Atypical protein kinase C regulates primary dendrite specification of cerebellar Purkinje cells by localizing Golgi apparatus

Neurons have highly polarized structures that determine what parts of the soma elaborate the axon and dendrites. However, little is known about the mechanisms that establish neuronal polarity in vivo. Cerebellar Purkinje cells extend a single primary dendrite from the soma that ramifies into a highl...

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Bibliographic Details
Published in:The Journal of neuroscience 2010-12, Vol.30 (50), p.16983-16992
Main Authors: Tanabe, Koji, Kani, Shuichi, Shimizu, Takashi, Bae, Young-Ki, Abe, Takaya, Hibi, Masahiko
Format: Article
Language:English
Subjects:
Animals
Animals, Genetically Modified
Cerebellum - growth & development
Cerebellum - metabolism
Danio rerio
Dendrites - physiology
Freshwater
Golgi Apparatus - genetics
Golgi Apparatus - metabolism
Isoenzymes - genetics
Isoenzymes - physiology
Morphogenesis - genetics
Morphogenesis - physiology
Mutation
Protein Kinase C - genetics
Protein Kinase C - physiology
Purkinje Cells - cytology
Zebrafish
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Summary:Neurons have highly polarized structures that determine what parts of the soma elaborate the axon and dendrites. However, little is known about the mechanisms that establish neuronal polarity in vivo. Cerebellar Purkinje cells extend a single primary dendrite from the soma that ramifies into a highly branched dendritic arbor. We used the zebrafish cerebellum to investigate the mechanisms by which Purkinje cells acquire these characteristics. To examine dendritic morphogenesis in individual Purkinje cells, we marked the cell membrane using a Purkinje cell-specific promoter to drive membrane-targeted fluorescent proteins. We found that zebrafish Purkinje cells initially extend multiple neurites from the soma and subsequently retract all but one, which becomes the primary dendrite. In addition, the Golgi apparatus specifically locates to the root of the primary dendrite, and its localization is already established in immature Purkinje cells that have multiple neurites. Inhibiting secretory trafficking through the Golgi apparatus reduces dendritic growth, suggesting that the Golgi apparatus is involved in the dendritic morphogenesis. We also demonstrated that in a mutant of an atypical protein kinase C (aPKC), Prkci, Purkinje cells retain multiple primary dendrites and show disrupted localization of the Golgi apparatus. Furthermore, a mosaic inhibition of Prkci in Purkinje cells recapitulates the aPKC mutant phenotype. These results suggest that the aPKC cell autonomously controls the Golgi localization and thereby regulates the specification of the primary dendrite of Purkinje cells.
ISSN:0270-6474
1529-2401
DOI:10.1523/jneurosci.3352-10.2010