title: Platelet monoamine oxidase B and plasma beta-phenylethylamine in Parkinson's disease.
abstract: OBJECTIVE
  To evaluate the correlation between changes in platelet monoamine oxidase type B (MAO-B) activity and plasma beta-phenylethylamine (PEA) concentrations in patients with Parkinson's disease and controls.
  
  
  METHODS
  Platelet MAO-B activity and plasma PEA were measured with gas chromatography-mass spectrometry (GC-MS) in patients with Parkinson's disease treated with levodopa (12 men and 12 women) or selegiline (three men and three women), and physically healthy subjects as a control group (10 men and 10 women).
  
  
  RESULTS
  Platelet MAO-B activity was significantly higher in the Parkinson's disease group (mean 542 (SD 318) pmol/10(7) platelets/30 min) than in the control group (mean 349 (SD 307) pmol/10(7) platelets/30 min) (p<0.05). By contrast, the plasma PEA concentrations in patients with Parkinson's disease were significantly lower than in the control group (mean 532 (SD 243) pg/ml; 931 (SD 560) pg/ml) (p<0.01). The plasma PEA concentrations in patients with Parkinson's disease treated with selegiline were prominently higher than in patients with no selegiline treatment (p<0.001). There was a significantly negative correlation between platelet MAO-B activity and plasma PEA concentrations in patients (n=24, r=-0.466, p<0.001).
  
  
  CONCLUSIONS
  The increase in platelet MAO-B activity and decrease in plasma PEA concentrations in patients with Parkinson's disease may be involved in the pathophysiological processes of the disease, and these changes are reversed by treatment with selegiline.
authors.affiliation: First Department (Neurology) of Internal Medicine, Kurume University School of Medicine, 67 Asahi-machi, Kurume, 830-0011, Japan.
authors.forename: G
authors.initials: G
authors.lastname: Zhou
authors.forename: Y
authors.initials: Y
authors.lastname: Miura
authors.forename: H
authors.initials: H
authors.lastname: Shoji
authors.forename: S
authors.initials: S
authors.lastname: Yamada
authors.forename: T
authors.initials: T
authors.lastname: Matsuishi
mesh_terms: D000368:Aged; D000704:Analysis of Variance; D001792:Blood Platelets / Q000378:metabolism*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008995:Monoamine Oxidase / Q000097:blood*; D010300:Parkinson Disease / Q000097:blood*; D010627:Phenethylamines / Q000097:blood*
chemical_list: D010627:Phenethylamines; C029261:phenethylamine; D008995:Monoamine Oxidase