alexa Impact of myelin-specific antigen presenting B cells on T cell activation in multiple sclerosis.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Harp CT, LovettRacke AE, Racke MK, Frohman EM, Monson NL

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Abstract The role of B cells in the pathogenesis of Multiple Sclerosis (MS) is incompletely understood. Here we define a possible role for B cells as myelin-specific antigen presenting cells (B-APCs) in MS. Peripheral blood B cells (PBBC) isolated from both MS patients and healthy controls (HC) were activated in vitro with either CD40L/IL-4 or a Class B CpG oligodeoxynucleotide (CpG ODN)/IL-2. Both activation techniques induced PBBCs to upregulate CD80 and HLA-DR, rendering them more efficient APCs than resting B cells. Although the CD40L/IL-4 B-APCs were highly effective in eliciting CNS-antigen specific proliferation by autologous T cells, CpG ODN/IL-2 stimulated B cells were not. Furthermore, CD40L/IL-4 B-APC induced responses by autologous CD4(+) T cells were susceptible to blocking with anti-HLA-DR antibody, suggesting that T cell responses were specific for antigen presentation by B-APC. CNS-antigen specific CD8(+) T cell proliferation was also blocked by HLA-DR, suggesting that CD8(+) proliferation is in part dependent on CD4(+) help. This article was published in Clin Immunol and referenced in Journal of Clinical & Cellular Immunology

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