Referenced in: none

Automatically associated channels: Slo1 , TRP , TRPC , TRPC3

Title: STIM1 controls neuronal Ca²⁺ signaling, mGluR1-dependent synaptic transmission, and cerebellar motor behavior.

Authors: Jana Hartmann, Rosa M Karl, Ryan P D Alexander, Helmuth Adelsberger, Monika S Brill, Charlotta Rühlmann, Anna Ansel, Kenji Sakimura, Yoshihiro Baba, Tomohiro Kurosaki, Thomas Misgeld, Arthur Konnerth

Journal, date & volume: Neuron, 2014 May 7 , 82, 635-44

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/24811382

Abstract
In central mammalian neurons, activation of metabotropic glutamate receptor type1 (mGluR1) evokes a complex synaptic response consisting of IP3 receptor-dependent Ca(2+) release from internal Ca(2+) stores and a slow depolarizing potential involving TRPC3 channels. It is largely unclear how mGluR1 is linked to its downstream effectors. Here, we explored the role of stromal interaction molecule 1 (STIM1) in regulating neuronal Ca(2+) signaling and mGluR1-dependent synaptic transmission. By analyzing mouse cerebellar Purkinje neurons, we demonstrate that STIM1 is an essential regulator of the Ca(2+) level in neuronal endoplasmic reticulum Ca(2+) stores. Both mGluR1-dependent synaptic potentials and IP3 receptor-dependent Ca(2+) signals are strongly attenuated in the absence of STIM1. Furthermore, the Purkinje neuron-specific deletion of Stim1 causes impairments in cerebellar motor behavior. Together, our results demonstrate that in the mammalian nervous system STIM1 is a key regulator of intracellular Ca(2+) signaling, metabotropic glutamate receptor-dependent synaptic transmission, and motor coordination.