STIM1 Regulates Somatic Ca Signals and Intrinsic Firing Properties of Cerebellar Purkinje Neurons

Overview

Journal J Neurosci

Specialty Neurology

Date 2017 Aug 20

PMID 28821659

Citations 41

Authors

Changhyeon Ryu

Dong Cheol Jang

Dayoon Jung

Yong Gyu Kim

Hyun Geun Shim

Hyun-Hee Ryu

Yong-Seok Lee

David J Linden

Paul F Worley

Sang Jeong Kim

Affiliations

Soon will be listed here.

Abstract

Control of Ca flux between the cytosol and intracellular Ca stores is essential for maintaining normal cellular function. It has been well established in both neuronal and non-neuronal cells that stromal interaction molecule 1 (STIM1) initiates and regulates refilling Ca into the ER. Here, we describe a novel, additional role for STIM1, the regulation of free cytosolic Ca, and the consequent control of spike firing in neurons. Among central neurons, cerebellar Purkinje neurons express the highest level of STIM1, and they fire continuously in the absence of stimulation, making somatic Ca homeostasis of particular importance. By using Purkinje neuron-specific STIM1 knock-out (STIM1) male mice, we found that the deletion of STIM1 delayed clearance of cytosolic Ca in the soma during ongoing neuronal firing. Deletion of STIM1 also reduced the Purkinje neuronal excitability and impaired intrinsic plasticity without affecting long-term synaptic plasticity. In vestibulo-ocular reflex learning, STIM1 male mice showed severe deficits in memory consolidation, whereas they were normal in memory acquisition. Our results suggest that STIM1 is critically involved in the regulation of the neuronal excitability and the intrinsic plasticity of the Purkinje neurons as well as cerebellar memory consolidation. Stromal interaction molecule 1 (STIM1), which regulates the refilling of ER Ca, has been investigated in several systems including the CNS. In addition to a previous study showing that STIM1 regulates dendritic ER Ca refilling and mGluR1-mediated synaptic transmission, we provide compelling evidence describing a novel role of STIM1 in spike firing Purkinje neurons. We found that STIM1 regulates cytosolic Ca clearance of the soma during spike firing, and the interruption of this cytosolic Ca clearing disrupts neuronal excitability and cerebellar memory consolidation. Our results provide new insights into neuronal functions of STIM1 from single neuronal Ca dynamics to behavior level.

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