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.
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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
Shimizu,Y
中科院分区:
医学3区
文献类型:
--
作者:
Rodgers,RL;Chou,HN;Temma,K;Akera,T;Shimizu,Y

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从海洋甲藻Gymnastinium breve中纯化的环聚醚--短鞭藻毒素-B(GbTX-B),在1.25 × 10− 8 ~ 1.87 × 10− 7 m的浓度范围内,对大鼠和豚鼠的离体心脏标本产生正性肌力作用和促心律失常作用。毒素(10− 7 m)短暂增加起搏工作大鼠心脏的左心室+dP dt、液压功和耗氧量,然后在连续暴露期间减少这些变量。对豚鼠工作心脏的正性肌力作用较小,但对豚鼠左心房有明显和持续的正性肌力作用。该毒素还在大鼠和豚鼠心脏中产生心律失常,其特征在于室性心动过速和A-V阻滞。交感神经阻滞(β受体阻滞剂或利血平预处理)可部分阻断正性肌力作用,消除室性心动过速,但不能阻断房室传导阻滞。河豚毒素明显抑制GbTX-B的正性肌力作用。Brevetoxin-B对豚鼠心肌Na,K-ATP酶活性无抑制作用。结果表明,GbTX-B是一种强有力的心脏毒素,并表明GbTX-B通过增加肌膜钠渗透性和从交感神经末梢释放儿茶酚胺来发挥正性肌力和促心律失常作用。
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.
延长钠通道开放状态的心脏活性物质。
DOI: 10.1007/bfb0030502
发表时间: 1982
期刊: Reviews of physiology, biochemistry and pharmacology
影响因子: --
作者:
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发表时间: 1970
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DOI: 10.1016/0041-0101(81)90003-9
发表时间: 1981-01-01
期刊: TOXICON
影响因子: 2.8
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影响因子: 7.3
作者:
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通讯作者: L. McCarthy
DOI: 10.1161/01.res.40.1.90
发表时间: 1977
影响因子: 20.1
作者:
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