The Center for Cell Clearance, University of Virginia, Charlottesville, VA, USA; Department of Microbiology, Immunology, and Cancer Biology, University of Virginia, Charlottesville, VA, USA; Department of Medicine, Division of Nephrology and Center for Immunity, Inflammation and Regenerative Medicine (CIIR), University of Virginia, Charlottesville, VA, USA; Preemptive Food Research Center (PFRC), Gifu University Institute for Advanced Study, Gifu, Japan.
Department of Medicine, Division of Nephrology and Center for Immunity, Inflammation and Regenerative Medicine (CIIR), University of Virginia, Charlottesville, VA, USA.
Cell. 2022 Dec 22;185(26):4887-4903.e17. doi: 10.1016/j.cell.2022.11.029.
Our bodies turn over billions of cells daily via apoptosis and are in turn cleared by phagocytes via the process of "efferocytosis." Defects in efferocytosis are now linked to various inflammatory diseases. Here, we designed a strategy to boost efferocytosis, denoted "chimeric receptor for efferocytosis" (CHEF). We fused a specific signaling domain within the cytoplasmic adapter protein ELMO1 to the extracellular phosphatidylserine recognition domains of the efferocytic receptors BAI1 or TIM4, generating BELMO and TELMO, respectively. CHEF-expressing phagocytes display a striking increase in efferocytosis. In mouse models of inflammation, BELMO expression attenuates colitis, hepatotoxicity, and nephrotoxicity. In mechanistic studies, BELMO increases ER-resident enzymes and chaperones to overcome protein-folding-associated toxicity, which was further validated in a model of ER-stress-induced renal ischemia-reperfusion injury. Finally, TELMO introduction after onset of kidney injury significantly reduced fibrosis. Collectively, these data advance a concept of chimeric efferocytic receptors to boost efferocytosis and dampen inflammation.
我们的身体每天通过细胞凋亡更新数十亿个细胞,而这些细胞又被吞噬细胞通过“吞噬作用”清除。吞噬作用的缺陷现在与各种炎症性疾病有关。在这里,我们设计了一种增强吞噬作用的策略,称为“吞噬作用嵌合受体”(CHEF)。我们将细胞质衔接蛋白 ELMO1 中的特定信号结构域融合到吞噬作用受体 BAI1 或 TIM4 的胞外磷脂酰丝氨酸识别结构域中,分别生成 BELMO 和 TELMO。表达 CHEF 的吞噬细胞的吞噬作用明显增加。在炎症的小鼠模型中,BELMO 的表达可减轻结肠炎、肝毒性和肾毒性。在机制研究中,BELMO 增加内质网驻留酶和伴侣蛋白以克服与蛋白质折叠相关的毒性,这在内质网应激诱导的肾缺血再灌注损伤模型中得到了进一步验证。最后,在肾损伤发生后引入 TELMO 可显著减少纤维化。总之,这些数据提出了一种嵌合吞噬受体的概念,以增强吞噬作用并抑制炎症。
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