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mRNA expression of KIF1A, KIF1B, KIF2, KIF3A, KIF3B, KIF4, KIF5, and cytoplasmic dynein during axonal regeneration

R Takemura, T Nakata, Y Okada, H Yamazaki, Z Zhang and N Hirokawa
Journal of Neuroscience 1 January 1996, 16 (1) 31-35; DOI: https://doi.org/10.1523/JNEUROSCI.16-01-00031.1996
R Takemura
Department of Anatomy and Cell Biology, School of Medicine, University of Tokyo, Japan.
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T Nakata
Department of Anatomy and Cell Biology, School of Medicine, University of Tokyo, Japan.
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Y Okada
Department of Anatomy and Cell Biology, School of Medicine, University of Tokyo, Japan.
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H Yamazaki
Department of Anatomy and Cell Biology, School of Medicine, University of Tokyo, Japan.
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Z Zhang
Department of Anatomy and Cell Biology, School of Medicine, University of Tokyo, Japan.
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N Hirokawa
Department of Anatomy and Cell Biology, School of Medicine, University of Tokyo, Japan.
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Abstract

Mouse brain expresses multiple kinesin superfamily proteins (KIFs), which are involved in vesicle transport. The expression of KIFs is developmentally regulated, and both the mRNA and proteins of KIF2 and KIF4 are expressed abundantly in the juvenile brain. To elucidate the role of individual kinesin superfamily motor proteins during regenerative outgrowth of axons, we examined the mRNA expression of KIF1A, KIF1B, KIF2, KIF3A, KIF3B, KIF4, and KIF5 in adult mouse dorsal root ganglion cells after sciatic nerve crush. Seven to fourteen days after the nerve crush, the mRNA expression pattern of neurofilament and beta-tubulin isotypes suggested that the regenerative outgrowth of axons was active. At these stages, levels of mRNA for KIF1A, KIF1B, KIF2, KIF3A, KIF3B, KIF4, and KIF5 were 50.80% of control. The levels of mRNA for KIF4, which are detected in juvenile brain but not in the adult, were under the detection limit in both control and regenerating dorsal root ganglion cells. Because mRNA of neither KIF2 nor KIF4 increased significantly, the results suggest that the gene expression of KIFs during regeneration does not recapitulate the embryonic development and support the hypothesis that different series of events take place during the regenerative and embryonic outgrowths of axons. In contrast, mRNA for cytoplasmic dynein was slightly increased, up to 140%. This is consistent with the hypothesis that retrograde transport plays critical roles in regeneration such as the transport of neurotrophic factors.

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The Journal of Neuroscience: 16 (1)
Journal of Neuroscience
Vol. 16, Issue 1
1 Jan 1996
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mRNA expression of KIF1A, KIF1B, KIF2, KIF3A, KIF3B, KIF4, KIF5, and cytoplasmic dynein during axonal regeneration
R Takemura, T Nakata, Y Okada, H Yamazaki, Z Zhang, N Hirokawa
Journal of Neuroscience 1 January 1996, 16 (1) 31-35; DOI: 10.1523/JNEUROSCI.16-01-00031.1996

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mRNA expression of KIF1A, KIF1B, KIF2, KIF3A, KIF3B, KIF4, KIF5, and cytoplasmic dynein during axonal regeneration
R Takemura, T Nakata, Y Okada, H Yamazaki, Z Zhang, N Hirokawa
Journal of Neuroscience 1 January 1996, 16 (1) 31-35; DOI: 10.1523/JNEUROSCI.16-01-00031.1996
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