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Polarized distribution of AMPA, but not GABAA, receptors in radial glia-like cells of the adult dentate gyrus

Renzel, Roland, Sadek, Ahmed-Ramadan, Chang, Cin-He, Gray, William Peter, Seifert, Gerald and Steinhäuser, Christian 2013. Polarized distribution of AMPA, but not GABAA, receptors in radial glia-like cells of the adult dentate gyrus. Glia 61 (7) , pp. 1146-1154. 10.1002/glia.22505

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Abstract

Glial fibrillary acidic protein (GFAP)-positive astrocytes with radial processes [radial glia (RG)-like cells] in the postnatal dentate gyrus share many of the characteristics of embryonic radial glia and appear to act as precursor cells for adult dentate neurogenesis, a process important for pattern separation and hippocampus-dependent learning. Although much work has delineated the mechanisms underlying activity-neurogenesis coupling via gamma-amino butyric acid (GABA)ergic neurotransmission on GFAP-negative transient-amplifying cells and neuroblasts, little is known regarding the effects of neurotransmitters on RG-like cells. Conflicting evidence exists for both GABA and glutamate receptors on these cells. Here, using GFAP reporter mice, we show that the somatic membrane of RG-like cells carries GABAA receptors and glutamate transporters but not ionotropic glutamate receptors, whereas 2-amino-3-(hydroxyl-5-methylisoxazole-4-yl) propionic acid (AMPA) and GABAA receptors are expressed on the processes of these cells. Almost all RG-like cells expressed the GluA2 subunit, which restricts the Ca2+ permeability of AMPA receptors. The glial GABAA receptors mainly comprised α2/α4, β1, and γ1/γ3. The selective presence of AMPA receptors on the radial processes may be important for sensing and responding to local activity-driven glutamate release and supports the concept that RG-like astrocytes are composed of functional and structural domains.

Item Type: Article
Date Type: Publication
Status: Published
Schools: MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG)
Medicine
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Uncontrolled Keywords: RG-like cell; AMPA receptor; GABAA receptor; dentate gyrus; adult neurogenesis
Publisher: Wiley
ISSN: 0894-1491
Last Modified: 04 Jun 2017 06:30
URI: http://orca.cf.ac.uk/id/eprint/61243

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