Study Results
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Basic Information
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RECRUITING
24 participants
OBSERVATIONAL
2011-09-01
2024-12-31
Brief Summary
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The epithelial cell is the cell that lines the surface of your airways from your nose down to your lungs, and is also the cell type that gets infected by rhinovirus. At present, it is thought that the virus causes symptoms by changing epithelial cell biology in a way that causes airway inflammation. Some of these inflammatory molecules are also thought to cause scarring (remodeling) of the airways, which over time, may lead to a loss of lung function. In order to examine how the virus causes inflammation, many earlier studies have used experimental infection with the virus and have measured various markers of inflammation.
The purpose of this study is to compare the levels of inflammatory and remodeling products in the airways of study participants with mild to moderate asthma and healthy, non-asthmatic subjects after infection with rhinovirus (the common cold virus).
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Detailed Description
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A potential limitation of the in vivo studies reported by us to date is that these have involved healthy, non-asthmatic research participants studied during naturally-acquired HRV infections. Such studies are subject to seasonal variability and are difficult to perform in well-defined study populations, due to uncertainty regarding the onset of infection and the kinetics of subsequent host inflammatory responses. We therefore plan perform a Phase II clinical trial in which we will perform experimental HRV infections in subjects with mild-moderate asthma and in healthy control subjects. This will allow us to accurately study the kinetics of HRV-induced inflammatory and remodeling responses in a well characterized cohort of asthmatic subjects and compare these outcomes to those in a healthy, non-asthmatic control cohort. The primary study outcome will be to determine if alterations in relevant airway remodeling growth factors differ between healthy controls and asthmatic subjects pre- and post-HRV infection. These growth factors will be assessed in bronchoalveolar lavage fluid (BALF) and endobronchial biopsy tissues and correlated with viral titres in both nasal lavage and BALF.
Airway epithelial cells are the primary site of HRV infection, and are the only cell type in which HRV has been detected thus far during in vivo infections. Moreover, there is unequivocal evidence that, following experimental nasal HRV inoculation, virus spreads to infect lower airway epithelial cells, providing a strong biological rationale for the proposed clinical study. HRV only replicate productively in vivo in humans and higher primates and even though rhinoviruses replicate in higher primates (chimpanzees and gibbons), infected animals do not show symptoms. Although two recent publications have reported induction of airway inflammation following exposure of mice to massive doses of unpurified HRV, these responses were transient with little evidence of sustained viral replication. Consequently, we hold the view that HRV only causes relevant infections in vivo in humans and it is for that reason that we continue to focus exclusively on human model systems for all our experimental work. A better understanding of in vivo HRV-induced airway remodeling mediators, and the mechanisms that regulate them, should extend our understanding of the role of HRV infections in the pathogenesis of airway remodeling in asthma.
Clinical studies involving the experimental infection of volunteers with rhinovirus have been conducted for more than 40 years. Challenge pools of rhinovirus for these experiments have generally been produced and safety tested according to guidelines published in 1964 and updated in 1992. The challenge pools produced under these guidelines appeared to be safe. Multiple studies have been conducted over this 40-year period in several countries. Dr. Proud has over 20 years of experience in conducting experimental HRV infection protocols. In the 40 years of such studies, it is reasonable to estimate that some 10,000 volunteers have been challenged worldwide to date, and no serious complications attributable to the viral infection have been detected. Moreover, nearly a dozen experimental HRV infection studies have been done in subjects with mild-moderate asthma over the past decade without serious complications. While these studies have contributed substantially to our understanding of rhinovirus-induced asthma symptoms, as well as of host inflammatory and antiviral responses, none have yet looked at the effects of experimental HRV infection on indices of airway remodeling.
Therefore, as a natural extension of our current research program and, in keeping with our expertise in HRV-related research, we now plan to perform this experimental rhinovirus infection study. We plan to use a US Food and Drug Administration (FDA) approved Good Manufacturing Practices (GMP)-grade HRV-39 (a gift from Dr. Ronald B. Turner, University of Virginia) for our proposed study. Use of this GMP-grade HRV-39 viral stock ensures compliance with recent regulatory agency requirements which, beginning in 2001, have mandated that HRV preparations used for human inoculation be made under Good Manufacturing Practices (GMP). This proposed clinical study will allow us to address fundamental questions regarding the nature, kinetics and potential mechanisms of upper and lower airway inflammatory responses in subjects with well-controlled mild-moderate asthma and in healthy, non-asthmatic control subjects; a better understanding of these mechanisms may lead to new paradigms in the treatment of virally-induced airway remodeling and asthma exacerbations.
Conditions
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Study Design
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CASE_CONTROL
PROSPECTIVE
Study Groups
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Asthma Cohort
Subjects with well-controlled, mild-moderate asthma (≥12% post-bronchodilator reversibility or PC20 methacholine \<16mg/mL at screening or within past 5 years).
Subjects will be inoculated with a total dose of 1000 tissue culture-infective dose 50% (TCID50) of rhinovirus (HRV) 39. The inoculum is diluted as appropriate in lactated Ringer's solution and delivered via a two step procedure: 0.25 ml per nostril is administered by pipette while the subject tilts their head back. It is anticipated that subjects will develop mild to moderate symptoms that are transient (lasting 3-7 days) and typically consist of nasal congestion, throat irritation, malaise and increased mucoid secretions. Subjects will record cold symptoms twice daily, using a diary card listing 8 symptoms, each of which are scored 0 to 3 on a basis of severity.
Subjects will only be inoculated with HRV-39 once at Visit 5.
HRV-39
We will use a US Food and Drug Administration (FDA) approved Good Manufacturing Practices (GMP)-grade HRV-39 for our proposed study. Use of this GMP-grade HRV-39 viral stock ensures compliance with recent regulatory agency requirements which, beginning in 2001, have mandated that HRV preparations used for human inoculation be made under Good Manufacturing Practices (GMP). This proposed clinical study will allow us to address fundamental questions regarding the nature, kinetics and potential mechanisms of upper and lower airway inflammatory responses in subjects with well-controlled mild-moderate asthma and in healthy, non-asthmatic control subjects; a better understanding of these mechanisms may lead to new paradigms in the treatment of virally-induced airway remodeling and asthma exacerbations.
Healthy, Non-asthmatic Cohort
Healthy non-asthmatic control subjects.
Subjects will be inoculated with a total dose of 1000 tissue culture-infective dose 50% (TCID50) of rhinovirus (HRV) 39. The inoculum is diluted as appropriate in lactated Ringer's solution and delivered via a two step procedure: 0.25 ml per nostril is administered by pipette while the subject tilts their head back. It is anticipated that subjects will develop mild to moderate symptoms that are transient (lasting 3-7 days) and typically consist of nasal congestion, throat irritation, malaise and increased mucoid secretions. Subjects will record cold symptoms twice daily, using a diary card listing 8 symptoms, each of which are scored 0 to 3 on a basis of severity.
Subjects will only be inoculated with HRV-39 once at Visit 5.
HRV-39
We will use a US Food and Drug Administration (FDA) approved Good Manufacturing Practices (GMP)-grade HRV-39 for our proposed study. Use of this GMP-grade HRV-39 viral stock ensures compliance with recent regulatory agency requirements which, beginning in 2001, have mandated that HRV preparations used for human inoculation be made under Good Manufacturing Practices (GMP). This proposed clinical study will allow us to address fundamental questions regarding the nature, kinetics and potential mechanisms of upper and lower airway inflammatory responses in subjects with well-controlled mild-moderate asthma and in healthy, non-asthmatic control subjects; a better understanding of these mechanisms may lead to new paradigms in the treatment of virally-induced airway remodeling and asthma exacerbations.
Interventions
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HRV-39
We will use a US Food and Drug Administration (FDA) approved Good Manufacturing Practices (GMP)-grade HRV-39 for our proposed study. Use of this GMP-grade HRV-39 viral stock ensures compliance with recent regulatory agency requirements which, beginning in 2001, have mandated that HRV preparations used for human inoculation be made under Good Manufacturing Practices (GMP). This proposed clinical study will allow us to address fundamental questions regarding the nature, kinetics and potential mechanisms of upper and lower airway inflammatory responses in subjects with well-controlled mild-moderate asthma and in healthy, non-asthmatic control subjects; a better understanding of these mechanisms may lead to new paradigms in the treatment of virally-induced airway remodeling and asthma exacerbations.
Eligibility Criteria
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Inclusion Criteria
* Between ≥18 and ≤ 65 years of age
* Objective evidence of variable airflow limitation (≥12% and at least 200mL post-bronchodilator reversibility from baseline) and airway hyperresponsiveness (PC20 methacholine \<16mg/mL) at screening or within past 5 years
* Spirometry at baseline shows FEV1 ≥ 60% of predicted; FEV1/FVC ≥ 0.40
* Atopic, as evidenced by positive skin prick tests to ≥1 common aero-allergen, where positive is defined by a wheal of ≥2 mm greater than the negative control
* Not be exposed to sensitizing seasonal allergens for at least 4 weeks before visit 2
* Asthma symptoms controlled by either inhaled beta 2-agonists alone, or by low or moderate dose (≤800 μg of budesonide or equivalent per day) inhaled corticosteroid (ICS) administered either as monotherapy or in a fixed-dose combination with a long-acting beta 2-agonist (LABA)
* Be a non-smoker for ≥1 year and have a lifetime ≤ 10 pack-year smoking history of smoking
* In good general health (other than asthma) without clinically significant medical history of other comorbidities, and a BMI of ≤ 35 kg/m2.
Healthy, Non-asthmatic Cohort
* Male or female volunteers in good general health, without clinically significant medical history and a BMI of ≤ 35 kg/m2
* Between ≥18 and ≤ 65 years of age
* Non-asthmatic, as defined by history and normal spirometry (FEV1 ≥80% predicted; FEV1/FVC ≥ 0.75)
* Normal airway responsiveness (PC20 methacholine not detected at, or less than, 16 mg/mL)
* Non-atopic, as determined by skin prick tests to common aero-allergens, where a positive test is defined as a wheal of ≥2 mm greater than the negative control.
* Be a non-smoker for ≥1 year and have a lifetime ≤ 10 pack-year smoking history of smoking
* Willing to participate in study and be able to provide written consent prior to starting the study.
Exclusion Criteria
* Current pregnancy or positive urine pregnancy test at screening
* Use of any of the following medications: antihistamines, leukotriene antagonists, inhaled anticholinergics, non-steroidal anti-inflammatories, antibiotics, and over the counter 'cold' and influenza remedies, in preceding 4 weeks prior to visit 2.
* Current acute or chronic illness (including infection) or recent recovery (within 4 weeks of visit 3) from acute illness which could, in the opinion of the Investigator, alter inflammatory responses (e.g., flu, cold or other respiratory infection, etc.).
* Autoimmune disease or immunodeficiency
* Any other significant concomitant medical issue, or findings on physical examination or medical history that, in the opinion of the study physician, may pose additional risks from participation in the study (including undergoing bronchoscopy), or which may impact the quality or interpretation of the data obtained from the study.
* Inability or unwillingness of a potentially eligible study participant to give written informed consent.
* Unable or unwilling to adhere to protocol-defined study visit schedule and/or other protocol requirements.
18 Years
65 Years
ALL
Yes
Sponsors
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University of Calgary
OTHER
Responsible Party
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Locations
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University of Calgary
Calgary, Alberta, Canada
Countries
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Facility Contacts
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Curtis Dumonceaux
Role: primary
References
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Leigh R, Oyelusi W, Wiehler S, Koetzler R, Zaheer RS, Newton R, Proud D. Human rhinovirus infection enhances airway epithelial cell production of growth factors involved in airway remodeling. J Allergy Clin Immunol. 2008 May;121(5):1238-1245.e4. doi: 10.1016/j.jaci.2008.01.067. Epub 2008 Mar 19.
Tacon CE, Wiehler S, Holden NS, Newton R, Proud D, Leigh R. Human rhinovirus infection up-regulates MMP-9 production in airway epithelial cells via NF-kappaB. Am J Respir Cell Mol Biol. 2010 Aug;43(2):201-9. doi: 10.1165/rcmb.2009-0216OC. Epub 2009 Sep 25.
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Other Identifiers
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ARRA
Identifier Type: -
Identifier Source: org_study_id
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