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The carotid body is a neural crest-derived neuroendocrine organ that detects the oxygen level in blood and regulates ventilation. Unlike many other neural crest derivatives, the trophic factors mediating survival and differentiation of neuroendocrine cells of the carotid body are unknown. Given that many neural crest derivatives rely on the glial cell line-derived neurotrophic factor (GDNF) family of ligands (GFLs) for survival and function, we undertook an analysis of the carotid body as a potential site of GFL action. RET and GDNF family receptor alphas (GFRalpha) 1-3 are expressed in the developing carotid body as detected by RT-PCR and immunocytochemistry. mRNA for GDNF, and artemin (ARTN) were also present. In vitro, treatment with GDNF, neurturin (NRTN), or ARTN, individually or in combination, produced an increase in the number and length of processes of the Type-I glomus cells of the carotid body [embryonic day-17 (E17) rats]. However, GFLs alone or in combination had no effect on glomus cell survival in either postnatal day-1 (P1) or E17 carotid body cultures. These results suggest that one or more GFLs may have a role in carotid body function. In addition, the results of this study suggest that endogenous or exogenous GFLs may enhance target innervation by carotid body transplants.
Neurotrophic factors promote survival, proliferation and differentiation of neurons inducing intracellular signaling via specific receptors. The conventional biochemical methods often fail to reveal full repertoire of neurotrophic factor-receptor interactions because of their limited sensitivity. We evaluated several approaches to study signaling of Glial cell line-Derived Neurotrophic Factor (GDNF) family ligands and found that reporter-gene systems possess exceptionally high sensitivity and a heuristic power to identify novel biologically relevant growth factor-receptor interactions. We identified persephin, a GDNF family member, as a novel ligand for GFRalpha1/RET receptor complex. We confirmed this finding by several independent methods, including neurite outgrowth assay from the explants of sympathetic ganglia expressing Gfralpha1 and Ret mRNA but not persephin's conventional receptor GFRalpha4. As the activation of GFRalpha1/RET was shown to rescue dopaminergic neurons, our results suggest the potential of persephin for the treatment of Parkinson's disease.
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