- ICH GCP
- Registro de ensayos clínicos de EE. UU.
- Ensayo clínico NCT00147069
Leukocyte Function in Asthma and COPD
Investigation Into Inflammatory Mechanisms in Airway Cells in Smokers and Non-smokers With Inflammatory Lung Disease.
The aim of this study is to examine the inflammatory mechanisms involved in the pathogenesis of inflammatory lung disease, in particular to compare the inflammatory profile seen in asthma and COPD. Evidence for inflammation in asthma and COPD is based on the finding of increased numbers of macrophages and neutrophils in the lungs and respiratory secretions of these patients. The inflammatory cells produce proteases, as well as, reactive oxidant species resulting in a protease/anti-protease imbalance which favours lung destruction. The aim is to examine the inflammatory mediators released by inflammatory cells (such as, macrophages and lymphocytes) in order to determine whether there are differences between non-smoking subjects, smoking subjects and patients with asthma or COPD. Monocytes are precursors of alveolar macrophages, and both monocytes and neutrophils are recruited to the lung from the blood via the action of specific chemoattractants. We have evidence that in inflammation there are higher levels of these chemoattractants. Therefore these cells might also demonstrate the same changes seen in alveolar macrophages from these patients.
We also aim to assess the role of the macrophage precursor (monocyte) and neutrophils in the blood. We will also assess lymphocyte/monocyte interaction. We will do this as the lymphocyte may be involved in the initial recruitment of inflammatory cells. We will also assess the role of cytokines involved with monocyte/macrophage/neutrophil migration in induced sputum as well as the role of induced sputum in the migration of monocytes and neutrophils into the lung. Our aim is to link the initial changes in blood to the changes causing disease in the lungs. We aim to examine cellular responses in four groups of subjects, namely (i) non-smoking controls, (ii) smokers without clinical evidence of COPD or asthma, (iii) smokers with COPD (iv) asthmatic patients.
Descripción general del estudio
Estado
Condiciones
Descripción detallada
Overall subjects will be characterised into one of four groups: normal non-smoking subjects, healthy smokers, patients with asthma and patients with COPD. Subjects will have had to fulfil inclusion and exclusion criteria, and give written consent.
Recruitment Methods. Volunteer subjects (healthy non-smokers and healthy smokers) will be recruited from within the National Heart and Lung Institute. Volunteers will be recruited via advertising using ethically approved advertisements. Asthmatic and COPD patients will be recruited from the outpatient clinic at The Royal Brompton Hospital. At the screening visit, the diagnosis of asthma or COPD will be confirmed from the clinical case notes. If the patient is a volunteer, they will undergo a full history and examination, spirometry. Each subject will attend on one study visit only. At the first visit a number of investigations will be undertaken including, spirometry with reversibility (400 microg ventolin via metered dose inhaler if initial spirometry shows an obstructive picture to exclude asthmatics), and sputum induction. In addition, 50ml of venous blood will be taken.
More specifically, the following interventions will be undertaken by each subject
- Medical History and Physical Examination A full medical history and physical examination (including height and weight) will be performed on the initial screening visit, in addition to that recorded in the clinical case notes.
- Respiratory Assessments Forced Expiratory Volume per second (FEVI) will be measured using a dry wedge spirometer (Vitalograph, Buckingham, UK) and expressed as a percent of predicted value. Subjects will be trained in the use of the apparatus before beginning the study. The baseline value at each visit will be measured after at least fifteen minutes of quiet rest, and will be taken as the highest of three readings made at one minute intervals. 400 microg ventolin administered via a metered dose inhaler will be given if initial spirometry shows an obstructive picture (FEV1 <80% predicted, FEV1 /FVC<70%) in order to distinguish between the presence of asthma or COPD.
Sputum Induction Sputum induction will be performed in the Asthma Laboratory. The subject will inhale 3.5% saline at room temperature, nebulised via a De Vilbiss 99 Ultrasonic nebuliser set, at maximum output using a mouthpiece. After five minutes the subject will rinse his/her mouth thoroughly with water, and will be asked to cough deeply and expectorate sputum into a pot. Samples from this first five minute collection are discarded. This procedure will continue for a further ten minutes, and the resulting sample will be collected in a polypropylene pot.
It is important to explain to the subject that the aim is to obtain sputum, and that saliva should be disposed of by spitting into a bowl which is later discarded.
In the case of any chest discomfort or shortness of breath, the procedure is stopped and spirometry is repeated. If the FEV1 has fallen by 10% of the predicted value, the subject can rest until the FEV1 has returned to the baseline value or the procedure can be terminated.
Sputum samples will be analysed for differential and absolute cell counts (eosinophils, neutrophils, macrophages, lymphocytes, and columnar epithelial cells). Sputum supernatants will be assayed for TNF-alpha, IL-8, interferon-gamma, and other cytokine levels.
Immunohistochemistry will be performed on the induced sputum samples to identify the cellular localisation of factors involved with leukocyte function.
Cytospin preparations will be made for differential cell counts and the soluble fraction will be used for cytokine assays.
- Venous Blood Sampling Fifty (50) millilitres of blood shall be venesected at the study visit. We will investigate factors involved in leukocyte function and chemotaxis. We will also assess cellular distributions of receptors thought to be important in regulation by using FACS analysis.
Tipo de estudio
Inscripción (Actual)
Contactos y Ubicaciones
Ubicaciones de estudio
-
-
-
London, Reino Unido, SW3 6LY
- Royal Brompton Hospital/NHLI Imperial College London
-
-
Criterios de participación
Criterio de elegibilidad
Edades elegibles para estudiar
Acepta Voluntarios Saludables
Géneros elegibles para el estudio
Método de muestreo
Población de estudio
Descripción
Inclusion Criteria:
Asthmatic patients:
- Age 21-79 years of both sexes (females will be taking adequate contraceptive measures).
- Increase in FEV1 >15% and >200ml following beta2 agonist inhalation, either at the time of study or previously documented
COPD patients:
- Stable patients with a post-salbutamol FEV1 30-70% predicted normal of >1L
- Increase in FEV1 < 15% and < 200 ml following beta2 agonist inhalation, either at the time of study or previously documented
- Age 21-79 years of both sexes (females will be taking adequate contraceptive measures )
- Smokers
- No history of allergic or respiratory disease.
Normal Volunteers
- Age 21-79 years of both sexes (females will be taking adequate contraceptive measures )
- Non-smokers
- Normal lung function
- No upper respiratory tract infection within the last 4 weeks
- No history of allergic or respiratory disease.
Healthy Smokers 1. Age 21-79 years of both sexes (females will be taking adequate contraceptive measures ) 2. Smokers 3. Normal lung function 4. No upper respiratory tract infection within the last 4 weeks
-
Exclusion Criteria:
- Asthmatic patients with FEV1 less than 40% predicted value
- Alcohol abuse
- Any history or evidence of hepatic, cardiovascular or renal disease
- Any history or evidence of neuropsychiatric disease
- Drug abuse or any other condition associated with poor compliance
- Pregnancy or breast feeding
- Patients are unable to provide written informed consent
COPD patients:
1. Any other active lung diseases 2. Upper respiratory infection within the last 4 weeks 3. Pregnancy or breast feeding 4. Any mental condition rendering the patient unable to understand the nature, scope and possible consequences of the study 5. Subjects unable to give informed consent
-
Plan de estudios
¿Cómo está diseñado el estudio?
Detalles de diseño
Cohortes e Intervenciones
Grupo / Cohorte |
---|
Controls
Non-smoking control subjects without lung disease
|
Asthmatics
Non-smokers patients with asthma
|
Non-COPD smokers
Current smokers without airways obstruction, FEV1 >80% predicted
|
COPD smokers
Patients with COPD and cigarette smokers
|
¿Qué mide el estudio?
Medidas de resultado primarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
---|---|---|
Total Number of Inflammatory Cells Recovered in Sputum
Periodo de tiempo: 1 year
|
Sputum was induced via inhalation of hypertonic saline as previously described, and was processed for differential counts of inflammatory cells.
|
1 year
|
Number of Matrix Metalloproteases (MMPs) MMP1
Periodo de tiempo: 1 year
|
MMPs determined using paired antibody quantitative ELISAs
|
1 year
|
Number of Matrix Metalloproteases (MMPs) MMP3
Periodo de tiempo: 1 year
|
MMPs determined using paired antibody quantitative ELISAs
|
1 year
|
Number of Matrix Metalloproteases (MMPs) MMP8
Periodo de tiempo: 1 year
|
MMPs determined using paired antibody quantitative ELISAs
|
1 year
|
Colaboradores e Investigadores
Patrocinador
Investigadores
- Investigador principal: Louise E Donnelly, PhD, Imperial College London
Publicaciones y enlaces útiles
Fechas de registro del estudio
Fechas importantes del estudio
Inicio del estudio (Actual)
Finalización primaria (Actual)
Finalización del estudio (Actual)
Fechas de registro del estudio
Enviado por primera vez
Primero enviado que cumplió con los criterios de control de calidad
Publicado por primera vez (Estimar)
Actualizaciones de registros de estudio
Última actualización publicada (Actual)
Última actualización enviada que cumplió con los criterios de control de calidad
Última verificación
Más información
Términos relacionados con este estudio
Palabras clave
Términos MeSH relevantes adicionales
- Procesos Patológicos
- Infecciones
- Infecciones del Tracto Respiratorio
- Enfermedades de las vías respiratorias
- Enfermedades del sistema inmunológico
- Enfermedades pulmonares
- Hipersensibilidad, Inmediata
- Enfermedades bronquiales
- Enfermedades Pulmonares Obstructivas
- Hipersensibilidad Respiratoria
- Hipersensibilidad
- Enfermedad Pulmonar Obstructiva Crónica
- Asma
- Enfisema
- Bronquitis
- Bronquitis Crónica
Otros números de identificación del estudio
- 04-059
Plan de datos de participantes individuales (IPD)
¿Planea compartir datos de participantes individuales (IPD)?
Información sobre medicamentos y dispositivos, documentos del estudio
Estudia un producto farmacéutico regulado por la FDA de EE. UU.
Estudia un producto de dispositivo regulado por la FDA de EE. UU.
Esta información se obtuvo directamente del sitio web clinicaltrials.gov sin cambios. Si tiene alguna solicitud para cambiar, eliminar o actualizar los detalles de su estudio, comuníquese con register@clinicaltrials.gov. Tan pronto como se implemente un cambio en clinicaltrials.gov, también se actualizará automáticamente en nuestro sitio web. .