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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Dahan, L. Husum, H. Mnie-Filali, O. Arnt, J. Hertel, P. Haddjeri, N. |
| Description | Country affiliation: France Author Affiliation: Dahan L ( Laboratory of Neuropharmacology, Faculty of Pharmacy, University of Claude Bernard Lyon I, Lyon, France.) |
| Abstract | The atypical antipsychotic bifeprunox is a partial dopamine D(2) and 5-HT(1A) receptor agonist. Using in-vivo electrophysiological and behavioural paradigms in the rat, the effects of bifeprunox and aripiprazole were assessed on ventral tegmental area (VTA) dopamine and dorsal raphe serotonin (5-HT) cell activity and on foot shock-induced ultrasonic vocalisation (USV). In VTA, bifeprunox and aripiprazole decreased (by 20-50%) firing of dopamine neurons. Interestingly, bursting activity was markedly reduced (by 70-100%), bursting being associated with a larger synaptic dopamine release than single spike firing. Both ligands reduced inhibition of firing rate induced by the full dopamine receptor agonist apomorphine, whereas the D(2) receptor antagonist haloperidol prevented these inhibitory effects, confirming partial D(2)-like agonistic properties. On 5-HT neurons, bifeprunox was more potent than aripiprazole to suppress firing activity. The 5-HT(1A) receptor antagonist WAY-100,635 prevented their effects. In the USV test of anxiolytic-like activity, bifeprunox had higher potency than aripiprazole to reduce vocalisations. Both WAY-100,635 and haloperidol reversed the effects of both agonists. The present in-vivo study shows that bifeprunox is a potent partial D(2)-like and 5-HT(1A) receptor agonist reducing preferentially the phasic activity of dopamine neurons. Thus, bifeprunox would be expected to be an effective compound against positive and negative symptoms of schizophrenia. |
| File Format | HTM / HTML |
| ISSN | 02698811 |
| Issue Number | 2 |
| Volume Number | 23 |
| e-ISSN | 14617285 |
| Journal | Journal of Psychopharmacology |
| Language | English |
| Publisher | SAGE Publications |
| Publisher Date | 2009-03-01 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Pharmacology Anti-anxiety Agents Pharmacology Antipsychotic Agents Benzoxazoles Dopamine Metabolism Neurons Drug Effects Piperazines Quinolones Serotonin Animals Apomorphine Aripiprazole Dopamine D2 Receptor Antagonists Electroshock Haloperidol Male Pyridines Raphe Nuclei Rats Rats, Sprague-dawley Receptors, Dopamine D2 Agonists Serotonin 5-ht1 Receptor Agonists Serotonin 5-ht1 Receptor Antagonists Ultrasonics Ventral Tegmental Area Vocalization, Animal Physiology Comparative Study Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Pharmacology Pharmacology (medical) Psychiatry and Mental Health |
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