首页> 外文期刊>Nature >Calcium influx and transmitter release in a fast CNS synapse.
【24h】

Calcium influx and transmitter release in a fast CNS synapse.

机译:钙内流和递质在快速的CNS突触中释放。

获取原文
获取原文并翻译 | 示例
           

摘要

Calcium entry through presynaptic calcium channels controls the release of neurotransmitter. It is not known whether the putative calcium sensor that triggers this rapid neurotransmitter release is close enough to be activated by the large increase in the Ca2+ concentration (calcium 'domain') reached within nanometres of a single calcium channel or whether many channels have to open. We tested this in a calyx-type synapse in the rat medial nucleus of the trapezoid body. We compared the quantal content of postsynaptic currents with the presynaptic calcium current that flows during an action potential, and the results suggest that more than 60 calcium channels open for each vesicle that is released. In addition, we dialysed terminals with the slow calcium buffer EGTA, which reduced phasic transmitter release at concentrations as low as 1 mM. These results indicate that the distance that calcium ions must diffuse to reach the calcium sensor is relatively long, and that therefore Ca2+ entry through multiple calcium channels is needed to release a vesicle.
机译:钙通过突触前钙通道的进入控制神经递质的释放。尚不知道触发这种快速神经递质释放的推定钙传感器是否足够接近,足以被单个钙通道的纳米级范围内的Ca2 +浓度(钙“结构域”)大幅增加所激活,还是必须打开许多通道? 。我们在梯形体大鼠内侧核的萼形突触中对此进行了测试。我们将突触后电流的定量含量与动作电位期间流动的突触前钙电流进行了比较,结果表明,释放的每个囊泡均开放了60多个钙通道。此外,我们用慢钙缓冲液EGTA透析了末端,该缓冲液在低至1 mM的浓度下减少了相位递质释放。这些结果表明,钙离子必须扩散才能到达钙传感器的距离相对较长,因此需要Ca2 +通过多个钙通道进入才能释放囊泡。

著录项

  • 来源
    《Nature》 |1996年第6599期|P.431-434|共4页
  • 作者

    Borst JG; Sakmann B;

  • 作者单位

    Abteilung Zellphysiologie, Max-Planck-Institut fur medizinische Forschung, Heidelberg, Germany. borst@sunny.mpimf.heidelberg.mpg.de;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 基础医学;
  • 关键词

    Calcium; Neurotransmitters; Synapses; Calcium Channels; Egtazic Acid; 钙; 神经递质; 突触;

    机译:Calcium;Neurotransmitters;Synapses;Calcium Channels;Egtazic Acid;钙;神经递质;突触;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号