Astrocytes impose postburst depression of release probability at hippocampal glutamate synapses.
Many neurons typically fire action potentials in brief, high-frequency bursts with specific consequences for their synaptic output. Here we have examined short-term plasticity engaged during burst activation using electrophysiological recordings in acute rat hippocampal slices. We show that CA3-CA1 glutamate synapses exhibit a prominent depression of presynaptic release probability for approximately 1 s after such a burst. This postburst depression exhibits a distinct cooperativity threshold, is abolished by inhibiting astrocyte metabolism and astrocyte calcium signaling, and is not operational in the developing hippocampus. Our results suggest that astrocytes are actively involved in short-term synaptic depression, shaping synaptic activity during behaviorally relevant neural activity.
Andersson
My
M
Institute of Neuroscience and Physiology, Gothenburg University, 405 30 Göteborg, Sweden. my.andersson@physiol.gu.se
Hanse
Eric
E
D000818:Animals; D001253:Astrocytes / Q000502:physiology*; D056547:CA1 Region, Hippocampal / Q000502:physiology*; D056654:CA3 Region, Hippocampal / Q000502:physiology*; D018698:Glutamic Acid / Q000502:physiology*; D006624:Hippocampus / Q000502:physiology; D036881:Long-Term Synaptic Depression / Q000502:physiology*; D009473:Neuronal Plasticity / Q000502:physiology; D011336:Probability; D051381:Rats; D017208:Rats, Wistar; D017470:Receptors, Glutamate / Q000502:physiology; D013569:Synapses / Q000502:physiology*
D017470:Receptors, Glutamate; D018698:Glutamic Acid
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