Localization of the cannabinoid type-1 receptor in subcellular astrocyte compartments of mutant mouse hippocampus

Glia
Ana Gutiérrez-RodríguezPedro Grandes

Abstract

Astroglial type-1 cannabinoid (CB1 ) receptors are involved in synaptic transmission, plasticity and behavior by interfering with the so-called tripartite synapse formed by pre- and post-synaptic neuronal elements and surrounding astrocyte processes. However, little is known concerning the subcellular distribution of astroglial CB1 receptors. In particular, brain CB1 receptors are mostly localized at cells' plasmalemma, but recent evidence indicates their functional presence in mitochondrial membranes. Whether CB1 receptors are present in astroglial mitochondria has remained unknown. To investigate this issue, we included conditional knock-out mice lacking astroglial CB1 receptor expression specifically in glial fibrillary acidic protein (GFAP)-containing astrocytes (GFAP-CB1 -KO mice) and also generated genetic rescue mice to re-express CB1 receptors exclusively in astrocytes (GFAP-CB1 -RS). To better identify astroglial structures by immunoelectron microscopy, global CB1 knock-out (CB1 -KO) mice and wild-type (CB1 -WT) littermates were intra-hippocampally injected with an adeno-associated virus expressing humanized renilla green fluorescent protein (hrGFP) under the control of human GFAP promoter to generate GFAPhrGFP-CB1 -KO...Continue Reading

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