Protective effects of the Francisella tularensis ΔpdpC mutant against its virulent parental strain SCHU P9 in Cynomolgus macaques

Protective effects of the Francisella tularensis ΔpdpC mutant against its virulent parental strain SCHU P9 in Cynomolgus macaques
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土拉弗朗西斯菌 ΔpdpC 突变体对其毒力亲本菌株 SCHU P9 在食蟹猴中的保护作用

DOI:
10.1038/s41598-019-45412-8
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发表时间:
2019
期刊:
Scientific Report
影响因子:
--
通讯作者:
Shigeru Morikawa
Shigeru Morikawa
中科院分区:
--
文献类型:
--
作者:
Deyu Tian;Akihiko Uda;Yasushi Ami;Akitoyo Hotta;Eun-sil Park;Noriyo Nagata;Naoko Iwata-Yoshikawa;Akio Yamada;Kazuhiro Hirayama;Kozue Miura;Yuki Koyama;Mika Azaki;Shigeru Morikawa

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土拉菌病是由土拉弗朗西斯菌引起的人畜共患传染病。虽然F。土拉热病由于其高传染性和高死亡率而被认为是一种潜在的生物武器,目前还没有批准疫苗。最近,我们报道了F.缺乏致病性决定蛋白C基因的土拉菌SCHUP9衍生的Δ pdpC菌株在小鼠致死模型中提供了稳定和良好的保护。在这项研究中,使用猴致死模型评估Δ pdpC的保护作用。在攻毒后7天和11天,在出现重度临床体征后,对用强毒株SCHU P9进行肠内攻毒的两只食蟹猴(Macaca fascicularis)实施安乐死。细菌在肺泡巨噬细胞和肺内II型上皮细胞中复制,可引起严重的肺炎并伴有坏死。相反,用Δ pdpC皮下免疫的两只动物在SCHU P9攻击后存活3周。虽然两只动物中的一只出现了轻微的兔热病症状,但呼吸器官中的细菌复制受到限制,这可能是由于对F的体液和细胞免疫应答水平较高。土拉热。这些结果表明,Δ pdpC突变体是一种安全和有希望的兔热病减毒活疫苗候选者。
Tularemia is a severe infectious zoonotic disease caused byFrancisella tularensis. AlthoughF. tularensisis considered to be a potential biological weapon due to its high infectivity and mortality rate, no vaccine has been currently licensed. Recently, we reported thatF. tularensisSCHU P9 derived ΔpdpCstrain lacking the pathogenicity determinant protein C gene conferred stable and good protection in a mouse lethal model. In this study, the protective effect of ΔpdpCwas evaluated using a monkey lethal model. Two cynomolgus macaques (Macaca fascicularis) intratracheally challenged with the virulent strain SCHU P9 were euthanized on 7 and 11 days post-challenge after the development of severe clinical signs. The bacterial replication in alveolar macrophages and type II epithelial cells in the lungs would cause severe pneumonia accompanied by necrosis. Conversely, two animals subcutaneously immunized with ΔpdpCsurvived 3 weeks after SCHU P9 challenge. Though one of the two animals developed mild symptoms of tularemia, bacterial replication was limited in the respiratory organs, which may be due to a high level of humoral and cellular immune responses againstF. tularensis. These results suggest that the ΔpdpCmutant would be a safe and promising candidate as a live attenuated tularemia vaccine.
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