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Macrophages in Smokers' Lung

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00298402
Recruitment Status : Withdrawn
First Posted : March 2, 2006
Last Update Posted : May 28, 2015
Royal Brompton & Harefield NHS Foundation Trust
Information provided by:
Imperial College London

Brief Summary:
Cigarette smoking causes an increase in inflammation in the lungs. In about 20% of smokers this inflammation leads to damage in lungs including making holes in the lung tissue. This damage can not be repaired and these people find it very difficult to breathe. One of the problems with this disease called chronic obstructive pulmonary disease, or COPD for short, is that by the time patients visit their doctor with symptoms, the damage has already been done. At the moment, there is no way to predict which smokers will go on to develop COPD. The aim of this research is to look at smokers who breathe normally and use an imaging technique called a CT scan, to look at their lungs in more detail. Some of these people will have spots on their scan which may be caused by inflammation. We want to look at the cells at these spots to see if they make more proteins and enzymes that cause lung damage when compared to people that do not have these spots. We would then be able to predict which smokers are likely to develop COPD and treat them early before they have damaged their lungs.

Condition or disease
Chronic Obstructive Pulmonary Disease Emphysema Chronic Bronchitis

Detailed Description:
Chronic obstructive pulmonary disease, or COPD for short, will be 3rd biggest killer in the world by 2020. The major cause of this disease is cigarette smoking, but only about 15-20% of smokers will develop COPD. In this disease, the lung becomes damaged and patients can not breathe properly. This damage can not be repaired therefore at the moment there are no good treatements for COPD. By the time a patient visits their doctor with symptoms the damage is already done. Therefore in this study we want to look at the lungs of smokers that feel well and can breathe normally. We believe that much of the damage to the lung in COPD is caused by inflammation. In particular, there are more inflammatory cells called macrophages in the lungs of these patients. These macrophages normally protect the lung when we inhale particles like dust and are also inportant to fight infections. In COPD, these macrophages are out of control and produce huge amounts of enzymes that break down lung tissue and more proteins that cause inflammation. We want to see if we can find these macrophages in the lungs of smokers before they get COPD. Recently, a 5 and a half year study showed that some smokers that can breathe normally have increased inflammation in their lungs. This can be seen using a scan called a CT scan. On the CT scan, these areas look like spots. When these smokers had another scan 5 and half years later, in some cases these spots had become holes in their lung. This is called emphysema and is one of the characteristics of COPD. We want to know whether the macrophages in these smokers cause this damage. If this is the case, we have two separate findings from this study. Firstly, we could look at macrophages and predict which smokers will develop COPD and secondly, try and develop new treatments to stop the macrophages from producing all proteins that cause inflammation.

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Study Type : Observational
Actual Enrollment : 0 participants
Observational Model: Case Control
Time Perspective: Prospective
Official Title: The Role of Macrophages in the Pathophysiology of Smokers' Lung
Study Start Date : October 2005
Study Completion Date : October 2007

Information from the National Library of Medicine

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Ages Eligible for Study:   21 Years to 70 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

All healthy smoking volunteers in trials will meet the following criteria:

Age 21-70 years. Smoking history of at least 10 pack years. (1 pack year = 20 cigarettes per day for 1 year).

No history of respiratory or allergic disease. Normal baseline spirometry as predicted for age, sex and height. No history of upper respiratory tract infection in the preceding six weeks. Not taking regular medication -

Exclusion Criteria:

Subjects will not included in this study if they meet any of the following exclusion criteria:

Clinically significant findings in the medical history or on physical examination.

Pregnant women or mothers who are breastfeeding. Subjects who are unable to give informed consent -

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00298402

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United Kingdom
Imperial College London
London, United Kingdom, SW3 6LY
Sponsors and Collaborators
Imperial College London
Royal Brompton & Harefield NHS Foundation Trust
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Principal Investigator: Athol Wells, MD Royal Brompton & Harefield NHS Foundation Trust

Layout table for additonal information Identifier: NCT00298402    
Other Study ID Numbers: 05/Q0404/87
First Posted: March 2, 2006    Key Record Dates
Last Update Posted: May 28, 2015
Last Verified: March 2006
Keywords provided by Imperial College London:
CT scan
Additional relevant MeSH terms:
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Lung Diseases, Obstructive
Pulmonary Disease, Chronic Obstructive
Bronchitis, Chronic
Lung Diseases
Respiratory Tract Diseases
Pathologic Processes
Bronchial Diseases
Respiratory Tract Infections