|Detection of BAFF R/TNFRSF13C in PBMCs by Flow Cytometry. Peripheral blood mononuclear cells (PBMCs) were stained with Mouse Anti-Human CD19 Fluorescein‑conjugated Monoclonal Antibody (Catalog # FAB4867F) and either (A) Goat Anti-Human BAFF R/TNFRSF13C Antigen Affinity-purified Polyclonal Antibody (Catalog # AF1162) or (B) Normal Goat IgG Control (Catalog # AB-108-C) followed by APC-conjugated anti-goat secondary antibody (Catalog # F0108). View our protocol for Staining Membrane-associated Proteins.|
BAFF R/TNFRSF13C Inhibition of BAFF/BLys/|
TNFSF13B-dependent Cell Proliferation and Neutralization by Human BAFF R/TNFRSF13C Antibody. Recombinant Human BAFF R/TNFRSF13C Fc Chimera (Catalog #
1162‑BR) inhibits Recombinant Human BAFF/BLyS/TNFSF13B (Catalog # 2149‑BF) induced proliferation in mouse B cells in a dose-dependent manner (orange line). Inhibition of Recombinant Human BAFF/BLyS/TNFSF13B (5 ng/mL) activity elicited by Recombinant Human BAFF R/TNFRSF13C Fc Chimera (0.3 µg/mL) is neutralized (green line) by increasing concentrations of Goat Anti‑Human BAFF R/TNFRSF13C Antigen Affinity-purified Polyclonal Antibody (Catalog # AF1162). The ND50 is typically
B cell activating factor (BAFF), also known as BlyS, TALL-1, TNAK, and zTNF4, is a TNF ligand superfamily member and has been designated TNFSF13B. Produced by macrophages, dendritic cells, and T lymphocytes, BAFF promotes the survival of B cells and is essential for B cell maturation (1-4). BAFF binds to three TNF receptor superfamily members: B cell maturation antigen (BCMA/TNFRSF17), transmembrane activator and calcium-modulator and cyclophilin ligand interactor (TACI/TNFRSF13B) and BAFF receptor (BAFF R/BR3/TNFRSF13C). These receptors are type III transmembrane proteins that lack a signal peptide. Whereas TACI and BCMA bind BAFF and another TNF superfamily ligand, APRIL (a proliferation-inducing ligand), BAFF R selectively binds BAFF. The BAFF R extracellular domain lacks the TNF receptor canonical cysteine-rich domain (CRD) and contains only a partial CRD with four cysteine residues. Human and mouse BAFF R share 56% aa sequence identity. BAFF R is highly expressed in spleen, lymph node and resting B cells. It is also expressed at lower levels in activated B cell, in resting CD4+ T cells, in thymus and peripheral blood leukocytes. BAFF knockout mice lack mature B cells. Similarly, A/WySnJ mice that are defective in BAFF-R intracellular signaling also lack mature B cells, suggesting that BAFF R is the critical receptor for BAFF during B lymphopoiesis. In contrast, BCMA- or TACI-deficient mice have no major defect in B cell development. While the function of BCMA is not defined, TACI has been shown to control B cell homeostasis and T cell-independent immune responses.
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