ISSN:
1435-1463
Keywords:
Substituted amphetamines
;
PCA (p-chloroamphetamine)
;
MDMA (3,4-methylenedioxymethamphetamine)
;
serotonin
;
tryptophan hydroxylase
;
paroxetine binding
;
5-HT transporter density
;
neurotoxicity
;
strain differences
;
rat
;
cortex
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary Substituted amphetamines are known to selectively destroy serotonin (5-HT) nerve endings in distant projection fields of the dorsal raphe nuclei and the systemic administration of these drugs is widely used in investigations of the role of the central 5-HT system and of the mechanisms involved in their toxicity. Until now Sprague-Dawley rats were almost exclusively used for this purpose and the findings were thought to apply to other strains as well. We compared the long-term effects of the administration of different doses of para-chloroamphetamine (PCA) on three specific markers of the density of 5-HT presynapses, [3H]-paroxetine binding to 5-HT-transporters, tryptophan hydroxylase apoenzyme contents, and 5-HT levels in the frontal cortex of Sprague-Dawley and Wistar rats. PCA-treatment caused a dose dependent decline of all three parameters which was much more pronounced in Sprague-Dawley compared to Wistar rats. An i.p. dose of 4mg PCA/kg body weight, which caused a severe, about 90% reduction of all three parameters of 5-HT innervation in Sprague-Dawley rats was almost ineffective in Wistar rats. The dose of 8mg/kg which was required to eliminate about 80% of cortical 5-HT presynapses in Wistar rats was already lethal to Sprague-Dawley rats. The reasons of this different susceptibility of the 5-HT system in the two rat strains are unknown. Their elucidation will contribute to a better understanding of inherited differences in individual vulnerability to the neurotoxic effects of substituted amphetamines. The combined measurements of transporter density, of tryptophan hydroxylase apoenzyme contents, and of 5-HT levels is a powerful tool for the assessment of experimentally induced changes in the density of 5-HT innervation in distant projection fields of the raphe nuclei.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01271252
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