Intracerebroventricular glial cell line-derived neurotrophic factor improves motor function and supports nigrostriatal dopamine neurons in bilaterally 6-hydroxydopamine lesioned rats

Experimental Neurology
K E BowenkampP C Bickford

Abstract

In order to evaluate the efficacy of glial cell line-derived neurotrophic factor (GDNF) in a model of advanced Parkinson's disease, we studied rats with extensive bilateral lesions of the nigrostriatal pathway. Adult male F344 rats were injected bilaterally into the medial forebrain bundle with the neurotoxin 6-hydroxydopamine. Locomotor ability as measured by total distance traveled in an open field over 20 min, as well as von Frey hair testing of sensorimotor neglect, was monitored weekly. Rats demonstrating severe motor impairment and sensorimotor neglect were used for this study and were sorted to achieve similar average behavioral scores between the two treatment groups. After 2 weeks of pretesting, the rats received 250 microg GDNF or vehicle injected into the right lateral cerebral ventricle. Three weeks later, an additional 500 microg GDNF or vehicle was injected into the contralateral ventricle. The rats were monitored for another 2 weeks prior to sacrifice. Behavioral results indicated that von Frey hair scores were inconsistent between tests for each rat and were unchanged following GDNF treatment. However, GDNF recipients demonstrated significant improvement in locomotor ability compared to vehicle recipients. High-...Continue Reading

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