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Expression of IL-8 gene in human monocytes and lymphocytes: differential regulation by TNF and IL-1.

机译:IL-8基因在人单核细胞和淋巴细胞中的表达:TNF和IL-1的差异调节。

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TNF-alpha and IL-1 were reported to be the most powerful inducers of IL-8 in a multitude of cells, including leukocytes. In this study, we investigated TNF-alpha- and IL-1-mediated regulation of IL-8 gene expression in non-fractionated PBMC, and purified monocyte (MO) and lymphocyte (LY) fractions. Our analysis revealed that purified human MO did not respond to exogenous TNF-alpha with the induction of IL-8 mRNA or protein, nor require endogenous TNF-alpha for IL-8 expression. In contrast, in the presence of exogenous IL-1alpha and IL-1beta a substantial enhancement of IL-8 mRNA and protein expression in MO was observed. Nevertheless, antibodies to IL-1alpha and IL-1beta were unable to downregulate the expression of IL-8 in resting adherent or Staphylococcus aureus Cowan 1 (SAC)-stimulated MO. In contrast with MO, purified LY and non-fractionated PBMC expressed IL-8 in response to exogenous TNF-alpha, similar to exogenous IL-1alpha and IL-1beta. As was seen with MO, antibodies to TNF-alpha, IL-1alpha and IL-1beta did not inhibit the expression of IL-8 in purified LY and non-fractionated PBMC stimulated with SAC and LPS. Taken together, our data demonstrate major differences in responsiveness of MO and LY to exogenous TNF-alpha and IL-1, and suggest relative autonomy of IL-8 gene expression in these cells that does not require accessory cytokines but can be induced directly by exogenous stimuli. Copyright 2000 Academic Press.
机译:据报道,TNF-α和IL-1是包括白细胞在内的多种细胞中最强大的IL-8诱导剂。在这项研究中,我们调查了TNF-α和IL-1介导的非分级PBMC中IL-8基因表达的调节,以及纯化的单核细胞(MO)和淋巴细胞(LY)组分。我们的分析表明,纯化的人MO对IL-8 mRNA或蛋白质的诱导不响应外源性TNF-α,也不需要内源性TNF-α来表达IL-8。相反,在存在外源IL-1α和IL-1β的情况下,观察到MO中IL-8 mRNA和蛋白质表达的显着增强。尽管如此,针对IL-1alpha和IL-1beta的抗体无法下调静息粘附或金黄色葡萄球菌Cowan 1(SAC)刺激的MO中IL-8的表达。与MO相反,纯化的LY和未分级的PBMC响应于外源性TNF-α表达IL-8,类似于外源性IL-1alpha和IL-1beta。如MO所见,针对TNF-α,IL-1α和IL-1β的抗体在由SAC和LPS刺激的纯化的LY和未分级的PBMC中不抑制IL-8的表达。两者合计,我们的数据表明MO和LY对外源性TNF-alpha和IL-1的反应性存在主要差异,并暗示这些细胞中IL-8基因表达的相对自治性不需要辅助细胞因子,但可以由外源性直接诱导刺激。版权所有2000学术出版社。

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