Abstract
The adherence and transmigration of T cells through microvascular endothelium is an essential step for recruitment into inflammatory lesions, although the factors that stimulate the directional migration of T cells have not been fully characterized. In the present study we investigated the capacity of chemokines to induce migration of T cells across dermal microvascular endothelial cell monolayer. The results showed that recombinant MCP-1 significantly induced transendothelial migration of both resting and activated T cells. Maximal induction of migration was observed at a concentration of 10 ng/ml and a 3- to 4-hr incubation period. In contrast, the chemokines IL-8, RANTES, and MIP-1 alpha failed to stimulate T cell migration at doses as high as 100 ng/ml. In studies designed to investigate the intracellular signaling pathways mediating the MCP-1 effect, the results showed that MCP-1 at doses ranging from 10 to 100 ng/ml did not cause an increase in intracellular calcium ions in T cells, even though this chemokine induced rapid calcium mobilization in monocytes. Furthermore, pretreatment of T cells with either bisindolymaleimide HCl, a specific inhibitor of protein kinase C, or genistein, a protein tyrosine kinase inhibitor, s...Continue Reading
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