Absolute requirement for complement in monoclonal IgM antibody-mediated protection against experimental infection with type III group B streptococci.

Absolute requirement for complement in monoclonal IgM antibody-mediated protection against experimental infection with type III group B streptococci.
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单克隆 IgM 抗体介导的针对 III 型 B 型链球菌实验性感染的保护对补体的绝对需求。

DOI:
10.1093/infdis/150.1.63
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发表时间:
1984
期刊:
The Journal of infectious diseases
影响因子:
--
通讯作者:
Hill,HR
Hill,HR
中科院分区:
--
文献类型:
--
作者:
Shigeoka,AO;Jensen,CL;Pincus,SH;Hill,HR

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在新生大鼠感染模型和以人血清为补体来源的体外实验中,研究了补体在抗III型B族链球菌(GBS)单克隆IgM抗体的保护和调理活性中的作用。未感染新生大鼠的C3水平<成年大鼠的50%,与在人类新生儿中观察到的低补体水平相似。单克隆III型特异性IgM抗体为腹腔内或鼻内感染III型GBS的新生大鼠(补体水平不变)提供保护。相比之下,通过给予眼镜蛇毒因子而耗尽补体的新生大鼠不受IgM抗体的保护。在体外,经典的补体途径活性是足够的,从良好的,足月新生儿和GBS感染的新生儿的血清中存在较高浓度的单克隆IgM抗体。然而,在较低的IgM水平下,替代补体途径在新生儿血清和成人血清中的效率较低。
The role of complement in the protective and opsonic activity of monoclonal IgM antibody to type III group B streptococci (GBS) was examined in a neonatal rat model of infection and in vitro with human sera as the complement source. C3 levels in uninfected neonatal rats were <50% of those in adult rats, similar to the low complement levels observed in human neonates. The monoclonal type III-specific IgM antibody provided protection to neonatal rats (with unaltered complement levels) that were infected intraperitoneally or intranasally with type III GBS. In contrast, neonatal rats depleted of complement by administration of cobra venom factor were not protected by IgM antibody. In vitro, classical complement pathway activity was adequate in sera from well, term neonates and GBS-infected neonates in the presence of higher concentrations of the monoclonal IgM antibody. At lower IgM levels, however, the alternative complement pathway was less efficient in both neonatal sera and adult sera.
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