Investigation of cholecystokinin receptors in the human lower esophageal sphincter
Files
(Published Version)
Date
2014
Authors
Liu, J.
Zhang, J.
Liu, X.
Drew, P.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
World Journal of Gastroenterology, 2014; 20(21):6554-6559
Statement of Responsibility
Jun-Feng Liu, Jian Zhang, Xin-Bo Liu, Paul A Drew
Conference Name
Abstract
Aim: To compare the binding of cholecystokinin (CCK)-8 to CCK receptors in sling and clasp fibers of the human lower esophageal sphincter. Methods: Esophageal sling and clasp fibers were isolated from eight esophagectomy specimens, resected for squamous cell carcinoma in the upper two thirds of the esophagus, which had been maintained in oxygenated Kreb's solution. Western blot was used to measure CCK-A and CCK-B receptor subtypes in the two muscles. A radioligand binding assay was used to determine the binding parameters of (3)H-CCK-8S to the CCK receptor subtypes. The specificity of binding was determined by the addition of proglumide, which blocks the binding of CCK to both receptor subtypes. Results: There was no significant difference between the sling and clasp fibers of the human lower esophageal sphincter in the amount of CCK-A [integrated optical density (IOD) value: 22.65 ± 0.642 vs 22.328 ± 1.042, P = 0.806] or CCK-B receptor protein (IOD value: 13.20 ± 0.423 vs 12.45 ± 0.294, P = 0.224) as measured by Western blot. The maximum binding of radio-labeled CCK-8S was higher in the sling fibers than in the clasp fibers (595.75 ± 3.231 cpm vs 500.000 ± 10.087 cpm, P < 0.001) and dissociation constant was lower (K(d): 1.437 ± 0.024 nmol/L vs 1.671 ± 0.024 nmol/L, P < 0.001). The IC₅₀ of the receptor specific antagonists were lower for the CCK-A receptors than for the CCK-B (P < 0.01). Conclusion: CCK binding modulates the contractile function of the lower esophageal sphincter through differential binding to the CCK-A receptor on the sling and clasp fibers.
School/Discipline
Dissertation Note
Provenance
Description
Access Status
Rights
© The Author(s) 2014. Published by Baishideng Publishing Group Inc. All rights reserved Copyright © The author(s) 1995-2016. Published by Baishideng Publishing Group Inc. All rights reserved. Articles published by this open-access journal are distributed under the terms of the Creative Commons Attribution-Noncommercial (CC BY-NC 4.0) License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited, the use is non commercial and is otherwise in compliance with the license.