Journal of Pharmacological Sciences
Online ISSN : 1347-8648
Print ISSN : 1347-8613
ISSN-L : 1347-8613
Short Communication
Membrane Hyperpolarization Induced by Endoplasmic Reticulum Stress Facilitates Ca2+ Influx to Regulate Cell Cycle Progression in Brain Capillary Endothelial Cells
Hiroaki KitoHisao YamamuraYoshiaki SuzukiSusumu OhyaKiyofumi AsaiYuji Imaizumi
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2014 Volume 125 Issue 2 Pages 227-232

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Abstract

Upregulation of the Kir2.1 channel during endoplasmic reticulum (ER) stress in t-BBEC117, an immortalized bovine brain endothelial cell line, caused a sustained increase in intracellular Ca2+ concentration ([Ca2+]i) and a facilitation of cell death. Expressions of Ca2+ influx channels (TRPC, Orai1, STIM1) were unchanged by ER stress. The ER stress–induced [Ca2+]i increase was mainly attributed to the deeper resting membrane potential due to Kir2.1 upregulation. ER stress arrested at the G2/M phase and it was attenuated by an inhibitor of Kir2.1. These results indicate that Kir2.1 upregulation by ER stress facilitates cell death via regulation of cell cycle progression in t-BBEC117.

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© 2014 The Japanese Pharmacological Society
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