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Título

Endocannabinoids induce lateral long-term potentiation of transmitter release by stimulation of gliotransmission

AutorGómez-Gonzalo, Marta; Navarrete, Marta; Perea, Gertrudis ; Covelo, Ana; Martín-Fernández, Mario; Shigemoto, Ryuichi; Luján, Rafael; Araque, Alfonso
Palabras claveEndocannabinoid signaling
Astrocytes
mGluRs
Nitric oxide
LTP
Fecha de publicación2015
EditorOxford University Press
CitaciónCerebral Cortex 25: 3699- 3712 (2015)
ResumenEndocannabinoids (eCBs) play key roles in brain function, acting as modulatory signals in synaptic transmission and plasticity. They are recognized as retrograde messengers that mediate long-term synaptic depression (LTD), but their ability to induce long-term potentiation (LTP) is poorly known. We show that eCBs induce the long-term enhancement of transmitter release at single hippocampal synapses through stimulation of astrocytes when coincident with postsynaptic activity. This LTP requires the coordinated activity of the 3 elements of the tripartite synapse: 1) eCB-evoked astrocyte calcium signal that stimulates glutamate release; 2) postsynaptic nitric oxide production; and 3) activation of protein kinase C and presynaptic group I metabotropic glutamate receptors, whose location at presynaptic sites was confirmed by immunoelectron microscopy. Hence, while eCBs act as retrograde signals to depress homoneuronal synapses, they serve as lateral messengers to induce LTP in distant heteroneuronal synapses through stimulation of astrocytes. Therefore, eCBs can trigger LTP through stimulation of astrocyte-neuron signaling, revealing novel cellular mechanisms of eCB effects on synaptic plasticity.
URIhttp://hdl.handle.net/10261/133875
DOI10.1093/cercor/bhu231
Identificadoresdoi: 10.1093/cercor/bhu231
issn: 1460-2199
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