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首页> 外文期刊>Chinese science bulletin >ALPHA-LTX and ALPHA -LTX~(N4C) induce [Ca~(2+)], elevation through different mechanisms in pancreatic BETA cells
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ALPHA-LTX and ALPHA -LTX~(N4C) induce [Ca~(2+)], elevation through different mechanisms in pancreatic BETA cells

机译:ALPHA-LTX和ALPHA-LTX〜(N4C)通过不同的机制诱导胰腺BETA细胞中的[Ca〜(2+)]升高

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摘要

alpha-latrotoxin (alpha -LTX),a neurotoxin from black-widow spider,causes vesicles release in pre-synapse of nerve terminal after binding to specific membrane receptors.alpha -LTX~(N4C) is an effective tool binding to calcium independent receptor for latrotoxin (CIRL), which is used to elucidate the mechanism of receptor-mediated signal pathway.In our study on the pancreatic beta cells,we found that alpha -LTX inserts into the plasma membrane and forms stable non-selective cation channels.The influx of extracellular Ca~(2+) through the channels causes massive Ca~(2+)-dependent exocytosis of insulin-containing vesicles, whereas, alpha -LTX~(N4C), binding with its receptor CIRL in extracellular divalent cation-dependent way,increases [Ca~(2+)]_i by mobilization of the intracellular calcium stores.
机译:黑寡妇蜘蛛产生的神经毒素α-拉托毒素(α-LTX)导致囊泡在与特定膜受体结合后在神经末梢的突触前释放。α-LTX〜(N4C)是一种与钙独立受体结合的有效工具用于阐明Latotoxin(CIRL),用于阐明受体介导的信号通路的机制。在我们对胰岛β细胞的研究中,我们发现α-LTX插入质膜并形成稳定的非选择性阳离子通道。通过通道流入细胞外Ca〜(2+)会导致大量依赖Ca〜(2+)的胰岛素囊泡胞吐作用,而α-LTX〜(N4C)则与其受体CIRL结合,从而导致细胞外二价阳离子依赖性通过动员细胞内钙存储增加[Ca〜(2 +)] _ i。

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