首页> 美国卫生研究院文献>The Journal of Clinical Investigation >Endogenous production of interleukin 15 by activated human monocytes is critical for optimal production of interferon-gamma by natural killer cells in vitro.
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Endogenous production of interleukin 15 by activated human monocytes is critical for optimal production of interferon-gamma by natural killer cells in vitro.

机译:活化的人类单核细胞的内源性白介素15产生对于体外自然杀伤细胞最佳产生干扰素-γ至关重要。

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摘要

Natural killer (NK) cells are large granular lymphocytes that constitutively express functional IL-2 receptors. We have shown that recombinant human IL-15 uses the IL-2 receptor to activate human NK cells and can synergize with recombinant human IL-12 to stimulate NK cell production of IFN-gamma in vitro. IFN-gamma production by NK cells is critical in the prevention of overwhelming infection by obligate intracellular microbial pathogens in several experimental animal models. Herein, we demonstrate that human monocytes produce IL-15 protein within 5 h of activation with LPS. Using an IL-15-neutralizing antiserum in a coculture of LPS-activated monocytes and NK cells, we demonstrate that monocyte-derived IL-15 is critical for optimal NK cell production of IFN-gamma. Endogenous IL-15 activates NK cells through the IL-2 receptor, and with endogenous IL-12, regulates NK cell IFN-gamma after monocyte activation by LPS. These in vitro studies are the first to characterize a function for endogenous IL-15, and as such, suggest an important role for IL-15 during the innate immune response. IL-15 may be an important ligand for the NK cell IL-2 receptor in vivo.
机译:自然杀手(NK)细胞是大颗粒淋巴细胞,组成性表达功能性IL-2受体。我们已经表明,重组人IL-15使用IL-2受体激活人NK细胞,并且可以与重组人IL-12协同作用,在体外刺激NK细胞产生IFN-γ。在几种实验动物模型中,NK细胞产生的IFN-γ在预防专性细胞内微生物病原体引起的压倒性感染方面至关重要。在本文中,我们证明人单核细胞在被LPS激活的5小时内产生IL-15蛋白。在LPS激活的单核细胞和NK细胞的共培养物中使用IL-15中和的抗血清,我们证明了单核细胞衍生的IL-15对于IFN-γ的最佳NK细胞生产至关重要。内源性IL-15通过IL-2受体激活NK细胞,并与内源性IL-12一起通过LPS激活单核细胞后调节NK细胞IFN-γ。这些体外研究是第一个表征内源性IL-15功能的研究,因此,暗示了IL-15在先天免疫应答过程中的重要作用。 IL-15可能是体内NK细胞IL-2受体的重要配体。

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