Astrocytes potentiate transmitter release at single hippocampal synapses

Gertrudis Perea, Alfonso Araque

Research output: Contribution to journalArticlepeer-review

553 Scopus citations


Astrocytes play active roles in brain physiology. They respond to neurotransmitters and modulate neuronal excitability and synaptic function. However, the influence of astrocytes on synaptic transmission and plasticity at the single synapse level is unknown. Ca2+ elevation in astrocytes transiently increased the probability of transmitter release at hippocampal area CA3-CA1 synapses, without affecting the amplitude of synaptic events. This form of short-term plasticity was due to the release of glutamate from astrocytes, a process that depended on Ca2+ and soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) protein and that activated metabotropic glutamate receptors (mGluRs). The transient potentiation of transmitter release became persistent when the astrocytic signal was temporally coincident with postsynaptic depolarization. This persistent plasticity was mGluR-mediated but N-methyl-D-aspartate receptor-independent. These results indicate that astrocytes are actively involved in the transfer and storage of synaptic information.

Original languageEnglish (US)
Pages (from-to)1083-1086
Number of pages4
Issue number5841
StatePublished - Aug 24 2007


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