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Serine Proteases in Gastrointestinal Function and Irritable Bowel Syndrome (IBS)

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赞助商
University of North Carolina, Chapel Hill
合作者
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)

关键词

抽象

The proposed pilot project for this seed grant focuses on the role of intestinal serine-proteases in the pathogenesis of diarrhea-predominant IBS (D-IBS). In this study we will further assess serine-protease activity in patients with D-IBS and also explore a possible mechanism by which these proteases can lead to alterations in intestinal physiology and symptoms in these patients.
The general hypotheses for the proposed research are that (A) the levels of fecal serine-protease in patients with D-IBS are abnormally increased (B) this abnormal serine-protease activity leads to/is associated with an abnormal increase in intestinal permeability and therefore enables (C) chronic stimulation and activation of the mucosal immune system in these patients. In addition, it is aim to determine whither periodontal inflammation is associated with intestinal permeability and serine protease activity.

日期

最后验证: 03/31/2014
首次提交: 02/17/2010
提交的预估入学人数: 02/18/2010
首次发布: 02/21/2010
上次提交的更新: 03/09/2016
最近更新发布: 03/10/2016
实际学习开始日期: 01/31/2009
预计主要完成日期: 11/30/2015
预计完成日期: 11/30/2015

状况或疾病

Colon, Irritable

-

手臂组

干预/治疗
IBS
Subjects with IBS-D
Healthy
Healthy Subjects

资格标准

有资格学习的年龄 18 Years 至 18 Years
有资格学习的性别All
取样方式Non-Probability Sample
接受健康志愿者
标准

Inclusion Criteria:

- Any sex, race, or ethnicity.

- At least 18 years of age (no upper age limit).

- D-IBS patients must meet Rome III criteria for IBS and must have been evaluated by a physician to exclude other diseases that could explain the symptoms. For the latter, patients self statement is acceptable (no official document is required).

- Participation in Dr. Whitehead's 'heterogeneity of IBS' and/or Dr. Ringel's 'intestinal inflammation in patients with D-IBS' research study.

Exclusion Criteria:

- Healthy controls must have no significant or recurring gastrointestinal symptoms.

- Patients and healthy controls should not have a serious, unstable medical condition.

- Patients and healthy controls must have had no gastrointestinal tract surgery other than appendectomy or cholecystectomy.

- Patients and healthy controls must not be pregnant (by self-report). Pregnant women will not be allowed to participate as pregnancy can affect gastrointestinal symptoms.

- Patients and healthy controls must not have a history of inflammatory bowel disease, celiac disease, or other diagnosis that could explain chronic or recurring bowel symptoms in IBS patients or controls.

- Patients and healthy controls should have no history of lactose malabsorption (by self-report).

- Patients and healthy controls should have no history of clinical symptoms of acute infections during the last 8 weeks prior to enrolment in the study.

- Patients and healthy controls should have no history of anti-inflammatory agents including aspirin, non-aspirin, non-steroid anti-inflammatory (NSAID) or steroids in the last four weeks prior to study enrollment.

- Patients should not intentionally consume probiotics or undergo antibiotic treatment during the last 4 weeks prior to enrolment in the study. If the subject consumed any of these medications, a washout period of 4 weeks will be required).

- Patients must have no history of fainting or light headedness during periods of fasting.

- Patients must not have diabetes mellitus, or any similar conditions, that would cause an adverse reaction to the sugar drink.

结果

主要结果指标

1. fecal serine protease activity [protease activity determined at at recruitment]

we will use an elisa-based method to measure the activity of serine proteases in fecal samples from IBS and HC subjects

次要成果指标

1. intestinal permeability [6hrs following recruitment]

We will analyze sugar concentrations in urine to determine the level of intestinal permeability.

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