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对巨噬细胞中α-1-抗胰蛋白酶(AAT)调节的、糖皮质激素受体依赖性基因的分析揭示了AAT一种新的宿主防御功能。

Analysis of alpha-1-antitrypsin (AAT)-regulated, glucocorticoid receptor-dependent genes in macrophages reveals a novel host defense function of AAT.

作者信息

Bai Xiyuan, Gao Junfeng, Guan Xiaoyu, Narum Drew E, Fornis Lorelenn B, Griffith David E, Gao Bifeng, Sandhaus Robert A, Huang Hua, Chan Edward D

机构信息

Department of Medicine, Rocky Mountain Regional Veterans Affairs Medical Center, Aurora, Colorado, USA.

Department of Academic Affairs, National Jewish Health, Denver, Colorado, USA.

出版信息

Physiol Rep. 2024 Jul;12(14):e16124. doi: 10.14814/phy2.16124.

Abstract

Alpha-1-antitrypsin (AAT) plays a homeostatic role in attenuating excessive inflammation and augmenting host defense against microbes. We demonstrated previously that AAT binds to the glucocorticoid receptor (GR) resulting in significant anti-inflammatory and antimycobacterial consequences in macrophages. Our current investigation aims to uncover AAT-regulated genes that rely on GR in macrophages. We incubated control THP-1 cells (THP-1) and THP-1 cells knocked down for GR (THP-1) with AAT, performed bulk RNA sequencing, and analyzed the findings. In THP-1 cells, AAT significantly upregulated 408 genes and downregulated 376 genes. Comparing THP-1 and THP-1 cells, 125 (30.6%) of the AAT-upregulated genes and 154 (41.0%) of the AAT-downregulated genes were significantly dependent on GR. Among the AAT-upregulated, GR-dependent genes, CSF-2 that encodes for granulocyte-monocyte colony-stimulating factor (GM-CSF), known to be host-protective against nontuberculous mycobacteria, was strongly upregulated by AAT and dependent on GR. We further quantified the mRNA and protein of several AAT-upregulated, GR-dependent genes in macrophages and the mRNA of several AAT-downregulated, GR-dependent genes. We also discussed the function(s) of selected AAT-regulated, GR-dependent gene products largely in the context of mycobacterial infections. In conclusion, AAT regulated several genes that are dependent on GR and play roles in host immunity against mycobacteria.

摘要

α1抗胰蛋白酶(AAT)在减轻过度炎症反应和增强宿主对微生物的防御方面发挥着稳态作用。我们之前证明,AAT与糖皮质激素受体(GR)结合,在巨噬细胞中产生显著的抗炎和抗分枝杆菌作用。我们目前的研究旨在揭示巨噬细胞中依赖GR的AAT调控基因。我们用AAT孵育对照THP-1细胞(THP-1)和敲低GR的THP-1细胞(THP-1),进行批量RNA测序并分析结果。在THP-1细胞中,AAT显著上调了408个基因,下调了376个基因。比较THP-1和THP-1细胞,AAT上调基因中的125个(30.6%)和AAT下调基因中的154个(41.0%)显著依赖GR。在AAT上调的、依赖GR的基因中,编码粒细胞-单核细胞集落刺激因子(GM-CSF)的CSF-2被AAT强烈上调且依赖GR,GM-CSF已知对非结核分枝杆菌具有宿主保护作用。我们进一步定量了巨噬细胞中一些AAT上调的、依赖GR的基因的mRNA和蛋白质,以及一些AAT下调的、依赖GR的基因的mRNA。我们还主要在分枝杆菌感染的背景下讨论了所选AAT调控的、依赖GR的基因产物的功能。总之,AAT调控了几个依赖GR且在宿主抗分枝杆菌免疫中发挥作用的基因。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a46b/11252833/5ba4de82698f/PHY2-12-e16124-g010.jpg

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