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Chondroitin sulfate proteoglycan phosphacan associates with parallel fibers and modulates axonal extension and fasciculation of cerebellar granule cells.

Authors: Hayashi, N  Mizusaki, MJ  Kamei, K  Harada, S  Miyata, S 
Citation: Hayashi N, etal., Mol Cell Neurosci. 2005 Nov;30(3):364-77. Epub 2005 Sep 16.
Pubmed: (View Article at PubMed) PMID:16150606
DOI: Full-text: DOI:10.1016/j.mcn.2005.08.001

Phosphacan is a nervous system-specific chondroitin sulfate proteoglycan and one of the major components of extracellular matrix in the brain. In the present study, we examined its spatiotemporal expression, ultrastructural localization, binding manner, and in vitro analysis on cell adhesion, axonal extension, and fasciculation in rat cerebellum. The present light microscopic immunohistochemistry showed that phosphacan immunoreactivity was localized mainly at the molecular layer in the cerebellum, but not at the external granular layer. Further double labeling immunohistochemical and immunoelectron microscopic studies revealed that phosphacan was localized around parallel fibers, but not at synapses. The binding of phosphacan to membrane and/or extracellular matrix partly required Ca2+ and was mediated through its core glycoprotein. Phosphacan inhibited adhesion and axonal extension of cerebellar granule cells in dissociated culture, while it promoted axonal fasciculation of their aggregated culture. These results indicate that phosphacan around parallel fibers may be the repulsive substratum for adhesion and extension of granule cells and promote the fasciculation of parallel fibers.

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CRRD Object Information
CRRD ID: 9590115
Created: 2014-11-12
Species: All species
Last Modified: 2014-11-12
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.