Gpx4 通过防止脂质过氧化和铁死来调节不变NKT细胞的恒常性和功能
Sophia P M Sok1, Kaitlyn Pipkin1, Narcis I Popescu1
1Arthritis and Clinical Immunology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK.
Journal of immunology (Baltimore, Md. : 1950)
|August 19, 2024
概括
不变的自然杀手T (iNKT) 细胞依赖谷氨过氧化酶4 (Gpx4) 防止脂质过氧化和铁亡. 缺乏Gpx4会损害iNKT细胞的功能和生存,突出显示了它在免疫平衡中的关键作用.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 不变的自然杀手T (iNKT) 细胞对于免疫恒温和激活至关重要.
- 这些与生俱来的T细胞表现出比CD4+T细胞更高的脂质过氧化水平.
- 脂氧化酶氨酸过氧化酶4 (Gpx4) 是一种关键的抗氧化酶.
研究的目的:
- 研究Gpx4在iNKT细胞恒温和功能中的作用.
- 确定Gpx4缺乏对iNKT细胞脂质过氧化和铁的影响.
- 探索与Gpx4相关的iNKT细胞功能障碍的治疗干预措施.
主要方法:
- 在iNKT和CD4+T细胞中对脂质过氧化的比较分析.
- 蛋白质组分析以量化Gpx4表达.
- 在小鼠中,T细胞特异性的Gpx4缺失.
- 用RNA测序来评估iNKT细胞中的基因表达变化.
- 用铁灭抑制剂,铁化剂,维生素E和维生素K2治疗.
主要成果:
- 与CD4+ T细胞相比,iNKT细胞表达的Gpx4水平更高.
- 特定于T细胞的Gpx4删除显著减少了iNKT细胞种群,特别是NKT1子集.
- 删除Gpx4干扰了iNKT细胞中的IFN-γ信号传递,细胞周期调节和线粒体功能.
- Gpx4淘汰赛iNKT细胞显示细胞因子产生受损,细胞死亡升高,脂质过氧化和线粒体反应性氧物种增加.
- 铁酶抑制剂和抗氧化剂改善了Gpx4缺乏引起的iNKT细胞功能障碍.
- 维生素E在Gpx4淘汰赛小鼠中挽救了iNKT细胞群.
结论:
- Gpx4对于维持iNKT细胞平衡和功能至关重要.
- Gpx4通过控制脂质过氧化和防止铁亡来调节iNKT细胞命运.
- 向Gpx4或铁亡途径可能为iNKT细胞相关的免疫疾病提供治疗策略.
相关概念视频
Protein Import into the Peroxisomes
3.4K
Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
3.4K
Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal
2.2K
Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.
2.2K
Peroxisomes
11.5K
Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
11.5K
Necrosis
4.4K
Necrosis is considered as an “accidental” or unexpected form of cell death that ends in cell lysis. The first noticeable mention of “necrosis” was in 1859 when Rudolf Virchow used this term to describe advanced tissue breakdown in his compilation titled “Cell Pathology”.
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become...
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become...
4.4K
Role Of Notch Signalling In Intestinal Stem Cell Renewal
2.1K
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
2.1K
Regulation of Nuclear Protein Sorting
2.4K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
2.4K


