B cell maturation antigen, the receptor for a proliferation-inducing ligand and B cell-activating factor of the TNF family, induces antigen presentation in B cells.
B cell maturation Ag (BCMA), a member of the TNFR superfamily expressed on B cells, binds to a proliferation-inducing ligand (APRIL) and B cell-activating factor of the TNF family (BAFF) but the specific B cell responses regulated by BCMA remain unclear. This study demonstrates that ligation of A20 B cells transfected with BCMA induces the expression of CD40, CD80/B7-1, CD86/B7-2, MHC class II, and CD54/ICAM-1, which subsequently enhances the presentation of OVA peptide Ag to DO11.10 T cells. BCMA expression in murine splenic B cells can be induced with IL-4 and IL-6, allowing subsequent treatment with APRIL or agonist anti-BCMA to similarly induce Ag presentation. A comparative analysis of hybrid receptors of TNFR2 fused to the cytoplasmic domains of APRIL/BAFF receptors found that only BCMA, but not transmembrane activator and calcium-modulator and cyclophilin ligand interactor or BAFF-R, is capable of activating Ag presentation. Although all three receptors can trigger NF-kappaB signaling, only BCMA activates the JNK pathway conferring on BCMA the specific ability to activate this Ag presentation response.
Yang
Min
M
Immunobiology Center, Mount Sinai School of Medicine, New York, NY 10029, USA.
Hase
Hidenori
H
Legarda-Addison
Diana
D
Varughese
Leena
L
Seed
Brian
B
Ting
Adrian T
AT
D000818:Animals; D017951:Antigen Presentation; D053264:B-Cell Activating Factor; D053301:B-Cell Maturation Antigen; D001402:B-Lymphocytes / Q000276:immunology*; D019013:CD40 Antigens / Q000502:physiology; D002460:Cell Line; D048031:JNK Mitogen-Activated Protein Kinases / Q000502:physiology; D008565:Membrane Proteins / Q000502:physiology; D051379:Mice; D016328:NF-kappa B / Q000378:metabolism; D018124:Receptors, Tumor Necrosis Factor / Q000502:physiology*; D015398:Signal Transduction; D053300:Tumor Necrosis Factor Ligand Superfamily Member 13; D014409:Tumor Necrosis Factor-alpha / Q000502:physiology
D053264:B-Cell Activating Factor; D053301:B-Cell Maturation Antigen; D019013:CD40 Antigens; D008565:Membrane Proteins; D016328:NF-kappa B; D018124:Receptors, Tumor Necrosis Factor; C490176:Tnfrsf17 protein, mouse; C491959:Tnfsf13 protein, mouse; C505720:Tnfsf13b protein, mouse; D053300:Tumor Necrosis Factor Ligand Superfamily Member 13; D014409:Tumor Necrosis Factor-alpha; D048031:JNK Mitogen-Activated Protein Kinases