Mice lacking dopamine D4 receptors are supersensitive to ethanol, cocaine, and methamphetamine.
The human dopamine D4 receptor (D4R) has received considerable attention because of its high affinity for the atypical antipsychotic clozapine and the unusually polymorphic nature of its gene. To clarify the in vivo role of the D4R, we produced and analyzed mutant mice (D4R-/-) lacking this protein. Although less active in open field tests, D4R-/- mice outperformed wild-type mice on the rotarod and displayed locomotor supersensitivity to ethanol, cocaine, and methamphetamine. Biochemical analyses revealed that dopamine synthesis and its conversion to DOPAC were elevated in the dorsal striatum from D4R-/- mice. Based on these findings, we propose that the D4R modulates normal, coordinated and drug-stimulated motor behaviors as well as the activity of nigrostriatal dopamine neurons.
Pubmed ID: 9323127 RIS Download
3,4-Dihydroxyphenylacetic Acid | Amino Acid Sequence | Animals | Antipsychotic Agents | Behavior, Animal | Central Nervous System Depressants | Clozapine | Cocaine | Corpus Striatum | Dopamine | Dopamine Agents | Ethanol | Genotype | Humans | Levodopa | Locomotion | Maternal Behavior | Methamphetamine | Mice | Mice, Knockout | Molecular Sequence Data | Motor Activity | Mutagenesis, Site-Directed | Narcotics | Nucleus Accumbens | Receptors, Dopamine D2 | Receptors, Dopamine D4 | Sensitivity and Specificity | Substantia Nigra | Transcription, Genetic