稳定缺氧诱导因子可增强人巨噬细胞对 的抗菌活性。

Stabilization of Hypoxia-Inducible Factor Promotes Antimicrobial Activity of Human Macrophages Against .

机构信息

Institute of Medical Microbiology and Infection Control, University Hospital Ulm, Ulm, Germany.

出版信息

Front Immunol. 2021 Jun 2;12:678354. doi: 10.3389/fimmu.2021.678354. eCollection 2021.

Abstract

Hypoxia-inducible factor (HIF) is a key oxygen sensor that controls gene expression patterns to adapt cellular metabolism to hypoxia. Pharmacological inhibition of prolyl-hydroxylases stabilizes HIFs and mimics hypoxia, leading to increased expression of more than 300 genes. Whether the genetic program initialized by HIFs affects immune responses against microbial pathogens, is not well studied. Recently we showed that hypoxia enhances antimicrobial activity against () in human macrophages. The objective of this study was to evaluate whether the oxygen sensor HIF is involved in hypoxia-mediated antimycobacterial activity. Treatment of -infected macrophages with the prolyl-hydroxylase inhibitor Molidustat reduced the release of TNFα and IL-10, two key cytokines involved in the immune response in tuberculosis. Molidustat also interferes with the p38 MAP kinase pathway. HIF-stabilization by Molidustat also induced the upregulation of the Vitamin D receptor and human β defensin 2, which define an antimicrobial effector pathway in human macrophages. Consequently, these immunological effects resulted in reduced proliferation of virulent in human macrophages. Therefore, HIFs may be attractive new candidates for host-directed therapies against infectious diseases caused by intracellular bacteria, including tuberculosis.

摘要

缺氧诱导因子 (HIF) 是一种关键的氧传感器,它控制基因表达模式,使细胞代谢适应缺氧。脯氨酰羟化酶的药理学抑制稳定了 HIF,并模拟了缺氧,导致超过 300 个基因的表达增加。HIF 初始化的遗传程序是否会影响对微生物病原体的免疫反应,尚未得到很好的研究。最近我们表明,缺氧增强了人类巨噬细胞中对 ()的抗菌活性。本研究的目的是评估氧传感器 HIF 是否参与缺氧介导的抗分枝杆菌活性。用脯氨酰羟化酶抑制剂 Molidustat 处理感染的巨噬细胞,减少了 TNFα 和 IL-10 的释放,这两种细胞因子在结核病的免疫反应中起关键作用。Molidustat 还干扰了 p38 MAP 激酶途径。Molidustat 稳定 HIF 也诱导了维生素 D 受体和人 β 防御素 2 的上调,这定义了人类巨噬细胞中的一种抗菌效应途径。因此,这些免疫作用导致人类巨噬细胞中毒力的增殖减少。因此,HIF 可能是针对包括结核病在内的由细胞内细菌引起的传染病的宿主定向治疗的有吸引力的新候选物。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b36/8206807/d6429d6c2169/fimmu-12-678354-g001.jpg

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