Abstract:
:BR3, which is expressed on all mature B cells, is a specific receptor for the B-cell survival and maturation factor BAFF (B-cell-activating factor belonging to the tumor necrosis factor [TNF] family). In order to investigate the consequences of targeting BR3 in murine models and to assess the potential of BR3 antibodies as human therapeutics, synthetic antibody phage libraries were employed to identify BAFF-blocking antibodies cross-reactive to murine and human BR3, which share 52% identity in their extracellular domains. We found an antibody, CB1, which exhibits muM affinity for murine BR3 and very weak affinity for the human receptor. CB3s, an affinity-matured variant of CB1, has sub-nM affinity for BR3 from both species. Alanine scanning and crystallographic structural analysis of the CB3s/BR3 complex reveal that CB3s mimics BAFF by interacting with a similar region of the BR3 surface. Despite this similarity in binding epitopes, CB1 variants antagonize BAFF-dependent human B-cell proliferation in vitro and are effective at reducing murine B-cell populations in vivo, showing significant promise as therapeutics for human B-cell-mediated diseases.
journal_name
Bloodjournal_title
Bloodauthors
Lee CV,Hymowitz SG,Wallweber HJ,Gordon NC,Billeci KL,Tsai SP,Compaan DM,Yin J,Gong Q,Kelley RF,DeForge LE,Martin F,Starovasnik MA,Fuh Gdoi
10.1182/blood-2006-03-011031subject
Has Abstractpub_date
2006-11-01 00:00:00pages
3103-11issue
9eissn
0006-4971issn
1528-0020pii
blood-2006-03-011031journal_volume
108pub_type
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