Augmentation of methamphetamine-induced behaviors in transgenic mice lacking the trace amine-associated receptor 1
| Autor: | Laurie J. Lynch, Katherine A. Sullivan, Cindy Achat-Mendes, Gregory M. Miller, Eric J. Vallender |
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| Rok vydání: | 2011 |
| Předmět: |
Genetically modified mouse
Male Clinical Biochemistry Mice Transgenic Pharmacology Motor Activity Toxicology Biochemistry Article Methamphetamine Receptors G-Protein-Coupled Behavioral Neuroscience Mice Dopamine TAAR1 Conditioning Psychological medicine Animals Amphetamine Biological Psychiatry Mice Knockout Dose-Response Relationship Drug Chemistry MDMA Extinction (psychology) Conditioned place preference Mice Inbred C57BL medicine.drug |
| Zdroj: | Pharmacology, biochemistry, and behavior. 101(2) |
| ISSN: | 1873-5177 |
| Popis: | The trace amine-associated receptor 1 (TAAR1) is a G protein-coupled receptor that is functionally activated by amphetamine-based psychostimulants, including amphetamine, methamphetamine and MDMA. Previous studies have shown that in transgenic mice lacking the TAAR1 gene (TAAR1 knockout; KO) a single injection of amphetamine can produce enhanced behavioral responses compared to responses evoked in wild-type (WT) mice. Further, the psychostimulant effects of cocaine can be diminished by selective activation of TAAR1. These findings suggest that TAAR1 might be implicated in the rewarding properties of psychostimulants. To investigate the role of TAAR1 in the rewarding effects of drugs of abuse, the psychomotor stimulating effects of amphetamine and methamphetamine and the conditioned rewarding effects of methamphetamine and morphine were compared between WT and TAAR1 KO mice. In locomotor activity studies, both single and repeated exposure to d-amphetamine or methamphetamine generated significantly higher levels of total distance travelled in TAAR1 KO mice compared to WT mice. In conditioned place preference (CPP) studies, TAAR1 KO mice acquired methamphetamine-induced CPP earlier than WT mice and retained CPP longer during extinction training. In orphine-induced CPP, both WT and KO genotypes displayed similar levels of CPP. Results from locomotor activity studies suggest that TAAR1 may have a modulatory role in the behavioral sensitization to amphetamine-based psychostimulants. That methamphetamine- but not morphine-induced CPP was augmented in TAAR1 KO mice suggests a selective role of TAAR1 in the conditioned reinforcing effects of methamphetamine. Collectively, these findings provide support for a regulatory role of TAAR1 in methamphetamine signaling. |
| Databáze: | OpenAIRE |
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