Excitatory amino acids differentially regulate the expression of GDNF, neurturin, and their receptors in the adult rat striatum

Experimental Neurology
Sònia MarcoJordi Alberch

Abstract

Glial cell line-derived neurotrophic factor (GDNF) family ligands are important regulators of neuronal development and maintenance of the connectivity in the basal ganglia and show neuroprotective activities in several paradigms of brain injury. The mRNAs of two members of this family, GDNF and neurturin, and also their receptors have been detected in the basal ganglia. In the present work, we analyzed the time course changes in the expression of these neurotrophic factors and receptors in the adult rat striatum, induced by quinolinate or kainate excitotoxicity. Our results show that stimulation of NMDA or non-NMDA receptors induced different effects on the mRNA levels analyzed. Expression of GDNF and its preferred receptor, GDNF family receptor-alpha1 (GFRalpha1), was transiently up-regulated by quinolinate and kainate, but with differing intensity and temporal pattern. Immunohistochemical analysis showed that, although GDNF and GFRalpha1 were initially localized in neurons, excitotoxicity induced the expression of these proteins in astrocyte-like cells. Neurturin mRNA levels were only up-regulated after quinolinate injection, whereas quinolinate or kainate injection did not modify GFRalpha2 mRNA. The mRNA for the common recep...Continue Reading

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