Role of Glutamate Autoreceptors at Hippocampal Mossy Fiber Synapses

Hyung Bae Kwon, Pablo E. Castillo

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Presynaptic autoreceptors modulate transmitter release at many synapses. At the mossy fiber to CA3 pyramidal cell (mf-CA3) synapse, two types of glutamatergic autoreceptors have been identified: transmitter release is reportedly suppressed by metabotropic glutamate receptors (mGluRs) and augmented by kainate receptors (KARs). However, the net effect of these autoreceptors when activated by endogenous glutamate is unknown. Here, we show that during low-frequency mossy fiber stimulation, glutamate acting through presynaptic mGluRs substantially suppresses transmitter release. However, using similar recording conditions, we find that presynaptic KARs are insufficient to facilitate transmitter release over a wide range of mossy fiber stimulus frequencies, indicating that the uniquely robust mf-CA3 short-term plasticity is KAR independent. Furthermore, we report that actions generally attributed to presynaptic KARs are likely due to activation of recurrent CA3 network activity. Thus, negative feedback via presynaptic mGluRs is the dominant mode of glutamatergic autoregulation at the mf-CA3 synapse.

Original languageEnglish (US)
Pages (from-to)1082-1094
Number of pages13
JournalNeuron
Volume60
Issue number6
DOIs
StatePublished - Dec 26 2008

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Hippocampal Mossy Fibers
Kainic Acid Receptors
Autoreceptors
Synapses
Metabotropic Glutamate Receptors
Glutamic Acid
Presynaptic Receptors
Pyramidal Cells
Homeostasis

Keywords

  • CELLBIO
  • MOLNEURO

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Role of Glutamate Autoreceptors at Hippocampal Mossy Fiber Synapses. / Kwon, Hyung Bae; Castillo, Pablo E.

In: Neuron, Vol. 60, No. 6, 26.12.2008, p. 1082-1094.

Research output: Contribution to journalArticle

Kwon, Hyung Bae ; Castillo, Pablo E. / Role of Glutamate Autoreceptors at Hippocampal Mossy Fiber Synapses. In: Neuron. 2008 ; Vol. 60, No. 6. pp. 1082-1094.
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