J Neurogastroenterol Motil  
The Effect of Deoxycholic Acid on Secretion and Motility in the Rat and Guinea Pig Large Intestine
Nam Hee Kim,1 Jung Ho Park,1* Jae-soon Park,2 and Yeun-Ho Joung2
1Departments of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University College of Medicine, Seoul, Korea; and 2Department of Electronics and Control Engineering, Hanbat National University, Daejeon, Korea
Correspondence to: Jung Ho Park, MD
Department of Medicine, Sungkyunkwan University School of Medicine, Kangbuk Samsung Hospital, 29, Saemunan-ro, Jongno-Ku, Seoul 110-746, Korea
Tel: +82-2-2001-2059, Fax: +82-2-2001-2485, E-mail: pjho3@hotmail.com
Received: November 24, 2016; Revised: February 18, 2017; Accepted: March 12, 2017; Published online: May 29, 2017.
© The Korean Society of Neurogastroenterology and Motility. All rights reserved.

cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Bile acid is an important luminal factor that affects gastrointestinal motility and secretion. We investigated the effect of bile acid on secretion in the proximal and distal rat colon and coordination of bowel movements in the guinea pig colon.
The short-circuit current from the mucosal strip of the proximal and distal rat colon was compared under control conditions after induction of secretion with deoxycholic acid (DCA) as well as after inhibition of secretion with indomethacin, 1,2-bis (o-aminophenoxy) ethane-N, N,N′,N′-tetra-acetic acid (an intracellular calcium chelator; BAPTA), and tetrodotoxin (TTX) using an Ussing chamber. Colonic pressure patterns were also evaluated in the extracted guinea pig colon during resting, DCA stimulation, and inhibition by TTX using a newly developed pressure-sensing artificial stool.
The secretory response in the distal colon was proportionate to the concentration of DCA. Also, indomethacin, BAPTA, and TTX inhibited chloride secretion in response to DCA significantly (P < 0.05). However, these changes were not detected in the proximal colon. When we evaluated motility, we found that DCA induced an increase in luminal pressure at the proximal, middle, and distal sensors of an artificial stool simultaneously during the non-peristaltic period (P < 0.05). In contrast, during peristalsis, DCA induced an increase in luminal pressure at the proximal sensor and a decrease in pressure at the middle and distal sensors of the artificial stool (P < 0.05).
DCA induced a clear segmental difference in electrogenic secretion. Also, DCA induced a more powerful peristaltic contraction only during the peristaltic period.
Keywords: Colon; Deoxycholic acid; Gastrointestinal motility; Peristalsis; Secretion

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