Normal nerve striations are altered in the trembler-J mouse, a model of charcot-marie-tooth disease

ABSTRACT Introduction: This study was initiated because it was noted that the peripheral nerves of Trembler‐J mice (a model of human Charcot–Marie–Tooth disease) appear to lack normal striations. Methods: We performed confocal microscopy of whole sciatic nerves and tested the effect of axial stress...

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Veröffentlicht in:Muscle & nerve 2015-02, Vol.51 (2), p.246-252
Hauptverfasser: Power, Bridget J., O'reilly, Gavin, Murphy, Robert, Murphy, Keith J., Pickering, Mark, Jones, James F.X.
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container_issue 2
container_start_page 246
container_title Muscle & nerve
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creator Power, Bridget J.
O'reilly, Gavin
Murphy, Robert
Murphy, Keith J.
Pickering, Mark
Jones, James F.X.
description ABSTRACT Introduction: This study was initiated because it was noted that the peripheral nerves of Trembler‐J mice (a model of human Charcot–Marie–Tooth disease) appear to lack normal striations. Methods: We performed confocal microscopy of whole sciatic nerves and tested the effect of axial stress on impulse conduction. Results: We found that the axons of mutant mice were longer than those of the wild‐type (1.55 mm of axon/mm length of nerve vs. 1.28 mm/mm respectively). This axonal elongation altered the helical nerve striations (bands of Fontana). As nerves were stretched axially, the conduction distance became correspondingly shorter. The effect on latency was significantly greater in the more coiled nerves of Trembler‐J mice (P = 0.038). Conclusions: The finding that mice with a mutated peripheral myelin protein 22 (PMP22) possess excessively long axons may be related to the excess Schwann cell numbers found in this disorder. Muscle Nerve 51: 246–252, 2015
doi_str_mv 10.1002/mus.24303
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subjects Action Potentials - physiology
Animals
Axons - pathology
bands of Fontana
Charcot-Marie-Tooth disease
Charcot-Marie-Tooth Disease - genetics
Charcot-Marie-Tooth Disease - metabolism
Charcot-Marie-Tooth Disease - pathology
Disease Models, Animal
Electrophysiology
Male
Medical research
Mice
Mice, Inbred C57BL
Mice, Neurologic Mutants
Microscopy, Confocal
Mutation - genetics
Myelin Proteins - genetics
Myelin Sheath - metabolism
Myelin Sheath - pathology
nerve stretch
Neural Conduction - genetics
Neural Conduction - physiology
rat
Rodents
sciatic nerve
Sciatic Nerve - metabolism
Sciatic Nerve - physiopathology
Stress, Mechanical
title Normal nerve striations are altered in the trembler-J mouse, a model of charcot-marie-tooth disease
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