A novel peptide toxin from Trimeresurus wagleri acts pre- and post-synaptically to block transmission at the rat neuromuscular junction.

A novel peptide toxin from Trimeresurus wagleri acts pre- and post-synaptically to block transmission at the rat neuromuscular junction.
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竹叶青中的一种新型肽毒素在突触前和突触后发挥作用,阻断大鼠神经肌肉接头的传递。

DOI:
10.1111/j.1600-0773.1992.tb00508.x
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发表时间:
1992
期刊:
Pharmacology & toxicology
影响因子:
--
通讯作者:
McArdle,JJ
McArdle,JJ
中科院分区:
--
文献类型:
--
作者:
Aiken,SP;Sellin,LC;Schmidt,JJ;Weinstein,SA;McArdle,JJ

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采用大鼠趾长伸肌/腓总神经标本,研究了竹叶青蛇毒肽毒素(肽I)的神经肌肉效应。亚微摩尔浓度抑制了神经刺激产生的终板电流(EPC)。由于EPCs的量子含量没有改变,似乎作用部位是突触后。然而,较高浓度(1.4-2.9 μM)也抑制递质的自发释放。在肽I存在下的神经刺激引起EPC振幅的“下降”,这证明肽在突触前起作用以干扰递质释放。这种影响在洗涤后3-5分钟内恢复,但EPC幅度需要20-30分钟才能恢复。这种肽的双重作用使其在天然存在的毒素中不寻常,这些数据表明,对这种肽(及其类似物)的进一步研究可能会产生关于神经递质释放的新信息。
The neuromuscular effects of a peptide toxin (peptide I) from venom ofTrimeresurus wagleriwere investigated using the rat extensor digitorum longus muscle/peroneal nerve preparation. Sub‐micromolar concentrations depressed endplate currents (EPCs) produced in response to nerve stimulation. Since quantal content of EPCs was not altered, it appears that the site of action is post‐synaptic. However, higher concentrations (1.4–2.9 μM) also inhibited spontaneous release of transmitter. Nerve stimulation in the presence of peptide I caused ‘rundown’ of EPC amplitude, evidence that the peptide acts pre‐synaptically to interfere with transmitter release. Recovery from this effect occurred within 3–5 min. of washing, but EPC amplitude took 20–30 min. to recover. The dual action of this peptide makes it unusual amongst naturally‐occurring toxins, and these data suggest that further investigation of the peptide (and its analogues) could yield new information about neurotransmitter release.
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