Working correlates of protection predict SchuS4-derived-vaccine candidates with improved efficacy against an intracellular bacterium, Francisella tularensis.

Working correlates of protection predict SchuS4-derived-vaccine candidates with improved efficacy against an intracellular bacterium, Francisella tularensis.
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DOI:
10.1038/s41541-022-00506-9
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发表时间:
2022-08-17
期刊:
影响因子:
9.2
通讯作者:
--
中科院分区:
医学1区
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--
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土拉热弗朗西斯菌是兔热病的病原体,被列为具有生物恐怖主义潜力的一级精选病原体。唯一可用的疫苗 LVS 的功效尚不确定,并且未在美国获得许可。此前,通过使用普遍适用于细胞内病原体的方法,我们确定了预测啮齿类动物成功接种疫苗的工作相关性。在这里,我们应用这些相关性来评估一组 SchuS4 衍生的减毒活疫苗,即 SchuS4-ΔclpB、ΔclpB-ΔfupA、ΔclpB-ΔcapB 和 ΔclpB-ΔwbtC。我们结合体外共培养来量化啮齿动物 T 细胞功能和多变量回归分析来预测相对疫苗强度。这些预测通过大鼠疫苗接种和攻击研究进行了测试,证明了体外测量的层次结构与体内疫苗保护之间存在明确的关系。因此,这些研究证明了一组相关因素筛选和预测弗朗西斯氏菌候选疫苗功效的潜在能力,并且 Fischer 344 只大鼠的体内研究证实,SchuS4-ΔclpB 和 ΔclpB-ΔcapB 可能是比 LVS 更好的候选疫苗。
Francisella tularensis, the causative agent of tularemia, is classified as Tier 1 Select Agent with bioterrorism potential. The efficacy of the only available vaccine, LVS, is uncertain and it is not licensed in the U.S. Previously, by using an approach generally applicable to intracellular pathogens, we identified working correlates that predict successful vaccination in rodents. Here, we applied these correlates to evaluate a panel of SchuS4-derived live attenuated vaccines, namely SchuS4-ΔclpB, ΔclpB-ΔfupA, ΔclpB-ΔcapB, and ΔclpB-ΔwbtC. We combined in vitro co-cultures to quantify rodent T-cell functions and multivariate regression analyses to predict relative vaccine strength. The predictions were tested by rat vaccination and challenge studies, which demonstrated a clear relationship between the hierarchy of in vitro measurements and in vivo vaccine protection. Thus, these studies demonstrated the potential power a panel of correlates to screen and predict the efficacy of Francisella vaccine candidates, and in vivo studies in Fischer 344 rats confirmed that SchuS4-ΔclpB and ΔclpB-ΔcapB may be better vaccine candidates than LVS.
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