Altered Control of Gastric Acid Secretion in Gastrin-Cholecystokinin Double Mutant Mice
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Background & Aims: Three pathways control gastric acid secretion: the gastrin-enterochromaffin-like (ECL) cell axis, the vagus-parietal cell axis, and the cholecystokinin (CCK)-D cell axis. Mice lacking gastrin or both gastrin and CCK were examined to determine the role of the hormones. Methods: Acid was measured after pylorus ligation, and biopsies from gastrin knockout (KO), gastrin-CCK double-KO, and wild-type (WT) mice were collected for biochemical, immunocytochemical, and electron-microscopic examination. Results: The ECL cells were inactive in both groups of mutant mice but the cell number was unaffected. Both parietal cell number and level of H+/K +-ATPase messenger RNA (mRNA) were reduced in the mutant strains, but gastrin-CCK double-KO mice displayed more active parietal cells and larger acid output than the gastrin KO mice. The acid response to histamine in double-KO mice was unchanged whereas that to gastrin was diminished, but it could be restored by infusion of gastrin. Oxyntic D-cell density was the same in both mutant strains, but the D cells were more active in the gastrin KO than in the double-KO mice. CCK infusion in gastrin-CCK double-KO mice raised the somatostatin mRNA level and inhibited acid secretion to the level seen in gastrin KO mice. Vagotomy and atropine abolished acid secretion in all 3 groups of mice. Conclusions: Lack of gastrin impairs the gastrin-ECL axis, whereas lack of gastrin and CCK impairs both hormonal pathways. In the gastrin-CCK double-KO mice, acid secretion is only controlled by chollnergic vagal stimulation, which normalizes the acid output.
Originalsprog | Engelsk |
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Tidsskrift | Gastroenterology |
Vol/bind | 126 |
Udgave nummer | 2 |
Sider (fra-til) | 476-487 |
Antal sider | 12 |
ISSN | 0016-5085 |
DOI | |
Status | Udgivet - feb. 2004 |
Bibliografisk note
Funding Information:
Supported by The Novo Nordic foundation (to L.F.H. and R.H.), the Norwegian Research Council (to D.C.), and the Swedish Research Council (to R.H.).
ID: 310771222