The induction of antibody production by IL-6 is indirectly mediated by IL-21 produced by CD4+ T cells.

The Journal of Experimental Medicine
Oliver DienzMercedes Rincon

Abstract

Interleukin (IL) 6 is a proinflammtory cytokine produced by antigen-presenting cells and nonhematopoietic cells in response to external stimuli. It was initially identified as a B cell growth factor and inducer of plasma cell differentiation in vitro and plays an important role in antibody production and class switching in vivo. However, it is not clear whether IL-6 directly affects B cells or acts through other mechanisms. We show that IL-6 is sufficient and necessary to induce IL-21 production by naive and memory CD4(+) T cells upon T cell receptor stimulation. IL-21 production by CD4(+) T cells is required for IL-6 to promote B cell antibody production in vitro. Moreover, administration of IL-6 with inactive influenza virus enhances virus-specific antibody production, and importantly, this effect is dependent on IL-21. Thus, IL-6 promotes antibody production by promoting the B cell helper capabilities of CD4(+) T cells through increased IL-21 production. IL-6 could therefore be a potential coadjuvant to enhance humoral immunity.

Associated Clinical Trials

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Methods Mentioned

BETA
transgenic
ELISA
flow cytometry
FACS
PMA
chip

Software Mentioned

GeneChip Operating Software
R
BioConductor
Prism
GraphPad
Heatplus

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