Total IgE (Immunoglobulin E) and Der p 1 (d1) Specific IgE in Induced Sputum in Patients With Allergic and Non-allergic Asthma

Fundació Institut de Recerca de l'Hospital de la Santa Creu i Sant Pau

Status: Completed

Conditions: Asthma

Treatments: Behavioral: Induced Sputum

Study type: Observational

Funder types: Other

Identifiers

NCT03640936

IIBSP-ASM-2014-66

Details and patient eligibility

About

Asthma is a heterogeneous disease, and specifically the phenotype of non-allergic asthma is not yet well defined. Several studies describe this group of patients as having severe asthma, persistent eosinophilia and poor therapeutic response. Among the theories being considered is the role of local IgE. Objectives: 1) To perform a pilot test to validate the measurement technique and standardize the levels of total IgE and IgE specific to Dermatophagoides pteronyssinus (d1) in the induced sputum of asthmatic patients and healthy volunteers. 2) Correlate local total IgE and specific IgE levels to d1 (sputum and peripheral blood) in patients with allergic and non-allergic asthma. 3) Describe the clinical and inflammatory characteristics of patients with allergic and non-allergic asthma.

Full description

Comparative cross-sectional study. It will include 32 allergic and non-allergic asthma patients and 10 healthy volunteers. All patients will have an induced sputum, pulmonary function studies, FENO (exhaled fraction of nitric oxide), total and specific IgE measurement at d1 (the most common perennial pneumoallergen) in blood and induced sputum, as well as a prick skin test with standardized allergen extracts. Measurement of total IgE and IgE for d1 in induced sputum will be performed in the supernatant and by the ImmunoCAP (Phadia ThermoFisher Scientific) immunofluoroassay technique.

Enrollment: 32 patients

Sex: All

Ages: 18 to 70 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Age 18-70
• Asthma according to GEMA (spanish asthma guideline)

Exclusion criteria

• Pregnancy
• Active smoking
• Moderate alcohol consumption
• Atopic dermatitis
• Other respiratory disease different than asthma (COPD, bronchiectasis, cystic fibrosis, pleural disease, interstitial disease)
• Treatment with steroids or inmunodepressants
• Active malignancy.

Trial design

32 participants in 3 patient groups

Healthy

Description:

Healthy controls, without asthma or allergy (negative prick test)

Treatment:

Behavioral: Induced Sputum

Allergic asthma

Description:

Patients with allergic asthma sensitized to Dermatophagoides pteronyssinus, tested by prick test or specific IgE

Treatment:

Behavioral: Induced Sputum

Non-allergic asthma

Description:

Patients with asthma not sensitized to Dermatophagoides pteronyssinus, with negative prick test or specific IgE

Treatment:

Behavioral: Induced Sputum