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- W2062346660 abstract "Over the past few years, we have addressed some of the components that regulate human duodenal bicarbonate secretion (DBS) using a technique for the isolation of a 4-cm duodenal segment from gastric, pancreaticobiliary and distal intestinal secretions. Our observations are summarized as follows. Resting DBS is, to a large extent, maintained by vagal innervation; atropine decreases basal bicarbonate secretion by approximately 80%. Luminal acidification with HCI (H+) is a major physiological stimulus of DBS, resulting in a prompt and significant increase of 3- to 4-fold. H(+)-stimulated DBS is likely to be mediated, at least in part, by prostaglandins of the E class, and by VIP. Each of the latter stimulates DBS independently in a dose-related manner. Since atropine is without effect on the response induced by luminal H+ and sham feeding, in both cases DBS is probably stimulated via a non-cholinergic pathway(s). Moreover, since basal, H(+)- and PGE2-stimulated proximal DBS are unaltered when the plasma-to-lumen bicarbonate concentration gradient is abolished, it may be concluded that DBS in humans involves active transport processes. It is significant that compared to normal subjects, patients with duodenal ulcers show markedly diminished basal and H(+)-stimulated proximal DBS. Furthermore, there is surprisingly little overlap between duodenal ulcer (DU) patients and normal subjects. These findings suggest that an intrinsic cellular or subcellular defect in proximal duodenal mucosal bicarbonate secretion is present in patients with duodenal ulcer disease." @default.
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- W2062346660 date "1990-11-01" @default.
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- W2062346660 title "Human duodenal mucosal bicarbonate secretion-physiological and clinical aspects" @default.
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- W2062346660 doi "https://doi.org/10.1111/j.1365-2796.1990.tb01482.x" @default.
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