Role of bicarbonate in blood flow-mediated protection and repair of damaged gastric mucosa in the cat.
OBJECTIVE
The hyperemic response after superficial gastric mucosal damage is essential for repair of the mucosa. Only indirect evidence suggests that this is caused by supply of bicarbonate. Therefore, this study tested the effect of maintaining the availability of bicarbonate after prevention of the hyperemic response after damage by 2 mol/L NaCl.


METHODS
Celiac artery flow was reduced, as monitored by Doppler ultrasonography, by gradual constriction of the vessel after mucosal damage. Saline (pH 1.0) was perfused through the stomach lumen and thereafter through a closed chamber with pH and PCO2 electrodes.


RESULTS
Exposure to 2 mol/L NaCl produced a marked increase of mucosal blood flow as measured by microspheres (P < 0.025) and a high degree of mucosal restitution 90 minutes after damage as judged by microscopy, whereas prevention of the hyperemic response caused extensive erosions and much less restitution (P < 0.001). The latter effect was completely counteracted by intravenous bicarbonate. High blood concentration of bicarbonate increased luminal release of bicarbonate, whereas high mucosal blood flow did not.


CONCLUSIONS
These data show that bicarbonate is an important factor in blood flow-mediated protection and repair of damaged gastric mucosa and suggest that concentration gradients are the major determinants for transport of bicarbonate across the damaged and restituted mucosa.
Surgical Research Laboratory, Department of Surgery, University of Bergen, Norway.
K
K
Guttu
H
H
Sørbye
H
H
Gislason
K
K
Svanes
J E
JE
Grønbech
D000818:Animals; D001639:Bicarbonates / Q000097:blood / Q000494:pharmacology*; D001784:Blood Gas Analysis; D002415:Cats; D002445:Celiac Artery / Q000502:physiology; D004847:Epithelial Cells; D004848:Epithelium / Q000502:physiology; D005753:Gastric Mucosa / Q000098:blood supply* / Q000166:cytology / Q000473:pathology; D006439:Hemodynamics / Q000502:physiology; D006863:Hydrogen-Ion Concentration; D008297:Male; D012039:Regional Blood Flow / Q000187:drug effects / Q000502:physiology
D001639:Bicarbonates