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The Journal of Immunology, Vol 156, Issue 4 1356-1361, Copyright © 1996 by American Association of Immunologists
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PM Dubois, D Palmer, ML Webb, JA Ledbetter and RA Shapiro
Bristol-Myers Squibb Pharmaceutical Research Institute, Seattle, WA 98121, USA.
Members of the C-C family of chemotactic cytokines promote chemotaxis and adhesion of leukocytes. In this study, we have identified a murine T cell hybrid that expresses receptors to the chemotactic cytokine monocyte chemotactic protein-1 (MCP-1). This cell line was used to examine MCP-1 receptor-mediated signal transduction events in a homologous system in the absence of interference with other receptors. Our results show that in the 3B4 M1.9 T cell hybrid, MCP-1 receptors mediate intracellular calcium mobilization and extracellular calcium import without detectable increases in total water-soluble inositol phosphates. In addition, MCP-1 regulates the tyrosine phosphorylation of specific substrates at 42 and 44 kDa and induces mobility shift of p42/44 mitogen-activated protein kinases. MCP-1-mediated calcium responses, tyrosine phosphorylation, and the electrophoretic mobility shift of p42/44 mitogen-activated protein kinases can be inhibited by pretreatment of cells with pertussis toxin, indicating a role for Gi- like G proteins in coupling the MCP-1R to signal transduction.
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