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. 1993 Feb;108(2):436–442. doi: 10.1111/j.1476-5381.1993.tb12822.x

Characterization of 5-HT3 receptors of N1E-115 neuroblastoma cells by use of the influx of the organic cation [14C]-guanidinium.

H Bönisch 1, M Barann 1, J Graupner 1, M Göthert 1
PMCID: PMC1907979  PMID: 7680594

Abstract

1. The 5-HT3 receptor-mediated cation influx into N1E-115 mouse neuroblastoma cells has been studied by the use of the organic cation [14C]-guanidinium. 2. 5-Hydroxytryptamine (5-HT, 30 microM) caused a time-dependent influx of [14C]-guanidinium which, in contrast to the influx elicited by veratridine (100 microM), was not inhibited by tetrodotoxin (TTX, 10 microM). The 5-HT-induced influx was potentiated by substance P and inhibited by ondansetron. 3. 5-HT and the selective 5-HT3 receptor agonists, m-chloro-phenylbiguanide, phenylbiguanide and 2-methyl-5-HT caused bell-shaped concentration-response curves; the rank order of potency was m-chloro-phenylbiguanide > 5-HT > phenylbiguanide = 2-methyl-5-HT. Among these agonists, 5-HT elicited the highest influx of [14C]-guanidinium. 5-Methoxytryptamine, an agonist at 5-HT4 receptors, showed no effect. 4. The [14C]-guanidinium influx induced by 100 microM 5-HT was not affected by methysergide (10 microM) and ketanserin (10 microM) but was inhibited by 5-HT3 receptor antagonists with the following rank order of potency: ICS 205-930 > ondansetron > MDL 72222 >> metoclopramide. 5. The 5-HT-induced [14C]-guanidinium influx was increased in the absence of Ca2+ and/or Na+ and by a reduction of the temperature from 36 degrees to 20 degrees C. 6. Preincubation with 5-HT (100 microM) caused a time-dependent and rapidly reversible decrease of the 5-HT-induced [14C]-guanidinium influx. 7. It is concluded that [14C]-guanidinium influx measurement in N1E-115 cells is a convenient method to study properties of the cation channel of the 5-HT3 receptor.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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