3-Acetylpyridine results in degeneration of the extrapyramidal and cerebellar motor systems: loss of the dorsolateral striatal dopamine innervation
Abstract
3-Acetylpyridine (3-AP) administration to rats results in degeneration of the dopamine (DA) innervation of the striatum as well as degeneration of the olivocerebellar system. We now report that administration of this pyridine neurotoxin results in a decrease in striatal DA concentration which is restricted to the dorsolateral aspects of the caudatoputamen. 3-AP treatment did not alter DA levels in the ventromedial striatum, the nucleus accumbens, or the anteromedial prefrontal cortex. Both 3-AP and another pyridine neurotoxin, 1-methyl-4-phenyl-1,2,3, 6-tetrahydropyridine (MPTP), potently inhibited in vitro MAOB activity and in contrast weakly inhibited MAOA activity. However, in vitro inhibition of MAOB by the selective inhibitor deprenyl did not prevent or attenuate 3-AP-induced striatal DA depletion. These data indicate that 3-AP administration to rats not only results in degeneration of the olivocerebellar system, but also effects degeneration of the DA innervation of the dorsolateral striatum, the striatal sector thought to subserve motoric and sensorimotor function. 3-AP-induced nigrostriatal degeneration differs from that elicited by MPTP in that the former is not prevented by deprenyl pretreatment. The 3-AP-induced dege...Continue Reading
References
Permanent human parkinsonism due to 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP): seven cases
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