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New origin found for a critical immune response
Date:3/1/2009

e scientist who knew about these findings told Gunn the Duke group would "never figure this out" because their findings were so unconventional.

To solve the mystery, the Duke team studied several different types of mice, which were missing other chemokines or chemokine receptors. They found that mice without the Ccr2 chemokine receptor that controls the migration of inflammatory monocytes had much lower accumulation of monocyte-derived dendritic cells and TH1 responses.

The scientists concluded that there is a blood-derived lymph node dendritic cell type that has a key role in developing acute T-cell responses. "For so long, dendritic cells from tissues were the obvious answer," Gunn said. "We found out that that's not always the case."

The team now plans to look at the blood-derived dendritic cells under different conditions to see if they may have other activities. "We observed the activity of these cells after TH1-inducing stimuli, like influenza," Gunn said. "Next we'd like to study other types of immune stimuli to see how the cells respond."

Understanding how dendritic cells stimulate different types of immune response would open the door to enhancing or inhibiting these responses, a major goal of immunologists trying to prevent infections or control autoimmune disease, Gunn said.


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Contact: Mary Jane Gore
mary.gore@duke.edu
919-660-1309
Duke University Medical Center
Source:Eurekalert

Page: 1 2

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