Intraluminal acid and gastric mucosal integrity: the importance of blood-borne bicarbonate

Author:

Synnerstad Ingrid1,Johansson Mia1,Nylander Olof1,Holm Lena1

Affiliation:

1. Department of Physiology, Biomedical Center, Uppsala University, S-751 23 Uppsala, Sweden

Abstract

The acid-secreting gastric mucosa resists intraluminal acid better than the nonsecreting. Here we investigated pH at the epithelial cell surface, mucosal permeability, and blood flow during intraluminal administration of acid (100 mM) in acid-stimulated and nonstimulated gastric corpus mucosae. Surface pH (H+-selective microelectrodes), permeability (clearance of51Cr-EDTA), and mucosal blood flow (laser-Doppler flowmetry) were studied in Inactin-anesthetized rats. Acid secretion was stimulated with pentagastrin (40 μg · kg−1· h−1) or impromidine (500 μg · kg−1· h−1), or HCO3(5 mmol · kg−1· h−1) given intravenously. Surface pH was only slightly reduced by intraluminal acid in acid secretion-stimulated or HCO3-treated rats but was substantially lowered in nonstimulated rats. Clearance increased threefold and blood flow increased by ≈75% in nonstimulated rats. During stimulated acid secretion or intravenous infusion of HCO3, clearance was unchanged and blood flow increased by only ≈30% during intraluminal acid. Increased epithelial transport of HCO3buffering the mucus gel is most probably the explanation for the acid-secreting mucosa being less vulnerable to intraluminal acid than the nonsecreting.

Publisher

American Physiological Society

Subject

Physiology (medical),Gastroenterology,Hepatology,Physiology

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