Evidence for the subsynaptic zone as a preferential site for CHRN recycling at neuromuscular junctions

Evidence for the subsynaptic zone as a preferential site for CHRN recycling at neuromuscular junctions
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突触下区作为神经肌肉接头处 CHRN 回收的优先位点的证据

DOI:
10.1080/21541248.2017.1324939
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Rudolf
Rudolf
中科院分区:
--
文献类型:
--
作者:
Rudolf

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脊椎动物骨骼肌收缩是由烟碱乙酰胆碱受体(CHRN)介导的。 CHRN 的内吞作用和再循环调节它们在神经肌肉突触(即神经肌肉接头)处的适当丰度。最近的研究表明 RAB5 对于 CHRN 内吞作用至关重要。在这里,利用内吞 CHRN 和 RAB-GFP 融合蛋白的体内成像,我们提供了 RAB5-GFP、RAB4-GFP 和 RAB11-GFP 对 CHRN 内吞作用的不同影响的证据。此外,虽然新内吞的 CHRN 与 RAB5-GFP 在大片肌纤维上共定位,但 RAB4-GFP 和 RAB11-GFP 与内吞的 CHRN 几乎只在神经肌肉接头处共定位。与之前的发现一致,该数据表明存在一个与 CHRN 回收特别相关的特殊突触亚区。
Vertebrate skeletal muscle contraction is mediated by nicotinic acetylcholine receptors (CHRN). Endocytosis and recycling of CHRN regulate their proper abundance at nerve-muscle synapses, i.e. neuromuscular junctions. Recent work showed that RAB5 is essential for CHRN endocytosis. Here, using in vivo-imaging of endocytosed CHRN and RAB-GFP fusion proteins, we deliver evidence for differential effects of RAB5-GFP, RAB4-GFP, and RAB11-GFP on CHRN endocytosis. Furthermore, while newly endocytosed CHRN colocalized with RAB5-GFP over large stretches of muscle fibers, RAB4-GFP and RAB11-GFP colocalized with endocytosed CHRN almost exclusively at neuromuscular junctions. In agreement with previous findings, this data suggests the existence of a specialized subsynaptic zone that is particularly relevant for CHRN recycling.
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