Astroglial adrenoreceptors modulate synaptic transmission and contextual fear memory formation in dentate gyrus.
Neurochem Int
; 143: 104942, 2021 02.
Article
en En
| MEDLINE
| ID: mdl-33340594
Astrocytes perform various supporting functions, including ion buffering, metabolic supplying and neurotransmitter clearance. They can also sense neuronal activity owing to the presence of specific receptors for neurotransmitters. In turn, astrocytes can regulate synaptic activity through the release of gliotransmitters. Evidence has shown that astrocytes are very sensitive to the locus coeruleus (LC) afferents. However, little is known about how LC neuromodulatory norepinephrine (NE) modulates synaptic transmission through astrocytic activity. In mouse dentate gyrus (DG), we demonstrated an increase in the frequency of miniature excitatory postsynaptic currents (mEPSC) in response to NE, which required the release of glutamate from astrocytes. The rise in glutamate release probability is likely due to the activation of presynaptic GluN2B-containing NMDA receptors. Moreover, we showed that the activation of NE signaling in DG is necessary for the formation of contextual learning memory. Thus, NE signaling activation during fear conditioning training contributed to enduring changes in the frequency of mEPSC in DG. Our results strongly support the physiological neuromodulatory role of NE signaling, which is derived from activation of astrocytes.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Astrocitos
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Receptores de N-Metil-D-Aspartato
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Transmisión Sináptica
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Giro Dentado
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Miedo
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Memoria
Límite:
Animals
Idioma:
En
Revista:
Neurochem Int
Año:
2021
Tipo del documento:
Article
Pais de publicación:
Reino Unido