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- W2019978409 abstract "Axonal loss in Charcot-Marie-Tooth type 1A (CMT1A) is an important feature correlated with the functional disability in affected individuals. It is not known, however, how the most common genetic defect in Schwann cells (PMP22 duplication) causes the CMT1A phenotype and results in axonal loss. In this study, sural nerve segments from individuals with PMP22 duplications or deletions, causing the reciprocal disorder hereditary neuropathy with pressure palsies (HNPP), were grafted into the cut ends of the sciatic nerve of nude mice. The xenografts and host segments were studied at 2, 4, 6, 8, 12, and 16 weeks after grafting and compared with the controls from healthy volunteers. Within the CMT1A xenografts, the nude mice axons in the proximal part of the graft showed a significant increase in axonal area with an increase in the neurofilament and membranous organelle (mitochondria) density, compared with distal graft and distal host segments. A preferential distal axonal loss, associated with a perpetual axonal atrophy, degeneration, and axonal sprouting was observed over time, with increasing intensity at 8 to 16 weeks. These alterations were seen to a lesser extent in HNPP xenografts and were not observed in controls. In addition, the onset of regeneration-associated myelination was delayed, more significantly in HNPP xenografts than those of CMT1A. Our findings indicate that the PMP22 duplication in Schwann cells results in an impairment in the normal axonal cytoskeletal organization, resulting in distal axonal degeneration and fiber loss, and the affect of PMP22 deletion on axonal cytoskeleton is less deleterious. Ann Neurol 1999;45:16–24" @default.
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- W2019978409 date "1999-01-01" @default.
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- W2019978409 title "Effects of PMP22 duplication and deletions on the axonal cytoskeleton" @default.
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- W2019978409 doi "https://doi.org/10.1002/1531-8249(199901)45:1<16::aid-art5>3.0.co;2-f" @default.
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