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Correspondence to: Peter Lane, Medical Research Council Centre for Immune Regulation, Birmingham Medical School, Vincent Dr., Birmingham B15 2TT, UK. Tel:44-121-414-4078 Fax:44-121-414-3599 E-mail:p.j.l.lane{at}bham.ac.uk.
Mice rendered deficient in CD28 signaling by the soluble competitor, cytotoxic T lymphocyteassociated molecule 4immunoglobulin G1 fusion protein (CTLA4-Ig), fail to upregulate OX40 expression in vivo or form germinal centers after immunization. This is associated with impaired interleukin 4 production and a lack of CXC chemokine receptor (CXCR)5 on CD4 T cells, a chemokine receptor linked with migration into B follicles. Germinal center formation is restored in CTLA4-Ig transgenic mice by coinjection of an agonistic monoclonal antibody to CD28, but this is substantially inhibited if OX40 interactions are interrupted by simultaneous injection of an OX40-Ig fusion protein. These data suggest that CD28-dependent OX40 ligation of CD4 T cells at the time of priming is linked with upregulation of CXCR5 expression, and migration of T cells into B cell areas to support germinal center formation.
Key Words: CD28, OX40/OX40 ligand, germinal center, chemokine, T cell migration
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