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Phosphorylated MAP1B is induced in central sprouting of primary afferents in response to peripheral injury but not in response to rhizotomy
Journal article   Peer reviewed

Phosphorylated MAP1B is induced in central sprouting of primary afferents in response to peripheral injury but not in response to rhizotomy

Sylvia Soares, Ysander von Boxberg, Marie-Christine Lombard, Michèle Ravaille-Veron, Itzhak Fischer, Joel Eyer and Fatiha Nothias
The European journal of neuroscience, v 16(4), pp 593-606
Aug 2002
DOI: https://doi.org/10.1046/j.1460-9568.2002.02126.x
PMID: 12270035
Featured in Collection :   UN Sustainable Development Goals @ Drexel

Abstract

Phosphorylation Sciatic Nerve - injuries Microtubule-Associated Proteins - analysis Rats, Wistar Mice, Inbred C57BL Nerve Regeneration - physiology RNA, Messenger - analysis Rats Male Mice, Transgenic Rhizotomy - methods Microtubule-Associated Proteins - biosynthesis Rats, Sprague-Dawley Neurons, Afferent - chemistry RNA, Messenger - biosynthesis Sciatic Nerve - metabolism Animals Neuronal Plasticity - physiology Rhizotomy - statistics & numerical data Female Mice Neurons, Afferent - metabolism
A peripheral nerve lesion induces sprouting of primary afferents from dorsal root ganglion (DRG) neurons into lamina II of the dorsal horn. Modifications of the environment in consequence to the axotomy provide an extrinsic stimulus. A potential neuron-intrinsic factor that may permit axonal sprouting is microtubule-associated protein 1B (MAP1B) in a specific phosphorylated form (MAP1B-P), restricted to growing or regenerating axons. We show here that both in rat and mouse, a sciatic nerve cut is rapidly followed by the appearance of MAP1B-P expression in lamina II, increasing to a maximum between 8 and 15 days, and diminishing after three months. Evidence is provided that sprouting and induction of MAP1B-P expression after peripheral injury are phenomena concerning essentially myelinated axons. This is in accordance with in situ hybridization data showing especially high MAP1B-mRNA levels in large size DRG neurons that give rise to myelinated fibers. We then employed a second lesion model, multiple rhizotomy with one spared root. In this case, unmyelinated CGRP expressing fibers do indeed sprout, but coexpression of MAP1B-P and CGRP is never observed in lamina II. Finally, because a characteristic of myelinated fibers is their high content in neurofilament protein heavy subunit (NF-H), we used NF-H-LacZ transgenic mice to verify that MAP1B-P induction and central sprouting were not affected by perturbing the axonal organization of neurofilaments. We conclude that MAP1B-P is well suited as a rapidly expressed, axon-intrinsic marker associated with plasticity of myelinated fibers.

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