ABSTRACT
Chronic obstructive pulmonary disease is characterized by an abnormal persistent inflammatory
response to noxious environmental stimuli, most commonly cigarette smoke. Although
cigarette smoking elicits airway inflammation in all of those who smoke, persistent
inflammation and clinically significant COPD occurs in only a minority of smokers.
The pathogenesis of COPD involves the recruitment and regulation of neutrophils, macrophages,
and lymphocytes to the lung, as well as the induction of oxidative stress, all of
which result in lung parenchymal destruction and airway remodeling. Recent research
has generated a greater understanding of the mechanisms responsible for COPD development,
including new concepts in T cell biology and the increasing recognition that the processes
governing lung cell apoptosis are upregulated. We are also starting to understand
the reasons for continued inflammation even after smoking cessation, which accelerates
the rate of lung function decline in COPD. Herein we review our current knowledge
of the inflammatory pathways involved in COPD pathogenesis, as well as newer concepts
that have begun to unfold in recent years.
KEYWORDS
Chronic obstructive pulmonary disease - oxidative stress - apoptosis - inflammatory
cells - cytokines
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