IL-4 and IL-13 employ discrete signaling pathways for target gene expression in alternatively activated monocytes/macrophages.

IL-4 and IL-13 employ discrete signaling pathways for target gene expression in alternatively activated monocytes/macrophages.
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DOI:
10.1016/j.freeradbiomed.2012.10.553
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发表时间:
2013-01
影响因子:
7.4
通讯作者:
Cathcart, Martha K.
Cathcart, Martha K.
中科院分区:
医学1区
文献类型:
--
作者:
Bhattacharjee, Ashish;Shukla, Meenakshi;Yakubenko, Valentin P.;Mulya, Anny;Kundu, Suman;Cathcart, Martha K.

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单核细胞/巨噬细胞是先天免疫细胞,在炎症消退中发挥着至关重要的作用。在 Th2 细胞因子白细胞介素 4 (IL-4) 和白细胞介素 13 (IL-13) 存在的情况下,它们表现出抗炎特性,这种激活途径称为替代激活。在这项研究中,我们比较并区分了人类单核细胞/巨噬细胞的 IL-4 和 IL-13 激活介导的途径。在此,我们报告了单核细胞/巨噬细胞中 IL-4 和 IL-13 信号传导的差异调节,从 IL-4/IL-13 细胞因子受体开始,到 Jak-Stat 介导的信号传导途径,最终控制多个炎症基因的表达。我们的数据表明,虽然受体相关酪氨酸激酶 Jak2 和 Tyk2 在 IL-13 招募到其受体(包含 IL-4Rα 和 IL-13Rα1)后被激活,但 IL-4 刺激 Jak1 激活。我们进一步表明,Jak2 是 Stat3 激活的上游,而 Tyk2 响应 IL-13 刺激而控制 Stat1 和 Stat6 的激活。相反,Jak1 调节 IL-4 诱导的单核细胞中 Stat3 和 Stat6 的激活。我们的结果进一步表明,虽然IL-13同时利用IL-4Rα-Jak2-Stat3和IL-13Rα1-Tyk2-Stat1/Stat6信号通路,但IL-4只能利用IL-4Rα-Jak1-Stat3/Stat6级联来调节一些关键炎症基因的表达,包括15-脂氧合酶(15-LO)、单胺氧化酶A(MAO-A)和清道夫受体CD36。此外,我们在此证明,IL-13 和 IL-4 可以独特地影响特定基因的表达,如双特异性磷酸酶 1 (DUSP1) 和金属蛋白酶组织抑制剂 3 (TIMP3),并通过不同的 Jak 激酶来实现。作为 IL-4 和 IL-13 对基因功能差异调节的证据,我们进一步报道 MAO-A 介导的活性氧 (ROS) 生成受到不同 Jak 激酶的影响。总的来说,这些结果对于理解 IL-4 和 IL-13 交替激活单核细胞/巨噬细胞的机制和功能具有重要意义,并为不同炎症性疾病的发病机制和潜在治疗提供了新的见解。
Monocytes/macrophages are innate immune cells that play a crucial role in the resolution of inflammation. In presence of Th2 cytokines interleukin-4 (IL-4) and interleukin-13 (IL-13), they display an anti-inflammatory profile and this activation pathway is known as alternative activation. In this study we compare and differentiate pathways mediated by IL-4 and IL-13 activation of human monocytes/macrophage. Here we report differential regulation of IL-4 and IL-13 signaling in monocytes/macrophages starting from IL-4/IL-13 cytokine receptors to Jak-Stat-mediated signaling pathways that ultimately control expression of several infl1ammatory genes. Our data demonstrate that while the receptor-associated tyrosine kinases Jak2 and Tyk2 are activated after the recruitment of IL-13 to its receptor (containing IL-4Rα and IL-13Rα1), IL-4 stimulates Jak1 activation. We further show that Jak2 is upstream of Stat3 activation and Tyk2 controls Stat1 and Stat6 activation in response to IL-13 stimulation. In contrast, Jak1 regulates Stat3 and Stat6 activation in IL-4-induced monocytes. Our results further reveal that while IL-13 utilizes both IL-4Rα-Jak2-Stat3 and IL-13Rα1-Tyk2-Stat1/Stat6 signaling pathways, IL-4 can only use the IL-4Rα-Jak1-Stat3/Stat6 cascade to regulate the expression of some critical inflammatory genes including 15-lipoxygenase (15-LO), monoamine oxidase A (MAO-A) and scavenger receptor CD36. Moreover, we demonstrate here that IL-13 and IL-4 can uniquely affect the expression of particular genes like dual specificity phosphatase 1 (DUSP1) and tissue inhibitor of metalloprotease-3 (TIMP3) and do so through different Jak kinaes. As evidence of differential regulation of gene function by IL-4 and IL-13, we further report that MAO-A-mediated reactive oxygen species (ROS) generation is influenced by different Jak kinases. Collectively, these results have major implications for understanding the mechanism and function of alternatively activated monocytes/macrophages by IL-4 and IL-13 and add novel insights into the pathogenesis and potential treatment of different inflammatory diseases.
单胺氧化酶(MAO)在心力衰竭和缺血/再灌注损伤发病机制中的作用。
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影响因子: --
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期刊: Journal of immunology (Baltimore, Md. : 1950)
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发表时间: 1997-02-01
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