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. 1984 Dec;83(4):919–925. doi: 10.1111/j.1476-5381.1984.tb16532.x

Release of dynorphin, somatostatin and substance P from the vascularly perfused small intestine of the guinea-pig during peristalsis.

J Donnerer, P Holzer, F Lembeck
PMCID: PMC1986988  PMID: 6083815

Abstract

The release of dynorphin-(1-17), somatostatin and substance P into the venous effluate of the isolated and vascularly perfused guinea-pig small intestine was measured during rest and peristaltic activity. The peptides were determined by specific radioimmunoassays. Increasing the intraluminal pressure by 5 mbar increased the release of dynorphin-(1-17), somatostatin and substance P. A substantial increase in the release of substance P was only seen in the presence of naloxone (1.5 microM) indicating an inhibitory influence of opioid peptide-containing neurones on the release of substance P. The pressure-induced release of substance P and dynorphin-(1-17) was completely prevented by tetrodotoxin (1.3 microM), which suggests a neural origin of these two peptides. The pressure-induced release of somatostatin was only partially inhibited by tetrodotoxin (1.3 microM) suggesting that somatostatin may also be released from non-neuronal sources, i.e. endocrine mucosal cells. Dimethylphenylpiperazinium (32 microM) increased the release of somatostatin and substance P and this effect was inhibited by tetrodotoxin (1.3 microM). Cholecystokinin-octapeptide (38 nM) induced a large increase in the release of somatostatin but only a minute increase in the release of substance P; these effects of cholecystokinin-octapeptide were not blocked by tetrodotoxin (1.3 microM). Noradrenaline (59 microM) inhibited the pressure-induced release of substance P but not that induced by dimethylphenylpiperazinium (32 microM). Neither the pressure-induced nor the dimethylphenylpiperazinium-evoked release of somatostatin was significantly diminished by noradrenaline. These results indicate that dynorphin-(1-17), somatostatin and substance P may be transmitters involved in the coordination of the peristaltic reflex.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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