E3 连接酶 VHL 通过代谢-表观遗传调控控制肺泡巨噬细胞功能。
The E3 ligase VHL controls alveolar macrophage function via metabolic-epigenetic regulation.
机构信息
Institute for Immunology, Peking-Tsinghua Center for Life Sciences, School of Medicine, Tsinghua University, Beijing, China.
La Jolla Institute for Allergy and Immunology, La Jolla, CA.
出版信息
J Exp Med. 2018 Dec 3;215(12):3180-3193. doi: 10.1084/jem.20181211. Epub 2018 Nov 21.
Metabolic pathways such as glycolysis or oxidative phosphorylation play a key role in regulating macrophage function during inflammation and tissue repair. However, how exactly the VHL-HIF-glycolysis axis is involved in the function of tissue-resident macrophages remains unclear. Here we demonstrate that loss of VHL in myeloid cells resulted in attenuated pulmonary type 2 and fibrotic responses, accompanied by reduced eosinophil infiltration, decreased IL-5 and IL-13 concentrations, and ameliorated fiber deposition upon challenge. VHL deficiency uplifted glycolytic metabolism, decreased respiratory capacity, and reduced osteopontin expression in alveolar macrophages, which impaired the function of type 2 innate lymphoid cells but was significantly reversed by HIF1α inhibition or ablation. The up-regulated glycolysis altered the epigenetic modification of osteopontin gene, with the metabolic intermediate 3-phosphoglyceric acid as a key checkpoint controller. Thus, our results indicate that VHL acts as a crucial regulatory factor in lung inflammation and fibrosis by regulating alveolar macrophages.
代谢途径,如糖酵解或氧化磷酸化,在炎症和组织修复过程中调节巨噬细胞功能方面发挥着关键作用。然而,VHL-HIF-糖酵解轴如何参与组织驻留巨噬细胞的功能仍然不清楚。在这里,我们证明了髓细胞中 VHL 的缺失导致肺 2 型和纤维化反应减弱,伴随着嗜酸性粒细胞浸润减少、IL-5 和 IL-13 浓度降低以及在挑战时纤维沉积改善。VHL 缺乏会提高糖酵解代谢,降低肺泡巨噬细胞的呼吸能力,并减少骨桥蛋白的表达,从而损害 2 型先天淋巴细胞的功能,但通过 HIF1α 抑制或消融可显著逆转。上调的糖酵解改变了骨桥蛋白基因的表观遗传修饰,其中代谢中间产物 3-磷酸甘油酸作为关键的检查点控制器。因此,我们的结果表明,VHL 通过调节肺泡巨噬细胞在肺部炎症和纤维化中发挥重要的调节作用。