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- W2094397320 abstract "Syndecan-4 participates in focal adhesion by non-G protein-dependent activation of protein kinase C. Ligation of syndecan-4 with antithrombin elicits pertussis toxin-sensitive chemotaxis of leukocytes. As activation of protein kinase C stimulates release of sphingosine-1-phosphate, a chemoattracting G protein-coupled receptor agonist, we studied directional migration of leukocytes in response to phorbol myristate acetate (PMA), a direct activator of protein kinase C. Human peripheral blood neutrophils, monocytes, and lymphocytes were purified and tested for chemotactic migration in micropore filter assays in response to PMA. Dose-dependent stimulation of migration was seen only when leukocytes were exposed to concentration gradients of PMA; in the absence of such a gradient, inhibition of random migration was induced. Dimethylsphingosine inhibited PMA-induced leukocyte chemotaxis, indicating that activation of sphingosine kinase for enhanced production of sphingosine-1-phosphate mediates the chemotactic response to PMA. Pertussis toxin abrogated the chemotactic response to PMA, suggesting involvement of G protein-coupled sphingosine-1-phosphate receptor. Dimethylsphingosine also inhibited leukocyte chemotaxis toward antithrombin, indicating that similar mechanisms may be involved upon syndecan-4 ligation. Data show that protein kinase C-dependent activation of sphingosine kinase may play a central role in leukocyte chemotaxis toward non-G protein-coupled receptor agonists." @default.
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- W2094397320 date "2002-10-01" @default.
- W2094397320 modified "2023-09-27" @default.
- W2094397320 title "Sphingosine kinase-dependent directional migration of leukocytes in response to phorbol ester" @default.
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- W2094397320 doi "https://doi.org/10.1016/s0006-291x(02)02304-5" @default.
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