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Making treatment of rare blood disorder more affordable and effective
Date:2/27/2014

PHILADELPHIA A University of Pennsylvania research team has defined a possible new way to fight a disease that is currently treatable only with the most expensive drug available for sale in the United States. In a study published this month in Blood, the Penn team describes the strategy, based on the oldest part of the human immune system called "complement" -- that could turn out to be less costly and more effective for the majority of patients with a rare blood disorder.

Complement is a network of more than 50 proteins in the blood and on cell surfaces that quietly cruise the body, keeping a low profile until triggered into action. On the other hand, this system can turn, contributing to a broad spectrum of immune, inflammatory, and age-related diseases.

John Lambris, PhD, the Dr. Ralph and Sallie Weaver Professor of Research Medicine in the Department of Pathology and Laboratory Medicine in the Perelman School of Medicine, studies this early-warning system and how to correct it when its response goes overboard.

This is known to be the case with paroxysmal nocturnal hemoglobinuria (PNH), a rare but life-threatening hematological disorder, which is estimated to affect between 1 and 5 per million people. In PNH, defective expression of regulatory proteins on the surface of blood cells leaves them vulnerable to complement attack. This can lead to premature death of the red blood cells, a process called hemolysis, which clinically results in severe anemia and contributes to a high risk of clotting.

Lambris and Daniel Ricklin, PhD, research assistant professor of Pathology and Laboratory Medicine, are developing novel therapeutics to tame this inappropriate complement activation and protect cell surfaces from attack.

Eculizumab (Soliris, an Alexion Pharmaceuticals drug) -- to date the only approved therapeutic for PNH -- reduces hemolysis and gives relief from blood transfusions for most PNH patients. However,
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Contact: Karen Kreeger
karen.kreeger@uphs.upenn.edu
215-349-5658
University of Pennsylvania School of Medicine
Source:Eurekalert

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