Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research
Date (from‐to) : 2014/04 -2018/03
Author : Imaizumi Yuji; Higuchi Tsunehiko; Asai Kiyofumi; Hirono Syuichi
The present study revealed that in non-excitable cells such as chondrocytes andendothelial cells, Ca2+-activated K+ (KCa) channels and store-operated Ca2+ (SOC) channels play significant roles in the positive feedback mechanism for the regulation of intracellular Ca2+ concentration ([Ca2+]i). This [Ca2+]i elevation forms cellular responses to various types of stimulations in physiological conditions or gets involved in pathological process. In chondrocytes, it is demonstrated that ion channels, such as large-conductance Ca2+-activated K+ (BK) channels, Ca2+-release-activated Ca2+ (CRAC) channels, ClC-3 and ClC-7, are involved in progression of osteoarthritis. In brain capillary endothelial cells, hypoxic stress induces the up-regulation of Kir2.1, augment of positive-feedback mechanisms and promotion of cell proliferation. These events may play a role in disruption of blood-brain-barrier after cerebral hypoxia.