P-glycoprotein functions as a differentiation switch in antigen presenting cell maturation

American Journal of Transplantation : Official Journal of the American Society of Transplantation and the American Society of Transplant Surgeons
Shona S PendseMarkus H Frank

Abstract

P-glycoprotein (P-gp) expressed on human antigen presenting cells (APC) regulates alloantigen-dependent T-cell activation, but the associated mechanisms are not well understood. Here we demonstrate that P-gp functions in IL-12-dependent monocyte differentiation into dendritic cell (DC) lineages during APC maturation, thereby regulating the capacity of myeloid-derived APCs to elicit alloimmune Th1 responses. Human CD14+ monocytes cultured in vitro in the presence of IL-4/GM-CSF differentiated into CD14(-) CD1A+ APCs of the immature DC phenotype. In contrast, P-gp blockade during differentiation inhibited CD1a induction, down-regulated CD80 expression, enhanced CD86 expression and induced CD68 expression. APCs differentiated in the presence of P-gp blockade stimulated alloimmune T-cell proliferation significantly less than controls and this effect was associated with 97% inhibition of Th1 IFN-gamma production, but preserved Th2 IL-5 secretion. MAb-mediated blockade of the P-gp transport substrate IL-12 in the course of APC differentiation also inhibited IFN-gamma production, while addition of rIL-12 to P-gp-blocked APC differentiation cultures significantly reversed this effect, demonstrating that P-gp functions in APC differenti...Continue Reading

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