TY - JOUR
T1 - The proteoglycan (heparan sulfate proteoglycan) binding domain of APRIL serves as a platform for ligand multimerization and cross-linking
AU - Kimberley, Fiona C.
AU - van Bostelen, Liesbeth
AU - Cameron, Katherine
AU - Hardenberg, Gijs
AU - Marquart, J. Arnoud
AU - Hahne, Michael
AU - Medema, Jan Paul
PY - 2009
Y1 - 2009
N2 - A proliferation-inducing ligand (APRIL) (also known as TALL-2 and TRDL-1) is a member of the tumor necrosis factor (TNF) superfamily that has tumorigenic properties but is also important for the induction of humoral immune responses. APRIL binds two TNF receptors: transmembrane activator and calcium modulator and cyclophilin ligand interactor (TACI) and B-cell maturation antigen (BCMA) as well as heparan sulfate proteoglycans (HSPGs). The aim of this study was to clarify the role of the HSPG interaction in canonical APRIL signaling, because it has been proposed to act as a docking site and also to play a role in direct signaling. In this study, we generated point mutants of soluble APRIL that lack either the capacity to bind HSPGs or TACI and BCMA and then tested the function of these mutants in mouse B-cell assays. In contrast to previous reports, we found that APRIL alone is sufficient to costimulate B-cell proliferation and drive IgA production and does not require artificial antibody cross-linking. We found no evidence that APRIL requires signaling through HSPGs but, notably, were able to show that binding of APRIL to HSPGs is crucial for mediating natural APRIL cross-linking to allow for optimal activation of murine B cells.-Kimberley, F. C., van Bostelen, L., Cameron, K., Hardenberg, G., Marquart, J. A., Hahne, M., Medema, J. P. The proteoglycan (heparan sulfate proteoglycan) binding domain of APRIL serves as a platform for ligand multimerization and cross-linking. FASEB J. 23, 1584-1595 (2009)
AB - A proliferation-inducing ligand (APRIL) (also known as TALL-2 and TRDL-1) is a member of the tumor necrosis factor (TNF) superfamily that has tumorigenic properties but is also important for the induction of humoral immune responses. APRIL binds two TNF receptors: transmembrane activator and calcium modulator and cyclophilin ligand interactor (TACI) and B-cell maturation antigen (BCMA) as well as heparan sulfate proteoglycans (HSPGs). The aim of this study was to clarify the role of the HSPG interaction in canonical APRIL signaling, because it has been proposed to act as a docking site and also to play a role in direct signaling. In this study, we generated point mutants of soluble APRIL that lack either the capacity to bind HSPGs or TACI and BCMA and then tested the function of these mutants in mouse B-cell assays. In contrast to previous reports, we found that APRIL alone is sufficient to costimulate B-cell proliferation and drive IgA production and does not require artificial antibody cross-linking. We found no evidence that APRIL requires signaling through HSPGs but, notably, were able to show that binding of APRIL to HSPGs is crucial for mediating natural APRIL cross-linking to allow for optimal activation of murine B cells.-Kimberley, F. C., van Bostelen, L., Cameron, K., Hardenberg, G., Marquart, J. A., Hahne, M., Medema, J. P. The proteoglycan (heparan sulfate proteoglycan) binding domain of APRIL serves as a platform for ligand multimerization and cross-linking. FASEB J. 23, 1584-1595 (2009)
U2 - https://doi.org/10.1096/fj.08-124669
DO - https://doi.org/10.1096/fj.08-124669
M3 - Article
C2 - 19141538
SN - 0892-6638
VL - 23
SP - 1584
EP - 1595
JO - FASEB Journal
JF - FASEB Journal
IS - 5
ER -