鉴定了一种树突细胞受体,该受体将感知亡与免疫结合在一起
David Sancho1, Olivier P Joffre, Anna M Keller
1Immunobiology Laboratory, London Research Institute, Lincoln's Inn Fields Laboratories, 44 Lincoln's Inn Fields, London WC2A 3PX, UK.
Nature
|February 17, 2009
概括
死细胞会触发免疫反应. CD8alpha+树突细胞使用CLEC9A来感知这些细胞,启动T细胞原始化. 这一发现对于理解移植中的免疫力和癌症排斥至关重要.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 死亡细胞的清除受损导致炎症和组织修复.
- 死细胞抗原可以引起特定的免疫反应,这可能解释了在非传染性情况下的适应性免疫力,例如移植排斥和瘤排斥.
研究的目的:
- 研究CLEC9A在树突细胞识别死细胞中的作用.
- 阐明CLEC9A通过哪些分子机制来调解对死细胞的免疫反应.
主要方法:
- 在小鼠模型中利用了CLEC9A的淘汰和阻断策略.
- 评估了CD8+树突细胞对死细胞物质的吸收.
- 测量了抗原交叉呈现 in vitro 和 in vivo 死细胞的免疫性.
- 研究了氨酸激酶SYK在CLEC9A功能中的作用.
主要成果:
- CD8alpha+树突细胞利用CLEC9A来识别死细胞.
- 失去或阻断CLEC9A会减少死细胞抗原的交叉呈现和死细胞免疫性.
- 对于SYK的招募和激活,CLEC9A功能需要一种特定的氨酸残留物,这对于交叉呈现至关重要.
- CLEC9A作为一种SYK合的C型莱克受体,用于感知缩.
结论:
- CLEC9A是CD8alpha+树突细胞感知死细胞的关键受体.
- 通过SYK的CLEC9A信号传递对于死细胞抗原的交叉呈现至关重要.
- 这一途径是启动适应性免疫反应对死细胞相关抗原的关键.
相关概念视频
Cells of the Innate Immune Response
The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
Necrosis
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 anucleated and die, but their...
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 anucleated and die, but their...
Immune Surveillance by NK Cells and Phagocytes
Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
Natural Killer Cells: The Fast Responders
NK cells are large granular lymphocytes found in the blood and lymphatic system. These...
Natural Killer Cells: The Fast Responders
NK cells are large granular lymphocytes found in the blood and lymphatic system. These...
The Extrinsic Apoptotic Pathway
The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
Cytotoxic T Cells-mediated Immune Response
Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
Phagocytosis of Apoptotic Cells
Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or immature dendritic cells. Non-professional phagocytes such as epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes.
Normal cells contain receptors that prevent them from being recognized by phagocytes.
Normal cells contain receptors that prevent them from being recognized by phagocytes.

