Lipopolysaccharide temporarily impairs sphincter of Oddi motility

Joseph J. Cullen, Hyojin Park, Kimberly S. Ephgrave, Jeffrey L. Conklin

Research output: Contribution to journalArticle

5 Citations (Scopus)


The aim of our study was to determine the effect of lipopolysaccharide (LPS) on sphincter of Oddi (SO) motility. Opossums received saline, Escherichia coli LPS (1.0 mg/kg), or E. coli LPS (1.0 mg/kg) and aminoguanidine (50 mg/kg), and the SO was removed 6-24 h later. At 12 h LPS decreased electrical field stimulation (EFS)-induced relaxation and increased baseline tone. These changes were reversed when the animals were pretreated with aminoguanidine. The dose-dependent decrease in EFS-induced relaxation by Nω-nitro-L-arginine was impaired after LPS, but not in animals that received LPS and aminoguanidine. The impaired EFS-induced relaxation after LPS was reversed when L-arginine was added to the tissue bath. Serum levels of NO2-/NO3- were increased with LPS as compared to saline or both LPS and aminoguanidine. Inducible nitric oxide synthase mRNA was readily seen in SO segments after LPS. LPS impairs EFS-induced relaxation and increases baseline tone of the SO. The effects of LPS on SO motility appear to be mediated by nitric oxide.

Original languageEnglish
Pages (from-to)547-554
Number of pages8
JournalNitric Oxide - Biology and Chemistry
Issue number6
Publication statusPublished - 2001 Jan 1

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Physiology
  • Clinical Biochemistry
  • Cancer Research

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