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Cholecystokinin-dependent selective inhibitory effect on ‘minute rhythm’ in the ovine small intestine

Published online by Cambridge University Press:  19 November 2008

K. W. Romański
K. W. Romański*
Affiliation:
Department of Animal Physiology, Veterinary School, Wrocław University of Environmental and Life Sciences, Norwida 31, 50-375 Wrocław, Poland
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Abstract

Cholecystokinin (CCK) can exert multiple actions on intestinal motility but its effect on the small-intestinal ‘minute rhythm’ (MR) is virtually unknown. Therefore, the electrical activity from the abomasal antrum, duodenal bulb, duodenum, jejunum and ileum was continuously recorded in six sheep before, during and after slow intravenous administration, of three doses each, of cholecystokinin-octapeptide (CCK-OP) and cerulein. In four of these sheep, two additional electrodes and the strain gauge force transducer were also inserted in the duodenum. Chronic experiments were performed in the fasted and non-fasted animals and saline or CCK peptides were injected during phases 1, 2a or 2b of the duodenal migrating myoelectric complex (MMC). The administration of both CCK peptides in various doses evoked an inhibitory effect mostly in the duodenal bulb, except for the lowest dose of cerulein. The effects of 20 times greater doses of CCK-OP than that of cerulein were more pronounced. The introduction of both CCK peptides during phase 1 of the MMC produced no marked or significant response. In non-fasted animals, the effects of both hormonal peptides, given during phase 2b of the MMC, were often stronger than those given during phase 2a, while in fasted animals the effects of CCK peptides, administered in the course of phases 2a and 2b of the MMC, were similar. Both higher doses of CCK peptides increased the number of spike bursts within the given MR pattern in the duodenum and decreased the incidence of MR mostly in the duodenal bulb. The inhibitory effects of both CCK peptides on the bulbar MR exhibited a dose-response character, though the lowest dose often evoked the slight stimulatory response. It is concluded that CCK principally exerts an inhibitory effect upon the MR in the duodenal bulb and modifies the MR in the duodenum by increasing the spike burst number in a given MR pattern. Both these actions of CCK peptides seem to be physiological. There is a positive relationship between the intensity of the refractory period and the demonstrated effect of CCK in the duodenum.

Keywords

sheepcholecystokinin-octapeptideceruleinduodeno-jejunumminute rhythm
Type
Full Paper
Information
animal , Volume 3 , Issue 2 , February 2009 , pp. 275 - 286
Copyright
Copyright © The Animal Consortium 2008

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