Glial cell line-derived neurotrophic factor increases survival, growth and function of intrastriatal fetal nigral dopaminergic grafts

Neuroscience
C RosenbladA Björklund

Abstract

The ability of transplants of fetal nigral neurons to reverse symptoms in patients with Parkinson's disease is, at least in part, limited by the poor survival of the grafted dopaminergic neurons and the restricted host reinnervation from the graft. Here, we report that glial cell line-derived neurotrophic factor, a novel trophic factor for developing dopaminergic neurons, can increase survival and fibre outgrowth of fetal nigral dopaminergic neurons, and stimulate graft-induced functional recovery after transplantation in a rat model of Parkinson's disease. Injections of rat glial cell line-derived neurotrophic factor adjacent to the graft enhanced graft function, resulting in complete compensation of amphetamine-induced turning behaviour already by two weeks postgrafting as opposed to four weeks in the control group. The total number of surviving tyrosine hydroxylase-positive neurons was about two-fold greater in the glial cell line-derived neurotrophic factor-treated animals compared to the vehicle-injected controls, and the density of tyrosine hydroxylase-positive fibres was found to be increased both in the host striatum (from 37.6 +/- 8.3% to 105.5 +/- 9.7% of intact striatum) as well as inside the graft (55% increase). Mo...Continue Reading

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