CD6互动组编排了连接体独立的T细胞抑制信号传递
Rita F Santos1,2,3, Annika de Sousa Linhares4, Peter Steinberger4
1IBMC - Instituto de Biologia Molecular e Celular, Porto, Porto, Portugal.
Cell communication and signaling : CCS
|May 24, 2024
概括
CD6蛋白作为一种新型的支架受体,通过增强抑制和连接体结合来调节T细胞的反应. 这种双重功能使CD6能够建立信号值并调节T细胞活动.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 分子信号传输的方法
背景情况:
- T细胞膜支架蛋白对于T细胞信号传递至关重要.
- CD6是一种支架蛋白,通过其ectodomain将CD166与抗原呈现细胞 (APC) 相结合.
- CD6的信号性质 (共刺激性或抑制性) 和其ectodomain的作用仍然不清楚.
研究的目的:
- 为了研究CD6细胞外细胞和细胞质区域的信号功能.
- 为了确定CD6-CD166相互作用对T细胞激活和粘附的影响.
- 阐明CD6在T细胞反应中的作用及其转移到免疫突触中的作用.
主要方法:
- 在具有NF-κB和NF-AT记者的Jurkat细胞中表达具有删除/突变的CD6变异.
- 在Jurkat-APC共同培养后通过eGFP流细胞计评估T细胞激活.
- 使用成像流细胞计分析CD6-CD166对细胞粘附和CD6转移到免疫突触的影响.
主要成果:
- CD6转移到免疫突触,并施加了依赖于其细胞突变尾巴的强力抑制.
- 突触转位独立于细胞外d3域和CD166参与.
- CD6-CD166结合增强了T细胞:APC粘附,特别是在没有APC原始化或T细胞受体参与的情况下.
结论:
- CD6作为一种新的"开/关"支架受体,调节T细胞的响应.
- 它通过连接体独立的强力抑制作为膜结合的支架来建立信号值.
- CD6表现出替代拼接依赖的连接体参与,影响其类似检查点的活动.
相关概念视频
T Cell Activation and Clonal Selection
706
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...
706
TGF - β Signaling Pathway
7.3K
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors...
7.3K
Assembly of Signaling Complexes
5.7K
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
5.7K
Interactions Between Signaling Pathways
6.3K
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
6.3K
T Cell Types and Functions
1.0K
When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
1.0K
Amplifying Signals via Enzymatic Cascade
8.5K
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
8.5K


