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In this study, we have investigated the effects of artemin (ARTN), one of the glial cell line-derived neurotrophic factor (GDNF) family of neurotrophic factors, on C-fibres following nerve injury in the adult rat. GDNF family receptor alpha (GFRalpha) 3, the ligand binding domain of the ARTN receptor, is expressed in 34% of dorsal root ganglion (DRG) cells, predominantly in the peptidergic population of C-fibres and in a proportion of the isolectin B4 (IB4)-binding population. Interestingly, only 30% of GFRalpha3-expressing DRG cells co-expressed RET (the signal transducing domain). In agreement with previous studies, treatment with ARTN prevented many of the nerve injury-induced changes in the histochemistry of both the peptidergic and the IB4-binding populations of small, but not large, diameter DRG cells. In addition, ARTN treatment maintained C-fibre conduction velocity, and C-fibre evoked substance P release within the dorsal horn following nerve injury. ARTN was also protective following capsaicin treatment, which produces selective C-fibre injury. Given the potent neurotrophic actions of ARTN on C-fibres, it may therefore provide potential for the treatment of nerve injury, particularly in the maintenance of small fibre function.

Original publication

DOI

10.1111/j.1529-8027.2006.00106.x

Type

Journal article

Journal

J Peripher Nerv Syst

Publication Date

12/2006

Volume

11

Pages

330 - 345

Keywords

Animals, Axotomy, Cells, Cultured, Ganglia, Spinal, Glial Cell Line-Derived Neurotrophic Factor Receptors, Humans, Image Processing, Computer-Assisted, Immunohistochemistry, In Situ Hybridization, Mice, Nerve Regeneration, Nerve Tissue Proteins, Neural Conduction, Neurons, Afferent, Neuroprotective Agents, Rats, Recombinant Proteins, Substance P