Canthaboo C, Xing D, Wei X Q, Corbel M J
Division of Bacteriology, National Institute for Biological Standards and Control, South Mimms, Potters Bar, Hertfordshire, EN6 3QG, United Kingdom.
Infect Immun. 2002 Feb;70(2):679-84. doi: 10.1128/IAI.70.2.679-684.2002.
The mechanism whereby whole-cell pertussis vaccines (WCV) confer protection against Bordetella pertussis is still not fully understood. We have previously reported that macrophage activation produced by vaccination with WCV is associated with induction of NO synthesis by macrophages in response to in vitro stimulation with B. pertussis antigens. To determine whether NO production is an effector of protection or simply a marker of activation, the susceptibility of inducible nitric oxide synthase (type II, iNOS) knockout mice to infection with B. pertussis was examined. We showed that iNOS knockout mice were more susceptible to B. pertussis respiratory challenge than wild-type mice. iNOS-deficient mice also developed a less effective protective response than wild-type mice after the same immunization with WCV. This suggests that NO plays an important role in effecting protection against B. pertussis challenge.
全细胞百日咳疫苗(WCV)提供针对百日咳博德特氏菌的保护作用的机制仍未完全了解。我们之前报道过,接种WCV所产生的巨噬细胞激活与巨噬细胞在体外受到百日咳博德特氏菌抗原刺激时诱导合成一氧化氮(NO)有关。为了确定NO的产生是保护作用的效应因子还是仅仅是激活的标志物,我们检测了诱导型一氧化氮合酶(II型,iNOS)基因敲除小鼠对百日咳博德特氏菌感染的易感性。我们发现,iNOS基因敲除小鼠比野生型小鼠对百日咳博德特氏菌的呼吸道攻击更易感。在用WCV进行相同免疫后,iNOS缺陷小鼠也比野生型小鼠产生的保护性反应效果更差。这表明NO在针对百日咳博德特氏菌攻击的保护作用中发挥重要作用。