Cdk5 activity is required for Purkinje cell dendritic growth in cell-autonomous and non-cell-autonomous manners

Bozong Xu, Ayumi Kumazawa, Shunsuke Kobayashi, Shin ichi Hisanaga, Takafumi Inoue, Toshio Ohshima

    Research output: Contribution to journalArticle

    Abstract

    Cyclin-dependent kinase 5 (Cdk5) is recognized as a unique member among other Cdks due to its versatile roles in many biochemical processes in the nervous system. The proper development of neuronal dendrites is required for the formation of complex neural networks providing the physiological basis of various neuronal functions. We previously reported that sparse dendrites were observed on cultured Cdk5-null Purkinje cells and Purkinje cells in Wnt1cre-mediated Cdk5 conditional knockout (KO) mice. In the present study, we generated L7cre-mediated p35; p39 double KO (L7cre-p35f/f; p39-/-) mice whose Cdk5 activity was eliminated specifically in Purkinje cells of the developing cerebellum. Consequently, these mice exhibited defective Purkinje cell migration, motor coordination deficiency and a Purkinje dendritic abnormality similar to what we have observed before, suggesting that dendritic growth of Purkinje cells was cell-autonomous in vivo. We found that mixed and overlay cultures of WT cerebellar cells rescued the dendritic deficits in Cdk5-null Purkinje cells, however, indicating that Purkinje cell dendritic development was also supported by non-cell-autonomous factors. We then again rescued these abnormalities in vitro by applying exogenous brain-derived neurotrophic factor (BDNF). Based on the results from culture experiments, we attempted to rescue the developmental defects of Purkinje cells in L7cre-p35f/f; p39-/- mice by using a TrkB agonist. We observed partial rescue of morphological defects of dendritic structures of Purkinje cells. These results suggest that Cdk5 activity is required for Purkinje cell dendritic growth in cell-autonomous and non-cell-autonomous manners.

    Original languageEnglish
    JournalDevelopmental Neurobiology
    DOIs
    Publication statusAccepted/In press - 2017

    Fingerprint

    Cyclin-Dependent Kinase 5
    Purkinje Cells
    Growth
    Null Lymphocytes
    Dendrites
    Biochemical Phenomena
    Brain-Derived Neurotrophic Factor
    Knockout Mice
    Dendritic Cells
    Cerebellum
    Nervous System
    Cell Movement

    Keywords

    • BDNF
    • Cdk5
    • Dendrite
    • Purkinje cell

    ASJC Scopus subject areas

    • Developmental Neuroscience
    • Cellular and Molecular Neuroscience

    Cite this

    Cdk5 activity is required for Purkinje cell dendritic growth in cell-autonomous and non-cell-autonomous manners. / Xu, Bozong; Kumazawa, Ayumi; Kobayashi, Shunsuke; Hisanaga, Shin ichi; Inoue, Takafumi; Ohshima, Toshio.

    In: Developmental Neurobiology, 2017.

    Research output: Contribution to journalArticle

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    AU - Hisanaga, Shin ichi

    AU - Inoue, Takafumi

    AU - Ohshima, Toshio

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