Mucosal Tuft Cell Density Is Increased in Diarrhea-Predominant Irritable Bowel Syndrome Colonic Biopsies

被引:14
作者
Aigbologa, Jessica [1 ]
Connolly, Maeve [2 ]
Buckley, Julliette M. [3 ,4 ]
O'Malley, Dervla [1 ,2 ]
机构
[1] APC Microbiome Ireland, Cork, Ireland
[2] Univ Coll Cork, Dept Physiol, Cork, Ireland
[3] Univ Coll Cork, Dept Surg, Cork, Ireland
[4] Mater Private Hosp, Cork, Ireland
来源
FRONTIERS IN PSYCHIATRY | 2020年 / 11卷
基金
爱尔兰科学基金会;
关键词
interleukin-25; irritable bowel syndrome; helminths; Wistar Kyoto; brush cells; Doublecortin Linked Kinase-1; DCAMKL1; chronic stress; GASTROINTESTINAL-TRACT; BRUSH CELLS; STRESS; IMMUNITY; IDENTIFICATION; INTERLEUKIN-6; DYSFUNCTION; PREVALENCE; MICROBIOTA; MEDIATORS;
D O I
10.3389/fpsyt.2020.00436
中图分类号
R749 [精神病学];
学科分类号
100205 ;
摘要
Tuft cells are rare chemosensory sentinels found in the gut epithelium. When triggered by helminth infection, tuft cells secrete interleukin-25 (IL-25) basolaterally and subsequently evoke an immune response. Irritable bowel syndrome (IBS) is a common and heterogeneous disorder characterized by bowel dysfunction and visceral pain sensitivity. Dysfunctional gut-brain communication and immune activation contribute to the pathophysiology of this disorder. The study aims were to investigate changes in tuft cell density in non-post-infectious IBS patients. Immunofluorescent labeling of DCLK1-positive tuft cells was carried out in mucosal biopsies from the distal colons of diarrhea and constipation-predominant IBS patients and healthy controls. Tuft cell numbers were also assessed in animal models. Concentrations of interleukin-25 (IL-25) secreted from colonic biopsies and in plasma samples were analyzed using an immunoassay. The density of tuft cells was increased in diarrhea-but not constipation-predominant IBS patient colonic biopsies. Biopsy secretions and plasma concentrations of IL-25 were elevated in diarrhea-but not constipation-predominant IBS participants. Tuft cell hyperplasia was detected in a rat model of IBS but not in mice exposed to chronic stress. Tuft cell hyperplasia is an innate immune response to helminth exposure. However, the patients with diarrhea-predominant IBS have not reported any incidents of enteric infection. Moreover, rats exhibiting IBS-like symptoms displayed increased tuft cell density but were not exposed to helminths. Our findings suggest that factors other than helminth exposure or chronic stress lead to tuft cell hyperplasia in IBS colonic biopsies.
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页数:9
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