Calcium Release from Stores Inhibits GIRK

Paul F. Kramer, John T. Williams

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


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
Issue number12
StatePublished - Dec 20 2016


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

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)


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