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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Mechanisms of stimulatory effect of neuromedin C on pancreatic exocrine secretion in conscious rats.

The mechanisms of the stimulatory effect of the bombesin-like peptide neuromedin C on pancreatic exocrine secretion were examined in conscious rats. Rats were prepared with cannulae draining bile and pancreatic juice separately. Intravenous infusion of 0.35 nmol/kg/h of neuromedin C significantly increased the secretions of pancreatic bicarbonate and protein, and transiently increased the plasma cholecystokinin ( CCK) concentration. The increase in pancreatic secretion persisted for 90 min, whereas the increase in plasma CCK was observed only after 15 and 30 min from the beginning of neuromedin C infusion. Intravenous infusion of CR-1409, a specific CCK-receptor antagonist, inhibited, but did not abolish, the protein secretion stimulated by neuromedin C. Intraduodenal infusion of a potent proton pump inhibitor, omeprazole, suppressed, but did not abolish, protein secretion induced by neuromedin C. Omeprazole abolished the increase in bicarbonate secretion produced by neuromedin C. These results indicate that neuromedin C induces release of CCK and that its induction of pancreatic hypersecretion is due to both its direct effect and CCK. The results also suggest that gastric hypersecretion may have a role in the bicarbonate hypersecretion induced by neuromedin C.[1]

References

  1. Mechanisms of stimulatory effect of neuromedin C on pancreatic exocrine secretion in conscious rats. Okubo, K., Miyasaka, K., Matsumoto, M., Funakoshi, A. Pancreas (1994) [Pubmed]
 
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