[HTML][HTML] IL-6 Production by Dendritic Cells Is Dispensable for CD8+ Memory T-Cell Generation

JF Daudelin, M Mathieu, S Boulet… - BioMed Research …, 2013 - hindawi.com
JF Daudelin, M Mathieu, S Boulet, N Labrecque
BioMed Research International, 2013hindawi.com
Following activation, naïve CD8+ T cells will differentiate into effectors that differ in their
ability to survive: some will persist as memory cells while the majority will die by apoptosis.
Signals given by antigen-presenting cells (APCs) at the time of priming modulate this
differential outcome. We have recently shown that, in opposition to dendritic cell (DC), CD40-
activated B-(CD40-B) cell vaccination fails to efficiently produce CD8+ memory T cells.
Understanding why CD40-B-cell vaccination does not lead to the generation of functional …
Following activation, naïve CD8+ T cells will differentiate into effectors that differ in their ability to survive: some will persist as memory cells while the majority will die by apoptosis. Signals given by antigen-presenting cells (APCs) at the time of priming modulate this differential outcome. We have recently shown that, in opposition to dendritic cell (DC), CD40-activated B-(CD40-B) cell vaccination fails to efficiently produce CD8+ memory T cells. Understanding why CD40-B-cell vaccination does not lead to the generation of functional long-lived memory cells is essential to define the signals that should be provided to naïve T cells by APCs. Here we show that CD40-B cells produce very low amount of IL-6 when compared to DCs. However, supplementation with IL-6 during CD40-B-cell vaccination did not improve memory generation. Furthermore, IL-6-deficient DCs maintained the capacity to promote the formation of functional CD8+ effectors and memory cells. Our results suggest that in APC vaccination models, IL-6 provided by the APCs is dispensable for proper CD8+ T-cell memory generation.
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