Elemental Diet for Treatment of Inflammatory Bowel Disease in Patients With Chronic Granulomatous Disease

Background:

Bacteria that live inside the stomach and intestines are important for health. Chronic granulomatous disease (CGD) and inflammatory bowel disease (IBD) can make people have unhealthy bacteria. This can lead to gastrointestinal (GI) problems. Researchers want to see if people with CGD and IBD feel better when they change the bacteria in the stomach by following a special liquid diet.

Objective:

To see if an elemental diet can change the bacteria in the stomach and intestines of people with CGD and IBD. Also, to see if this helps GI symptoms.

Eligibility:

People ages 8-65 years with CGD, CGD-associated colitis, and IBD.

Design:

Participants will first be screened with:

Upper GI endoscopy and/or colonoscopy. A long, thin tube with a tiny camera at the end will be passed into the participant s body through the mouth or anus. Tissue will be collected. Participants will be sedated for the procedure. They will be sedated using a special mask or small plastic tube placed in an arm vein using a needle.

Participants will be put on the special diet for up to 4 weeks. They will stay in the hospital for up to 2 weeks. They will have check-ups. They will have blood, urine, and stool samples collected. They will keep a symptom diary to record how they feel and any GI symptoms.

Participants will have 2 follow-up visits. The first will be right after they finish the diet. The second will be 4 weeks later. They will have blood, urine, and stool samples collected. They will learn about re-introducing other foods into their diet.

Chronic granulomatous disease (CGD) is a rare genetic immune disorder that results in recurrent and severe infections, and inflammatory dysregulation. For almost 50% of patients with CGD, this inflammation causes severe inflammatory bowel disease (IBD). However, treatment is long term and challenging as CGD-IBD is prone to relapse, and use of immune modulators must be balanced with increased risk of infectious complications. Conventional IBD (Crohn disease and ulcerative colitis) is likely caused by an inappropriate inflammatory response to intestinal microbes, which is influenced by the environment in a genetically susceptible host. While it is not yet clear if intestinal dysbiosis is a result or cause of intestinal inflammation, studies suggest that correcting intestinal dysbiosis may improve intestinal inflammation. Studies in patients with conventional IBD suggest that strict dietary restrictions can resolve symptoms of IBD and induce remission as effectively as glucocorticoids but without the side effects of those drugs. Because these diets alter the gut microbiome, they may serve as effective treatment for CGD-IBD.

In this study, we propose to treat 5 patients \>= 8 years old who have CGD and IBD with 4 weeks of an elemental diet. Participants will stay as inpatients for up to 2 weeks and will return for follow-up at the end of the diet to begin tapering off and be reintroduced to normal food. The primary objective of this study is the evaluation of changes in the microbiome before and after the elemental diet. Secondary objectives are evaluations of tolerability and safety of the diet, along with changes in local and systemic markers of inflammation, and improvement of IBD symptoms as determined by reduction in Harvey-Bradshaw Index score.

Eligibility Criteria:
* INCLUSION CRITERIA:

Individuals must meet all of the following criteria to be eligible for study participation:

* Aged 8-65 years.
* Have confirmed diagnoses of CGD, CGD-associated colitis, and IBD.
* Have a Simple Endoscopic Score for Crohn Disease (SES-CD) \> 3 and/or HBI \>= 5.
* Able to provide informed consent.
* Willing to allow storage of biological samples for future research.
* Willing to allow genetic testing on biological samples.
* Willing to be admitted as inpatient for up to 2 weeks to initiate the elemental diet.

EXCLUSION CRITERIA:

* Pregnancy.
* Active or ongoing infection that requires antibiotics other than the participant s known prophylaxis medications.
* Any condition that, in the opinion of the investigator, contraindicates participation in this study will be excluded from study participation.