Positive inotropic and toxic effects of brevetoxin-B on rat and guinea pig heart.
Positive inotropic and toxic effects of brevetoxin-B on rat and guinea pig heart.
复制标题
短链毒素 B 对大鼠和豚鼠心脏的正性肌力作用和毒性作用。
DOI:
10.1016/0041-008x(84)90011-5
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发表时间:
1984
影响因子:
3.8
通讯作者:
Shimizu,Y
中科院分区:
文献类型:
--
作者:
Rodgers,RL;Chou,HN;Temma,K;Akera,T;Shimizu,Y
Brevetoxin-B (GbTX-B), a cyclic polyether purified from the marine dinoflagellate Gymnodinium breve, produced positive inotropic and arrhythmogenic effects on isolated rat and guinea pig cardiac preparations at concentrations between 1.25 × 10−8and 1.87 × 10−7m. The toxin (10−7m) transiently increased left ventricular +dP dt , hydraulic work, and oxygen consumption of paced working rat hearts, then reduced these variables during continuous exposure. Brevetoxin-B exerted a much smaller positive inotropic effect on working guinea pig hearts, but produced a marked and sustained inotropic effect on guinea pig left atria. The toxin also produced arrhythmias in rat and guinea pig hearts, characterized by ventricular tachycardia and A-V blockade. Sympatholytic procedures (β blockade or reserpine pretreatment) partially blocked the positive inotropic effects, and eliminated the ventricular tachycardia, but not the A-V blockade. Tetrodotoxin markedly inhibited the positive inotropic effect of GbTX-B. Brevetoxin-B did not inhibit guinea pig cardiac Na,K-ATPase activities. The results show that GbTX-B is a potent cardiotoxin and suggest that GbTX-B exerts positive inotropic and arrhythmogenic effects by increasing sarcolemmal sodium permeability, and by releasing catecholamines from sympathetic nerve endings.
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DOI:
10.1007/bfb0030502
发表时间:
1982
期刊:
Reviews of physiology, biochemistry and pharmacology
影响因子:
--
作者:
Peter Honerjäger
通讯作者:
Peter Honerjäger
影响因子:
5
作者:
S. Kayaalp;E. Albuquerque;J. E. Warnick
通讯作者:
J. E. Warnick
影响因子:
2.8
作者:
BADEN, DG;MENDE, TJ;WELLHAM, L
通讯作者:
WELLHAM, L
影响因子:
7.3
作者:
H. Borison;S. Ellis;L. McCarthy
通讯作者:
L. McCarthy
影响因子:
20.1
作者:
P. Honerjager;M. Reiter
通讯作者:
M. Reiter