OUABAIN INCREASES THE CALCIUM-CONCENTRATION IN INTRACELLULAR STORES INVOLVED IN STIMULUS-RESPONSE COUPLING IN HUMAN PLATELETS

被引:22
作者
ROEVENS, P
DECOURCELLES, DD
机构
[1] Department of Biochemistry II, Janssen Research Foundation
关键词
Chlorotetracycline; Human platelets; Ouabain; Quin; 2; Stimulus-response coupling;
D O I
10.1161/01.RES.67.6.1494
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
The effect of ouabain on Ca2+ homeostasis in human platelets was studied using both quin 2 and chlorotetracycline to monitor changes in cytosolic Ca2+ as well as changes in the amount of Ca2+ accumulated in intracellular storage sites. In resting platelets, ouabain induces a concentration- and time-dependent increase in cytosolic Ca2+ concentration and a marked elevation of Ca2+ in the intracellular stores. The amount of Ca2+ mobilized from these stores upon stimulation with thrombin, as well as thrombin-induced secretion of platelet 5-hydroxytryptamine, was increased after preincubation with the glycoside (3 x 10-6 M). These data show that ouabain induces an elevation of intracellular Ca2+ levels, most likely mediated via Na+-Ca+ exchange, and that this incremental amount of Ca2+ is accumulated in an intracellular store involved in stimulus-response coupling. This may explain the enhanced functional responses of platelets to agonists in the presence of ouabain and suggests a role for Na+-Ca2+ exchange in Ca2+ homeostasis of the human platelet.
引用
收藏
页码:1494 / 1502
页数:9
相关论文
共 40 条
[1]   CAN CA ENTRY VIA NA-CA EXCHANGE DIRECTLY ACTIVATE CARDIAC-MUSCLE CONTRACTION [J].
BERS, DM ;
CHRISTENSEN, DM ;
NGUYEN, TX .
JOURNAL OF MOLECULAR AND CELLULAR CARDIOLOGY, 1988, 20 (05) :405-414
[2]  
BLAUSTEIN MP, 1988, J CARDIOVASC PHARM, V12, pS56
[3]   MEASUREMENT OF CA-2+ CONCENTRATIONS IN LIVING CELLS [J].
BLINKS, JR ;
WIER, WG ;
HESS, P ;
PRENDERGAST, FG .
PROGRESS IN BIOPHYSICS & MOLECULAR BIOLOGY, 1982, 40 (1-2) :1-114
[4]  
BOVA S, 1989, Biophysical Journal, V55, p469A
[5]  
BRASS LF, 1984, J BIOL CHEM, V259, P2571
[6]  
BRASS LF, 1985, J BIOL CHEM, V260, P5172
[7]   FLUORESCENCE AND BIOLUMINESCENCE MEASUREMENT OF CYTOPLASMIC FREE CALCIUM [J].
COBBOLD, PH ;
RINK, TJ .
BIOCHEMICAL JOURNAL, 1987, 248 (02) :313-328
[8]   INCREASED MEMBRANE-BOUND CALCIUM IN PLATELETS OF HYPERTENSIVE PATIENTS [J].
COOPER, R ;
LIPOWSKI, J ;
FORD, E ;
SHAMSI, N ;
FEINBERG, H ;
LEBRETON, G .
HYPERTENSION, 1989, 13 (02) :139-144
[9]  
DECOURCELLES DD, 1989, J BIOL CHEM, V264, P3274
[10]  
DECOURCELLES DD, 1985, J BIOL CHEM, V260, P5762