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Catecholamine and MHPG plasma levels, platelet MAO activity, and3H-imipramine binding in heroin and cocaine addicts

  • Proceedings of the Symposium Cellular and Molecular Mechanisms of Drugs of Abuse Cocaine and Methamphetamine held in Nice, France, August 19–20, 1993
  • Published:
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Abstract

This work evaluated in a population of heroin and heroin plus cocaine human addicts:

  1. 1.

    Norepinephrine (NE), epinephrine (Epi), and 3-methoxy-4-hydroxyphenylglycol (MHPG) (the principal metabolite of brain NE) plasma levels;

  2. 2.

    Monoamine oxidase (MAO) activity; and

  3. 3.

    3H-imipramine specific binding to the amine carrier in platelets.

NE plasma levels were significantly lower in the short-term heroin user groups (1–3 and 4–6 yr), a finding not observed in both the long-term heroin user (>6 yr) and heroin plus cocaine user (>6 yr) groups. Epi levels changed in a similar manner, except that a significant increase was noted in heroin plus cocaine abusers. Conversely, dopamine and MHPG plasma levels increased with the duration of heroin use, and even more with cocaine abuse. Platelet MAO activity increased in all groups. Specific3H-imipramine binding sites showed an increase after 3 yr of heroin abuse and in all heroin plus cocaine addicts. In conclusion, short-term use of heroin decreases NE or Epi release, but with prolonged use, a slow adpatation occurs. In contrast, cocaine inhibits the neuronal Epi uptake, even in a situation of long duration of abuse. Probably the amine levels additionally regulate the amine carrier, resulting in changes that show a different pattern from major depression. These drugs of abuse may also influence directly or indirectly related enzymatic systems.

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Authors and Affiliations

  1. Institute of Pharmacology and Experimental Therapeutics, Faculty of Medicine, University of Coimbra, Coimbra, Portugal

    T. Macedo, C. A. Fontes Ribeiro, P. Tavares & M. T. Morgadinho

  2. Laboratory of Pharmacology, Faculty of Pharmacy, University of Coimbra, Coimbra, Portugal

    D. Cotrim & M. Caramona

  3. Centro de Apoio e Profilaxia da Droga, Coimbra, Portugal

    M. T. Nunes Vicente, L. Rodrigues, M. G. Cardoso & M. L. Keating

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  1. T. Macedo
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  2. C. A. Fontes Ribeiro
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  3. D. Cotrim
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  4. P. Tavares
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  5. M. T. Morgadinho
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  6. M. Caramona
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  7. M. T. Nunes Vicente
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  8. L. Rodrigues
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  9. M. G. Cardoso
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  10. M. L. Keating
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Macedo, T., Fontes Ribeiro, C.A., Cotrim, D. et al. Catecholamine and MHPG plasma levels, platelet MAO activity, and3H-imipramine binding in heroin and cocaine addicts. Mol Neurobiol 11, 21–29 (1995). https://doi.org/10.1007/BF02740681

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