[8-(N,N-diethylamino)-n-octyl-3,4,5-trimethoxybenzoate(TMB-8) reduced the elevation of [Ca2+]i induced by BHQ, NE and KCl in cultured single smooth muscle cells of the calf basilar artery].
The effect of 8-(N, N-diethylamino)-n-octyl-3,4,5-trimethoxybenzoate (TMB-8) on the elevation of [Ca2+]i induced by 2, 5-di (tert-butyl)-1, 4-benzohydroquinone (BHQ), norepinephrine (NE), KCl in cultured single smooth muscle cells of the calf basilar artery was studied by a system of measurement of AR-CM-MIC, using Fura-2/AM as a fluoresent indicator. In the presence of extracellular Ca2+ 1.3 mmol.L-1, the resting [Ca2+]i was not changed by TMB-8 (10, 30 and 100 mumol.L-1), but the elevation of [Ca2+]i induced by BHQ, NE and KCl were reduced by TMB-8 (30 mumol.L-1) significantly. In Ca2+ free Hank's solution containing EGTA 0.1 mmol.L-1, the resting [Ca2+]i was markedly reduced by TMB-8 (10, 30 and 100 mumol.L-1), and the increase of [Ca2+]i evoked by BHQ and NE was blocked completely by TMB-8 (30 mumol.L-1). The result suggested that TMB-8 inhibited the Ca2+ release from intracellular stores or increased the up-take of Ca2+ into sarcoplasmic reticulum and the inhibition of Ca(2+)-influx from extracellular site may be an indirect machanism.
Wang
B
B
Department of Pharmacology, Nanjing Medical University, Nanjing 210029.
Zhang
X Q
XQ
Wang
J X
JX
Yang
S J
SJ
Xiao
J G
JG
D000818:Animals; D000831:Animals, Newborn; D001488:Basilar Artery / Q000166:cytology / Q000378:metabolism; D001693:Biological Transport, Active; D002118:Calcium / Q000378:metabolism*; D002121:Calcium Channel Blockers / Q000494:pharmacology; D002417:Cattle; D002478:Cells, Cultured; D005260:Female; D005707:Gallic Acid / Q000031:analogs & derivatives* / Q000494:pharmacology*; D006873:Hydroquinones / Q000037:antagonists & inhibitors*; D008297:Male; D009131:Muscle, Smooth, Vascular / Q000166:cytology / Q000378:metabolism*; D009638:Norepinephrine / Q000037:antagonists & inhibitors*; D011189:Potassium Chloride / Q000037:antagonists & inhibitors
D002121:Calcium Channel Blockers; D006873:Hydroquinones; C019359:2,5-di-tert-butylhydroquinone; C006014:8-(N,N-diethylamino)octyl-3,4,5-trimethoxybenzoate; D005707:Gallic Acid; D011189:Potassium Chloride; D002118:Calcium; D009638:Norepinephrine