B cell activating factor (BAFF) is one of the TNF family member, regulates the survival and maturation of B lymphocyte. BAFF binds to three receptors: BCMA, TACI and BAFF-R. In recent years, studies have revealed important roles of BAFF and its receptors in immune regulation of antibody isotype switching, germinal center maintenance, and T cell co-stimulation, that may provide new drugs in the future for the treatment of autoimmune disorders, lymphoma and B cell immunodeficiencies. Therefore, the structure, expression, receptors, biological function and clinical application of BAFF are briefly summarized in this review.
B-Cell Activating Factor ; immunology ; B-Cell Activation Factor Receptor ; immunology ; B-Cell Maturation Antigen ; immunology ; B-Lymphocytes ; immunology ; Humans ; Immunity ; Transmembrane Activator and CAML Interactor Protein ; immunology

B lymphocyte stimulator (BLyS), a tumor neurosis factor ligand superfamily, is an important factor of B cell survival and activation. However, BLyS also regulates T cell activation and survival, playing key roles in T cell-mediated autoimmune disorders. In the paper, we introduced the mechanisms of BLyS and a proliferation-inducing ligand (APRIL) regulating T cell responses and their roles in rheumatoid arthritis (RA).
Animals ; Antibodies, Monoclonal, Humanized ; therapeutic use ; Arthritis, Rheumatoid ; drug therapy ; metabolism ; pathology ; B-Cell Activating Factor ; metabolism ; B-Cell Activation Factor Receptor ; metabolism ; B-Cell Maturation Antigen ; metabolism ; B-Lymphocytes ; metabolism ; pathology ; Humans ; Lymphocyte Activation ; Recombinant Fusion Proteins ; therapeutic use ; T-Lymphocytes ; metabolism ; pathology ; Transmembrane Activator and CAML Interactor Protein ; metabolism ; Tumor Necrosis Factor Ligand Superfamily Member 13 ; metabolism

Asthma was induced by the sensitization and challenge with ovalbumin (OVA) in mice. B-cell activating factor (BAFF) plays a role in mature B cell generation and maintenance. Here, we investigated whether, BAFF expression was changed in OVA-induced mice and whether the control of BAFF expression level alleviates the symptom of bronchial asthma. BAFF expression was detected in alveolar-associated cells surrounding bronchi of OVA-induced mouse lung tissues. BAFF protein was also increased in OVA-induced mouse serum. The increased BAFF transcripts was detected in OVA-induced mouse splenocytes. OVA-induced asthma was associated with the increased number of eosinophils in bronchoalveolar lavage fluid (BALF). When TACI:Fc scavenging soluble BAFF was injected to OVA-induced mice, a significant inhibition was detected in the thickness of airway smooth muscle and glycol-containing cellular elements in airway that were visualized by hematoxylin/eosin Y and periodic acid-Schiff staining, respectively. In addition, when mice were treated with TACI:Fc protein, BAFF protein level was decreased in alveolar-associated cells surrounding bronchi of OVA-induced mouse lung tissues compared to control mice. When compared to OVA-induced control, TACI:Fc treatment reduced the percentage of non-lymphoid cells and no changes were detected in lymphoid cell population. Hypodiploid cell formation in BALF was decreased by OVA-challenge but it was recovered by TACI:Fc treatment. Collectively, data suggest that asthmatic symptom could be alleviated by scavenging BAFF and then BAFF could be a novel target for the develpoment of anti-asthmatic agents.
Animals ; Apoptosis ; Asthma/chemically induced/*drug therapy/immunology ; B-Cell Activating Factor/*biosynthesis ; Bronchi/metabolism/pathology ; Bronchoalveolar Lavage Fluid/cytology ; Eosinophils/pathology ; Female ; Humans ; Immunoglobulin Fc Fragments/*genetics ; Immunoglobulin G/*genetics ; Lymphocytes/pathology ; Mice ; Mice, Inbred BALB C ; *Ovalbumin ; Pulmonary Alveoli/metabolism ; Recombinant Fusion Proteins/genetics/*therapeutic use ; Spleen/metabolism ; Transmembrane Activator and CAML Interactor Protein/*genetics