Dopamine differentiation factors produce partial motor recovery in 6-hydroxydopamine lesioned rats
- PMID: 8980004
- DOI: 10.1006/nbdi.1995.0001
Dopamine differentiation factors produce partial motor recovery in 6-hydroxydopamine lesioned rats
Abstract
Two-week infusion of muscle-derived differentiation factor (MDF), or human recombinant acidic fibroblast growth factor (aFGF) and/or its muscle-derived activating substance into the striatum of unilaterally 6-hydroxydopamine (6-OHDA)-lesioned rats caused a significant and long lasting (40 days) reduction (48-100%) in amphetamine-induced rotational asymmetry. In parallel with behavioural recovery, striatal tyrosine hydroxylase (TH) activity, dopamine (DA) and dihydroxy-phenyl-acetic acid (DOPAC) levels recovered in a dose-dependent manner in all treated rats when compared to controls. The greatest increments were observed in rats infused with aFGF and its activator. Increases in biochemical indices were not reflected in trophic changes of the dopamine system; thus, the number of TH-immunoreactive neurones and their striatal innervation were unmodified by treatment with MDF. In contrast with the lesioned brain, infusion of these agents into the intact brain produced no change in nigrostriatal dopamine biochemistry. Our results suggest that dopamine differentiation factors may be important in regulating the production of dopamine in the injured brain and, therefore, may be useful in the treatment of DA imbalances associated with certain neurological disorders such as Parkinson's disease.
Copyright 1995 Academic Press, Inc.
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