Impact of Human IgA Antibodies on Complement-Dependent Cytotoxicity Mediated by Combinations of EGF-R-Directed Antibodies

被引:8
|
作者
Lohse, Stefan [1 ]
Peipp, Matthias [2 ]
Beyer, Thomas [1 ]
Valerius, Thomas [2 ]
Dechant, Michael [1 ]
机构
[1] Univ Kiel, Dept Internal Med Nephrol & Hypertens 4, D-24105 Kiel, Germany
[2] Univ Kiel, Dept Internal Med 2, Div Stem Cell Transplantat & Immunotherapy, D-24105 Kiel, Germany
关键词
IgA; Complement; CDC; GROWTH-FACTOR RECEPTOR; HUMAN-SERUM IGA; EFFECTOR MECHANISMS; SOLUTION SCATTERING; IMMUNOGLOBULIN-A; RECOMBINANT IGA; NEXT-GENERATION; CANCER-THERAPY; SECRETORY IGA; FC-RECEPTORS;
D O I
10.1007/s00005-010-0081-2
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
Dual combinations of non-crossblocking epidermal growth factor receptor (EGF-R)-directed monoclonal antibodies were demonstrated to effectively induce complement-dependent cytotoxicity (CDC) of tumor cells, whereas individual antibodies were ineffective. Here the modulating effects of different antibody isotypes on CDC were studied by adding them as a third antibody. Two different combinations of non-crossblocking EGF-R antibodies of human IgG1 isotype, 018/003 and 425/005, were investigated against the A431 and A1207 cell lines. As a third antibody, human IgG1, IgA1, and IgA2 isotype variants of the therapeutic EGF-R antibody 225 were employed that bind to an EGF-R epitope distinct from the other EGF-R antibodies. In this model, the human IgG1 antibody proved to further enhance CDC, whereas both IgA antibodies significantly blocked CDC. The IgG1 and IgA variants increased target opsonization at similar levels, but the isotypes differed in their effects on C1q fixation. Addition of IgG1 significantly enhanced complement factor binding on the target surface, whereas both IgA antibodies reduced complement binding. Control experiments revealed this blocking effect to be not specific to IgA antibodies, but to antibody constructs incapable of activating the complement system. Interestingly, the effects caused by the IgA2 isotype were consistently stronger than those by IgA1, which may be caused by stronger steric hindrance due to its reduced hinge flexibility. These results demonstrate that monoclonal IgA antibodies inhibit IgG-mediated complement activation in vitro and suggest that the appearance of IgA antibodies within a polyclonal immune response might inhibit complement activation in vivo.
引用
收藏
页码:303 / 312
页数:10
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