The effects of halothane on arginine-vasopressin-induced Ca2+ mobilization from the intracellular stores and the receptor-mediated Ca2+ entry from the extracellular space in single cultured smooth muscle cells of rat aorta

被引:6
作者
Fujihara, H
Fukuda, S
Fujiwara, N
Shimoji, K
机构
关键词
D O I
10.1097/00000539-199609000-00026
中图分类号
R614 [麻醉学];
学科分类号
100217 ;
摘要
Halothane has a direct action on vascular smooth muscle cells and causes relaxation of these cells, yet neither the mechanism nor the site of its action is completely understood. Using digital imaging microscopy with the Ca2+ indicator fura-2, the effects of halothane on the intracellular [Ca2+] dynamics induced by arginine vasopressin (AVP) in the perinuclear region and cytosol in single cultured smooth muscle cells of rat aorta were studied. Changes in intracellular [Ca2+] were expressed as percent increases in the ratios of fluorescence intensity at 500 nm excited by 340 nm and 380 nm. AVP (10(-7) M) elicited an initial transient increase in [Ca2+] in the perinuclear region higher than that in the cytosol in Ca2+-containing solution (346% +/- 21% and 213% +/- 22%, respectively). Halothane, 0.5%, attenuated the [Ca2+] increase induced by AVP in the perinuclear region and cytosol, and halothane, 1.0% and 2.0%, abolished the differential increase. Under the continuous application of AVP (10(-7) M), Ca2+ restoration in the medium after perfusion with Ca2+-free solution increased the perinuclear [Ca2+] more than the cytosolic [Ca2+]. Both were significantly attenuated by 2.0% halothane, but not by nicardipine (10(-5) M) or ryanodine (10(-6) M). Our results suggest that halothane may attenuate the Ca2+ release from the intracellular Ca2+ stores more than the receptor-mediated Ca2+ entry from the extracellular space in the AVP-induced response in these cells.
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页码:584 / 590
页数:7
相关论文
共 26 条
[21]  
SILL JC, 1991, MOL PHARMACOL, V40, P1006
[22]  
SILL JC, 1993, J PHARMACOL EXP THER, V265, P74
[23]   EXCITATION-CONTRACTION COUPLING AND THE ULTRASTRUCTURE OF SMOOTH-MUSCLE [J].
SOMLYO, AP .
CIRCULATION RESEARCH, 1985, 57 (04) :497-507
[24]   SIGNAL-TRANSDUCTION AND REGULATION IN SMOOTH-MUSCLE [J].
SOMLYO, AP ;
SOMLYO, AV .
NATURE, 1994, 372 (6503) :231-236
[25]   MEASUREMENT OF CYTOSOLIC FREE CA-2+ IN INDIVIDUAL SMALL CELLS USING FLUORESCENCE MICROSCOPY WITH DUAL EXCITATION WAVELENGTHS [J].
TSIEN, RY ;
RINK, TJ ;
POENIE, M .
CELL CALCIUM, 1985, 6 (1-2) :145-157
[26]   EFFECTS OF HALOTHANE AND ISOFLURANE ON CYTOSOLIC CALCIUM-ION CONCENTRATIONS AND CONTRACTION IN THE VASCULAR SMOOTH-MUSCLE OF THE RAT AORTA [J].
TSUCHIDA, H ;
NAMBA, H ;
YAMAKAGE, M ;
FUJITA, S ;
NOTSUKI, E ;
NAMIKI, A .
ANESTHESIOLOGY, 1993, 78 (03) :531-540