A monoclonal antibody with anti-D-like activity in murine immune thrombocytopenia requires Fc domain function for immune thrombocytopenia ameliorative effects.

Abstract:

BACKGROUND:The mechanism of action of anti-D in ameliorating immune thrombocytopenia (ITP) remains unclear. The monoclonal antibody (MoAb) Ter119, which targets murine red blood cells (RBCs), has been shown to mimic the effect of anti-D in improving antibody-mediated murine ITP. The mechanism of Ter119-mediated ITP amelioration, especially the role of the antigen-binding and Fc domains, remains untested. A functional Fc domain is crucial for many therapeutic MoAb activity; therefore, the requirement of Ter119 Fc domain in ITP amelioration is investigated using outbred CD-1 mice. STUDY DESIGN AND METHODS:Ter119 variants, including Ter119 F(ab')2 fragments, deglycosylated Ter119, and afucosylated Ter119, were generated to test their effect in ameliorating antibody-induced murine ITP. In vivo inhibition of FcγRIII and FcγRIIB was achieved using the Fab fragment of the FcγRIII/FcγRIIB-specific MoAb 2.4G2. RESULTS:Ter119 F(ab')2 fragments and deglycosylated Ter119 were unable to ameliorate murine ITP or mediate phagocytosis of RBCs by RAW264.7 macrophages in vitro. Inhibition of FcγRIII and FcγRIIB, as well as Ter119 defucosylation, do not affect Ter119-mediated ITP amelioration. CONCLUSION:The Fc domain of Ter119, as well as its Fc glycosylation, is required for Ter119-mediated ITP amelioration. Moreover, both Fc and Fc glycosylation are required for Ter119-mediated phagocytosis in vitro. These findings demonstrate the importance of the Fc domain in a therapeutic MoAb with anti-D-like activity.

journal_name

Transfusion

journal_title

Transfusion

authors

Yu X,Menard M,Seabright G,Crispin M,Lazarus AH

doi

10.1111/trf.13032

subject

Has Abstract

pub_date

2015-06-01 00:00:00

pages

1501-11

issue

6 Pt 2

eissn

0041-1132

issn

1537-2995

journal_volume

55

pub_type

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