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Phosphorylation and compactness of neurofilaments in multiple sclerosis: Indicators of axonal pathology

Petzold, A; Gveric, D; Groves, M; Schmierer, K; Grant, D; Chapman, M; Keir, G; ... Thompson, EJ; + view all (2008) Phosphorylation and compactness of neurofilaments in multiple sclerosis: Indicators of axonal pathology. Experimental Neurology , 213 (2) 326 - 335. 10.1016/j.expneurol.2008.06.008. Green open access

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Abstract

Aims: Axonal pathology extends to the axonal cytoarchitecture leaving its Signature on axoskeletal proteins. This study investigated whether neurofilament (NfH) phosphorylation would relate to the dynamics of axonal pathology in multiple sclerosis (MS).Methods: NfH phosphoforms (SM132, SM134, SM135) were quantified by ELISA from microdissected samples of control and MS brain and spinal cord. Individual axons were analysed by electron microscopy, densitometrically and morphologically in adjacent tissue sections. Experiments were Carried Out pre- and post enzymatic dephosphorylation.Results: In control tissue a rostro-caudal gradient of NfH indicated an increase in axonal density from the brain gray matter towards the spinal cord. The highest levels of phosphorylated and hyperphosphorylated NfH were found in acute lesions of brain and spinal cord, in contrast to chronic lesions where levels were lower than in white matter, consistent with axonal loss. Dephosphorylated NfH was higher, but less densly packed in MS white matter axons compared to control tissue.Conclusions: The findings suggest that a less organised/compact axoskeleton or impaired axonal transport may represent an early sign of axonal pathology within the normal appearing white matter in MS. Subsequently a proportional increase of dephosphorylated NfH, aberrant phosphorylation and/or aggregation may occur whilst the protein is transported through the white matter towards the MS plaque, where hyperphosphorylated NfH dominates. (c) 2008 Elsevier Inc. All rights reserved.

Type: Article
Title: Phosphorylation and compactness of neurofilaments in multiple sclerosis: Indicators of axonal pathology
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.expneurol.2008.06.008
Publisher version: http://dx.doi.org/10.1016/j.expneurol.2008.06.008
Language: English
Keywords: neurofilament phosphoforms, multiple sclerosis, axonal injury, WALLERIAN DEGENERATION, WHITE-MATTER, NOGO-A, GLUTAMATE, DAMAGE, LESIONS, PROTEINS, DISEASE, INJURY, NEURODEGENERATION
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
URI: https://discovery.ucl.ac.uk/id/eprint/177309
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