Cytoprotective effect of bismuth subsalicylate in indomethacin-treated rats is associated with enhanced mucus bismuth concentration.

Abstract:

BACKGROUND:Bismuth compounds prevent gastric injury from the short-term administration of nonsteroidal anti-inflammatory drugs. We studied the mechanisms underlying the gastroprotective actions of bismuth subsalicylate against indomethacin-induced injury in rats. METHODS:An in vivo microscopic technique was used in which acid output, surface cell intracellular pH (pHi), gastric mucus gell thickness and mucosal blood flow were measured simultaneously. Concentrations of bismuth in mucus were measured by atomic absorption. RESULTS:Indomethacin (60 mg/kg) significantly thinned the mucus gel layer and augmented the decrease of pHi during luminal acid superfusion, consistent with a weakened gastric mucosal barrier to acid. Bismuth subsalicylate partially reversed this effect of indomethacin on pHi, consistent with gastroprotection. Neither a prostaglandin-inhibiting but non-injurious dose of indomethacin (5 mg/kg), bismuth subsalicylate, or their combination affected mucus gel thickness or pHi homeostasis. In separate experiments, indomethacin (60 mg/kg) significantly increased gastric mucus bismuth concentration in rats given bismuth subsalicylate. CONCLUSION:Bismuth accumulation in the gastric mucus during the evolution of mucosal injury may play an important role in the gastroprotective effect of bismuth subsalicylate against indomethacin injury.

journal_name

Aliment Pharmacol Ther

authors

Tanaka S,Guth PH,Carryl OR,Kaunitz JD

doi

10.1046/j.1365-2036.1997.00170.x

subject

Has Abstract

pub_date

1997-06-01 00:00:00

pages

605-12

issue

3

eissn

0269-2813

issn

1365-2036

journal_volume

11

pub_type

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