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Abstract
Lipoxygenase metabolites of arachidonic acid are effective mucus secretagogues in the respiratory tract but their efficacy in the intestinal tract was unknown. Mucosal explants and sheets of epithelial cells isolated from rabbit small and large intestine were exposed to leukotrienes B 4, C 4, and D 4 and monohydroxyeicosatetraenoic acids 5-HETE, 12-HETE, and 15-HETE. Light and electron microscopic inspection of goblet cells in treated tissues failed to detect evidence of recent compound exocytosis of mucin granules or other morphological evidence of secretory activity. These results indicate that lipoxygenase metabolites are not directly responsible for the increased mucus secretion observed in ulcerative colitis.
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