- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03049111
Screening Inhaled Allergen Challenge for Dermatophagoides Farinae (MiteScreen)
Study Overview
Detailed Description
Asthma is an increasingly common chronic illness among children and adults, and allergen exposure is among the most common common triggers for asthma exacerbations. Exacerbations of allergic asthma are characterized by an early phase response (EPR), mediated by release of preformed mediators like histamine from mast cells, and a late phase response (LPR) 3-7 hours later mediated by chemokines and cytokines that attract leukocytes such as neutrophils and eosinophils to the airways, increase mucus production, trigger airway smooth muscle contraction, and result in airway constriction and airway hyperreactivity (AHR). The LPR does not occur in the absence of an EPR. The LPR is thought to be predominantly responsible for the symptoms associated with acute exacerbations of allergic asthma and is often used as the measure of efficacy in trials of asthma therapeutics.
This group has taken a particular interest in targeting an inflammatory cytokine, Interleukin-1β, involved in both the early and late phase asthmatic responses to inhaled allergen in allergic asthmatics. In the lung, interleukin 1 beta (IL-1β) is produced by numerous cell types (including epithelial cells, macrophages, neutrophils, eosinophils, and mast cells), where it signals through its receptor to induce transcription of pro-inflammatory genes (17-19). IL-1β is increased in bronchoalveolar lavage fluid from persons with symptomatic asthma vs. those with asymptomatic asthma; likewise, immunohistochemistry of bronchial biopsies of allergic asthmatics reveal increased expression of IL-1β in both bronchial epithelial cells and macrophages. Previous studies in animal and in vitro models demonstrate that IL-1β can directly impact three aspects of an airway inflammatory response: 1). granulocyte (neutrophil/eosinophil) recruitment; 2). non-specific (23, 24) and allergen-specific airway reactivity; and 3). production and clearance of airway mucous. Supporting literature and preliminary studies in human subjects further promote the study of IL-1 blockade for mitigating features of acute allergen-induced asthma exacerbation.
The role of IL-1 in allergen challenge models has not been fully defined. In a study examining 12 asthmatics allergic to D. farinae at this research center, we found that 9/12 asthmatics had a greater than 10% reduction in forced expiratory volume in 1 second (FEV1) after inhaled dust mite challenge. These individuals were considered responders. It was notable that when comparing post-allergen levels of cytokines between responders and non-responders there was a much greater concentration of IL-1β in post-challenge sputum from responders vs. nonresponders, Furthermore, within the responders, post challenge IL-1β also significantly correlated with sputum eosinophil concentrations (r=0.83, P<0.05) and neutrophil concentrations (r=0.89, P<0.05) 24 hours after allergen challenge. These data suggest that IL-1β may play a role in both immediate airway hyperresponsiveness and the late phase recruitment of inflammatory cells (neutrophils and eosinophils) after inhaled allergen challenge.
In order to better understand the role of IL-1β in allergen-induced airway inflammation, induced sputum will be obtained to determine if higher baseline sputum IL-1β concentrations or larger increases in IL-1β following allergen challenge impact non-specific airway hyperresponsiveness (via methacholine challenge), sputum granulocyte recruitment (neutrophil and eosinophil counts and exhaled nitric oxide (eNO), a marker of airway eosinophilia), or changes in expression of inflammatory or allergy-related genes. To this last point, little is known about the mechanisms contributing to response patterns in allergic asthmatics undergoing allergen challenge. Changes in gene expression occurring during the window of time between the EPR and LPR, as these expression changes may dictate whether or not a LPR occurs or to what extent it occurs.
The goal of this screening protocol is to identify subjects who exhibit both an EPR and LPR and who will be eligible for enrollment in the yet to be developed Il-1β protocols. Subjects will undergo a baseline methacholine challenge to establish reactivity, then allergen exposure, followed 24 hours later by methacholine challenge.
Study Type
Enrollment (Actual)
Phase
- Early Phase 1
Contacts and Locations
Study Locations
-
-
North Carolina
-
Chapel Hill, North Carolina, United States, 27599-7310
- UNC Center for Environmental Medicine, Asthma and Lung Biology
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria
- Age range 18-45 years, inclusive
- FEV1 of at least 80% of predicted and forced expiratory volume in 1 second/forced vital capacity (FEV1/FVC) ratio of at least 0.7 (without use of bronchodilator medications for 8 hours or long acting beta agonists for 24 hours), consistent with lung function of persons with no more than mild intermittent or mild persistent asthma.
- Physician diagnosis of asthma
- Positive methacholine inhalation challenge as performed in the separate screening protocol within the prior 12 months (defined as provocative concentration of methacholine of 10 mg/ml or less producing a 20% fall in FEV1 (PC20 methacholine)
- Allergic sensitization to house dust mite (D. farinae) as confirmed by positive immediate skin prick test response
- Negative pregnancy test for females who are not s/p hysterectomy with oophorectomy or who have been amenorrheic for 12 months or more.
- Oxygen saturation of >94% and blood pressure within the following limits: (Systolic between 150-90 mmHg, Diastolic between 90-60 mmHg).
Exclusion Criteria
Clinical contraindications:
- Any chronic medical condition considered by the PI as a contraindication to participation in the study including significant cardiovascular disease, diabetes, chronic renal disease, chronic thyroid disease, history of chronic infections or immunodeficiency.
- Physician directed emergency treatment for an asthma exacerbation within the preceding 12 months.
- Exacerbation of asthma more than 2x/week which could be characteristic of a person of moderate or severe persistent asthma as outlined in the current NHLBI guidelines for diagnosis and management of asthma.
- Daily requirements for albuterol due to asthma symptoms (cough, wheeze, chest tightness) which would be characteristic of a person of moderate or severe persistent asthma as outlined in the current NHLBI guidelines for diagnosis and management of asthma (not to include prophylactic use of albuterol prior to exercise).
- Viral upper respiratory tract infection within 4 weeks of challenge.
- Any acute infection requiring antibiotics within 6 weeks of exposure or fever of unknown origin within 6 weeks of challenge.
- Severe asthma
- Mental illness or history of drug or alcohol abuse that, in the opinion of the investigator, would interfere with the participant's ability to comply with study requirements.
- Cigarette smoking >1 pack per month
- Nighttime symptoms of cough or wheeze greater than 1x/week at baseline (not during a clearly recognized viral induced asthma exacerbation) which would be characteristic of a person of moderate or severe persistent asthma as outlined in the current NHLBI guidelines for diagnosis and management of asthma.
- Allergy/sensitivity to study drugs or their formulations
- Known hypersensitivity to methacholine or to other parasympathomimetic agents
- History of intubation for asthma
- Unwillingness to avoid coffee, tea, cola drinks, chocolate, or other foods containing caffeine after midnight on the days that methacholine challenge testing is to be performed.
- Unwillingness to use reliable contraception if sexually active (IUD, birth control pills/patch, condoms).
- Pregnancy or nursing a baby. Female volunteers will be asked to use effective birth control (stable regimen of hormonal contraceptive use for at least 3 months, intrauterine device placement, tubal ligation or endometrial ablation for at least 3 months through at least one week after study completion) and will provide a urine sample to test for pregnancy on study days. If the test is positive or the subject has reason to believe she may be pregnant, she will be dismissed from the study. Women who have been amenorrheic for 12 months may participate. Male volunteers will be asked to use condoms for the duration of the study through at least one week after study completion.
Usage of the following medications:
- Use of systemic steroid therapy within the preceding 12 months for an asthma exacerbation. All use of systemic steroids in the last year will be reviewed by a study physician.
- Subjects who are prescribed daily inhaled corticosteroids, cromolyn, or leukotriene inhibitors (Montelukast or Zafirlukast) will be required to discontinue these medications at least 2 weeks prior to their screening visit.
- Use of daily theophylline within the past month.
- Daily requirement for albuterol due to asthma symptoms (cough, wheeze, chest tightness) which would be characteristic of a person of moderate or severe persistent asthma as outlined in the current NHLBI guidelines for diagnosis and management of asthma. (Not to include prophylactic use of albuterol prior to exercise).
- Use of any immunosuppressant therapy within the preceding 12 months will be reviewed by the study physician.
- Receipt of Live Attenuated Influenza Vaccine (LAIV), also known as FluMist®, or any other live viral vaccine within the prior 30 days, or any vaccine for at least 5 days
- Use of beta blocking medications
- Antihistamines in the 5 days prior to allergen challenge
- Routine use of NSAIDs, including aspirin.
Physical/laboratory indications:
- Abnormalities on lung auscultation
- Temperature >37.8 C
- Oxygen saturation of <94%
- Systolic BP>150 mmHg or <90 mmHg or diastolic BP>90 mmHg or <60 mmHg
- Inability or unwillingness of a participant to give written informed consent.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: BASIC_SCIENCE
- Allocation: NA
- Interventional Model: SINGLE_GROUP
- Masking: NONE
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
EXPERIMENTAL: Inhaled Allergen Challenge
Der f sensitive, mild asthmatic subjects will undergo inhaled allergen challenge
|
Inhalation of Der f in mild asthmatics who are sensitive to Der f.
Other Names:
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Number of Participants With Decline in FEV1 ≥ 10% From Pre-challenge During 3-10 Hours Post-allergen Challenge
Time Frame: Pre-challenge to 3-10 hours post-challenge
|
Participants will undergo an inhaled allergen challenge to identify those with a measurable late phase response (LPR) to inhaled house dust mite allergen.
Pre-challenge FEV1 will be measured prior to administration of the allergen challenge.
The presence of an LPR will be defined as a decline in FEV1 of ≥10% from pre-challenge values 3-10 hours post-challenge.
|
Pre-challenge to 3-10 hours post-challenge
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Change in Concentration of IL-1β in Induced Sputum
Time Frame: Pre-challenge to 24 hours post-challenge
|
Participants provided induced sputum pre-allergen challenge and again at 24 hours post-allergen challenge.
IL-1β concentrations in the sputum will be determined via ELISA.
|
Pre-challenge to 24 hours post-challenge
|
Change in Percentage of Eosinophils in Induced Sputum
Time Frame: Pre-challenge to 24 hours post- challenge
|
Percentage %eosinophils post-challenge minus pre-challenge values
|
Pre-challenge to 24 hours post- challenge
|
Mucins in Sputum
Time Frame: Baseline and 24 hours post- inhalation challenge
|
Sputum mucins will be measured at baseline, and again at 24 hours following inhaled allergen challenge
|
Baseline and 24 hours post- inhalation challenge
|
Maximum Percentage Change in FEV1 From Pre-challenge Values at 3-10 Hours Post-challenge
Time Frame: Pre-challenge to 3-10 hours post-challenge
|
FEV1 will be measured prior to administration of the inhaled allergen challenge.
The maximum change in FEV1 that occurs during the late phase (3-10 hours after challenge) will be determined.
[(lowest FEV1 value recorded post-challenge) - (pre-challenge FEV1 value)/ pre-challenge FEV1 value] *100
|
Pre-challenge to 3-10 hours post-challenge
|
Change in Airway Hyperresponsiveness Measured by Difference in Methacholine Dose Required to Produce a ≥20% Fall in FEV1 (PC20)
Time Frame: Baseline and 24 hours post-challenge
|
Participants will undergo a methacholine challenge to assess airway hyper-responsiveness at baseline.
Changes in methacholine reactivity from baseline to 24 hours post-allergen challenge will be determined.
|
Baseline and 24 hours post-challenge
|
Change in Exhaled Nitric Oxide (eNO) Levels
Time Frame: pre-challenge to 24 hours post-challenge
|
eNO levels will be measured pre-challenge, and 24 hours post-challenge.
|
pre-challenge to 24 hours post-challenge
|
Other Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Heart Rate Variability (HRV)
Time Frame: Pre and immediately post challenge
|
HRV with Spacelabs technology will be measured 24 hours pre and during inhalation challenge
|
Pre and immediately post challenge
|
Collaborators and Investigators
Collaborators
Study record dates
Study Major Dates
Study Start (ACTUAL)
Primary Completion (ACTUAL)
Study Completion (ACTUAL)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (ESTIMATE)
Study Record Updates
Last Update Posted (ACTUAL)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Other Study ID Numbers
- 16-2131
- 1R01HL135235-01A1 (NIH)
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
Clinical Trials on Asthma
-
Vanderbilt University Medical CenterNot yet recruitingAsthma in Children | Asthma Attack | Asthma Acute | Acute Asthma Exacerbation | Asthma; StatusUnited States
-
University of California, San FranciscoCompletedAsthma in Children | Asthma Attack | Asthma Acute | Asthma ChronicUnited States
-
SingHealth PolyclinicsNot yet recruitingAsthma | Asthma in Children | Asthma Attack | Asthma Acute | Asthma Chronic
-
Johann Wolfgang Goethe University HospitalCompleted
-
Universita di VeronaCompleted
-
Parc de Salut MarActive, not recruitingAsthma in Children | Persistent Asthma | Asthma ExacerbationSpain
-
Forest LaboratoriesCompleted
-
Brunel UniversityKarolinska InstitutetUnknown
-
Value Outcomes Ltd.AstraZenecaCompletedAsthma, Bronchial | Bronchial Asthma | Asthma Chronic | Asthma; EosinophilicCzechia
Clinical Trials on Der f
-
University of North Carolina, Chapel HillNational Heart, Lung, and Blood Institute (NHLBI)Terminated
-
University Rehabilitation Institute, Republic of...CompletedAmputation; Traumatic, Leg, Lower, Between Knee and AnkleSlovenia
-
Sol-Gel Technologies, Ltd.Completed
-
Bausch Health Americas, Inc.CompletedSickle Cell DiseaseUnited States, Canada, Kenya
-
University of HawaiiNational Cancer Institute (NCI); National Institutes of Health (NIH); University...Recruiting
-
A. Vogel AGTerminatedMenopausal Hot FlushesSwitzerland
-
Ludwig-Maximilians - University of MunichREFUGIO MunichCompleted
-
Clinique Romande de ReadaptationRecruitingHand Injuries and DisordersSwitzerland
-
Chang Gung Memorial HospitalCompleted
-
Northwell HealthCompletedNeuroendocrine TumorsUnited States