Proteolipid protein cannot replace P0 protein as the major structural protein of peripheral nervous system myelin.
GLIA(2015)
摘要
The central nervous system (CNS) of terrestrial vertebrates underwent a prominent molecular change when proteolipid protein (PLP) replaced P-0 protein as the most abundant protein of CNS myelin. However, PLP did not replace P-0 in peripheral nervous system (PNS) myelin. To investigate the possible consequences of a PLP to P-0 shift in PNS myelin, we engineered mice to express PLP instead of P-0 in PNS myelin (PLP-PNS mice). PLP-PNS mice had severe neurological disabilities and died between 3 and 6 months of age. Schwann cells in sciatic nerves from PLP-PNS mice sorted axons into one-to-one relationships but failed to form myelin internodes. Mice with equal amounts of P-0 and PLP had normal PNS myelination and lifespans similar to wild-type (WT) mice. When PLP was overexpressed with one copy of the P-0 gene, sciatic nerves were hypomyelinated; mice displayed motor deficits, but had normal lifespans. These data support the hypothesis that while PLP can co-exist with P-0 in PNS myelin, PLP cannot replace P-0 as the major structural protein of PNS myelin. GLIA 2015;63:66-77 Main Points
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关键词
Schwann cell,hypomyelination,myelin compaction,myelin evolution,axon
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