Axoplasm isolation from peripheral nerve.

Axoplasm isolation from peripheral nerve.
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DOI:
10.1002/dneu.20755
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发表时间:
2010-02
影响因子:
3
通讯作者:
Fainzilber, Mike
Fainzilber, Mike
中科院分区:
医学3区
文献类型:
--
作者:
Rishal, Ida;Michaelevski, Izhak;Rozenbaum, Meir;Shinder, Vera;Medzihradszky, Katalin F.;Burlingame, Alma L.;Fainzilber, Mike
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轴突细胞质组成的局部变化对许多生物学过程至关重要,包括轴突导向、对损伤的反应、轴突生长和轴突-胶质细胞相互作用。这些机制的生物化学和分子生物学研究主要集中在体外系统,由于难以获得亚细胞提取物从哺乳动物组织在体内。由于体外系统可能无法复制体内情况,可靠的方法从整个神经轴浆提取将有助于轴突的机制研究。在这里,我们开发和评估一种新的程序,从大鼠周围神经轴浆的制备,基于孵育分离的短段神经束在低渗介质中分离髓鞘和溶解非轴突结构,然后提取剩余的轴突富集材料。我们表明,这种新的程序减少了血清和神经胶质细胞的污染,并有利于轴突内容物的蛋白质组学分析。
Localized changes in the composition of axonal cytoplasm (axoplasm) are critical for many biological processes, including axon guidance, responses to injury, neurite outgrowth, and axon-glia interactions. Biochemical and molecular studies of these mechanisms have been heavily focused on in vitro systems, due to the difficulty of obtaining subcellular extracts from mammalian tissues in vivo. Since in vitro systems might not replicate the in vivo situation, reliable methods of axoplasm extraction from whole nerve would be helpful for mechanistic studies on axons. Here we develop and evaluate a new procedure for preparation of axoplasm from rat peripheral nerve, based on incubation of separated short segements of nerve fascicles in hypotonic medium to separate myelin and lyse non-axonal structures, followed by extraction of the remaining axon-enriched material. We show that this new procedure reduces serum and glial cell contamination, and facilitates proteomic analyses of axonal contents.
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