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The concentration of VIP in duodenum and jejunum as well as the interaction of VIP (binding and stimulation of cyclic AMP accumulation) with epithelial cells from both gut segments were studied in rats after surgical bypass of the pylorus by gastroduodenostomy. Duodenal VIP concentration increased in rats with gastroduodenostomy as compared to sham-operated animals. The binding capacity (but not the affinity) of VIP binding sites and the efficiency (but not the potency) of VIP on cyclic AMP accumulation decreased in the condition of gastroduodenostomy. However, no modifications in either VIP concentration and interaction could be seen at the jejunal level.
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