Electropharmacograms of rasagiline, its metabolite aminoindan and selegiline in the freely moving rat.

Abstract:

BACKGROUND:Rasagiline and selegiline are classified as monoamine oxidase B (MAO-B) inhibitors. The present investigation deals with time-dependent electrical frequency changes (electropharmacograms) induced by these, as well as by aminoindan, the major metabolite of rasagiline. METHOD:Adult rats (day-night converted, >5 months old) were fitted with 4 bipolar concentric steel electrodes connected to a small base plate, which was positioned stereotactically for insertion of the electrodes into the frontal cortex, hippocampus, striatum and reticular formation. The plate carried a small plug to receive a telemetric device during the experimental session. Changes in field potentials were recorded during a pre-drug reference period of 45 min, followed by intraperitoneal administration and 5 h of recording thereafter. Data were transmitted wirelessly for frequency analysis. Data from 10 animals treated within a crossover design were averaged. RESULTS:A dose of 0.25 mg/kg i.p. rasagiline produced statistically significant decreases in spectral alpha2 and beta1 power. Higher dosages showed a linear enhancement of this effect. A similar pattern was obtained after administration of aminoindan (2-10 mg/kg), but of shorter duration. Selegiline produced a similar pattern only for the first 1-2 h. After this, statistically significant increases in delta and theta power were observed. CONCLUSION:Despite the feature of MAO-B inhibition in both drugs and its reflection in the initial changes of the frequency pattern during the first hour, the pharmacological action of selegiline during the following hours differs profoundly from that of rasagiline, presumably due to the toxicity of its major metabolites methamphetamine and amphetamine.

journal_name

Neuropsychobiology

journal_title

Neuropsychobiology

authors

Dimpfel W,Hoffmann JA

doi

10.1159/000319947

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

213-20

issue

4

eissn

0302-282X

issn

1423-0224

pii

000319947

journal_volume

62

pub_type

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