Summary
The present study has identified a receptor for 5-hydroxytryptamine (5-HT) which functions to inhibit the stimulus-induced release of [3H] noradrenaline following sympathetic periarterial nerve stimulation to the isolated perfused rat kidney. In addition to 5-HT (IC30=4.5×10−8 mol/l), both 5-carboxamidotryptamine (IC30=8×10−9 mol/l) and 5-methoxy-3-(1,2,3,6-tetrahydro-4-pyridinyl) indole (RU-24969, IC30=2.5×10−7 mol/l) acted as agonists whereas 8-hydroxy-2-(di-n-propylamino) tetralin (8-OH-DPAT) was inactive. The inhibitory effect of 5-HT on the electrically-evoked release of tritium was antagonized in a concentration-dependent manner by methiothepin (IC50=4×10−9 mol/l), metergoline (IC50=4×10−8 mol/l) and methysergide (IC50=1.3×10−7 mol/l) but not by cyproheptadine, ketanserin, mesulergine, (−)-propranolol, (±)-pindolol, (±)-cyanopindolol, metoclopramide or phentolamine. It is concluded that the receptor to 5-HT conforms to general criteria defining 5-HT1-like receptors but at the present time the receptor site cannot be fitted to the designated 5-HT1A, 5-HT1B or 5-HT1C subtypes.
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Preliminary accounts of this work were presented to the British Pharmacological Society in London (December, 1984) and Southampton (July, 1985)
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Charlton, K.G., Bond, R.A. & Clarke, D.E. An inhibitory prejunctional 5-HT1-like receptor in the isolated perfused rat kidney. Naunyn-Schmiedeberg's Arch. Pharmacol. 332, 8–15 (1986). https://doi.org/10.1007/BF00633190
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DOI: https://doi.org/10.1007/BF00633190