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Children's National Research Links Platelets to Sepsis-Related Organ Failure
Date:3/11/2009

ted States. More than 40 percent of sepsis cases are fatal, and in most, the resulting organ failure, not the underlying infection, is the primary cause of death. Through gene and protein analyses in both septic mice and humans, scientists found that cases of severe sepsis featured a unique attribute: the genes within platelets were triggered to produce a protein known as granzyme B, which has been shown in previous studies to contribute to cell death as part of the body's immune response to cancer and viruses. During sepsis, platelets collect within major organs including the spleen, an important infection-fighting organ. As they collect and come into contact with the organ's cells, the granzyme B, if present, will cause the organ's cells to die. Previous research has shown that that this factor may be a major contributor to organ failure. Granzyme B was only detected in humans and mice with the most severe sepsis.
   
"Detection of granzyme B in platelets could be a huge step forward in battling sepsis," said Dr. Freishtat. "First, as a prognostic indicator, the protein's presence could show more aggressive treatments are needed right off the bat. Eventually, perhaps this knowledge will help us find a way to prevent organ failure by targeting interventions directly at the platelets and granzyme B production."

The study was funded by the National Institutes of Health and Children's National Medical Center. The full manuscript, "Sepsis Alters the Megakaryocyte-Platelet Transcriptional Axis Resulting in Granzyme B-mediated Lymphotoxicity," is at: http://ajrccm.atsjournals.org/cgi/content/abstract/200807-1085OCv1.

Contact: Jennifer Leischer/Emily Dammeyer, 202-476-4500

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