Ebola virus protein VP40 stimulates IL-12- and IL-18-dependent activation of human natural killer cells.

Ebola virus protein VP40 stimulates IL-12- and IL-18-dependent activation of human natural killer cells.
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埃博拉病毒蛋白VP40刺激人类天然杀伤细胞的IL-12-和IL-18依赖性激活。

DOI:
10.1172/jci.insight.158902
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发表时间:
2022-08-22
期刊:
影响因子:
8
通讯作者:
Singh, Karnail
Singh, Karnail
中科院分区:
医学1区
文献类型:
--
作者:
Le, Hung;Spearman, Paul;Waggoner, Stephen N.;Singh, Karnail

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在埃博拉病毒感染期间,组织中活化的自然杀伤细胞(NK)的积累有助于埃博拉病毒病(EVD)的发病机制。然而,用含有糖蛋白和基质蛋白VP40的埃博拉病毒样颗粒(vlp)免疫可提供快速的NK细胞介导的埃博拉病毒攻击保护。我们使用埃博拉病毒VLPs作为病毒替代物来阐明埃博拉病毒触发NK细胞活性升高的分子机制。用埃博拉病毒VLPs或VP40蛋白培养人外周血单个核细胞,导致CD3-CD56 + NK细胞表达IFN-γ、TNF-α、颗粒酶B和穿孔素增加,同时这些细胞的脱粒和细胞毒活性增加。最佳激活需要辅助细胞,如CD14+髓细胞和CD14 -细胞,并引发大量炎症细胞因子的分泌增加。vp40诱导NK细胞分泌IFN-γ和TNF-α依赖于IL-12和IL-18,受IL-10抑制。相反,它们的脱颗粒增加依赖于IL-12,而IL-18或IL-10的影响很小。这些结果表明,埃博拉病毒VP40以IL-12和il -18依赖的方式刺激NK细胞功能,涉及CD14+和CD14 -辅助细胞。这些潜在的新发现可能有助于设计在埃博拉疫情期间控制病毒传播所需的改进干预策略。
Accumulation of activated natural killer (NK) cells in tissues during Ebola virus infection contributes to Ebola virus disease (EVD) pathogenesis. Yet, immunization with Ebola virus-like particles (VLPs) comprising glycoprotein and matrix protein VP40 provides rapid, NK cell–mediated protection against Ebola challenge. We used Ebola VLPs as the viral surrogates to elucidate the molecular mechanism by which Ebola virus triggers heightened NK cell activity. Incubation of human peripheral blood mononuclear cells with Ebola VLPs or VP40 protein led to increased expression of IFN-γ, TNF-α, granzyme B, and perforin by CD3–CD56+ NK cells, along with increases in degranulation and cytotoxic activity of these cells. Optimal activation required accessory cells like CD14+ myeloid and CD14– cells and triggered increased secretion of numerous inflammatory cytokines. VP40-induced IFN-γ and TNF-α secretion by NK cells was dependent on IL-12 and IL-18 and suppressed by IL-10. In contrast, their increased degranulation was dependent on IL-12 with little influence of IL-18 or IL-10. These results demonstrate that Ebola VP40 stimulates NK cell functions in an IL-12– and IL-18–dependent manner that involves CD14+ and CD14– accessory cells. These potentially novel findings may help in designing improved intervention strategies required to control viral transmission during Ebola outbreaks.
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