ISSN:
1365-2036
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Medicine
Notes:
Background : Although 5-HT3 antagonists have been used to treat chemotherapy-induced emesis and diarrhoea-predominant irritable bowel syndrome, the effects of 5-HT3 agonists in humans are unknown.Aim : To determine the effect of MKC-733, a selective 5-HT3 receptor agonist, on upper gastrointestinal motility.Methods : Oral MKC-733 (0.2, 1 and 4 mg) was compared with placebo in three randomized, double-blind, cross-over studies in healthy males. Antroduodenal manometry was recorded for 8 h during fasting and 3 h post-prandially (n = 12). Gastric emptying and small intestinal transit were determined by gamma-scintigraphy (n = 16). Gastric emptying, accommodation and antral motility were determined by echoplanar magnetic resonance imaging (n = 12).Results : MKC-733 (4 mg) increased the number of migrating motor complexes recorded in the antrum and duodenum (P 〈 0.001), but had no effect on post-prandial motility. MKC-733 delayed scintigraphically assessed liquid gastric emptying (P = 0.005) and accelerated small intestinal transit (P = 0.038). Echoplanar magnetic resonance imaging confirmed the delayed gastric emptying (P 〈 0.001) and demonstrated a significant increase in cross-sectional area of the proximal stomach (P 〈 0.01).Conclusions : MKC-733 delays liquid gastric emptying in association with relaxation of the proximal stomach, stimulates fasting antroduodenal migrating motor complex activity and accelerates small intestinal transit.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1046/j.1365-2036.2003.01797.x
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