Abstract
Intrinsic factor (IF) secretion in healthy male subjects was studied in response to pentagastrin stimulation with and without cimetidine, and to impromidine, a histamine H2 receptor agonist. Peak and total IF output were reduced by cimetidine, but the concentration was unchanged and the response was unaffected by administration of the compound for 1 week. The IF secretory response to impromidine was similar to that to pentagastrin. It is suggested that the acid and IF components of the parietal cell secretory response are mediated via different intracellular pathways, that histamine H2 receptors do not fulfill and obligatory role in the secretion of IF and that synthesis of IF is probably not altered by cimetidine.
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