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  • 1
    Electronic Resource
    Electronic Resource
    The pharmacology of the behavioral and hypothermic responses of rats to 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT) (1987)
    Springer
    Psychopharmacology 91 (1987), S. 506-511 
    Details
    ISSN: 1432-2072
    Keywords: 8-OH-DPAT ; 5-Hydroxytryptamine (5-HT) ; 5-HT1 receptor ; Parachlorophenylalanine (PCPA) ; Clenbuterol ; Quipazine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The hypothermic and motor behavioural responses to 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT) have been investigated in the rat. The dose-effect relationship showed that hypothermia appeared at a lower dose than a definite motor syndrome. The hypothermic response to 8-OH-DPAT was attenuated following depletion of 5-hydroxytryptamine (5-HT) by repeated intraperitoneal (IP) administration of parachlorophenylalanine (200 mg/kg) or by injection of 5,7-dihydroxytryptamine (5,7-DHT, 100 μg) into the region of the third ventricle; the motor behavioural response produced simultaneously was not. Indeed, after 5,7-DHT, it was increased. Quipazine (1 mg/kg, IP) antagonised the hypothermic response and facilitated the motor behaviour. Clenbuterol (2.5 mg/kg, IP) increased both hypothermic and motor responses. (±)-propranolol was without effect on the simple hypermotility produced by 8-OH-DPAT, although it is known to antagonise the hypothermic and stereotyped motor responses. It is concluded that 8-OH-DPAT probably produces its hypothermic effects by actions at 5-HT receptors located presynaptically on 5-HT neurones, while the stereotyped components of the serotonin syndrome appear to be mediated by post-synaptic receptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00216019
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  • 2
    Electronic Resource
    Electronic Resource
    Attenuation by electroconvulsive shock and antidepressant drugs of the 5-HT1A receptor-mediated hypothermia and serotonin syndrome produced by 8-OH-DPAT in the rat (1987)
    Springer
    Psychopharmacology 91 (1987), S. 500-505 
    Details
    ISSN: 1432-2072
    Keywords: 5-Hydroxytryptamine (5-HT) ; 5-HT1A receptor ; Electroconvulsive shock ; Antidepressants ; 8-OH-DPAT ; Zimeldine ; Desipramine ; Tranylcypromine ; Flurazepam
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The hypothermia and motor behavioural syndrome produced in rats by injection of the 5-HT1A ligand 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT) has been studied following administration of electroconvulsive shock under halothane anaesthesia (ECS) and during the administration of antidepressant drugs. Repeated ECS attenuated the hypothermic response to 8-OH-DPAT (0.1 mg/kg SC) immediately after the last of five shocks given spread out over 10 days with a maximal effect 21 days after the final shock. A single ECS was without effect. The serotonin syndrome produced by 8-OH-DPAT (0.75 mg/kg SC) was also attenuated, although simple motility was increased. Zimeldine (20 mg/kg) and desipramine (20 mg/kg), when given once daily for 14 days also attenuated the hypothermia and the serotonin syndrome provoked by 8-OH-DPAT. The hypothermic response was somewhat reduced 24 h after a single injection of zimeldine but not 45 min after zimeldine (5 mg/kg IP). At a high dose (20 mg/kg) tranylcypromine clearly attenuated both responses 24 h after a single injection. Tranylcypromine (6 mg/kg IP) showed a smaller effect after a single injection but attenuated the behavioural syndrome on repeated administration. Repeated injection of flurazepam (10 mg/kg IP) was without effect on either the behavioural or hypothermic response to 8-OH-DPAT. These findings are consistent with the view that responses mediated via the 5-HT1A receptor may be involved in the mechanism of action of antidepressant treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00216018
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The enhancement by lithium of the 5-HT1A mediated serotonin syndrome produced by 8-OH-DPAT in the rat: evidence for a post-synaptic mechanism (1986)
    Springer
    Psychopharmacology 90 (1986), S. 488-493 
    Details
    ISSN: 1432-2072
    Keywords: Lithium ; 5-Hydroxytryptamine ; 5-HT1 receptor ; 8-OH-DPAT ; P-Chlorophenylanine ; 5-HT-mediated behaviour ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Administration of lithium chloride (10 mmol/kg on day 1 and 3 mmol/kg twice daily on subsequent days, SC) for 3–14 days enhances the components of the serotonin syndrome produced by 8-hydroxy-2-(di-propylamino)tetralin (8-OH-DPAT) in the rat. The hypothermic response produced simultaneously was unaltered. Following lithium administration for 3 days the motor response to 5-methoxy,N,N-dimethyltryptamine was also facilitated. These data suggest that lithium administration enhances post-synaptic 5-HT receptor-mediated behavioural responses. (−)-Propranolol (20 mg/kg, IP) but not (+)-propranolol (20 mg/kg IP) fully antagonised the facilitated response to 8-OH-DPAT seen following lithium administration; ritanserin (200 μg/kg, IP) was without effect. These findings favour a mechanism for the action of lithium involving the 5-HT1A receptor. Depletion of 5-hydroxytryptamine (5-HT) with parachlorophenylalanine (PCPA, 300 mg/kg, IP on day 1 and 2 of lithium administration) did not prevent the facilitation by lithium of the response to 8-OH-DPAT. These data strengthen the suggestion that lithium has its effect on 5-HT1A-mediated motor function by a post-synaptic action. By contrast, motor responses to the putative 5-HT1B receptor agonist 5-methoxy-3-(1,2,3,6-tetrahydro-pyridin-4-yl)-1H-indole (RU 24969) were unaltered by repeated lithium administration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00174066
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    Paper (German National Licenses)
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