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Lungs repair themselves

The lungs of patients suffering chronic obstructive pulmonary disease (COPD) attempt to repair damaged elastic fibers, reports a new finding//.

This finding is in contradiction with the conventional wisdom on the capabilities of the adult lung. The finding is important because it could pave the way to develop a drug to 'turn on' key genes to allow the lung to grow new alveoli.

The study "Evidence for attempted regional elastic fiber repair in severe emphysema," was done by Jason Woods, Kristin Castillo, Alexander Patterson and Richard Pierce of Washington University, St. Louis, Mo.; Joel Cooper of the University of Pennsylvania, Philadelphia; and James Hogg of St. Paul's Hospital, Vancouver, British Columbia. The authors presented their findings at The American Physiological Society conference "Physiological Genomics and Proteomics of Lung Disease."

The researchers found that synthesis of elastin, a gene linked to elastic fiber growth, is increased in the moderately diseased tissue of COPD patients. Elastic fibers allow the lung to expand and contract with breathing.

"We've found elastin synthesis to increase in the air sacs (alveoli) and airways of the lungs of patients suffering severe or end-stage COPD," Woods explained. "This shows that the lung may be attempting to repair itself."

The finding is important because it could pave the way to develop a drug to 'turn on' key genes to allow the lung to grow new alveoli, he said. Alveoli play a role in the exchange of oxygen and carbon dioxide between the lungs and the circulatory system.

A 2-year-old could do it.

Very young children who suffer lung injuries increase elastin expression and produce new elastic fibers inside the alveoli, Woods said. Adults do not have that ability and that has led physiologists to conclude that the elastin gene must shut off after we reach a certain age, ending elastin fiber production.

Physiologists want to
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