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Bioengineered protein shows preliminary promise as new therapy for hemophilia
Date:10/23/2011

es (aPCCs) to restore blood clotting capability. But these agents are costly (as much as $30,000 per treatment) and not always effective. Camire added that, in the current animal study, they were able to show the variant protein is more effective at a lower dose than FVIIa.

The range of options for hemophilia patients could improve if the study results in animals were to be duplicated in humans. "The variant we have developed puts FXa back on the table as a possible therapeutic agent," said Camire. Naturally occurring (wild-type) FXa, due to its particular shape, is not useful as a therapy because normal biological processes shut down its functioning very quickly.

By custom-designing a different shape for the FXa protein, Camire's study team gives it a longer period of activity, while limiting its ability to engage in unwanted biochemical reactions, such as triggering excessive clotting. "This potentially could lead to a new class of bypass therapy for hemophilia, but acting further downstream in the clot-forming pathway than existing treatments," said Camire, who has investigated the biochemistry of blood-clotting proteins for more than a decade.

When infused into mice with hemophilia, the FXa variant reduced blood loss after injury, as it safely restored blood clotting ability. Further studies are necessary in large animal models to determine whether this approach can become a clinical treatment for hemophilia patients who have developed inhibitors, or even more broadly as a drug for uncontrolled bleeding in other clinical situations.


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Contact: John Ascenzi
Ascenzi@email.chop.edu
267-426-6055
Children's Hospital of Philadelphia
Source:Eurekalert

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