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Selectins have been shown to be crucial in the rolling process of leukocytes during lymphocyte homing and in the early phase of inflammatory processes. Recently, we and others have shown that binding of L-selectin to its ligands correlates with a rapid induction of several intracellular signaling molecules, in particular, Src-like tyrosine kinases, MAP-kinases, Jun NH 2 -terminal kinase, the...
Recent results suggest an activation of T-lymphocytes via the CD40L implying a dual function of this ligand involved in the activation of both B- and T-lymphocytes [1–4]. Here, we provide evidence that activation of T-lymphocytes via CD40L results in activation of a neutral but not an acidic sphingomyelinase correlating with a consumption of sphingomyelin and a release of ceramide. Activation of the...
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