Role of Mitochondria in Non Severe Asthma
Raktažodžiai
Santrauka
apibūdinimas
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.
Datos
| Paskutinį kartą patikrinta: | 01/31/2010 |
| Pirmasis pateikimas: | 12/14/2008 |
| Numatytas registravimas pateiktas: | 12/14/2008 |
| Pirmas paskelbtas: | 12/15/2008 |
| Paskutinis atnaujinimas pateiktas: | 02/14/2010 |
| Paskutinis atnaujinimas paskelbtas: | 02/16/2010 |
| Faktinė studijų pradžios data: | 01/31/2009 |
| Numatoma pirminio užbaigimo data: | 10/31/2009 |
| Numatoma studijų užbaigimo data: | 10/31/2009 |
Būklė ar liga
Intervencija / gydymas
Procedure: 1
Fazė
Rankų grupės
| Ranka | Intervencija / gydymas |
|---|---|
| Experimental: 1 fiberoptic fibroscopy | Procedure: 1 Bronchial specimens will be obtained by fiberoptic bronchoscopy within 15 days after the enrolment |
Tinkamumo kriterijai
| Amžius, tinkami studijuoti | 18 Years Į 18 Years |
| Tinkamos studijoms lytys | All |
| Priima sveikus savanorius | Taip |
| Kriterijai | 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 |
Rezultatas
Pirminės rezultatų priemonės
1. BSM mitochondrial biogenesis assessed by the number of mitochondrial sections using electron microscopy, the porin content using western blot, and mitochondrial oxygen consumption evaluated by oxygraphy. [One bronchial fiberoptic fibroscopy within 15 days after the enrolment]
Antrinės rezultatų priemonės
1. BSM remodelling assessed by optic microscopy and immunohistochemistry (using anti-alpha smooth muscle actin antibody). [One bronchial fiberoptic fibroscopy within 15 days after the enrolment]
2. Transcription factors involved in mitochondrial biogenesis assessed by quantitative RT-PCR and western blot. [One bronchial fiberoptic fibroscopy within 15 days after the enrolment]
