Abstract
To investigate the role of the myelin-associated protein Nogo-A on axon sprouting and regeneration in the adult central nervous system (CNS), we generated Nogo-A-deficient mice. Nogo-A knockout (KO) mice were viable, fertile, and not obviously afflicted by major developmental or neurological disturbances. The shorter splice form Nogo-B was strongly upregulated in the CNS. The inhibitory effect of spinal cord extract for growing neurites was decreased in the KO mice. Two weeks following adult dorsal hemisection of the thoracic spinal cord, Nogo-A KO mice displayed more corticospinal tract (CST) fibers growing toward and into the lesion compared to their wild-type littermates. CST fibers caudal to the lesion-regenerating and/or sprouting from spared intact fibers-were also found to be more frequent in Nogo-A-deficient animals.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Alternative Splicing
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Animals
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Antigens, Surface / biosynthesis
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Behavior, Animal
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Brain / cytology
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Brain / metabolism
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Cell Count
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Cells, Cultured
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Fetal Viability / genetics
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Mice
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Mice, Inbred C57BL
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Mice, Knockout
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Myelin Proteins / deficiency*
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Myelin Proteins / genetics
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Myelin Proteins / metabolism
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Myelin Sheath / physiology
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Myelin Sheath / ultrastructure
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Nerve Fibers / physiology
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Nerve Fibers / ultrastructure
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Nerve Regeneration* / physiology
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Neuronal Plasticity* / physiology
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Nogo Proteins
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Oligodendroglia / cytology
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Oligodendroglia / metabolism
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Phenotype
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Protein Isoforms / deficiency
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Protein Isoforms / genetics
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Protein Isoforms / metabolism
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Rats
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Recovery of Function / physiology
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Spinal Cord / metabolism
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Spinal Cord / pathology
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Spinal Cord Injuries / genetics
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Spinal Cord Injuries / physiopathology*
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Up-Regulation
Substances
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Antigens, Surface
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Myelin Proteins
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Nogo Proteins
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Protein Isoforms
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Rtn4 protein, mouse
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Rtn4 protein, rat