Altered expression of microtubule-associated proteins in cat trochlear motoneurons after peripheral and central lesions of the trochlear nerve.

Abstract:

:Neurons lesioned in the peripheral nervous system (PNS) generally regenerate and survive, while neurons lesioned in the central nervous system (CNS) do not regenerate and often die. Investigators have traditionally compared the neuronal responses to PNS and CNS lesions in two separate populations of neurons. In this study, we compared the effects of PNS and CNS lesions on the expression of cytoskeletal proteins in a single neuronal population, the trochlear motoneurons of the cat. The trochlear nerve was lesioned either unilaterally in the PNS or bilaterally in the CNS (within the anterior medullary velum), and animals were allowed to survive 1, 2, or 4 weeks. Brain sections were reacted immunocytochemically using antibodies against microtubule -associated protein-2 (MAP-2) and a phosphorylated isoform of MAP1B, termed MAP1B-P. MAP-2 immunoreactivity (IR) was significantly decreased in the CNS-lesioned trochlear nucleus, compared to the lesioned and the unlesioned trochlear nucleus of PNS-lesioned animals. MAP1B-P IR was significantly increased in PNS- and CNS- lesioned trochlear axons, compared to axons in the unlesioned trochlear nerve of PNS-lesioned animals, and appeared in a small percentage of PNS- and CNS-lesioned cell bodies. These results support the growing body of evidence that MPA-2 can serve as a marker for cells that will eventually die following neuronal insult. The increased immunostaining of MAP1B-P in lesioned axons and its appearance in lesioned cell bodies are characteristic of the immature CNS and may reflect an initial recapitulation of early development, when the levels of this protein are high.

journal_name

Exp Neurol

journal_title

Experimental neurology

authors

Book AA,Fischer I,Yu XJ,Iannuzzelli P,Murphy EH

doi

10.1006/exnr.1996.0060

subject

Has Abstract

pub_date

1996-04-01 00:00:00

pages

214-26

issue

2

eissn

0014-4886

issn

1090-2430

pii

S0014-4886(96)90060-6

journal_volume

138

pub_type

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