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Optimal stimulation for CD70 induction on human monocyte-derived dendritic cells and the importance of CD70 in naive CD4+ T-cell differentiation

机译:人单核细胞源性树突状细胞对CD70诱导的最佳刺激以及CD70在未成熟CD4 + T细胞分化中的重要性

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摘要

Studies in mice have shown that CD70 on dendritic cells (DCs) is sufficient to convert T-cell tolerance into immunity and hence induce anti-tumour immune responses. Therefore, it is important to investigate (i) optimal stimuli to induce CD70 on human monocyte-derived DCs (MoDCs), which are widely used for tumour immunotherapy, and (ii) the role of CD70 in functional differentiation of naive CD4+ and CD8+ T cells stimulated with MoDCs. We show that interferon-α (IFN-α) is a key cytokine to differentiate monocytes into DCs with the capacity to express CD70 upon maturation. CD70 expression on IFN-α-induced MoDCs was elicited by different categories of maturation-inducing factors (Toll-like receptor ligands, CD40 ligand and pro-inflammatory mediators), among which prostaglandin E2 was most effective. Naive T cells stimulated with MoDCs also expressed CD70. Stimulation with MoDCs promoted naive CD4+ T cells to acquire the ability to produce T helper type 1 and 2 cytokines in a CD70-dependent manner. In contrast, the CD70–CD27 interaction diminished the production of an immunoregulatory cytokine IL-10. The CD27 signal did not play a dominant role in the induction of effector molecules in naive CD8+ T cells during the stimulation with MoDCs. This study adds a novel function to the versatile cytokines, type I IFNs, that is, the induction of CD70 on MoDCs. CD70 promotes naive CD4+ T cells to acquire immunostimulatory activity through the DC–T-cell and T-cell–T-cell interactions during the stimulation with MoDCs. Hence, the CD70–CD27 interaction may play an important role in inducing effective immune responses in DC-based immunotherapy.
机译:小鼠研究表明,树突状细胞(DCs)上的CD70足以将T细胞耐受性转化为免疫力,从而诱导抗肿瘤免疫反应。因此,重要的是研究(i)在人单核细胞衍生的DC(MoDC)上诱导CD70的最佳刺激,该DC已广泛用于肿瘤免疫治疗,以及(ii)CD70在幼稚CD4 功能分化中的作用MoDCs刺激+ 和CD8 + T细胞。我们显示干扰素-α(IFN-α)是一个关键的细胞因子,可将单核细胞分化为DC,并具有在成熟时表达CD70的能力。 CD70在IFN-α诱导的MoDCs上的表达是由不同类型的成熟诱导因子(Toll样受体配体,CD40配体和促炎介质)引起的,其中前列腺素E2最有效。 MoDC刺激的幼稚T细胞也表达CD70。 MoDCs刺激促进了原始CD4 + T细胞获得以CD70依赖性方式产生1型和2型T辅助细胞因子的能力。相反,CD70-CD27相互作用减少了免疫调节细胞因子IL-10的产生。在MoDCs刺激过程中,CD27信号在幼稚CD8 + T细胞的效应分子诱导中没有起主导作用。这项研究为多功能细胞因子I型IFNs添加了新功能,即在MoDCs上诱导CD70。 CD70促进原始CD4 + T细胞在MoDCs刺激过程中通过DC-T细胞和T细胞-T细胞相互作用获得免疫刺激活性。因此,在基于DC的免疫治疗中,CD70–CD27相互作用可能在诱导有效的免疫反应中起重要作用。

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