A Novel Chimeric Anti-PA Neutralizing Antibody for Postexposure Prophylaxis and Treatment of Anthrax.

A Novel Chimeric Anti-PA Neutralizing Antibody for Postexposure Prophylaxis and Treatment of Anthrax.
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一种用于炭疽暴露后预防和治疗的新型嵌合抗 PA 中和抗体

DOI:
10.1038/srep11776
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发表时间:
2015-07-02
期刊:
影响因子:
4.6
通讯作者:
Zhu J
Zhu J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Xiong S;Tang Q;Liang X;Zhou T;Yang J;Liu P;Chen Y;Wang C;Feng Z;Zhu J

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炭疽病是由炭疽杆菌引起的一种高致死性传染病,其引起的休克与炭疽杆菌产生的致死毒素(LeTx)密切相关。LeTx的63 kDa保护性抗原(PA 63)区域在炭疽的病理生理学中发挥的中心作用使其成为极好的治疗靶点。本研究利用抗体工程技术,将鼠源抗体可变区插入人源抗体恒定区,构建了人/鼠嵌合IgG mAb hmPA 6。hmPA 6在293 F细胞中表达,在体外和体内均能中和LeTx。在0.3mg/kg剂量下,它可以保护所有受试大鼠免受致死剂量的LeTx。甚至在LeTx攻击前48 h给予0.6 mg/kg hmPA 6保护所有测试大鼠。结果表明,hmPA 6是一个潜在的候选临床应用在炭疽治疗。
Anthrax is a highly lethal infectious disease caused by the bacteriumBacillus anthracisand the associated shock is closely related to the lethal toxin (LeTx) produced by the bacterium. The central role played by the 63 kDa protective antigen (PA63) region of LeTx in the pathophysiology of anthrax makes it an excellent therapeutic target. In the present study, a human/murine chimeric IgG mAb, hmPA6, was developed by inserting murine antibody variable regions into human constant regions using antibody engineering technology. hmPA6 expressed in 293F cells could neutralize LeTx bothin vitroandin vivo. At a dose of 0.3 mg/kg, it could protect all tested rats from a lethal dose of LeTx. Even administration of 0.6 mg/kg hmPA6 48 h before LeTx challenge protected all tested rats. The results indicate that hmPA6 is a potential candidate for clinical application in anthrax treatment.
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