Endothelin-1 induces mucosal mast cell degranulation and tissue injury via ETA receptors

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Abstract

The effects of endothelin-1 (ET-1) on mucosal mast cells are of special interest, since they may be an important component of the tissue response that occurs during ischaemic preconditioning or ischaemia/re-oxygenation injuries. Increasing doses of ET-1 were administered intravenously to anaesthetized rats. In a second series of experiments, animals were pretreated with the ETA receptor antagonists BQ-610 or ETR-P1/fl peptide, or with the ETB receptor antagonist IRL-1038. Intestinal perfusion changes were recorded, and the proportion of degranulated mast cells and the degree of mucosal damage were determined in ileal biopsies. ET-1 induced dose-dependent alterations in the haemodynamic and morphological parameters, and caused significant mast cell degranulation. These changes were inhibited significantly by pretreatment with the ETA receptor antagonists, but not with the ETB receptor antagonist. We conclude that a cross-talk exists between endothelial cell-derived humoral mediators and the intestinal mast cell system.

Original languageEnglish
Pages (from-to)31S-34S
JournalClinical science
Volume103
Issue numberSUPPL. 48
DOIs
Publication statusPublished - Aug 2002

Keywords

  • ET receptor
  • ETR-P1/fl peptide
  • Mucosal damage
  • Rat
  • Small intestine

ASJC Scopus subject areas

  • Medicine(all)

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