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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Stimulation of lymphocyte migration by endotoxin, tumor necrosis factor, and interferon.

Since several studies have demonstrated that lipopolysaccharide (LPS), tumor necrosis factor (TNF), and interleukin-1 (IL-1) enhanced lymphocyte binding to endothelial cells in vitro, we examined the effects of these agents on lymphocyte migration in vivo. Small peritoneal exudate lymphocytes (sPEL), which perferentially migrate into inflammatory sites, were radiolabeled with 111In and injected iv into rats. The id injection of LPS was a strong stimulus for the migration of these cells into the skin. TNF alpha was also a good stimulator of lymphocyte migration, while TNF beta and IL-1 alpha were weak or nearly inactive. Kinetic analysis demonstrated that migration to TNF was rapid, with a peak at 6 hr, followed by a steady decline, while migration to LPS was sustained for 24 hr. TNF alpha, TNF beta, and IL-1 alpha, when combined with interferon-gamma (IFN-gamma) or IFN-alpha/beta produced striking synergistic increases in lymphocyte migration. Combinations of the TNFs and IL-1 had less than additive effects, as did combinations of the IFNs. Qualitatively similar migration responses were found when spleen T cells instead of sPEL were studied.[1]

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