LGI3/2-ADAM23 interactions cluster Kv1 channels in myelinated axons to regulate refractory period.

LGI3/2-ADAM23 interactions cluster Kv1 channels in myelinated axons to regulate refractory period.
复制标题

DOI:
10.1083/jcb.202211031
复制
发表时间:
2023-04-03
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
--
中科院分区:
其他
文献类型:
--
作者:

文献摘要

参考文献

相似文献

Kozar-Gillan 及其同事通过证明 LGI3/2-ADAM23 相互作用聚集并稳定有髓轴突中的 Shaker 型电压门控钾通道 (Kv1),揭示了 Ranvier 形成节点中的一种新分子途径。这些髓磷脂隐藏的 Kv1 通道有助于基本的轴突特性,以确保可靠的高频发射。沿着有髓轴突,Shaker 型钾通道 (Kv1) 在近节旁区域以高密度聚集,直接邻近朗飞节两侧的节旁轴突-神经胶质连接处。然而,人们对控制 Kv1 通道聚集的机制及其在该位点的功能仍然知之甚少。在这里,我们证明轴突 ADAM23 对于近旁节 Kv1 复合物的积累和稳定性至关重要。 ADAM23 的功能主要取决于其与其胞外配体 LGI2 和 LGI3 的相互作用。此外,我们证明近旁节 Kv1 复合体影响不应期,从而实现动作电位的高频爆发。我们的研究结果不仅揭示了以前未知的调节 Kv1 通道聚集的分子途径,而且还证明了隐藏在髓鞘下方的近节旁 Kv1 通道在改变轴突生理学方​​面发挥着重要作用。
Kozar-Gillan and colleagues reveal a novel molecular pathway in node of Ranvier formation by demonstrating that LGI3/2–ADAM23 interactions cluster and stabilize Shaker-type voltage-gated potassium channels (Kv1) in myelinated axons. These myelin concealed Kv1 channels contribute to basic axonal properties to secure reliable high-frequency firing. Along myelinated axons, Shaker-type potassium channels (Kv1) accumulate at high density in the juxtaparanodal region, directly adjacent to the paranodal axon–glia junctions that flank the nodes of Ranvier. However, the mechanisms that control the clustering of Kv1 channels, as well as their function at this site, are still poorly understood. Here we demonstrate that axonal ADAM23 is essential for both the accumulation and stability of juxtaparanodal Kv1 complexes. The function of ADAM23 is critically dependent on its interaction with its extracellular ligands LGI2 and LGI3. Furthermore, we demonstrate that juxtaparanodal Kv1 complexes affect the refractory period, thus enabling high-frequency burst firing of action potentials. Our findings not only reveal a previously unknown molecular pathway that regulates Kv1 channel clustering, but they also demonstrate that the juxtaparanodal Kv1 channels that are concealed below the myelin sheath, play a significant role in modifying axonal physiology.
DOI: 10.1189/jlb.2hi1115-525r
发表时间: 2016-11-01
影响因子: 5.5
作者:
Elizondo, D. M.;Andargie, T. E.;Lipscomb, M. W.
通讯作者: Lipscomb, M. W.
DOI: 10.1371/journal.pbio.0030159
发表时间: 2005-05
期刊: PLoS biology
影响因子: 9.8
作者:
通讯作者: --
DOI: 10.1016/j.mam.2008.08.001
发表时间: 2008-10
影响因子: 10.6
作者:
Edwards DR;Handsley MM;Pennington CJ
通讯作者: Pennington CJ
DOI: 10.1523/jneurosci.1015-11.2011
发表时间: 2011-06-01
期刊: The Journal of neuroscience : the official journal of the Society for Neuroscience
影响因子: --
作者:
Buttermore ED;Dupree JL;Cheng J;An X;Tessarollo L;Bhat MA
通讯作者: Bhat MA
DOI: 10.1371/journal.pone.0025043
发表时间: 2011
期刊: PloS one
影响因子: 3.7
作者:
Cifuentes-Diaz C;Chareyre F;Garcia M;Devaux J;Carnaud M;Levasseur G;Niwa-Kawakita M;Harroch S;Girault JA;Giovannini M;Goutebroze L
通讯作者: Goutebroze L