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  • Time Sampling  (2)
  • Adipsia  (1)
  • Alpha-methyl-p-tyrosine  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 87 (1985), S. 328-333 
    ISSN: 1432-2072
    Keywords: Khat ; Cathinone ; Amphetamine ; Conditioned taste aversion ; Adipsia ; Toxicity ; Self-administration ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The potency of dl-cathinone (the active constituent of the Khat plant) was compared with that of d-amphetamine in the conditioned taste aversion (C. T. A.) procedure and in a test of drug-induced adipsia in rats. Both drugs induced C.T.A., the potency ratio being 1∶17 (amphetamine was more potent). Both drugs induced adipsia in deprived rats given access to water for 120 min. The potency ratio in this procedure was 1∶4. Potency in the C.T.A. procedure did not therefore correlate with potency in inducing adipsia; consequently drug-induced C.T.A. cannot be attributed to conditioned adipsia. In the adipsia test the drugs had similar durations of action, thus factors related to duration of drug action (cf Cappell and Le Blanc 1977) cannot account for the surprisingly low potency of cathinone in the C.T.A. procedure. These data, obtained with stimulant drugs with similar structures and similar actions in a variety of conventional in vivo and in vitro pharmacological tests, illustrate the unpredictable nature of drug actions in the C.T.A. procedure. The low potency of cathinone in inducing C.T.A. could not be predicted from knowledge of the potency of this compound in tests of adipsia (as shown here) or (as reported elsewhere) in tests of anorexia, locomotor stimulation, stereotypy, suppression of operant responding, drug discrimination, release and inhibition of reuptake of dopamine and noradrenaline, lethality and actions on the cardiovascular system. All of these studies have reported potency ratios considerably lower than 1∶17, which were nevertheless similar to the 1∶4 ratio observed in the adipsia test. It is suggested that the weak potency of cathinone in the C.T.A. procedure may be related to its comparatively potent reinforcing actions in the self-administration procedure.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 45 (1975), S. 119-123 
    ISSN: 1432-2072
    Keywords: Amphetamine ; Conditioned taste aversion ; Alpha-methyl-p-tyrosine ; Catecholamines ; Drug abuse ; Self administration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Pretreatment with alpha-methyl-p-tyrosine (AMPT) was found to block a conditioned taste aversion (C.T.A.) induced by injection of d-amphetamine sulphate (2.0 mg/kg per kg, i.p.) immediately after first access to 0.1% sodium saccharin. This finding implicates catecholaminergic systems in the induction of C.T.As by amphetamine, and suggests that the aversive properties of the drug are mediated by neurochemical systems which are similar to, or the same as, those which mediate the stimulant, anorectic and rewarding effects of the drug. The results refute a recent suggestion that the use of AMPT in the study of neurochemical mechanisms involved in drug induced taste aversions is precluded by the ability of AMPT itself to induce a C.T.A.; and illustrate an important distinction between pretreatment and post-treatment in taste aversion studies. The results provide further support for recent suggestions that the study of drug induced C.T.As may be of significance for an understanding of drug abuse.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 35 (1974), S. 1-12 
    ISSN: 1432-2072
    Keywords: Anorexiants ; Activity Analysis ; Time Sampling ; Screening Tests ; Phenylethylamines ; Serotonin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A series of eight experiments were conducted on the acute effects of a number of anorexic agents on rat exploratory behaviour, as assessed by a “time sampling” procedure of behavioural categorisation. Compounds studied were of three types. Firstly, some well known anorexiants (Amphetamine, Diethylpropion, Fenfluramine); secondly, a series of fenfluramine derivatives (Norfenfluramine, SE 780, SE 1513 and SKF 1-39728); and thirdly, an indole derivative (U 22-394A). All the compounds except the latter are based upon a phenylethylamine configuration. The results indicate that amphetamine and diethylpropion are stimulants whilst fenfluramine is a sedative, in accord with the clinical reports of the effects of acute administration of these compounds. All the other phenylethylamines and U 22-394A were found to be sedatives. The technique of activity analysis described here is a useful screening test for psychotropic agents which affect C.N.S. excitability in humans, which is probably superior to other measures of activity in its predictive value. However, it is noted that the effects of acute administration do not always provide a reliable index of chronic effects. The compounds SE 780 and SKF 1-39728 would seem to merit further study. It is suggested that all the fenfluramine derivatives, except SKF 1-39728, have a similar mode of anorexic action to U 22-394A.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 35 (1974), S. 13-17 
    ISSN: 1432-2072
    Keywords: Anorexia ; Time Sampling ; Fenfluramine ; SE 780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The behavioural and anorexic effects of the fenfluramine derivative “SE 780” in rats were studied after chronic administration over 35 days. Behavioural effects of the compound were assessed by “time sampling” behavioural categorisation, on days 1, 14 and 28 of administration. An initial sedative effect observed after acute administration was absent on days 14 and 28 of observation, when the drug had no behavioural effects at all. The anorexic properties of the drug were investigated in two ways. Firstly, by measuring daily body weights; and secondly by measuring intake of food over a 2 h period on observation days. The drug appeared to be a highly potent anorexiant in that tolerance to its effects built up very slowly. It is suggested that SE 780 may be an anorexic agent which is superior to Fenfluramine in two ways; firstly, it lacks stimulant properties after chronic administration, and secondly it is active over longer periods of time; as such it merits further study in humans.
    Type of Medium: Electronic Resource
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