Type III intermediate filament peripherin inhibits neuritogenesis in type II spiral ganglion neurons in vitro

NEUROSCIENCE LETTERS

卷:478

Article

Barclay, Meagan³  Julien, Jean-Pierre⁴  Ryan, Allen F.^5,6,7  Housley, Gary D.^1,2,3 

[1] Univ New S Wales, Sch Med Sci, Translat Neurosci Facil, Sydney, NSW 2052, Australia

[2] Univ New S Wales, Sch Med Sci, Dept Physiol, Sydney, NSW 2052, Australia

[3] Univ Auckland, Dept Physiol, Auckland, New Zealand

[4] Univ Laval, Dept Anat & Physiol, Quebec City, PQ, Canada

[5] Univ Calif San Diego, Dept Surg, La Jolla, CA 92093 USA

[6] Univ Calif San Diego, Dept Neurosci, La Jolla, CA 92093 USA

[7] VA Med Ctr, La Jolla, CA USA

关键词: Cochlea;    Spiral ganglion neuron;    Unmyelinated;    Neurite outgrowth;    Neuritogenesis;    BDNF;   

DOI  :  10.1016/j.neulet.2010.01.063

来源: Elsevier

【 摘 要 】

Peripherin, a type III intermediate filament protein, forms part of the cytoskeleton in a subset of neurons, most of which have peripheral fibre projections. Studies suggest a role for peripherin in axon outgrowth and regeneration, but evidence for this in sensory and brain tissues is limited. The exclusive expression of peripherin in a sub-population of primary auditory neurons, the type II spiral ganglion neurons (SGN) prompted our investigation of the effect of peripherin gene deletion (pphKO) on these neurons. We used confocal immunofluorescence to examine the establishment of the innervation of the cochlear outer hair cells by the type II SGN neurites in vivo and in vitro, in wildtype (WT) and pphKO mice, in the first postnatal week. The distribution of the type II SGN nerve fibres was normal in pphKO cochleae. However, using P1 spiral ganglion explants under culture conditions where the majority of neurites were derived from type II SGN, pphKO resulted in increased numbers of neurites/explant compared to WT controls. Type II SGN neurites from pphKO explants extended similar to double the distance of WT neurites, and had reduced complexity based on greater distance between turning points. Addition of brain-derived neurotrophic factor (BDNF) to the culture media increased neurite number in WT and KO explants similar to 30-fold, but did not affect neurite length or distance between turning. These results indicate that peripherin may interact with other cytoskeletal elements to regulate outgrowth of the peripheral neurites of type II SGN, distinguishing these neurons from the type I SGN innervating the inner hair cells. (C) 2010 Elsevier Ireland Ltd. All rights reserved.

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