无意义的CD247突变显示T细胞受体表达和功能的主导负特征
Alejandro C Briones1, Rebeca F Megino1, Ana V Marin1
1Department of Immunology, Ophthalmology and ENT, Complutense University School of Medicine and 12 de Octubre Health Research Institute (imas12), Madrid, Spain.
The Journal of allergy and clinical immunology
|July 11, 2024
概括
在CD247中发生异构的无意义突变,影响ITAM,损害T细胞受体 (TCR) 组合和信号传递. 这些变异可能对TCR表达产生主导负面影响,可能与免疫缺陷有关.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 不变的TCR ζ/CD247同极体对TCR/CD3表达和通过其3个ITAM传递信号至关重要.
- CD247突变可以导致免疫缺陷,但其他CD247变异对TCR功能的影响尚不清楚.
研究的目的:
- 分析和建模异合体无意义CD247突变对T细胞受体 (TCR) 表达和功能的影响.
- 在免疫缺陷或自身免疫的患者中调查潜在的主导负面影响.
主要方法:
- 尤尔卡特T细胞 (WT和CD247缺乏ZKO) 是使用CRISPR/Cas9.9进行的.
- 细胞被转化为WT CD247或具有突变ITAMs (Q142X,Q101X,Q70X) 的变体.
主要成果:
- 在患者中发现了两种异构无意义的CD247突变 (p.Y152X,p.Q101X),影响ITAM-2和/或ITAM-3.
- 突变的CD247变种降低了表面CD3表达和T细胞信号受损 (CD69诱导).
- 在ZKO细胞中缺乏ITAM的CD247变体的表达未能恢复正常的CD3水平;在WT细胞中,它减少了CD3表达.
结论:
- 由于无意义突变,缺少ITAM的CD247变体在TCR组装中存在缺陷.
- 这些变异在体外对TCR表达和信号产生主导负效应.
- 这种体外效应可能与患者观察到的临床症状有关.
相关概念视频
Receptor Downregulation in MVBs
2.0K
Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...
2.0K
T Cell Activation and Clonal Selection
697
T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
Naive T cells that have not yet encountered an antigen express two primary CD...
697
Cancer-Critical Genes II: Tumor Suppressor Genes
7.4K
Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
7.4K
Loss of Tumor Suppressor Gene Functions
4.8K
Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
4.8K
Abnormal Proliferation
4.5K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.5K


