The Interstrain Differences in the Effects of D-Amphetamine and Raclopride on Dorsal Striatum Dopaminergic System in KM and Wistar Rats (Microdialysis Study)

The Interstrain Differences in the Effects of D-Amphetamine and Raclopride on Dorsal Striatum... The levels of dopamine (DA) was determined by intracerebral microdialysis in vivo in KM rats selected for high audiogenic epilepsy, and in Wistar rats selected for nonsusceptibility to loud sound. The basal level of dopamine was 25% higher in the KM rats (P < 0.05). A single amphetamine injection (1 mg/kg body weight, intraperitoneously) caused a significant increase in the DA basal level up to 250-260% in animals of both genotypes. However, in Wistar rats, the level of DA reached maximum as soon as 20 min after amphetamine administration, whereas in KM rats, this happened only after 120 min. After a single injection of the D2/D3 dopamine receptor antagonist raclopride (1.2 mg/kg of body weight, intraperitoneously), an increase in the level of DA was similar in amplitude in rats of both genotypes (up to about 210%); however, this occurred 20-30 and 100 min after raclopride administration to Wistar and KM rats, respectively. This evidence suggests that the genetic defect of KM rats, namely, the high level of audiogenic epilepsy, is caused by abnormalities of the neurotransmitter brain systems and presumably accompanied by the regulatory gene dysfunction. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Genetics Springer Journals

The Interstrain Differences in the Effects of D-Amphetamine and Raclopride on Dorsal Striatum Dopaminergic System in KM and Wistar Rats (Microdialysis Study)

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Publisher
Springer Journals
Copyright
Copyright © 2004 by MAIK “Nauka/Interperiodica”
Subject
Biomedicine; Human Genetics
ISSN
1022-7954
eISSN
1608-3369
D.O.I.
10.1023/B:RUGE.0000033318.86523.59
Publisher site
See Article on Publisher Site

Abstract

The levels of dopamine (DA) was determined by intracerebral microdialysis in vivo in KM rats selected for high audiogenic epilepsy, and in Wistar rats selected for nonsusceptibility to loud sound. The basal level of dopamine was 25% higher in the KM rats (P < 0.05). A single amphetamine injection (1 mg/kg body weight, intraperitoneously) caused a significant increase in the DA basal level up to 250-260% in animals of both genotypes. However, in Wistar rats, the level of DA reached maximum as soon as 20 min after amphetamine administration, whereas in KM rats, this happened only after 120 min. After a single injection of the D2/D3 dopamine receptor antagonist raclopride (1.2 mg/kg of body weight, intraperitoneously), an increase in the level of DA was similar in amplitude in rats of both genotypes (up to about 210%); however, this occurred 20-30 and 100 min after raclopride administration to Wistar and KM rats, respectively. This evidence suggests that the genetic defect of KM rats, namely, the high level of audiogenic epilepsy, is caused by abnormalities of the neurotransmitter brain systems and presumably accompanied by the regulatory gene dysfunction.

Journal

Russian Journal of GeneticsSpringer Journals

Published: Oct 18, 2004

References

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