The effects of tegaserod, a 5-HT4 receptor agonist, on gastric emptying in a murine model of diabetes mellitus

Michael D. Crowell, C. Mathis, V. A. Schettler, T. Yunus, B. E. Lacy

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

The C57BLKS/J db/db transgenic mouse is a model of diabetes mellitus that has been shown to have delayed gastric emptying. We assessed gastric emptying rates in C57BLKS/J mice, and determined the effects of tegaserod, a new selective 5-HT4 receptor partial agonist, on gastric emptying. Methods: Gastric emptying rates of a 20% glucose test meal were determined in 12-20-week-old female db/db mice and control littermates. The effects of tegaserod (0.1-2.0 mg kg-1, i.p.) on gastric transit were tested in a second group of db/db mice. Pretreatment with GR11308, a specific 5-HT 4 antagonist, was used to confirm the mechanism of action of tegaserod on gastric emptying. Results: Gastric emptying of glucose was significantly slower in db/db mice than in control littermates. Tegaserod (0.1 mg kg-1) significantly accelerated the gastric emptying rate of glucose in db/db mice, reducing the fraction of the meal remaining in the stomach at 30 min by 80%. GR11308 blocked the gastrokinetic effects of tegaserod. Conclusions: Gastric emptying was impaired in db/db mice. Low dose tegaserod improved gastric emptying rates in this model of gastroparesis through the activation of 5-HT4 receptors. These findings suggest that 5-HT4 receptor agonists may prove useful for improving delayed gastric emptying in gastroparesis.

Original languageEnglish (US)
Pages (from-to)738-743
Number of pages6
JournalNeurogastroenterology and Motility
Volume17
Issue number5
DOIs
StatePublished - Oct 2005

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Keywords

  • Diabetes mellitus
  • Gastroparesis
  • Serotonin type-4 receptor agonist
  • Tegaserod

ASJC Scopus subject areas

  • Physiology
  • Gastroenterology
  • Neuroscience(all)

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