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首页> 外文期刊>Brain research >Evolution of myelin ultrastructure and the major structural myelin proteins
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Evolution of myelin ultrastructure and the major structural myelin proteins

机译：髓磷脂超微结构和主要结构髓磷脂蛋白的演变

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Myelin sheaths, as the specialized tissue wrapping the nerve fibers in the central and peripheral nervous systems (CNS and PNS), are responsible for rapid conduction of electrical signals in these fibers. We compare the nerve myelin sheaths of different phylogenetic origins-including mammal, rodent, bird, reptile, amphibian, lungfish, teleost, and elasmobranch-with respect to periodicities and inter-membrane separations at their cytoplasmic and extracellular appositions, and correlate these structural parameters with biochemical composition. PO glycoprotein and PO-like proteins are present in PNS of terrestrial species or land vertebrates (Tetrapod) and in CNS and PNS of aquatic species. Proteolipid protein (PLP) is a major component only in the CNS myelin of terrestrial species and is involved in compaction of the extracellular apposition. The myelin structures of aquatic garfish and lungfish, which contain PO-like protein both in CNS and PNS, are similar to those of terrestrial species, indicating that they may be transitional organisms between water and land species.
机译：髓鞘是包裹中枢神经系统和周围神经系统（CNS和PNS）的神经纤维的专门组织，负责在这些纤维中快速传导电信号。我们比较了不同系统发生起源的神经髓鞘，包括哺乳动物，啮齿动物，鸟类，爬行动物，两栖动物，肺鱼，硬骨鱼和弹性支流在细胞质和细胞外位置的周期性和跨膜分离方面，并将这些结构参数相关联与生化组成。 PO糖蛋白和PO样蛋白存在于陆生物种或陆地脊椎动物（Tetrapod）的PNS中以及水生物种的CNS和PNS中。蛋白脂蛋白（PLP）仅在陆生物种的CNS髓磷脂中是主要成分，并且参与细胞外并置的压实。在CNS和PNS中都含有PO样蛋白的水生鱼类和肺鱼的髓磷脂结构与陆生物种的相似，表明它们可能是水和陆地物种之间的过渡生物。

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