Systemic inflammation and comorbidity in COPD: a result of 'overspill' of inflammatory mediators from the lungs? Review of the evidence

Thorax
Nicola J Sinden, Robert A Stockley

Abstract

Chronic obstructive pulmonary disease (COPD) is characterised by an inflammatory response by the lungs to inhaled substances such as cigarette smoking and air pollutants. In addition to the pulmonary features of COPD, several systemic effects have been recognised even after controlling for common aetiological factors such as smoking or steroid use. These include skeletal muscle dysfunction, cardiovascular disease, osteoporosis and diabetes. Individuals with COPD have significantly raised levels of several circulating inflammatory markers indicating the presence of systemic inflammation. This raises the issue of cause and effect. The role of tumour necrosis factor α in COPD is thought to be central to both lung and systemic inflammation and has been implicated in skeletal muscle dysfunction, osteoporosis and type 2 diabetes. It has been hypothesised that inflammation in the lung results in 'overspill' into the circulation causing systemic inflammation. There is supportive evidence that protein movement can occur from the lung surface to the systemic circulation. Evidence from inhaled substances such as air pollutants and cigarette smoke has demonstrated a temporal link between the inflammatory process in the lung and systemic in...Continue Reading

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