- ICH GCP
- Registre américain des essais cliniques
- Essai clinique NCT00631254
CysLT1-r Expression Following Allergen Exposure in Asthma and Allergic Rhinitis
Modulation of the CysLT1-r Expression Following Allergen Exposure in Non Asthmatic Subjects With Allergic Rhinitis and Mild Allergic Asthmatic Subjects Using the Induced Sputum Technique.
Cysteinyl leukotrienes (CysLTs) play an important role in asthma. CysLTs exert most of their bronchoconstrictive and pro-inflammatory effects through activation of the CysLT1-r. As allergic rhinitis appears to be a predisposing factor in the development of asthma and as CysLT-receptors seem to be implicated in the first steps of asthma manifestations, we think it would be of interest to determine if the CysLT1-r is a key mediator in the progression from allergic rhinitis to asthma. We believe it would be interesting to study the expression of the CysLT1-r
Our goal is to assess baseline, as well as variations following allergen bronchoprovocations, in the expression of the CysLT1-r in mild asthmatic subjects compared with non asthmatic subjects with allergic rhinitis.
Our hypothesis is that there will be a higher baseline expression of the CysLT1-r in asthmatic subjects compared with allergic rhinitis subjects and that allergen bronchoprovocations will induce an increase in the expression of the CysLT1-r in both groups.
Aperçu de l'étude
Statut
Les conditions
Intervention / Traitement
Description détaillée
We will recruit mild allergic asthmatic subjects and non asthmatic subjects with allergic rhinitis. On a baseline visit, allergy skin prick tests, spirometry, methacholine bronchoprovocation and induced sputum (IS) with differential leukocyte count will be obtained.
In a second step, mild asthmatic subjects will undergo conventional bronchial allergen challenge. IS will be obtained at 6h (corresponding to the late asthmatic response) and 24h following the challenge. The rhinitic subjects and asthmatic subjects will undergo a 4-day low dose allergen bronchial challenge as well as a nasal allergen challenge. Sputum samples will be obtained following days 2 and 4 of the low dose challenge and one week later, and 24h following nasal challenge.
Induced sputum will be analyzed for differential cell count. Total mRNA will be extracted from IS cells and used for RT-PCR.
Type d'étude
Inscription (Anticipé)
Phase
- N'est pas applicable
Contacts et emplacements
Lieux d'étude
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Quebec, Canada, G1V 4G5
- Recrutement
- Centre de recherche de l'Hopital Laval
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Critères de participation
Critère d'éligibilité
Âges éligibles pour étudier
Accepte les volontaires sains
Sexes éligibles pour l'étude
La description
Inclusion Criteria:
- To have a positive reaction to one or more allergen on prick tests.
- Non smokers
- No respiratory track infection for at least one month prior to the study.
- Asthmatic subjects using only inhaled beta-2 agonists on an as needed basis for their asthma treatment.
- Asthmatic subjects with a history of asthma of at least 6 months.
- Asthmatic subjects with PC20 methacholine lower or equal to 8 mg/ml.
- Allergic rhinitic subjects never experienced any asthma symptoms or took any asthma medication in the past.
- Allergic rhinitic subjects with a PC20 methacholine higher than 16 mg/ml.
Exclusion Criteria:
- Smokers or ex smokers less than 6 months or more than 10 pack-years.
- Asthmatic subjects using or used in the past 3 months inhaled or oral corticosteroids.
Plan d'étude
Comment l'étude est-elle conçue ?
Détails de conception
- Objectif principal: Science basique
- Modèle interventionnel: Affectation parallèle
- Masquage: Aucun (étiquette ouverte)
Armes et Interventions
Groupe de participants / Bras |
Intervention / Traitement |
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Comparateur actif: 1
Conventional allergen challenge: increasing allergen doses given by nebulisation through the mouth and stopped when a 20% fall in forced expiratory volume in one second is obtained. Low dose allergen challenge: very low allergen doses given by nebulisation through the mouth. No more than a 5% fall in forced expiratory volume in one second. Nasal allergen challenge: One drop of increasing allergen doses on nasal mucosa. |
Conventional allergen challenge: increasing allergen doses given by nebulisation through the mouth and stopped when a 20% fall in forced expiratory volume in one second is obtained. Low dose allergen challenge: very low allergen doses given by nebulisation through the mouth. No more than a 5% fall in forced expiratory volume in one second. Nasal allergen challenge: One drop of increasing allergen doses on nasal mucosa. Low dose allergen challenge: very low allergen doses given by nebulisation through the mouth. No more than a 5% fall in forced expiratory volume in one second. Nasal allergen challenge: One drop of increasing allergen doses on nasal mucosa. |
Comparateur actif: 2
Low dose allergen challenge: very low allergen doses given by nebulisation through the mouth. No more than a 5% fall in forced expiratory volume in one second. Nasal allergen challenge: One drop of increasing allergen doses on nasal mucosa. |
Conventional allergen challenge: increasing allergen doses given by nebulisation through the mouth and stopped when a 20% fall in forced expiratory volume in one second is obtained. Low dose allergen challenge: very low allergen doses given by nebulisation through the mouth. No more than a 5% fall in forced expiratory volume in one second. Nasal allergen challenge: One drop of increasing allergen doses on nasal mucosa. Low dose allergen challenge: very low allergen doses given by nebulisation through the mouth. No more than a 5% fall in forced expiratory volume in one second. Nasal allergen challenge: One drop of increasing allergen doses on nasal mucosa. |
Que mesure l'étude ?
Principaux critères de jugement
Mesure des résultats |
Délai |
---|---|
Change in CysLT1-r following allergen challenge
Délai: At 7h and 24h following conventional challenge
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At 7h and 24h following conventional challenge
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Mesures de résultats secondaires
Mesure des résultats |
Délai |
---|---|
Change in CysLT1-r following low dose allergen challenge
Délai: At 2 and 4 days of challenge
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At 2 and 4 days of challenge
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Difference in CysLT1-r expression in asthma and allergic rhinitis
Délai: At baseline
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At baseline
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Collaborateurs et enquêteurs
Parrainer
Dates d'enregistrement des études
Dates principales de l'étude
Début de l'étude
Achèvement primaire (Anticipé)
Achèvement de l'étude (Anticipé)
Dates d'inscription aux études
Première soumission
Première soumission répondant aux critères de contrôle qualité
Première publication (Estimation)
Mises à jour des dossiers d'étude
Dernière mise à jour publiée (Estimation)
Dernière mise à jour soumise répondant aux critères de contrôle qualité
Dernière vérification
Plus d'information
Termes liés à cette étude
Termes MeSH pertinents supplémentaires
- Infections
- Infections des voies respiratoires
- Maladies des voies respiratoires
- Maladies du système immunitaire
- Maladies pulmonaires
- Hypersensibilité immédiate
- Maladies bronchiques
- Maladies oto-rhino-laryngologiques
- Maladies pulmonaires obstructives
- Hypersensibilité respiratoire
- Hypersensibilité
- Maladies du nez
- Asthme
- Rhinite
- Rhinite allergique
Autres numéros d'identification d'étude
- P1179
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