1 Ocak 2015 Dergi makalesi Açık Erişim

Lenkey, Nora; Kirizs, Tekla; Holderith, Noemi; Mate, Zoltan; Szabo, Gabor; Vizi, E. Sylvester; Hajos, Norbert; Nusser, Zoltan

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    <subfield code="a">The release of GABA from cholecystokinin-containing interneurons is modulated by type-1 cannabinoid receptors (CB1). Here we tested the hypothesis that the strength of CB1-mediated modulation of GABA release is related to the CB1 content of axon terminals. Basket cell boutons have on average 78% higher CB1 content than those of dendritic-layer-innervating (DLI) cells, a consequence of larger bouton surface and higher CB1 density. The CB1 antagonist AM251 caused a 54% increase in action potential-evoked [Ca2+] in boutons of basket cells, but not in DLI cells. However, the effect of AM251 did not correlate with CB1 immunoreactivity of individual boutons. Moreover, a CB1 agonist decreased [Ca2+] in a cell type-and CB1-content-independent manner. Replica immunogold labelling demonstrated the colocalization of CB1 with the Cav2.2 Ca2+ channel subunit. Our data suggest that only a subpopulation of CB(1)s, within nanometre distances from their target Cav2.2 channels, are responsible for endocannabinoid-mediated modulation of GABA release.</subfield>
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