Effect of selegiline on dopamine concentration
in the striatum of a primate
by
Kaseda S, Nomoto M, Iwata S
Department of Pharmacology,
Kagoshima University School of Medicine,
Japan.
ksds@med1.kufm.kagoshima-u.ac.jp
Brain Res 1999 Jan 2; 815(1):44-50

ABSTRACT

Monoamine oxidase (MAO) has two subtypes, A and B, that have different distributions between the rodent and the human. In the striatum, dopamine (DA) of the rat seems to be metabolized by MAO A, and DA of the human is largely deaminated by MAO B. MAO in the striatum of common marmosets is also type B. Using in vivo microdialysis, we investigated the pharmacological activity of selegiline, a selective irreversible inhibitor of MAO B, in the striatum of marmosets. Intraperitoneal co-administration of selegiline (1 mg kg-1, i.p.) with levodopa/carbidopa (10/2.5 mg kg-1, i.p.) did not significantly increase extracellular concentration of DA in the striatum of common marmosets compared with control animals receiving levodopa/carbidopa alone. Daily pretreatment with 0.1 mg kg-1 (i.p.) selegiline for two weeks, however, dramatically increased extracellular concentration of DA to about seven times that of control animals treated with levodopa/carbidopa alone in marmosets. Such an increase in extracellular concentrations of DA could not be observed in a similar study with Wistar rats. This study showed that chronic administration of a small dose of selegiline caused a marked increase in extracellular DA concentration in the striatum of primates, but not in the rodents.

Dopamine
Metabolites
Interactions
Desmethylselegiline
Selegiline and nitric oxide
Selegiline / neuroprotection
Selegiline and life-expectancy
Selegiline for longer-lived flies
Selegiline as an immunostimulant
Selegiline for cocaine-dependence
Selegiline, growth hormone and rats

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