Chronic Obstructive Pulmonary Disease Clinical Trial
Official title:
How Smoking Causes COPD: Examination of Immune System Changes
A breathing condition known as "chronic obstructive pulmonary disease" (COPD) caused by cigarette smoking is a major health problem. The way by which smoking leads to lung disease is uncertain. Recent research done in animals provides a description of specific changes (that is a reduction) in these immune cell types as a result of cigarette smoke exposure. The study you have been asked to participate in is a pilot study to see if similar changes occur in humans who smoke. The purpose of this study is to evaluate this new method of testing blood in 3 groups of 10 people: normal non-smoking subjects, subjects who smoke with no history of lung disease and subjects who smoke and have smoking related COPD.
The mechanism by which smoking leads to damage to lung tissue in susceptible hosts, is
uncertain. Recently there has been description of specific changes (that is reduction) in
the number and activity of certain key immune cell types - dendritic cells- as a result of
cigarette smoke exposure. This work was done in animal models and we would like to develop
methods that will allow us to examine if similar changes occur in humans who smoke. Reduced
number and activity of dendritic cells would be expected to lead to increased incidence of
infection - a common problem in patients with COPD.
Since dendritic cells come to the lung from the bloodstream, and one can detect them in the
circulation, we will look at the dendritic cells that are present in the peripheral blood.
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