Neurochemical Research

, Volume 20, Issue 12, pp 1503–1510 | Cite as

Inhibition of MAO-B by (−)-deprenyl alters dopamine metabolism in the macaque (Macaca facicularis) brain

  • I. A. Paterson
  • B. A. Davis
  • D. A. Durden
  • A. V. Juorio
  • P. H. Yu
  • G. Ivy
  • W. Milgram
  • A. Mendonca
  • P. Wu
  • A. A. Boulton
Original Articles


The present study has examined whether MAO-B has a role in DA metabolism in the primate CNS in situ. Eleven macaques (macaca facicularis) were used in this study to examine the effects of (-)-deprenyl (1 mg/kg, i.v., 2 and 24 hours). (-)-Deprenyl administration completely and selectively blocked MAO-B activity and blocked DA metabolism in the caudate nucleus and frontal cortex. DA metabolism in the substantia nigra was not affected by MAO-B inhibition. Changes in DA metabolism were accompanied by changes in 5-hydroxytryptamine (5HT) turnover: 5-hydroxyindole acetic acid (5HIAA) levels increased in the caudate and decreased in the frontal cortex. Levels of 2-phenylethylamine (PE), a putative modulator of dopaminergic transmission, were increased by MAO-B inhibition in all three brain regions examined. It is concluded that in some regions of the primate brain, in contrast to the rat, MAO-B has an important role in DA metabolism.

Key Words

Monoamine oxidase dopamine phenylethylamine primate brain 


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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • I. A. Paterson
    • 1
  • B. A. Davis
    • 1
  • D. A. Durden
    • 1
  • A. V. Juorio
    • 1
  • P. H. Yu
    • 1
  • G. Ivy
    • 2
  • W. Milgram
    • 2
  • A. Mendonca
    • 3
  • P. Wu
    • 3
  • A. A. Boulton
    • 1
  1. 1.Neuropsychiatric Research UnitUniversity of SaskatchewanSaskatoonCanada
  2. 2.Department of PsychologyUniversity of TorontoCanada
  3. 3.Department of PhysiologyUniversity of TorontoCanada

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