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  • 1995-1999  (4)
  • Dopamine  (2)
  • HIV  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Effects of dopamine and serotonin-releasing agents on methamphetamine discrimination and self-administration in rats (1999)
    Springer
    Psychopharmacology 141 (1999), S. 287-296 
    Details
    ISSN: 1432-2072
    Schlagwort(e): Key words Methamphetamine ; Dopamine ; Serotonin ; Phentermine ; Fenfluramine ; Drug-discrimination ; Self-administration ; Rat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  To analyze the involvement of dopamine (DA) and serotonin (5-HT) release in the stimulus properties of methamphetamine, two amphetamine analogs that selectively release either brain DA (phentermine) or 5-HT (fenfluramine) were tested for their ability to substitute for methamphetamine in rats discriminating methamphetamine (1.0 mg/kg) from saline. They were subsequently tested for their ability to alter IV methamphetamine (0.06 mg/kg per injection) self-administration in the same species when given as a pretreatment. The DA releaser phentermine, like methamphetamine itself, decreased methamphetamine self-administration (to 70% of baseline responding), but only at a dose of 3.0 mg/kg that fully generalized to the methamphetamine stimulus in the discrimination study. The 5-HT releaser fenfluramine attenuated methamphetamine self-administration to a much larger extent than phentermine (to 37% of baseline responding) at a dose of 1.8 mg/kg that did not generalize to methamphetamine and did not decrease rate of responding in the discrimination study. Tolerance developed to the inhibitory effect of 1.8 mg/kg fenfluramine on methamphetamine self-administration when it was given repeatedly over four consecutive daily sessions. The fenfluramine-induced decrease in methamphetamine self-administration was also attenuated when it was given together with the small 1.0 mg/kg dose of phentermine. These results suggest that DA release plays a dominant role in the discriminative stimulus effects of methamphetamine. However, stimulation of 5-HT release can strongly modify methamphetamine self-administration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002130050836
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  • 2
    Digitale Medien
    Digitale Medien
    Behavioural and neurochemical characteristics of phentermine and fenfluramine administered separately and as a mixture in rats (1997)
    Springer
    Psychopharmacology 131 (1997), S. 296-306 
    Details
    ISSN: 1432-2072
    Schlagwort(e): Key words Drug discrimination ; Microdialysis ; Dopamine ; Serotonin ; Phentermine ; Fenfluramine
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Clinical case studies suggest that combined administration of the serotonergic agent fenfluramine (FEN) and the weak amphetamine-like anorexic agent phentermine (PHEN) may be useful in the treatment of alcohol and cocaine addictions. The present experiment examined the nature of the interaction between the two agonists using the drug discrimination paradigm. In vivo microdialysis served to examine the neurochemical profile of dopamine and serotonin release in the nucleus accumbens. In conscious rats, acute injections of FEN (1.0–2.0 mg/kg IP) or PHEN (1.0–2.0 mg/kg IP) selectively elevated levels of serotonin and dopamine in the nucleus accumbens, respectively. A mixture (1 mg/kg of each) increased levels of both amines by similar magnitudes to those observed with each individually. Three groups of Sprague-Dawley rats were trained to discriminate (1) FEN (1.0 mg/kg IP) alone, (2) PHEN (1.0 mg/kg IP) alone or a mixture (3) PHEN+FEN (1 mg/kg of each, IP) from saline under a fixed ratio (FR-10) schedule of food reinforcement. Rats acquired the mixture discrimination rapidly, while for the other groups the training dose had to be increased to 2.0 mg/kg to attain stimulus control. The individual components of the mixture at the training dose generalized partially to the mixture, and complete generalisation was observed following 3.0 mg/kg FEN or PHEN. Rats trained to discriminate the individual components showed respective cross-generalisation profiles. Generalisation to cocaine (0.3–10.0 mg/kg IP), amphetamine (0.1–3.0 mg/kg IP) and nicotine (0.1–0.8 mg/kg SC) was greatest in the MIX-trained rats, while partial or no generalisation was observed in rats trained to discriminate the individual compounds. From the present results, it may be concluded that the two drugs given as a mixture do not produce a novel cue. Rather, these aminergics appear to interact additively. Furthermore, the dual stimulation of the amines by the mixture may be the basis for the cueing effects of the FEN+PHEN drug mixture, and its effectiveness in treating drug addictions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002130050296
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  • 3
    Digitale Medien
    Digitale Medien
    Cognitive Processing Style, Mood, and Immune Function Following HIV Seropositivity Notification (1997)
    Springer
    Cognitive therapy and research 21 (1997), S. 157-184 
    Details
    ISSN: 1573-2819
    Schlagwort(e): cognitive processing ; trauma ; mood ; HIV ; avoidance ; immunity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Psychologie
    Notizen: Abstract The relations among cognitive processing of stressful emotional material, mood, and immune functioning were examined in 30 asymptomatic gay men during the stress of HIV-1 seropositivity notification. We administered the Impact of Event Scale, and immunological and mood data were collected 5 weeks before, 1 week after, and 5 weeks after notification of HIV-1 seropositivity. Consistent elevations of avoidance or intrusion levels during the study period did not predict distress at 5 weeks postdiagnosis; rather, increased levels of both avoidance and intrusion over the study period were related to significantly greater anxiety, depression, and total mood disturbance by the end of the study. Increased intrusion, but not avoidance, during the period from study entry to 1-week postdiagnosis was related to higher levels of distress 1 week after HIV serostatus notification. In contrast, in the weeks following serostatus notification, increased avoidance predicted worse mood outcomes. Increased avoidance over the 10-week study period significantly predicted poorer proliferative response to pokeweed mitogen as well as trends toward lower T-helper-inducer lymphocyte (CD4+) percentages. Increased intrusion over this time period significantly predicted lower CD4+ percentages, controlling statistically for baselines. Mood change during the 10-week study did not mediate effects of cognitive processing on immune function. Mood changes may work jointly with cognitive processing to influence some immune outcomes. As increases in avoidant and intrusion processing may reflect difficulties in working through the trauma of HIV seropositivity notification, the current findings suggest the importance of thorough cognitive processing of traumatic medical information in this population for subsequent adjustment and immune functioning.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1021880612642
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  • 4
    Digitale Medien
    Digitale Medien
    Characteristics of African-Americans with multiple risk factors associated with HIV/AIDS (1996)
    Springer
    Journal of behavioral medicine 19 (1996), S. 55-71 
    Details
    ISSN: 1573-3521
    Schlagwort(e): African-Americans ; AIDS ; anger ; attitudes ; condom use ; HIV ; knowledge
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin , Psychologie
    Notizen: Abstract Multiple risk factors in young African-Americans have tremendous implications for the spread of AIDS. Two hundred forty-two heterosexual college students were classified as having low, moderate, or high risk for HIV infection based upon their self-reported sexual practices. Results indicated that subjects differed in AIDS knowledge and attitudes toward condoms with respect to both Gender and Risk level, with men and High Risk individuals being less knowledgeable and having more negative attitudes than their female and Low Risk counterparts respectively. Interaction effects revealed that High Risk men were less knowledgeable than both Low Risk men and High Risk women. High Risk men as well as High and Low Risk women reported more anger surrounding condom usage than Low Risk men. Low perceptions of vulnerability for AIDS were reflected in the entire sample. The implications of this study for primary prevention and future research are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01858174
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