Annals of Coloproctology

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Translational/basic research

Effects of angiotensin peptides on colonic motility in rats: Gi Won Ha, Jong Hun Kim, Suhn Hee Kim; Ann Coloproctol. 2023;39(3):267-274. Published online March 30, 2022; DOI: https://doi.org/10.3393/ac.2022.00087.0012

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Purpose
Renin-angiotensin system (RAS) is involved in the pathophysiology of colonic inflammation. The aim of this study was to investigate whether small angiotensins (Angs) peptides play a role in the regulation of colonic motility and their roles are modulated in colitis.
Methods
Experimental colitis was induced by an intake of 5% dextran sulfate sodium (DSS) dissolved in tap water for 7 days in Sprague-Dawley rats. After sacrifice, plasma hormone concentrations and messenger RNAs (mRNAs) for RAS were measured. Functional analysis of colonic motility in response to Angs peptides was performed using Taenia coli.
Results
DSS-treated colon showed an increased necrosis with massive infiltration of inflammatory cells. The mRNA level of colonic angiotensin II receptor type 2 (AT2R) in DSS-treated rats was higher than that in control rats whereas the mRNA levels of angiotensin II converting enzyme (ACE), ACE2, AT1R, AT4R, and Mars receptor were not different from those in control rats. Ang III, Ang IV, and Ang-(1-9) (1, 3 μM) increased the frequency of basal colonic motility. Ang-(1-7) did not cause any significant changes in frequency and amplitude of basal motility. The order of potency for an increased frequency of basal motility seems to be Ang II>>Ang IV>Ang III=Ang-(1-9). The increased frequency of basal motility by Ang-(1-9) but not Ang IV was significantly enhanced in DSS-treated rat colon.
Conclusion
In conclusion, these data suggest that small Angs peptides are partly involved in the pathophysiological regulation of colonic motility in experimental colitis.

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Systematic-Narrative Hybrid Literature Review: Crosstalk between Gastrointestinal Renin–Angiotensin and Dopaminergic Systems in the Regulation of Intestinal Permeability by Tight Junctions
Nadia Khan, Magdalena Kurnik-Łucka, Gniewomir Latacz, Krzysztof Gil
International Journal of Molecular Sciences.2024; 25(10): 5566. CrossRef

Changes in Migrating Motor Complex after Bowel Obstruction in the Murine Ileum.: Moon, Sang Hui , Oh, Heung Kwon , Ryoo, Seungbum , Choe, Eun Kyung , Moon, Jung Sun , Park, Kyu Joo; J Korean Soc Coloproctol. 2010;26(3):171-178.; DOI: https://doi.org/10.3393/jksc.2010.26.3.171

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PURPOSE
Partial obstruction of the small bowel causes hypertrophy of smooth muscle cells and enteric neurons. After small bowel obstruction, slow waves have also been reported to disappear or to be greatly reduced at the oral site of the obstruction in the murine ileum. The purpose of this research was to study the changes in migrating motor complexes (MMCs) after partial obstruction in order to compensate for the attenuated function of slow waves.
METHODS
A ring of film (6 mm in length, 4 mm in internal diameter) was placed over the small intestine 5-6 cm oral to the ileocecal valve in 8-10 wk old female ICR mice. These rings resulted in a partial obstruction of the intestine after 2 wk. The mechanical activities of the small intestine were recorded and the amplitude, interval, and half-duration of the MMCs were analyzed.
RESULTS
The MMCs from a partially obstructed ileum occurred every 1.58+/-1.06 min and had a half-duration of 6.90+/-5.54 sec. The interval and the half-duration of the control MMCs were 3.60+/-1.11 min and 31.5+/-11.4 sec, respectively. The difference in interval and the half-duration of the MMCs reached statistical significance (P=0.03; P=0.00). The amplitude and the area under the curve (AUC) of the MMCs of the obstructed ileum were much higher than those of the control (31.3+/-8.86 vs. 6.05+/-1.92 mN; 161.18+/-44.09 vs. 72.95+/-2.45 mN . sec/MMC wave; P=0.00, 0.02).
CONCLUSION
The MMCs with higher amplitude and AUC, with shorter interval, and with shorter half-duration, compared with those of the control, were recorded from the partially obstructed murine ileum, reflecting efforts to overcome the effect of obstruction by increasing the power of contractions.

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Migrating motor complex changes after side-to-side ileal bypass in mouse ileumex-vivo: mechanism underlying the blind loop syndrome?
Suk-Bae Moon, Kyu-Joo Park, Jung-Sun Moon, Eun-Kyoung Choe, In-Suk So, Sung-Eun Jung
Journal of the Korean Surgical Society.2011; 80(4): 251. CrossRef

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