Nuclear factor of the Immunoglobulin Kappa chain of B cells (NF-kappaB) activation is an early event during cytokine-mediated endothelial activation related to increased adhesion of leucocytes. We report that soluble products secreted by two human lymphomas activate NF-kappaB, and increase the ability of endothelial cells to adhere U937 cells in vitro. Analysis of the tumor-derived products revealed the absence of tumor necrosis factor-alpha and interleukin-1beta. Interference of NF-kappaB activation prevented the increase in U937 cell adhesion, suggesting a potential role for endothelial NF-kappaB activation in the establishment of physical interactions between the vascular endothelium and tumor cells.
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