Protection conferred by mucosal novel bivalent Klebsiella pneumoniae vaccine immunization associates with presence of lung CD4+ TRM.

IF 2.6 4区 医学 Q3 IMMUNOLOGY
BiXia Liu, YaRu Gu, YangXue Ou, LuXuan Liu, WenHao Wang, JinRui Zhou, Ying Wang, YeXiang Du, Jing Xie, Yuan Liu, Rui Zhang, QianFei Zuo, Bin Wang
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Abstract

Klebsiella pneumoniae is the principal cause of hospital-acquired infection with a high morbidity and mortality in immunocompromised individuals, yet no vaccine is approved. Here, we developed a novel bivalent subunit vaccine for the prevention of K. pneumoniae infection based on the outer membrane protein GlnH and the fimbriae protein FimA. The survival rate of immunized mice was significantly increased compared to that of unimmunized mice, while the bacterial burden, weight loss, and lung pathology were drastically reduced. Furthermore, vaccine-elicited CD4+ TRM cells were observed in lung tissues and appeared to play a critical role in vaccine efficacy. Transcriptomic analysis of total lung tissues from mice treated by FTY720 (S1PR1 inhibitor that blocks lymphocyte egress from secondary lymphoid structures) showed that cell activation, cytokine secretion and enhancement of the killing ability of neutrophils were related to the mechanism of protection against K. pneumoniae infection. These findings indicate that GlnH and FimA are effective candidate bivalent vaccine to fight K. pneumoniae infection.

粘膜新型二价肺炎克雷伯菌疫苗免疫所赋予的保护与肺CD4+ TRM的存在有关。
肺炎克雷伯菌是医院获得性感染的主要原因,在免疫功能低下的个体中具有高发病率和死亡率,但尚未批准疫苗。本研究基于肺炎克雷伯菌外膜蛋白GlnH和菌膜蛋白FimA,研制了一种预防肺炎克雷伯菌感染的新型二价亚单位疫苗。与未免疫小鼠相比,免疫小鼠的存活率显著提高,细菌负担、体重减轻和肺部病理明显减轻。此外,在肺组织中观察到疫苗诱导的CD4+ TRM细胞,并似乎在疫苗疗效中发挥关键作用。FTY720 (S1PR1抑制剂,阻断淋巴细胞从次级淋巴样结构的出口)处理小鼠的全肺组织转录组学分析表明,细胞活化、细胞因子分泌和中性粒细胞杀伤能力的增强与肺炎克雷伯菌感染的保护机制有关。这些结果表明GlnH和FimA是抗肺炎克雷伯菌感染的有效候选二价疫苗。
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来源期刊
Microbes and Infection
Microbes and Infection 医学-病毒学
CiteScore
12.60
自引率
1.70%
发文量
90
审稿时长
40 days
期刊介绍: Microbes and Infection publishes 10 peer-reviewed issues per year in all fields of infection and immunity, covering the different levels of host-microbe interactions, and in particular: the molecular biology and cell biology of the crosstalk between hosts (human and model organisms) and microbes (viruses, bacteria, parasites and fungi), including molecular virulence and evasion mechanisms. the immune response to infection, including pathogenesis and host susceptibility. emerging human infectious diseases. systems immunology. molecular epidemiology/genetics of host pathogen interactions. microbiota and host "interactions". vaccine development, including novel strategies and adjuvants. Clinical studies, accounts of clinical trials and biomarker studies in infectious diseases are within the scope of the journal. Microbes and Infection publishes articles on human pathogens or pathogens of model systems. However, articles on other microbes can be published if they contribute to our understanding of basic mechanisms of host-pathogen interactions. Purely descriptive and preliminary studies are discouraged.
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