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Pepsinogen Secretion in Cholecystokinin-1 Receptor-Deficient Rats

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Abstract

We examined the roles of cholecystokinin (CCK)-2 receptors in the regulation of pepsinogen secretion in the CCK-1 receptor deficient Otsuka Long–Evans Tokushima Fatty (OLETF) rats. Pepsinogen secretion was determined in fasted acute fistula OLETF and control Long–Evans Tokusima Otsuka (LETO) rats. Pepsinogen secretion in OLETF rats under basal conditions as well as in response to CCK-8 stimulation was significantly higher than that in LETO rats. CCK-1 receptor specific agonist ARL 15849 was unable to stimulate pepsinogen secretion in OLETF rats, whereas it elicited pepsinogen secretion in LETO rats to levels similar to those obtained with equimolar CCK-8 stimulation. CCK-2 receptor antagonist reduced basal pepsinogen secretion and completely abolished CCK-8-stimulated pepsinogen output in OLETF rats, whereas in LETO rats, it reduced basal pepsinogen secretion but augmented CCK-8-stimulated pepsinogen output. CCK-1 receptor antagonist loxiglumide also greatly decreased CCK-8-stimulated pepsinogen secretion in OLETF rat, which indicates that loxiglumide is not a specific CCK-1 receptor antagonist. Intravenous infusion of somatostatin antagonist significantly increased CCK-8-stimulated pepsinogen secretion in LETO rats, whereas it had no significant influence on CCK-8-stimulated pepsinogen secretion in OLETF rats. These results indicate that CCK-8 stimulates pepsinogen secretion via CCK-2 receptors in CCK-1 receptor deficient OLETF rats and that the higher CCK-8-stimulated as well as basal pepsinogen secretion in OLETF rats might result from an elimination of tonic inhibition by somatostatin that is released from D cells through mainly CCK-1 receptors.

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Authors and Affiliations

  1. Third Department of Internal Medicine, University of Occupational and Environmental Health, Japan

    Kenji Kanagawa, Hayato Nakamura & Makoto Otsuki

  2. School of Medicine, Kitakyushu, 807-8555, Japan

    Kenji Kanagawa, Hayato Nakamura & Makoto Otsuki

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  1. Kenji Kanagawa
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  2. Hayato Nakamura
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  3. Makoto Otsuki
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Kanagawa, K., Nakamura, H. & Otsuki, M. Pepsinogen Secretion in Cholecystokinin-1 Receptor-Deficient Rats. Dig Dis Sci 49, 1531–1537 (2004). https://doi.org/10.1023/B:DDAS.0000042260.84749.ab

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  • DOI: https://doi.org/10.1023/B:DDAS.0000042260.84749.ab

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