Role of Mitochondria in Non Severe Asthma (MITASTHME)

University Hospital of Bordeaux

Status

Completed

Conditions

Asthma

Treatments

Procedure: fiberoptic fibroscopy

Study type

Interventional

Funder types

Other

Identifiers

NCT00808730

CHUBX 2008/29

Details and patient eligibility

About

Asthma is a frequent disease characterized by bronchial hyperresponsiveness, inflammation and remodelling. Bronchial remodelling is an abnormal repair process that contributes to the development of poorly reversible airway narrowing. It can appear very early in the evolution of the disease and involves an increased mass of bronchial smooth muscle (BSM). The mechanism of such an increase has been related with an increase in smooth muscle cell proliferation. Recently, we have demonstrated that, BSM increased proliferation is induced by an enhanced mitochondrial biogenesis in severe asthma (T. Trian et al. J Exp Med 2007). The objective of this study is to investigate the role of smooth muscle cell mitochondria in non severe asthma

Full description

Bronchial remodelling mainly involves an increased mass of bronchial smooth muscle (BSM), which is related with an increase proliferation of BSM cells. Recently, using BSM cells obtained from severe asthmatics, we have demonstrated that such an increase proliferation was induced by an activation cascade involving an abnormal calcium entry, and the subsequent activation of Calmodulin-kinase IV, PGC-1alpha, NRF-1 and mt-TFA leading to an increase mitochondrial biogenesis (T. Trian et al, J Exp Med 2007). The objective of this study is to investigate the role of BSM cell mitochondria in non severe asthma.

For this purpose, 30 non severe asthmatic adult patients (>18 yr) will be prospectively recruited from the "CHU de Bordeaux" according to the Global Initiative for Asthma (GINA) guidelines. Inclusion visit will include written informed consent, asthma control questionnaire, clinical examination, lung function testing (i.e. arterial gas, exhaled NO, plethysmography), prick tests, chest X Ray and blood sample for total IgE levels. Bronchial specimens will be obtained from all subjects by fiberoptic bronchoscopy. BSM remodelling will be evaluated by morphological analysis. Patients will be divided into 2 groups according to the presence or the absence of BSM remodelling. Using BSM cell culture, the role of mitochondria will be analyzed by electronic microscopy, confocal microscopy, immunoblotting, RT-PCR and oxygraphy.

Enrollment

32 patients

Sex

All

Ages

18+ years old

Volunteers

No Healthy Volunteers

Inclusion criteria

Male or female aged more than 18 years
Diagnosis of intermittent asthma, mild persistent asthma or moderate persistent according to ATS criteria
Forced expiratory volume in one second > 60% predicted
Written informed consent

Exclusion criteria

Smoker or former smoker (tobacco or cannabis)
Adults protected by law
Subjects not affiliated with social security
Subjects during exclusion relative to another protocol or for which the annual maximum allowance of 3800 euros has been reached
Subject with any co-morbidity (except chronic rhinitis, chronic sinusitis nasal polyps or gastro-oesophageal reflux)
Asthma exacerbation within 6 weeks before enrolment
Infections of the upper airway within 3 months before enrolment
Chronic viral infections (hepatitis, HIV)
Pregnancy or breastfeeding
Contraindications to bronchoscopy