A novel human IgA monoclonal antibody protects against tuberculosis.
A novel human IgA monoclonal antibody protects against tuberculosis.
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DOI:
10.4049/jimmunol.1003189
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发表时间:
2011-03-01
期刊:
影响因子:
--
通讯作者:
Ivanyi J
中科院分区:
文献类型:
--
作者:
Balu S;Reljic R;Lewis MJ;Pleass RJ;McIntosh R;van Kooten C;van Egmond M;Challacombe S;Woof JM;Ivanyi J
Abs have been shown to be protective in passive immunotherapy of tuberculous infection using mouse experimental models. In this study, we report on the properties of a novel human IgA1, constructed using a single-chain variable fragment clone (2E9), selected from an Ab phage library. The purified Ab monomer revealed high binding affinities for the mycobacterial α-crystallin Ag and for the human FcαRI (CD89) IgA receptor. Intranasal inoculations with 2E9IgA1 and recombinant mouse IFN-γ significantly inhibited pulmonary H37Rv infection in mice transgenic for human CD89 but not in CD89-negative littermate controls, suggesting that binding to CD89 was necessary for the IgA-imparted passive protection. 2E9IgA1 added to human whole-blood or monocyte cultures inhibited luciferase-tagged H37Rv infection although not for all tested blood donors. Inhibition by 2E9IgA1 was synergistic with human rIFN-γ in cultures of purified human monocytes but not in whole-blood cultures. The demonstration of the mandatory role of FcαRI (CD89) for human IgA-mediated protection is important for understanding of the mechanisms involved and also for translation of this approach toward development of passive immunotherapy of tuberculosis.
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