Preliminary Comparison of Endoscopic Brush and Net Catheters as the Sampling Tool to Analyze the Intestinal Mucus in the Rectum with Ulcerative Colitis Patients

Masanao Nakamura, Keiko Maeda, Kenta Yamamoto, Takeshi Yamamura, Tsunaki Sawada, Eri Ishikawa, Naomi Kakushima, Kazuhiro Furukawa, Tadashi Iida, Yasuyuki Mizutani, Takuya Ishikawa, Eizaburo Ohno, Takashi Honda, Masatoshi Ishigami, Hiroki Kawashima

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Background: The pathophysiology of ulcerative colitis (UC) remains unclear, but early lesions on the colorectal mucosal surface may play an important role in its etiology. Intestinal mucus samples, including inner and outer layers, are collected by net or brush catheters, but the quality of the samples obtained by each method has not been fully investigated. Objective: The purpose of this study was to compare the microbiome and protein content of intestinal mucus collected by net and brush catheters during colonoscopy. Methods: Intestinal mucus samples from the lower rectum of 4 patients with UC were collected using a net catheter, a brush catheter, and intestinal fluid suction. Microbiome and protein content were analyzed using 16S rRNA gene sequencing and mass spectrometry. Results: The patients demonstrated significant differences in microbiome alpha diversity (p < 0.05), but this difference was not observed between the sampling methods. Net catheter samples demonstrated higher total protein concentrations than brush catheter samples. The brush catheter group had more Lachnospira, a butyrate-producing bacterium, when compared to the net group. The brush catheter group also had more oral bacteria of Staphylococcus and Dialister in those with active phase when compared to the net group. Conclusions: Brush catheters are more likely to collect the intestinal mucus inner layer, whereas net catheters are more likely to collect larger samples that include the outer mucus layer, as well as the intestinal fluid. Two sampling methods with different types of collection of the mucosa may lead to different results among patients with mucosal vulnerabilities.

Original languageEnglish
Pages (from-to)232-243
Number of pages12
JournalDigestion
Volume103
Issue number3
DOIs
Publication statusPublished - 01-05-2022
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Gastroenterology

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