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NCT Number: NCT05259904

Study to Improve Deployment Related Asthma by Using L-Citrulline Supplementation

Service men and women returning from deployment are significantly more likely to develop asthma and severe respiratory symptoms from airway obstruction. Why this happens is not well known, but exposure to diesel, burn pits, biomass smoke, and sandstorms are thought to play a role. Ultimately, patients with deployment related asthma develop a complex airway disease that does not respond well to standard asthma medications. Therefore, it is imperative that safe and affordable treatments that could improve quality of life and symptoms are studied.

It has been previously shown that adult patients with poorly controlled asthma have an abnormal regulation of an amino acid called L-arginine and airway nitric oxide (FeNO), a gaseous molecule normally produced in the airways of healthy people. In healthy people, nitric oxide is present in amounts that help keep the airways open. However, in some patients with asthma, nitric oxide and L-arginine are often low. The investigators' preliminary data in obese asthmatics show that L-citrulline, which is an amino acid that can be metabolized into L-arginine, improved lung function and asthma control, while increasing the levels of FeNO. This is potentially shifting the paradigm in how investigators think of asthma management, as rising FeNO is often thought of being a bad sign. Based on this, the study investigators hypothesize that an L-citrulline-based drug strategy will normalize nitric oxide metabolism, suppress oxidative inflammatory responses and improve airway function in obese patients with asthma. The study proposal presents a clinical trial approach to treat deployment related asthma patients using L-citrulline as an add-on therapy to improve asthma control. If this confirms the investigators' previous study results, the investigators will be in route for developing the only precision-based therapy available to treat this asthma phenotype. These study results will potentially show that L-citrulline is a safe, tolerable medication that can make a significant impact on the respiratory health of a large segment of our active and veteran population at a reasonable cost.

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Key information

Conditions

Post Deployment Related Asthma Asthma Bronchial Diseases Hypersensitivity Hypersensitivity, Immediate Immune System Diseases Lung Diseases Lung Diseases, Obstructive Respiratory Hypersensitivity Respiratory Tract Diseases

Age range

18 year–70 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 2

Primary location

National Jewish Health

Denver, Colorado, 80206, United States

Location status: Recruiting

Location contact

Cecile Rose, MD, MPH

PRINCIPAL_INVESTIGATOR

NJH SEALS Team

CONTACT

[email protected]

303-398-1748

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Adequate completion of informed consent process with written documentation
  • Male and female patients, 18 - 70 years old, inclusive
  • Meets criteria for deployment related asthma or DRA (New onset of persistent respiratory symptoms of cough, dyspnea, wheezing and/or chest tightness during or after post-9/11/2001 military deployment to Southwest Asia, accompanied by a post-bronchodilator increase in FEV1 ≥ 12% and an increase in FEV1 ≥ 200 milliliters on pulmonary function testing and/or methacholine challenge showing airways hyperresponsiveness with a 20 percent drop in FEV1 (PC[-20] FEV1) ≤ 16 mg/mL. ) Historical results from previous studies or documented in clinical records within the last 24 months are acceptable alternatives
  • Able to perform reproducible spirometry according to ATS criteria
  • All racial/ethnic backgrounds may participate
  • Smoking tobacco history ≤15 pack years and no smoking in the last 3 months
  • Suboptimal asthma control at baseline (ACQ ≥ 0.5 or ACT<19)

Exclusion criteria

  • Respiratory tract infection within the 4 weeks prior to Visit 0
  • Pulmonary-related ER visit within the 4 weeks prior to Visit 0
  • Oral or systemic corticosteroid burst (for any indication) within the 4 weeks prior to Visit 0. One-time doses, such as intra-articular injections into a shoulder or knee joint, require a 2-week washout prior to Visit 0
  • Significant concomitant medical illness at the discretion of the PI, including (but not limited to) heart disease, cancer, uncontrolled diabetes, other chronic lung diseases
  • Chronic renal failure (creatinine > 2.0) at Visit 0 (Associated with higher ADMA levels)
  • Positive urine (or serum) pregnancy test at Visit 0 or at any time during the study
  • Intolerance or allergy to L-arginine or L-citrulline
  • Concomitant use of PDE5 drugs or oral mononitrates
  • Unable or unlikely to complete study assessments in the opinion of the Investigator
  • Study intervention poses undue risk to patient in the opinion of the Investigator

Treatment and study plan

L-citrulline

Drug

7 weeks of treatment with 15 g/day of orally administered (powder form mixed with water) L-citrulline

Placebo

Drug

7 weeks of treatment with orally administered matching placebo (to 15 g/day of L-citrulline)

Primary outcomes

  1. Change in Asthma Control Questionnaire

    Time frame: Through study completion, up to 22 weeks

    To determine L-citrulline efficacy, reduction in questionnaire scores determined

  2. Change in FeNO values

    Time frame: Through study completion, up to 22 weeks

    To determine L-citrulline efficacy, increase in FeNO values determined

Study contacts

Contact information is provided by the study sponsor or research team.

University of Colorado Asthma and Research Education Team

CONTACT

[email protected]

1-844-365-0852

Sponsors and collaborators

Lead sponsor

University of Colorado, Denver

Other

Collaborators

  • National Jewish Health
  • United States Department of Defense

Registry information

Official study title

Study to Improve dEployment Related Asthma by Using L-citrulline Supplementation (SEALS)

Acronym: SEALS

Important dates

Study start
2023
Primary completion
2028
Study completion
2028
First posted
Mar 2, 2022
Registry last updated
Apr 6, 2023

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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