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Comparative investigations on the actions of ACTH1–24, somatostatin, neurotensin, substance P and vasopressin on locus coeruleus neuronal activity in vitro

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Summary

A considerable number of neuropeptides have been localized immunohistochemically in the area of the locus coeruleus of the rat. The objective of this study was to assess the actions of some of these transmitter candidates on spontaneously active locus coeruleus neurons in vitro. The effects of bath-applied peptides on the discharge rate of individual locus coeruleus neurons were investigated. A midpontine slice preparation of the gerbil brain was used. Excitatory dose-dependent effects were found with four peptides with the following rank order of potency: Substance P, (Arg8)-vasopressin, neurotensin, ACTH1–24. Somatostatin hyperpolarized all neurons tested. Given the pronounced effects seen with substance P, somatostatin and vasopressin in the nanomolar range, it is conceivable that these peptides may have a role in regulating neuronal activity in locus coeruleus.

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Authors and Affiliations

  1. Pharmaceuticals Division, Ciba-Geigy Ltd., Biology Research Laboratories, CH-4002, Basel, Switzerland

    Hans Rudolf Olpe, Martin W. Steinmann & Mario F. Pozza

  2. Department of Physiology, University of Mainz, Saarstrasse 21, D-6500, Mainz, Federal Republic of Germany

    Helmut L. Haas

Authors
  1. Hans Rudolf Olpe
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  2. Martin W. Steinmann
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  3. Mario F. Pozza
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  4. Helmut L. Haas
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Olpe, H.R., Steinmann, M.W., Pozza, M.F. et al. Comparative investigations on the actions of ACTH1–24, somatostatin, neurotensin, substance P and vasopressin on locus coeruleus neuronal activity in vitro. Naunyn-Schmiedeberg's Arch Pharmacol 336, 434–437 (1987). https://doi.org/10.1007/BF00164879

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  • DOI: https://doi.org/10.1007/BF00164879

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