Mechanisms of Gulf War Illness

Last updated: September 27, 2024
Sponsor: VA Office of Research and Development
Overall Status: Active - Recruiting

Phase

N/A

Condition

Colic

Gastrointestinal Diseases And Disorders

Non-ulcer Dyspepsia (Nud)

Treatment

Control Arm

Oral Glutamine

Clinical Study ID

NCT05972291
SPLD-006-22F
I01CX001477
  • Ages 18-65
  • All Genders

Study Summary

Many veterans with Gulf War Illness developed chronic gastrointestinal symptoms during their deployment to the Persian Gulf. The pathophysiologic mechanisms of these chronic gastrointestinal symptoms are not well understood but cause significant morbidity in veterans. Our proposed studies will provide an innovative and novel treatment trial for chronic gastrointestinal symptoms in veterans with Gulf War Illness that were deployed into war zones. Given that there are currently no specific treatments for these disorders, and that current symptomatic approaches are far from ideal, proof of principle of our trial would be an extremely important advance as it would not only have a beneficial impact on the health of many thousands of our veterans, but also it would substantially reduce the many negative economic effects of this ailment on the VA Health Care System.

Eligibility Criteria

Inclusion

Inclusion Criteria:

  1. Veterans 18-65 years old with GWI and chronic GI symptoms (abdominal pain, diarrhea,bloating) that started during their deployment in the Persian Gulf

  2. Veterans 18-65 years old with GWI and chronic GI symptoms (abdominal pain, diarrhea,bloating)

  3. increased intestinal permeability on the lactulose/mannitol permeability test (ratio >0.07)

  4. able and willing to cooperate with the study

Exclusion

Exclusion Criteria:

  1. current participation in another research protocol or unable to give informedconsent

  2. women with a positive urine pregnancy test or breastfeeding

  3. history of inflammatory bowel disease, lactose intolerance and/or celiac sprue

  • hydrogen breath test for bacterial overgrowth

5.

  • anti-endomysial antibody titer

  1. use of NSAIDs 2 weeks before or during the study

  2. known allergy to glutamine or whey protein

  3. abdominal surgery except for removal of gallbladder, uterus, or appendix >6 monthsprior to entry into the study

  4. Abnormal serum BUN and/or creatinine

  5. Mannitol recovery out of the normal range of 5-25 U/g

  6. history of kidney disease

  7. allergies to monosodium glutamate

  8. current use of anti-seizure medications

Study Design

Total Participants: 80
Treatment Group(s): 2
Primary Treatment: Control Arm
Phase:
Study Start date:
October 16, 2023
Estimated Completion Date:
July 31, 2027

Study Description

Since 2001, more than 2.2 million US veterans have served in Operation Enduring Freedom (OEF) in Afghanistan and Operation Iraqi Freedom (OIF) in Iraq. The Gulf Registry of the VA Environmental Epidemiology Service identified the majority of these veterans as having chronic health complaints of undetermined etiology. Among the symptoms most frequently reported by veterans with Gulf War Illness (GWI) were chronic fatigue, frequent or persistent headache, frequent or persistent muscle or joint pain, and gastrointestinal (GI) symptoms. GI symptoms (e.g., diarrhea, bloating, and abdominal pain) reported by these veterans accounted for most complaints. Indeed, up to 33% of veterans with GWI suffer from chronic GI symptoms.

The investigators have shown that veterans with GWI and GI symptoms have increased intestinal permeability that drives GI symptoms (Zhang et al., 2019). Our research group recently completed a clinical trial demonstrating the effectiveness of oral glutamine supplementation in diarrhea-predominant IBS patients with increased intestinal permeability (Zhou et al., 2019). The investigators now have obtained preliminary evidence that oral glutamine supplementation may restore intestinal permeability in veterans with GWI and GI symptoms. Based on these new findings, the investigators hypothesize that oral glutamine supplementation will improve the Symptom Severity Scale and restore intestinal permeability in veterans with GWI and chronic GI symptoms. The investigators propose to conduct a randomized, double-blind, placebo-controlled clinical trial studying oral glutamine supplementation compared to placebo in veterans with GWI and GI symptoms.

The human GI tract is the major site of glutamine utilization in the body. Glutamine is a major energy source for rapidly dividing intestinal mucosal cells of the digestive tract. Glutamine helps to protect the lining of the GI tract. Its depletion results in epithelial atrophy and a subsequent increase in intestinal permeability. Glutamine supplementation has been shown to decrease bacterial translocation and intestinal permeability after intestinal injury. Glutamine supplementation has also been shown to decrease intestinal permeability and improve GI function in patients with Crohn's disease, advanced esophageal cancer, or metastatic cancer undergoing radio chemotherapy. There are no published studies to date to support the use of glutamine for veterans with GWI and chronic GI symptoms.

However, given our published studies, preliminary data demonstrating restoration of intestinal permeability with oral glutamine therapy, and the mechanisms of action of glutamine on the GI tract, research testing whether oral glutamine is an effective therapy in veterans with GWI is needed. Given that there are no effective treatments for these veterans and that current treatment approaches are far from ideal, this proposed clinical trial would be extremely important as it would not only have a beneficial impact on the health of many of our veterans, but also it would substantially reduce the negative economic effects on the VA Health Care System.

Connect with a study center

  • Memphis VA Medical Center, Memphis, TN

    Memphis, Tennessee 38104-2127
    United States

    Active - Recruiting

Not the study for you?

Let us help you find the best match. Sign up as a volunteer and receive email notifications when clinical trials are posted in the medical category of interest to you.