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Restoring appropriate movement to immune cells may save seriously burned patients
Date:6/19/2013

ed and direction of neutrophil movement after burn injury and to investigate whether recently identified molecules called resolvins, which normally act to terminate the inflammatory process after an infection has cleared, could also restore normal neutrophil motion after burns.

Using a microfluidic device that measures neutrophil movement developed at the MGH BioMEMS Resource Center, the investigators first confirmed that the ability of neutrophils from burn-injured rats to move towards a chemical signal of injury progressively deteriorates in both speed and accuracy as time passes. While cells from uninjured animals moved quickly and directly through a series of microchannels towards the injury signal, cells from blood samples taken 9 days after the injury became trapped in the device or reversed direction. The researchers then showed that application of resolvin D2 significantly improved the in vitro migratory ability of neutrophils from burned animals.

Experiments in living rats revealed that treatment with resolvin D2 restored appropriate neutrophil motion, an effect that lasted at least two days after treatment ended. In addition, when burn-injured animals were subjected to a second sepsis-inducing injury, treatment with resolvin D2 significantly increased survival. For example, in a group of rats injected with a bacterial toxin nine days after a burn injury, all of those pre-treated with resolvin survived, while all untreated animals died.

"Our ability to measure neutrophil movement in great detail gave us the information we needed to develop the optimal dosage and duration of resolvin treatment for the burned rats. Our results also indicate that neutrophil motility could be a useful biomarker for the actual risk of septic complications in patients," says Irimia, an assistant professor of Surgery at Harvard Medical School who is also affiliated with Shriner's Hospital for Children. "Our experiments in the animal model sugge
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Contact: Sue McGreevey
smcgreevey@partners.org
617-724-2764
Massachusetts General Hospital
Source:Eurekalert

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