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2015 ; 290
(26
): 16330-42
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gab.com Text
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English Wikipedia
Stoichiometry of Heteromeric BAFF and APRIL Cytokines Dictates Their Receptor
Binding and Signaling Properties
#MMPMID25953898
Schuepbach-Mallepell S
; Das D
; Willen L
; Vigolo M
; Tardivel A
; Lebon L
; Kowalczyk-Quintas C
; Nys J
; Smulski C
; Zheng TS
; Maskos K
; Lammens A
; Jiang X
; Hess H
; Tan SL
; Schneider P
J Biol Chem
2015[Jun]; 290
(26
): 16330-42
PMID25953898
show ga
The closely related TNF family ligands B cell activation factor (BAFF) and a
proliferation-inducing ligand (APRIL) serve in the generation and maintenance of
mature B-lymphocytes. Both BAFF and APRIL assemble as homotrimers that bind and
activate several receptors that they partially share. However, heteromers of BAFF
and APRIL that occur in patients with autoimmune diseases are incompletely
characterized. The N and C termini of adjacent BAFF or APRIL monomers are
spatially close and can be linked to create single-chain homo- or hetero-ligands
of defined stoichiometry. Similar to APRIL, heteromers consisting of one BAFF and
two APRILs (BAA) bind to the receptors B cell maturation antigen (BCMA),
transmembrane activator and CAML interactor (TACI) but not to the BAFF receptor
(BAFFR). Heteromers consisting of one APRIL and two BAFF (ABB) bind to TACI and
BCMA and weakly to BAFFR in accordance with the analysis of the receptor
interaction sites in the crystallographic structure of ABB. Receptor binding
correlated with activity in reporter cell line assays specific for BAFFR, TACI,
or BCMA. Single-chain BAFF (BBB) and to a lesser extent single-chain ABB, but not
APRIL or single-chain BAA, rescued BAFFR-dependent B cell maturation in
BAFF-deficient mice. In conclusion, BAFF-APRIL heteromers of different
stoichiometries have distinct receptor-binding properties and activities. Based
on the observation that heteromers are less active than BAFF, we speculate that
their physiological role might be to down-regulate BAFF activity.