IL-18BP mediates the balance between protective and pathological immune responses to Toxoplasma gondii.

IL-18BP mediates the balance between protective and pathological immune responses to Toxoplasma gondii.
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DOI:
10.1016/j.celrep.2023.112147
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发表时间:
2023-03-28
期刊:
影响因子:
8.8
通讯作者:
--
中科院分区:
生物学1区
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白细胞介素-18(IL-18)促进自然杀伤细胞(NK)和T细胞产生干扰素(IFN)-γ,这是抗弓形虫的关键因素,但以前的工作表明内源性IL-18在控制这种寄生虫中的作用有限。虽然T.弓形虫感染导致IL-18的释放,IFN-γ的产生诱导高水平的IL-18结合蛋白(IL-18 BP)。用不发信号而是结合IL-18 BP的“诱饵对诱饵”(D2 D)IL-18构建体拮抗IL-18 BP导致增强的先天淋巴样细胞(ILC)和T细胞应答和改善的寄生虫控制。此外,使用对IL-18 BP具有抗性的IL-18(“诱饵抗性”IL-18 [DR-18])在促进对感染的先天抗性方面比外源性IL-18更有效。DR-18增强了IFN-γ的CD 4 + T细胞产生,但导致CD 4 + T细胞介导的病理学。因此,内源性IL-18 BP抑制异常的免疫病理学,并且本研究强调了可用于调节该调节途径以获得最佳抗病原体应答的策略。Clark等人使用细胞因子IL-18的变体来绕过IL-18结合蛋白的作用,以评估它们对弓形虫感染的影响。这些方法强调了在感染期间,未对抗的IL-18增强了IFN-γ的NK细胞产生,但也可以促进CD 4 + T细胞介导的病理学。
Interleukin-18 (IL-18) promotes natural killer (NK) and T cell production of interferon (IFN)-γ, a key factor in resistance to Toxoplasma gondii, but previous work has shown a limited role for endogenous IL-18 in control of this parasite. Although infection with T. gondii results in release of IL-18, the production of IFN-γ induces high levels of the IL-18 binding protein (IL-18BP). Antagonism of IL-18BP with a “decoy-to-the-decoy” (D2D) IL-18 construct that does not signal but rather binds IL-18BP results in enhanced innate lymphoid cell (ILC) and T cell responses and improved parasite control. In addition, the use of IL-18 resistant to IL-18BP (“decoy-resistant” IL-18 [DR-18]) is more effective than exogenous IL-18 at promoting innate resistance to infection. DR-18 enhances CD4+ T cell production of IFN-γ but results in CD4+ T cell-mediated pathology. Thus, endogenous IL-18BP restrains aberrant immune pathology, and this study highlights strategies that can be used to tune this regulatory pathway for optimal anti-pathogen responses. Clark et al. use variants of the cytokine IL-18 to bypass the effects of the IL-18 binding protein to assess their impact on infection with Toxoplasma gondii. These approaches highlight that during infection, unopposed IL-18 enhances NK cell production of IFN-γ but can also promote CD4+ T cell-mediated pathology.
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