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- W4313381284 abstract "Abstract We have recently identified that down-regulation of interleukin-4 receptor (IL-4R) is a novel hallmark of B-cell dysregulation in SLE patients. Single cell transcriptomics analysis revealed that elevation of IL4R in pre-switched B cells is the opposing signature of increased type I interferon stimulated genes (ISGs) and double negative B cells (TBX21, ITGAX, FCRL3, FCRL5, and ZEB2). Flow cytometry analysis further confirmed that down-regulation IL-4R and upregulation of intracellular IFN-β correlated with the loss of CD21+IgD+CD27− resting naïve (rNVA) B cells and accumulation of CD21−IgD+CD27− activated naïve (aNAV) and double negative CD21−IgD+CD27− B cells in SLE patients (n=47). Interestingly, exposure of SLE B cells to IL-4 prior to treatment with low-dose IL-2 (0.2 ng/mL) blocks the anti-Ig, IL-21, IFN-gamma, TLR7 and BAFF-stimulated development of T-bet+CD11c+IgD−CD27− DN2 B cells and CD27+CD38+ plasmablasts (PBs) and preserves B cells in the rNAV state. Such effect was diminished in the absence of IL-4 or when low-dose of IL-2 was substituted with high-dose of IL-2 (20 ng/mL). Stimulation of B cells with IL-4 promoted the induction of CD25 (IL-2RA) on B cells. Together, our results suggest a mechanism of action underlying the synergism between IL-4 and low-dose IL-2. Specifically, the IL-4R signaling pathways upregulate CD25 on B cells, thereby promoting formation of the high affinity IL-2R complexes required for low-dose IL-2 signaling that induces a regulatory signal that restores SLE B cells to the rNAV stage. Our results suggest that the process of development of autoreactive B cells in SLE can be directly measured in a clinical lab, and can be directly abrogated using cytokine therapy available for clinical use." @default.
- W4313381284 created "2023-01-06" @default.
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- W4313381284 date "2020-05-01" @default.
- W4313381284 modified "2023-10-16" @default.
- W4313381284 title "IL-4 synergizes with low-dose IL-2 to restore systemic lupus erythematosus B cells at the resting naive status" @default.
- W4313381284 doi "https://doi.org/10.4049/jimmunol.204.supp.218.8" @default.
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