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• W4247029786 abstract "The extravasation of leukocytes from the lumen of the vessel to a site of inflammation requires specific binding events. The interaction of leukocytes with endothelium, via specific receptors, may provide intracellular signals that activate extravasating cells. In the present study, we have investigated the production of chemokines, interleukin-8 (IL-8), and monocyte chemoattractant protein-1 (MCP-1) during monocyte: endothelial cell interactions. Both unstimulated and interferon-gamma (IFN-gamma)-prestimulated human umbilical vein endothelial cells (HUVEC) produced low constitutive levels of IL-8 and MCP-1. The addition of enriched monocytes with unstimulated HUVEC resulted in synergistic increases in production of both IL-8 and MCP-1. Monocytes cultured with IFN-gamma-preactivated HUVECs demonstrated little additional increase in IL-8 and MCP-1 production in coculture assays compared with unstimulated HUVEC. Northern blot analysis paralleled the protein data, demonstrating upregulated expression of IL-8 and MCP-1 mRNA in stimulated and unstimulated coculture assays. Culture of enriched monocytes and endothelial cells in transwells demonstrated no increases in IL-8 or MCP-1, indicating the necessity for cellular contact for chemokine production. In previous investigations, we have demonstrated that increased monocyte-derived MIP-1 alpha production was induced by intracellular adhesion molecule-1 (ICAM-1) interactions on activated HUVECs. In contrast, addition of anti-ICAM-1 monoclonal antibodies (MoAbs) did not diminish the production of IL-8 and MCP-1 in the present study. Furthermore, neither antibodies to IL-1 nor tumor necrosis factor (TNF) diminished the production of either IL-8 or MCP- 1. However, when soluble matrix proteins were added to the coculture to block cellular interactions, the chemokine protein and mRNA levels were significantly decreased. IL-8 production was decreased by both soluble collagen and fibronectin, whereas MCP-1 was decreased by only soluble collagen, suggesting differential activation pathways. These results indicate that IL-8 and MCP-1 production are increased during monocyte and endothelial cell interactions in part due to matrix protein binding mechanisms. This mechanism may serve a role in cell activation, production of chemokines, as well as extravasation and recruitment of additional leukocytes during inflammatory responses." @default.
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• W4247029786 date "1995-10-01" @default.
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• W4247029786 title "Production of chemokines, interleukin-8 and monocyte chemoattractant protein-1, during monocyte: endothelial cell interactions" @default.
• W4247029786 doi "https://doi.org/10.1182/blood.v86.7.2767.bloodjournal8672767" @default.
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