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Intrathecal noradrenaline restores 5-methoxy-N,N-dimethyltryptamine induced antinociception abolished by intrathecal 6-hydroxydopamine

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Summary

Intrathecal administration of 6-hydroxydopamine (6-OHDA) abolished the antinociceptive effects of acute administration of 5-methoxy-N,N-dimethyltryptamine (5-MeODMT, 1 mg/kg, s.c.) in the hot-plate, tail-flick and shock titration tests of nociception. The antinociceptive effects of 5-MeODMT, abolished by the prior intrathecal 6-OHDA treatment, were restored by intrathecal administration (2 or 1 μg) of noradrenaline (NA), immediately prior to 5-MeODMT, in all three tests of nociception. Biochemical analysis confirmed severe NA depletions (95 percent loss) in the lumbar and thoracic regions of the spinal and much lesser dopamine depletions (25–35 percent loss). Intrathecal 5,7-dihydroxytryptamine (5,7-DHT) attenuated 5-MeODMT induced antinociception in the tail-flick test and combined NA+5-Me ODMT induced antinociception in the hot-plate and tail-flick tests. Intrathecal administration of 5,7-DHT caused a severe depletion of 5-hydroxytryptamine in the lumbar region of the spinal cord. The present findings demonstrate further the modulatory role of NA upon serotonergic systems in nociception and indicate the necessity of NA availability for induction of 5-MeODMT analgesia.

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Author notes

  1. T. Archer

    Present address: Research and Developement Laboratories, Astra Läkemedel AB, Södertälje

Authors and Affiliations

  1. Research and Developement Laboratories, Astra Läkemedel AB, Södertälje

    B. G. Minor, Maj-Liz Persson & C. Post

  2. Department of Histology, Karolinska Institute, Stockholm, Sweden

    G. Jonsson

Authors
  1. B. G. Minor
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  2. Maj-Liz Persson
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  3. C. Post
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  4. G. Jonsson
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  5. T. Archer
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Minor, B.G., Persson, ML., Post, C. et al. Intrathecal noradrenaline restores 5-methoxy-N,N-dimethyltryptamine induced antinociception abolished by intrathecal 6-hydroxydopamine. J. Neural Transmission 72, 107–120 (1988). https://doi.org/10.1007/BF01250234

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  • DOI: https://doi.org/10.1007/BF01250234

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