Axonal modulation of myelin gene expression in the peripheral nerve

A. C. LeBlanc, J. F. Poduslo

Research output: Contribution to journalArticle

103 Citations (Scopus)

Abstract

Myelin gene expression (P0, MBP, P2, and MAG) was investigated during Wallerian degeneration and in the presence or absence of subsequent axonal regeneration and remyelination. The steady state levels of mRNA and protein were assessed in the crushed or permanently transected rat sciatic nerve at 0, 1, 4, 7, 10, 12, 14, 21, and 35 days after injury. The mRNA and protein steady state levels of the myelin specific genes, P0 and the MBPs, decreased to low yet detectable levels during Wallerian degeneration and returned to normal levels with subsequent axonal regeneration. The steady state level of P2 protein also followed a similar pattern of expression. The steady state level of MAG mRNA decreased to undetectable levels by 4 days of injury in the permanently transected nerve. After crush injury, re-expression of MAG to levels comparable to those of normal nerves preceded that of P2 by 2 days and that of P0 and the MBPs by 3 weeks during axonal regeneration and remyelination. These results support the proposed roles for MAG in the formation of initial Schwann cell-axonal contact required for myelin assembly, for P2 in fatty acid transportant during myelination, and for P0 and the MBPs in the maintenance of the integrity and compactness of the myelin sheath. In addition, these results indicate that the expression of the myelin specific genes, P0 and MBP, is constitutive and that the level of myelin specific mRNAs is modulated by axonal contact and myelin assembly.

Original languageEnglish (US)
Pages (from-to)317-326
Number of pages10
JournalJournal of Neuroscience Research
Volume26
Issue number3
DOIs
StatePublished - 1990

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Myelin Sheath
Peripheral Nerves
Gene Expression
Wallerian Degeneration
Regeneration
Messenger RNA
Proteins
Schwann Cells
Wounds and Injuries
Sciatic Nerve
Genes
Fatty Acids
Maintenance

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Axonal modulation of myelin gene expression in the peripheral nerve. / LeBlanc, A. C.; Poduslo, J. F.

In: Journal of Neuroscience Research, Vol. 26, No. 3, 1990, p. 317-326.

Research output: Contribution to journalArticle

LeBlanc, A. C. ; Poduslo, J. F. / Axonal modulation of myelin gene expression in the peripheral nerve. In: Journal of Neuroscience Research. 1990 ; Vol. 26, No. 3. pp. 317-326.
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