Differential Effects of Tacrolimus versus Sirolimus on the Proliferation, Activation and Differentiation of Human B Cells

PloS One
Opas TraitanonLorenzo Gallon

Abstract

The direct effect of immunosuppressive drugs calcineurin inhibitor (Tacrolimus, TAC) and mTOR inhibitor (Sirolimus, SRL) on B cell activation, differentiation and proliferation is not well documented. Purified human B cells from healthy volunteers were stimulated through the B Cell Receptor with Anti-IgM + anti-CD40 + IL21 in the absence / presence of TAC or SRL. A variety of parameters of B cell activity including activation, differentiation, cytokine productions and proliferation were monitored by flow cytometry. SRL at clinically relevant concentrations (6 ng/ml) profoundly inhibited CD19(+ )B cell proliferation compared to controls whereas TAC at similar concentrations had a minimal effect. CD27(+) memory B cells were affected more by SRL than naïve CD27- B cells. SRL effectively blocked B cell differentiation into plasma cells (CD19(+)CD138(+) and Blimp1(+)/Pax5(low) cells) even at low dose (2 ng/ml), and totally eliminated them at 6 ng/ml. SRL decreased absolute B cell counts, but the residual responding cells acquired an activated phenotype (CD25(+)/CD69(+)) and increased the expression of HLA-DR. SRL-treated stimulated B cells on a per cell basis were able to enhance the proliferation of allogeneic CD4(+)CD25(-) T cells...Continue Reading

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Citations

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Aug 28, 2021·Journal of Clinical Medicine·Danae OlasoJean Kwun

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Methods Mentioned

BETA
density gradient centrifugation
flow cytometry
PMA

Software Mentioned

FlowJo
CXP
SAS

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