Volume 49, Issue 3 pp. 821-827
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Lack of Selectivity Between the Uptake of [3H] Adrenaline and [3H]Noradrenaline into Rat Hypothalamic Slices

C. Routledge

C. Routledge

Department of Physiology and Pharmacology, Nottingham University Medical School, Nottingham, England

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C. A. Marsden

Corresponding Author

C. A. Marsden

Department of Physiology and Pharmacology, Nottingham University Medical School, Nottingham, England

Address correspondence and reprint requests to Prof. C. A. Marsden at Department of Physiology and Pharmacology, Medical School, Queen's Medical Centre, Clifton Boulevard, Nottingham NG7 2UH, U.K.Search for more papers by this author
First published: September 1987
Citations: 4

The present address of Dr. C. Routledge is Syntex Research, 3401 Hillview Avenue, P.O. Box 10850, Palo Alto, CA 94303.

Abstract

Abstract: The uptake of [3H]adrenaline and [3H]- noradrenaline into rat hypothalamic slices was compared for determination of whether adrenaline uptake was independent of uptake into noradrenergic neurones. Kinetic analysis revealed a similar high-affinity uptake process for both adrenaline and noradrenaline, with Km and Vmax values within similar ranges. These uptakes were inhibited by desipramine and maprotiline in a dose-dependent manner, but the selective dopamine and 5-hydroxytryptamine up- take inhibitors benztropine and fluoxetine, respectively, were without effect. Competition for uptake sites by unlabelled adrenaline with [3H]adrenaline and [3H]- noradrenaline and by unlabelled noradrenaline with [3H] adrenaline and [3H]noradrenaline was very similar. Lesioning of the major adrenaline-containing cell group (C1 cell group) decreased the hypothalamic adrenaline concentration but had no effect on hypothalamic [3H]adrenaline or [3H]noradrenaline uptake. The results suggest that exogenous adrenaline is largely taken up by high-affinity sites on noradrenergic nerve terminals.

Abbreviations used:

  • 5-HT
  • 5-hydroxytryptamine
  • RVL
  • rostral ventral medulla
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