首页> 外文期刊>Neurochemistry International: The International Journal for the Rapid Publication of Critical Reviews, Preliminary and Original Research Communications in Neurochemistry >PnTx3-6 a spider neurotoxin inhibits K+-evoked increase in (Ca2+)(i) and Ca2+-dependent glutamate release in synaptosomes.
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PnTx3-6 a spider neurotoxin inhibits K+-evoked increase in (Ca2+)(i) and Ca2+-dependent glutamate release in synaptosomes.

机译:PnTx3-6蜘蛛神经毒素抑制突触小体中K +引起的(Ca2 +)(i)的增加和Ca2 +依赖性谷氨酸的释放。

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摘要

The present experiments investigated the effect of a neurotoxin purified from the venom of the spider Phoneutria nigriventer. This toxic component, P. nigriventer toxin 3-6 (PnTx3-6), abolished Ca(2+)-dependent glutamate release with an IC(50) of 74.4nM but did not alter Ca(2+)-independent secretion of glutamate when brain cortical synaptosomes were depolarized by KCl (33mM). This effect was most likely due to interference with the entry of calcium through voltage activated calcium channels (VACC), reducing the increase in the intrasynaptosomal free calcium induced by membrane depolarization with an IC(50) of 9.5nM. We compared the alterations induced by PnTx3-6 with the actions of toxins known to block calcium channels coupled to exocytosis. Our results indicate that PnTx3-6 inhibition of glutamate release and intrasynaptosomal calcium involves P/Q type calcium channels and this toxin can be a valuable tool in the investigation of calcium channels.
机译:本实验研究了从黑蜘蛛Phoneutria nigriventer毒液中纯化的神经毒素的作用。此有毒成分,P。Nigriventer毒素3-6(PnTx3-6),废除了Ca(2+)依赖的谷氨酸释放,IC(50)为74.4nM,但没有改变Ca(2+)依赖的谷氨酸分泌当大脑皮层突触小体被氯化钾(33mM)去极化时。这种作用最有可能是由于通过电压激活钙通道(VACC)干扰钙的进入,减少了膜去极化诱导的突触体内游离钙的增加,IC(50)为9.5nM。我们比较了由PnTx3-6诱导的改变与已知阻断钙通道与胞吐作用的毒素的作用。我们的结果表明,PnTx3-6对谷氨酸释放和突触体内钙的抑制涉及P / Q型钙通道,这种毒素可以作为研究钙通道的有价值的工具。

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