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Conditioned place aversion induced by 5-HT(1C) receptor antagonists
B. Rocha1, G. Di Scala, F. Jenck
1Laboratoire de Neurophysiologie et Biologie des Comportements, 5, rue Blaise Pascal F67084, Strasbourg, France.
Behavioural Pharmacology
|April 1, 1993
Summary
Serotonin receptor antagonists like mianserin and eltoprazine cause aversion in rats, suggesting 5-HT(1C) receptor blockade contributes to these effects. Ketanserin did not produce significant behavioral changes.
Area of Science:
- Neuroscience
- Pharmacology
- Behavioral Science
Background:
- Serotonin receptors play a crucial role in regulating mood and behavior.
- Understanding the specific roles of different serotonin receptor subtypes is essential for developing targeted therapeutics.
Purpose of the Study:
- To investigate the affective properties of non-selective serotonin receptor antagonists in rats.
- To determine the involvement of 5-HT(1C) and 5-HT(2) receptors in drug-induced behavioral effects.
Main Methods:
- A place-conditioning procedure was employed in rats.
- Rats were exposed to different serotonin receptor antagonists: mianserin, eltoprazine, and ketanserin.
- The effects of a selective 5-HT(1C) receptor agonist, mCPP, were also examined.
Main Results:
- Mianserin (a 5-HT(1C)/5-HT(2) antagonist) induced place aversion at the highest dose.
- Eltoprazine (a 5-HT(1B) agonist/5-HT(1C) antagonist) caused place aversion at tested doses.
- Ketanserin (a 5-HT(2) antagonist) did not produce significant place preference or aversion.
- mCPP administration prevented the aversive effects of mianserin and eltoprazine.
Conclusions:
- Acute blockade of 5-HT(1C) receptors appears to be involved in the aversive effects of mianserin and eltoprazine.
- Differential receptor affinities contribute to the distinct behavioral outcomes observed with these antagonists.
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