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The cellular receptor for Epstein-Barr virus (EBV) is the type 2 complement receptor, CD21. At initial infection, EBV virion glycoproteins gp350 and gp220 bind to CD21. We report here that the cross-linking of CD21 by gp350/220 results in increased amounts of interleukin 6 (IL-6) RNA and IL-6 protein. This effect could be blocked with anti-gp350/220 and anti-CD21 monoclonal antibodies. Induction of IL-6 in B cells by EBV could be mimicked by treatment with the protein kinase C (PKC) activator phorbol 12,13-dibutyrate but not with the calcium ionophore ionomycin. IL-6 induction by EBV was inhibited with the PKC-specific inhibitor bisindolylmaleimide or the protein tyrosine kinase inhibitors methyl 2,5-dihydroxycinnamate and herbimycin A, indicating that the induction of IL-6 following CD21 cross-linking is mediated through PKC- and protein tyrosine kinase-dependent pathways.

Induction of interleukin-6 after stimulation of human B-cell CD21 by Epstein-Barr virus glycoproteins gp350 and gp220