Lack of voltage-operated calcium channel in rat glioma C6 cells.
We examined whether rat glioma C6 cells have voltage-operated Ca2+ channel (VOC) or not. The addition of high K+ did not affect the cytoplasmic Ca2+ concentration ([Ca2+]i). In addition, BAY K 8644, a VOC against, did not increase [Ca2+]i even in the presence of high K+. Bombesin (BBS), an inositol trisphosphate-generating drug, and thapsigargin (TG), a microsomal Ca(2+)-ATPase inhibitor, increased [Ca2+]i, after which it decreased to a sustained, and still higher than original level. The addition of verapamil, diltiazem and nimodipine did not affect an increase in [Ca2+]i induced by BBS and TG. The addition of SK&F 96365, a receptor-operated Ca2+ channel (ROC) blocker, reduced the sustained increase in [Ca2+]i induced by BBS and TG. The present results suggest that VOC does not exist in rat glioma C6 cells and this cell line is a good model for investigating signal transduction via ROC as glial cells.
Imoto
K
K
Department of Pharmacology, School of Medicine, Sapporo Medical University, Japan.
Takemura
H
H
Kaneko
M
M
Ohshika
H
H
D001498:3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester / Q000494:pharmacology; D000818:Animals; D002118:Calcium / Q000378:metabolism; D015220:Calcium Channels / Q000502:physiology*; D005910:Glioma / Q000378:metabolism*; D051381:Rats; D014407:Tumor Cells, Cultured
D015220:Calcium Channels; D001498:3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester; D002118:Calcium