IL-15 links TLR2/1-induced macrophage differentiation to the vitamin D-dependent antimicrobial pathway.

IL-15 links TLR2/1-induced macrophage differentiation to the vitamin D-dependent antimicrobial pathway.
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DOI:
10.4049/jimmunol.181.10.7115
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发表时间:
2008-11-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Modlin RL
Modlin RL
中科院分区:
其他
文献类型:
--
作者:
Krutzik SR;Hewison M;Liu PT;Robles JA;Stenger S;Adams JS;Modlin RL

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先天免疫系统的一个基本功能是直接触发抗菌机制,以防御入侵的病原体。在人类中,一种这样的途径涉及TLR2/1L的激活,导致维生素D依赖的抗菌肽的诱导。在本研究中,我们发现TLR2/1诱导的IL-15是诱导细胞色素P27b1、VDR和下游抗菌肽长春花素所必需的。虽然IL-15和IL-4都能诱导巨噬细胞分化,但只有IL-15本身足以诱导细胞色素P27b1和随后的25-羟基维生素D3(25D3)的生物转化为生物活性的1,25D3,导致VDR激活和诱导放线菌素。最后,25D3可诱导IL-15分化的巨噬细胞产生抗结核分枝杆菌的活性。因此,IL-15将TLR2/1诱导的巨噬细胞分化与维生素D依赖的抗菌途径联系起来。
An essential function of the innate immune system is to directly trigger antimicrobial mechanisms to defend against invading pathogens. In humans, one such pathway involves activation by TLR2/1L leading to the vitamin D-dependent induction of antimicrobial peptides. In this study, we found that TLR2/1-induced IL-15 was required for induction of CYP27b1, the VDR and the downstream antimicrobial peptide cathelicidin. Although both IL-15 and IL-4 triggered macrophage differentiation, only IL-15 was sufficient by itself to induce CYP27b1 and subsequent bioconversion of 25-hydroxyvitamin D3 (25D3) into bioactive 1,25D3, leading to VDR activation and induction of cathelicidin. Finally, IL-15-differentiated macrophages could be triggered by 25D3 to induce an antimicrobial activity against intracellular Mycobacterium tuberculosis. Therefore, IL-15 links TLR2/1-induced macrophage differentiation to the vitamin D-dependent antimicrobial pathway.
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