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Alteration of shivering threshold in cold-and warm-adapted guinea pigs following intrahypothalamic injections of noradrenaline and of an adrenergic alpha-receptor blocking agent

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Summary

The role of adrenergic receptors in the central thermoregulatory pathways controlling the shivering activity has been studied in groups of cold-adapted (CA), warm-adapted (WA) and newborn (NB) guinea pigs, which show quantitative differences in shivering threshold. In the CA and NB animals, which normally start to shiver at lower mean body temperature levels than the WA controls, microinjection of noradrenaline (1 μg in 1 μl) into the noradrenaline-sensitive area of the anterior hypothalamus elicited shivering at higher body temperatures at which normally only WA animals start to shiver. Similar injections into the hypothalamus of WA animals did not induce any further shift of the shivering threshold. Microinjections of the alpha-receptor blocking agent phentolamine into the same brain area shifted the shivering threshold in all groups of animals to lower body temperatures, the shift being proportional to the injected dose of phentolamine. The CA and NB animals required higher doses of phentolamine to produce a change in shivering threshold. It is concluded that adrenergic alpha receptors are involved in the central thermoregulatory mechanisms which adjust the thresholds for the thermoregulatory reactions.

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Authors and Affiliations

  1. Zentrum für Physiologie der Justus Liebig-Universität Giessen, Aulweg 129, D-6300, Giessen, Germany

    Eugen Zeisberger & Kurt Brück

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  1. Eugen Zeisberger
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  2. Kurt Brück
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This study was supported by the Deutsche Forschungsgemeinschaft (SFB 122, Projekt B 1).

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Zeisberger, E., Brück, K. Alteration of shivering threshold in cold-and warm-adapted guinea pigs following intrahypothalamic injections of noradrenaline and of an adrenergic alpha-receptor blocking agent. Pflugers Arch. 362, 113–119 (1976). https://doi.org/10.1007/BF00583636

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  • DOI: https://doi.org/10.1007/BF00583636

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