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. 1995 Jan;114(2):558–562. doi: 10.1111/j.1476-5381.1995.tb13263.x

Differences between 5-HT3 receptor antagonists in modulation of visceral hypersensitivity.

S E Banner 1, G J Sanger 1
PMCID: PMC1510257  PMID: 7881756

Abstract

1. Noxious colo-rectal distension was applied in conscious rats by acute balloon inflation and the effects observed as abdominal muscle contraction with the threshold typically between 10-40 mmHg. The effects of 5-HT3 receptor antagonists on responses to noxious colo-rectal distension were then studied in both normal rats and those pretreated with 5-hydroxytryptophan (5-HTP). 2. Granisetron and ondansetron (10 micrograms kg-1 and 1 mg kg-1, s.c.) had no effect on visceromotor thresholds to colo-rectal distension in normal rats. 3. Hypersensitivity of the colo-rectum was achieved by systemic administration of a low dose of 5-HTP (10 mg kg-1, s.c.) which lowered the distension pressure required to induce the visceromotor reflex; analysis of variance showed a highly significant treatment effect (F1,11 = 84.26, P < 0.001). 4. Granisetron, zatosetron, bemesetron and renzapride equi-potently increased the threshold values at which distension evoked a visceromotor reflex after dosing with 5-HTP, with a maximal response 3.6 to 4.2 fold above saline controls, at 10 micrograms kg-1, s.c. Metoclopramide (10 micrograms kg-1) also raised the level of distension required to elicit a response. By comparison, tropisetron caused a small, non-significant increase in visceromotor threshold values and only at high doses (1 mg kg-1), whilst ondansetron and BRL 46470 had no significant effects at doses up to 10 mg kg-1. 5. The response to granisetron (10 micrograms kg-1, s.c.) in 5-HTP-treated rats was unaltered by pre-administration of naloxone (5 mg kg-1, s.c.).(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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