lasalocid and Inflammation

The effect of potential mediators of mucus secretion was investigated in the isolated vascularly perfused rat colon by using a sandwich enzyme-linked immunosorbent assay for rat colonic mucin and by histochemical analysis. Bethanechol (100-200 microM), bombesin (100 nM), and vasoactive intestinal peptide (VIP, 100 nM) provoked a dramatic mucin discharge (maximal response at 900, 900, and 600% of control loops, respectively). VIP-stimulated mucin secretion was abolished by tetrodotoxin, whereas atropine was without effect. In contrast, both tetrodotoxin and atropine significantly decreased mucin release induced by bombesin. Isoproterenol or calcitonin gene-related peptide was without effect. Serotonin (1-5 microM) and peptide YY (10 nM) evoked mucin discharge, whereas glucagon-like peptide-1 did not release mucin. Finally, bromolasalocid (20 microM), interleukin-1beta (0.25 nM), sodium nitroprusside (1 mM), and dimethyl-PGE2 (2.5 microM) induced mucus discharge. The results demonstrated a good correlation between the immunological method and histological analysis. In conclusion, these findings suggest a role for the enteric nervous system, the enteroendocrine cells, and resident immune cells in mediation of colonic mucus release.

Topics: 16,16-Dimethylprostaglandin E2; Animals; Atropine; Bethanechol; Bombesin; Calcitonin Gene-Related Peptide; Colon; Enteric Nervous System; Gastrointestinal Hormones; Glucagon; Glucagon-Like Peptide 1; Inflammation; Interleukin-1; Intestinal Mucosa; Isoproterenol; Lasalocid; Male; Mucus; Neurotransmitter Agents; Nitroprusside; Peptide Fragments; Peptide YY; Protein Precursors; Rats; Rats, Wistar; Serotonin; Tetrodotoxin; Vasoactive Intestinal Peptide