The fermentation and isolation of a new, non-peptide cholecystokinin antagonist, asperlicin, produced by Aspergillus alliaceus is described. The potent and specific interaction of asperlicin with cholecystokinin receptors was shown using in vitro biochemical assays.

BACKGROUND & AIMS The role of small intestinal proteolytic activity in the regulation of upper gastrointestinal function in humans is poorly understood. The aim of this study was to determine the importance of proteolytic activity for protein- or amino acid-induced cholecystokinin release and pancreaticobiliary secretion. METHODS In 9 healthy subjects, saline was perfused intraduodenally for ...

In the hippocampal CA1 area, a relatively homogenous population of pyramidal cells is accompanied by a diversity of GABAergic interneurons. Previously, we found that parvalbumin-expressing basket, axo-axonic, bistratified, and oriens-lacunosum moleculare cells, innervating different domains of pyramidal cells, have distinct firing patterns during network oscillations in vivo. A second family of...

Two components--one resembling intact cholecystokinin in size and charge and immunologic specificity, and the other resembling the COOH-terminal octapeptide of cholecystokinin--have been found in extracts of the pig cerebral cortex. The relative concentrations of the two peptides in the extracts were dependent on the extractant, boiling 0.1 M HCl being more effective than boiling water for the ...

Cholecystokinin and gastrin receptors (CCK1R and CCK2R) are G protein-coupled receptors that have been the subject of intensive research in the last 10 years with corresponding advances in the understanding of their functioning and physiology. In this review, we first describe general properties of the receptors, such as the different signaling pathways used to exert short- and long-term effect...

Three anti-cholecystokinin antibodies were used to label the stomatogastric nervous system of the crab Cancer borealis. Labeled tissues were examined as whole mounts using laser scanning confocal microscopy. Although each of the anti-cholecystokinin antibodies labeled a variety of structures within the stomatogastric nervous system (including somata, fibers and neuropil), the pattern of labelin...

Caerulein, CCK8, and gastrin, hormones which interact with the cholecystokinin receptor increased the growth of mouse pancreatic acinar cells in vitro. In contrast, bombesin, substance P, and carbachol, factors which interact with separate receptors, and stimulate pancreatic secretion similarly to CCK by mobilising intracellular Ca2+, did not have any effect on the growth of pancreatic acinar c...

1. Two studies were undertaken to develop a model of experimentally induced anxiety in normal volunteers based on cholecystokinin (CCK) receptor agonism/antagonism. 2. In Study 1 rapid intravenous injections of the CCK receptor subtype B (CCKB) agonist pentagastrin (0.15, 0.3 and 0.6 micrograms kg-1) were found to produce dose-related increases in subjective ratings of anxiety compared with pla...