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首页> 外文期刊>Cytokine >Engineering human IL-18 with increased bioactivity and bioavailability.
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Engineering human IL-18 with increased bioactivity and bioavailability.

机译:用增强的生物活性和生物利用度改造人IL-18。

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摘要

Cytokines in plasmid form can act as potent adjuvants when co-administered with DNA vaccines, resulting in an enhanced immune response to the DNA-encoded antigen. This is true of interleukin-18 (IL-18), which has been shown to serve as an adjuvant in conjunction with certain DNA vaccines. To determine if the properties of IL-18 could be optimized for use as a DNA vaccine adjuvant, a model of IL-18/IL-18R binding was developed to identify variants of human IL-18 that were predicted to improve receptor interactions and potentially bioactivity. The linkage of mature IL-18 to a secretion signal sequence provided improved protein expression from mammalian cells and signal peptidase cleavage of this protein produced the authentic N-terminus. The IL-18 variant proteins secreted this way were bioactive, as demonstrated by their ability to induce interferon gamma (IFNgamma) expression by human peripheral blood mononuclear cells (PBMCs) and to bind to IL-18R, as demonstrated by BIAcore analysis. The IL-18 variants were inhibited by IL-18 binding protein (IL-18BP), the soluble inhibitor of IL-18, as measured by neutralization of the IFNgamma response in PBMCs. One variant, V11I/T63A, demonstrated increases both in bioactivity and mammalian cell expression as compared to native IL-18, indicating that this molecule may be particularly well suited for use as a DNA-encoded vaccine adjuvant.
机译:与DNA疫苗共同给药时,质粒形式的细胞因子可以作为有效的佐剂,从而增强对DNA编码抗原的免疫反应。白介素-18(IL-18)的情况就是如此,已被证明可与某些DNA疫苗一起用作佐剂。为了确定是否可以优化IL-18的特性以用作DNA疫苗佐剂,开发了IL-18 / IL-18R结合模型来鉴定预计可改善受体相互作用并可能改善人IL-18的变体。生物活性。成熟的IL-18与分泌信号序列的连接提供了来自哺乳动物细胞的改善的蛋白质表达,并且该蛋白质的信号肽酶切割产生了真实的N末端。这种分泌的IL-18变异蛋白具有生物活性,如BIAcore分析所证明的那样,它们具有诱导人外周血单核细胞(PBMC)干扰素γ(IFNgamma)表达并与IL-18R结合的能力。通过中和PBMC中的IFNγ应答,IL-18结合蛋白(IL-18BP)(IL-18的可溶性抑制剂)抑制了IL-18变体。与天然IL-18相比,一种变体V11I / T63A表现出生物活性和哺乳动物细胞表达均增加,表明该分子可能特别适合用作DNA编码疫苗佐剂。

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