Mediation by CCKB receptors of the CCK‐evoked hyperaemia in rat gastric mucosa

Akos Heinemann, Milana Jociĉ, Ulrike Holzer‐Petsche, Gábor Pethö, Brigitta M. Peskar, David C. Horwell, Peter Holzer

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18 Citations (Scopus)

Abstract

Cholecystokinin octapeptide (CCK‐8) and gastrin‐17 augment gastric mucosal blood flow in the rat. The present study examined whether the gastric vasodilator effect of these peptides is mediated by CCKA or CCKB receptors. Intravenous injection of CAM‐1481 (1 mg kg−1), a dipeptoid antagonist of CCKA receptors, or CAM‐1028, a dipeptoid CCKB receptor antagonist (1 mg kg−1), had no effect on basal gastric mucosal blood flow as determined by the clearance of hydrogen in urethane‐anaesthetized rats. Intravenous infusion of CCK‐8 or gastrin‐17 (8–200 pmol min−1) increased gastric mucosal blood flow in a dose‐dependent fashion. The CCKB receptor antagonist, CAM‐1028, significantly attenuated the hyperaemic response to CCK‐8 and gastrin‐17 whereas the CCKA receptor antagonist, CAM‐1481, did not antagonize CCK‐8 but caused a slight attenuation of the vasodilator response to gastrin‐17. The selectivity of the two antagonists was proved by the findings that CAM‐1028, but not CAM‐1481, inhibited gastric acid secretion evoked by CCK‐8 or gastrin‐17 (CCKB receptor assay) while CAM‐1481, but not CAM‐1028, inhibited the CCK‐8‐induced contraction of guinea‐pig isolated gall bladder strips (CCKA receptor assay). These data show that the actions of CCK‐8 and gastrin‐17 to increase mucosal blood flow in the rat stomach are primarily mediated by CCKB receptors. 1995 British Pharmacological Society

Original languageEnglish
Pages (from-to)2274-2278
Number of pages5
JournalBritish journal of pharmacology
Volume116
Issue number4
DOIs
Publication statusPublished - Oct 1995

Keywords

  • CAM‐1028
  • CAM‐1481
  • CCK receptor antagonists
  • CCK receptors
  • CCK receptors
  • CCK receptors
  • Cholecystokinin (CCK)
  • cholecystokinin octapeptide (CCK‐8)
  • gall bladder contraction
  • gastric acid secretion
  • gastric mucosal blood flow
  • gastrin
  • gastrin‐17
  • hyperaemia
  • vasodilatation

ASJC Scopus subject areas

  • Pharmacology

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    Heinemann, A., Jociĉ, M., Holzer‐Petsche, U., Pethö, G., Peskar, B. M., Horwell, D. C., & Holzer, P. (1995). Mediation by CCKB receptors of the CCK‐evoked hyperaemia in rat gastric mucosa. British journal of pharmacology, 116(4), 2274-2278. https://doi.org/10.1111/j.1476-5381.1995.tb15064.x