A requirement for FcγR in antibody-mediated bacterial toxin neutralization.

A requirement for FcγR in antibody-mediated bacterial toxin neutralization.
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DOI:
10.1084/jem.20100995
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发表时间:
2010-10-25
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Casadevall A
Casadevall A
中科院分区:
其他
文献类型:
--
作者:
Abboud N;Chow SK;Saylor C;Janda A;Ravetch JV;Scharff MD;Casadevall A

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抗体的恒定区以依赖于FcγR的方式影响毒素中和。体液免疫的一个重要功能是中和毒素。目前的观点认为,中和是由于抗体介导的干扰毒素与其靶标的结合,这种现象被视为仅依赖于抗体特异性。为了研究抗体恒定区功能在毒素中和中的作用,我们产生了炭疽杆菌保护性抗原结合IgG 1单克隆抗体(mAb)19 D9的IgG 2a和IgG 2b变体。这些抗体表达相同的可变区并显示相同的特异性。抗体介导的中和效果为IgG 2a> IgG 2b> IgG 1,中和活性需要感受态Fcγ受体(FcγR)。与IgG 1 mAb相比,IgG 2a mAb更有效地防止了致死性毒素细胞杀伤和丝裂原活化蛋白激酶/细胞外信号调节激酶激酶裂解。IgG 1和IgG 2a mAb被动免疫保护野生型小鼠,但不能保护Fcγ R缺陷小鼠对抗B。炭疽感染。这些结果确定恒定区同种型通过需要FcγR参与的机制影响某些抗体的毒素中和效力。这些发现强调了用于评估疫苗应答的新参数以及在被动免疫策略设计中利用最佳FcγR相互作用的可能性。
Constant regions of antibodies influence toxin neutralization in a manner dependent on FcγR. One important function of humoral immunity is toxin neutralization. The current view posits that neutralization results from antibody-mediated interference with the binding of toxins to their targets, a phenomenon viewed as dependent only on antibody specificity. To investigate the role of antibody constant region function in toxin neutralization, we generated IgG2a and IgG2b variants of the Bacillus anthracis protective antigen–binding IgG1 monoclonal antibody (mAb) 19D9. These antibodies express identical variable regions and display the same specificity. The efficacy of antibody-mediated neutralization was IgG2a > IgG2b > IgG1, and neutralization activity required competent Fcγ receptor (FcγR). The IgG2a mAb prevented lethal toxin cell killing and mitogen-activated protein kinase/extracellular signal-regulated kinase kinase cleavage more efficiently than the IgG1 mAb. Passive immunization with IgG1 and IgG2a mAb protected wild-type mice, but not FcγR-deficient mice, against B. anthracis infection. These results establish that constant region isotype influences toxin neutralization efficacy of certain antibodies through a mechanism that requires engagement of FcγR. These findings highlight a new parameter for evaluating vaccine responses and the possibility of harnessing optimal FcγR interactions in the design of passive immunization strategies.
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影响因子: 4.8
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