Assessing Neuroinflammation in GWI Using MRS

Study Overview
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Brief Summary
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The primary aim of this study is to determine if Gulf War Illness (GWI) likely involves neuroinflammation. The investigators hypothesize that GWI involves neuroinflammation. By assessing the five neuroinflammatory outcomes across the brain, the investigators can determine if there are focal or global signs of one or more neuroinflammatory markers in the brains of individuals with GWI. This neuroimaging technique may allow investigators and others to detect cases of GWI neuroinflammation, which would improve treatment decisions as well as the development of new targeted therapies. It is an ideal diagnostic tool because it has low patient risk, is noninvasive, can be used repeatedly in longitudinal studies, provides whole-brain coverage, yields multiple independent markers of inflammation, and can be employed at most hospitals and research neuroimaging suites.

Detailed Description
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This proposal is for a Tier 1 (Discovery) study that uses a human, cross-sectional, observational neuroimaging approach to measure neuroinflammation in Gulf War Illness (GWI). A whole-brain magnetic resonance spectroscopic imaging (MRSI) scan will be used to detect multiple markers of neuroinflammation in 30 individuals with GWI and 30 healthy veteran controls. The investigators have fully tested the MRSI scan in several patient groups, and have found strong evidence of neuroinflammation in fibromyalgia and chronic fatigue syndrome - conditions the investigators believe involve abnormal central immune system processing. The investigators have not, however, performed the scan on individuals with GWI. The discovery study will allow investigators to transfer this existing technology to the GWI field. This project meets the core Special Interest of investigating dysregulation between the immune and neurological systems in the brain. The investigators' central hypothesis is that GWI involves chronic neuroinflammation. The symptoms of GWI (e.g. fatigue, musculoskeletal pain, sleep disturbances, and cognitive dysfunction) overlap heavily with classic cytokine-induced sickness responses. In the case of GWI, microglial cells in the brain can be pushed into a hypersensitized state by toxins or abnormal immune challenges, leading to chronic overproduction of pro-inflammatory factors that result in the primary symptoms of GWI. To test the central hypothesis, it is necessary to measure neuroinflammation in humans in vivo. However, most techniques are too invasive for use in living individuals. To address that problem, the investigators use an MRSI scan which provides metabolite concentrations in 4,000 separate voxels, giving whole-brain coverage. The scan yields measurements for: Myo-inositol (a marker of glial cell proliferation), lactate (a product of anaerobic metabolism), choline (a sign of cellular breakdown), and N-acetylaspartate (a marker of neuronal health). The scan also provides absolute brain temperature, which is shown to be elevated with severe neuroinflammation. The five main outcomes are as follows: Myo-inositol (MI): Higher values represent greater microglia proliferation or gliosis. Lactate (Lac): Higher values represent more severe inflammatory activity. Choline (Cho): Higher values indicate greater cell turnover (inflammation, gliosis, or demyelination). NAA: Lower values represent neurodegeneration. Temperature: Higher values represent greater neuroinflammation. Metabolite and water-reference data will be analyzed using the MIDAS package and thermometry extension41. Absolute brain temperatures (in °C) within each voxel will be calculated by measuring the distance of the temperature-invariant NAA peak from the temperature-variant water peak using the formula: Tbrain = -102.76 × Δwater-NAA + 310.5°C, which has been validated in our scanner to produce reliable readings. Temperature will be expressed on absolute values in °C.

Official Title
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Assessing Neuroinflammation in Gulf War Illness With Whole-Brain Magnetic Resonance Spectroscopy

Conditions
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Gulf War Syndrome

Intervention / Treatment
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* Procedure: Magnetic Resonance Spectroscopic Imaging
* Procedure: Blood draw


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Between the ages of 46 and 70 Veterans who meet the Kansas inclusion criteria .The Kansas Inclusion Criteria are a set of the most frequently reported symptoms experienced by Gulf War veterans. This frequency and severity of the symptoms reported by the participant indicate whether the person has Gulf War Illness or not. The Kansas Inclusion Criteria is the gold standard for identifying veterans with GWI in the field. The criteria are attached. Present in Persian Gulf between 1990 and August 1991 Forward deployed (in Iraq or Kuwait) Exclusion Criteria: Usage of experimental medications, opioid analgesics, psychostimulants (except caffeine), or benzodiazepines Uncontrolled diabetes, autoimmune disorders, and thyroid disorders. Major cardiovascular illness, cancer, or have any contraindications for MRI (including metallic implants or claustrophobia)

Ages Eligible for Study
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Minimum Age: 46 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Healthy Control<br>The healthy control group are men ages 46-70 who were present in the Persian Gulf War between 1990 and August 1991. This cohort do not experience any Gulf War Illness symptoms. | Procedure: Magnetic Resonance Spectroscopic Imaging<br>* MRSI is a non invasive imaging technique used to detect neuroinflammation.<br>* Other names: MRSI;Procedure: Blood draw<br>* Blood will be drawn to assess systemic inflammation in Gulf War verterans.<br>|
| Gulf War Illness<br>The GWI cohort are men ages 46-70 who were present in the Persian Gulf War between 1990 and August 1991. The men in this cohort will also meet the Kansas Inclusion Criteria for GWI. | Procedure: Magnetic Resonance Spectroscopic Imaging<br>* MRSI is a non invasive imaging technique used to detect neuroinflammation.<br>* Other names: MRSI;Procedure: Blood draw<br>* Blood will be drawn to assess systemic inflammation in Gulf War verterans.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Concentration of myoinositol in the brain | The concentration of myoinositol will be measured in the brain using MRI as a measure of neuroinflammation. This will be measured in both the control and experimental groups. | 20 minutes | 
| Concentration of lactate in the brain | The concentration of lactate will be measured in the brain using MRI as a measure of neuroinflammation. The concentration will be expressed in water-normed Institutional Units. This will be measured in both the control and experimental groups. | 20 minutes | 
| Concentration of choline in the brain | The concentration of choline will be measured in the brain using MRI as a measure of neuroinflammation. This will be measured in both the control and experimental groups. | 20 minutes | 
| Concentration of N-acetylaspartate in the brain | The concentration of N-acetylaspartate will be measured in the brain using MRI as a measure of neuroinflammation. This will be measured in both the control and experimental groups. | 20 minutes | 
| Temperature in the brain | The temperature of the brain will be measured using MRI as a measure of neuroinflammation. This will be measured in both the control and experimental groups. | 20 minutes | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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neuroinflammation, Gulf War Illness