neurodevelopmental alterations.

KEYWORDS:

Eomes; basal progenitors; cannabinoid; corticogenesis; mTORC1

PMID:
24610119
DOI:
10.1093/cercor/bhu039
[Indexed for MEDLINE]

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