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A century-old puzzle comes together: Scientists ID potential protein trigger in lung disease sarcoidosis
Date:5/3/2010

Lung researchers at Johns Hopkins have identified a possible protein trigger responsible for sarcoidosis, a potentially fatal inflammatory disease marked by tiny clumps of inflammatory cells that each year leave deep, grainy scars on the lungs, lymph nodes, skin and almost all major organs in hundreds of thousands of Americans.

The disorder, whose cause has been a persistent mystery for nearly a century, strikes mostly young adults and disproportionately affects African Americans.

The link between sarcoidosis and overproduction of the suspected protein trigger, called serum amyloid A, was revealed after a six-year investigation encompassing more than two dozen laboratory experiments, including some on diseased lung tissue samples from 86 patients in the Baltimore area.

"The increase in production of serum amyloid A explains for the first time how inflammation can persist in the lungs without being triggered by an active infection," says study senior investigator and pulmonologist David Moller, M.D., a professor at the Johns Hopkins University School of Medicine. Moller is also director of the sarcoidosis clinic at The Johns Hopkins Hospital.

Study lead investigator Edward Chen, M.D., says the new findings also clear the path for developing drug treatments or vaccines that can block serum amyloid A from binding to cell receptors and kicking off inflammation.

In the short term, however, Moller says his team has plans to use the study results to create diagnostic tests that could better predict which people with the disease are likely to heal on their own or are more likely to suffer persistent inflammation, which can lead to scarring, difficulty breathing, and heart failure that can only be fixed by lung transplantation.

In a report published in February in the American Journal of Respiratory and Critical Care Medicine, the Johns Hopkins scientists described their research on what was behind the mic
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Contact: David March
dmarch1@jhmi.edu
410-955-1534
Johns Hopkins Medical Institutions
Source:Eurekalert

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