The neurotoxic actions of 1-methyl-4-phenylpyridine (MPP+) are not prevented by deprenyl treatment.
1-Methyl-4-phenylpyridine (MPP+) injected into the cerebral ventricles (ICV) of mouse caused depletions of striatal dopamine (DA)(-42%), 3,4-dihydroxyphenylacetic acid (DOPAC) (-34%) and homovanillic acid (HVA) (-16%) content without significant reductions in levels of noradrenaline (NA), serotonin (5-HT) or 5-hydroxyindoleacetic acid (5-HIAA). When deprenyl was administered before MPP+, striatal DA and its metabolites were further depleted, and striatal NA and 5-HT levels also were reduced. Further, whilst ICV MPP+ alone failed to influence the biochemistry of the limbic areas (nucleus accumbens plus tuberculum olfactorium), in the presence of deprenyl MPP+ caused 20-40% reductions in levels of limbic NA, DA, DOPAC, HVA, 5-HT and 5-HIAA. Therefore, deprenyl treatment does not prevent the neurotoxic actions of MPP+; indeed, a more extensive neurotoxicity for MPP+ is revealed in the presence of this monoamine oxidase inhibitor.
Bradbury
A J
AJ
Costall
B
B
Jenner
P G
PG
Kelly
M E
ME
Marsden
C D
CD
Naylor
R J
RJ
D015655:1-Methyl-4-phenylpyridinium; D015102:3,4-Dihydroxyphenylacetic Acid / Q000032:analysis; D000818:Animals; D003342:Corpus Striatum / Q000032:analysis*; D005260:Female; D006719:Homovanillic Acid / Q000032:analysis; D006897:Hydroxyindoleacetic Acid / Q000032:analysis; D008032:Limbic System / Q000032:analysis*; D051379:Mice; D009043:Motor Activity / Q000187:drug effects; D018377:Neurotransmitter Agents / Q000032:analysis*; D009638:Norepinephrine / Q000032:analysis; D010302:Parkinson Disease, Secondary / Q000139:chemically induced*; D010627:Phenethylamines / Q000494:pharmacology*; D011726:Pyridinium Compounds / Q000037:antagonists & inhibitors*; D012642:Selegiline / Q000494:pharmacology*; D012701:Serotonin / Q000032:analysis
D018377:Neurotransmitter Agents; D010627:Phenethylamines; D011726:Pyridinium Compounds; D015102:3,4-Dihydroxyphenylacetic Acid; D012642:Selegiline; D012701:Serotonin; D006897:Hydroxyindoleacetic Acid; D015655:1-Methyl-4-phenylpyridinium; D009638:Norepinephrine; D006719:Homovanillic Acid