Calcium Release from Stores Inhibits GIRK

Paul F. Kramer, John Williams

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Synaptic transmission is mediated by ionotropic and metabotropic receptors that together regulate the rate and pattern of action potential firing. Metabotropic receptors can activate ion channels and modulate other receptors and channels. The present paper examines the interaction between group 1 mGluR-mediated calcium release from stores and GABAB/D2-mediated GIRK currents in rat dopamine neurons of the Substantia Nigra. Transient activation of mGluRs decreased the GIRK current evoked by GABAB and D2 receptors, although less efficaciously for D2. The mGluR-induced inhibition of GIRK current peaked in 1 s and recovered to baseline after 5 s. The inhibition was dependent on release of calcium from stores, was larger for transient than for tonic currents, and was unaffected by inhibitors of PLC, PKC, PLA2, or calmodulin. This inhibition of GABAB IPSCs through release of calcium from stores is a postsynaptic mechanism that may broadly reduce GIRK-dependent inhibition of many central neurons.

Original languageEnglish (US)
Pages (from-to)3246-3255
Number of pages10
JournalCell Reports
Volume17
Issue number12
DOIs
StatePublished - Dec 20 2016

Fingerprint

Calcium
Neurons
Dopaminergic Neurons
Substantia Nigra
Calmodulin
Programmable logic controllers
Ion Channels
Synaptic Transmission
Action Potentials
Rats
Dopamine
Chemical activation

Keywords

  • calcium
  • D2
  • dopamine neurons
  • GABA
  • GIRK inhibition
  • group I mGluR
  • IP

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

Calcium Release from Stores Inhibits GIRK. / Kramer, Paul F.; Williams, John.

In: Cell Reports, Vol. 17, No. 12, 20.12.2016, p. 3246-3255.

Research output: Contribution to journalArticle

Kramer, Paul F. ; Williams, John. / Calcium Release from Stores Inhibits GIRK. In: Cell Reports. 2016 ; Vol. 17, No. 12. pp. 3246-3255.
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