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氧合磷脂酰乙醇胺通过与 TLR2 相互作用来引导铁死亡细胞的吞噬作用。

Oxygenated phosphatidylethanolamine navigates phagocytosis of ferroptotic cells by interacting with TLR2.

机构信息

Guangdong Engineering Research Center of Chinese Medicine & Disease Susceptibility, Jinan University, Guangzhou, 510632, China.

International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education (MOE), College of Pharmacy, Jinan University, Guangzhou, 510632, China.

出版信息

Cell Death Differ. 2021 Jun;28(6):1971-1989. doi: 10.1038/s41418-020-00719-2. Epub 2021 Jan 11.

Abstract

During cancer therapy, phagocytic clearance of dead cells plays a vital role in immune homeostasis. The nonapoptotic form of cell death, ferroptosis, exhibits extraordinary potential in tumor treatment. However, the phagocytosis mechanism that regulates the engulfment of ferroptotic cells remains unclear. Here, we establish a novel pathway for phagocytic clearance of ferroptotic cells that is different from canonical mechanisms by using diverse ferroptosis models evoked by GPX4 dysfunction/deficiency. We identified the oxidized phospholipid, 1-steaoryl-2-15-HpETE-sn-glycero-3-phosphatidylethanolamine (SAPE-OOH), as a key eat-me signal on the ferroptotic cell surface. Enriching the plasma membrane with SAPE-OOH increased the efficiency of phagocytosis of ferroptotic cells by macrophage, a process that was suppressed by lipoprotein-associated phospholipase A. Ligand fishing, lipid blotting, and cellular thermal shift assay screened and identified TLR2 as a membrane receptor that directly recognized SAPE-OOH, which was further confirmed by TLR2 inhibitors and gene silencing studies. A mouse mammary tumor model of ferroptosis verified SAPE-OOH and TLR2 as critical players in the clearance of ferroptotic cells in vivo. Taken together, this work demonstrates that SAPE-OOH on ferroptotic cell surface acts as an eat-me signal and navigates phagocytosis by targeting TLR2 on macrophages.

摘要

在癌症治疗过程中,吞噬细胞清除死亡细胞对于免疫稳态起着至关重要的作用。非细胞凋亡形式的细胞死亡——铁死亡,在肿瘤治疗中显示出了非凡的潜力。然而,调节铁死亡细胞吞噬作用的吞噬机制尚不清楚。在这里,我们使用不同的由 GPX4 功能障碍/缺失引发的铁死亡模型,建立了一条不同于经典机制的铁死亡细胞吞噬清除的新途径。我们发现了氧化磷脂 1-硬脂酰基-2-15-HpETE- sn-甘油-3-磷酸乙醇胺(SAPE-OOH),是铁死亡细胞表面的关键“吃我”信号。在质膜中富集 SAPE-OOH 会增加巨噬细胞吞噬铁死亡细胞的效率,脂蛋白相关磷脂酶 A 会抑制这一过程。配体捕捞、脂质印迹和细胞热转移分析筛选并鉴定 TLR2 是一种直接识别 SAPE-OOH 的膜受体,TLR2 抑制剂和基因沉默研究进一步证实了这一点。铁死亡的小鼠乳腺肿瘤模型验证了 SAPE-OOH 和 TLR2 是体内清除铁死亡细胞的关键因子。总之,这项工作表明,铁死亡细胞表面的 SAPE-OOH 作为一种“吃我”信号,通过靶向巨噬细胞上的 TLR2 来引导吞噬作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b7e0/8185102/cef700f9edd2/41418_2020_719_Fig1_HTML.jpg

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