関連する実験動画
Updated: Sep 9, 2025

10:29
Generation of Human Chimeric Antigen Receptor Regulatory T Cells
Published on: January 3, 2025
1.6K
レチノ酸受容体に関連する孤児受容体αは,記憶CD8+T細胞の傍観者活性化を調節する
Zimeng Cai1, Mina Kozai2, Hironobu Mita1
1Laboratory of Molecular Medicine, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan.
Frontiers in immunology
|September 2, 2025
まとめ
レチノ酸受容体に関連する孤児受容体アルファ (RORα) は,記憶CD8+T細胞におけるインターフェロン-ガンマ (IFN-γ) 産生を駆動し,傍観者活性化を通じて早期宿主防御を強化する. これは感染症やワクチン接種後の 免疫の改善の鍵となるメカニズムを示しています
科学分野:
- 免疫学
- 分子生物学
- 細胞生物学
背景:
- メモリーCD8+T細胞は,先天的な傍観者活性化を示し,早期の宿主防御のための同類抗原とは独立して,インターフェロン-ガンマ (IFN-γ) を迅速に生成する.
- この傍観者活性化を制御する 分子機構は ほとんど未知のままです
- レチノ酸受容体に関連した孤児受容体アルファ (RORα) は,記憶CD8+T細胞で高度に発現する核受容体であり,未調査の機能的役割を持っています.
研究 の 目的:
- メモリ CD8+ T細胞の傍観者活性化に伴う分子メカニズムを解明する.
- レチノ酸受容体関連孤児受容体アルファ (RORα) の記憶CD8+T細胞活性化および機能における機能的役割を調査する.
主な方法:
- 主要および二次記憶T細胞を誘導するリステリア・モノサイトゲネス感染に続く受容体マウスへのネイブOT-IT細胞の養子移植.
- 定量PCRとRNA配列解析により,RORα発現を検査し,記憶T細胞における標的遺伝子を特定する.
- 炎症性サイトカイン (IL-12 + TL1A) とリポポリサカリド (LPS) のインビオ注射によるインビトロ刺激により,RORα欠乏が傍観者活性化に与える影響を評価する.
主要な成果:
- RORα発現は二次記憶CD8+T細胞で著しく上調され,エフェクタのような記憶T細胞の濃縮と相関する.
- RORαはTL1A受容体の発現を調節する転写因子として機能する.
- RORα欠乏症は,IL-12 + TL1Aへの反応としてIFN-γの生成を無効化し,LPS誘発の炎症に対する傍観者の反応を減少させます.
結論:
- この研究は,RORαによる記憶CD8+T細胞の傍観者活性化のための新しい調節メカニズムを特定した.
- この発見は,記憶T細胞が,繰り返し感染やワクチン接種を受けた後に,どのように即時の保護能力を強化するかについての理解を深めるものです.
- RORαは,記憶CD8+T細胞における先天的な免疫反応の重要な媒介である.
関連する概念動画
T Cell Activation and Clonal Selection
4.5K
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...
4.5K
Receptor Downregulation in MVBs
2.1K
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...
2.1K
Cells of the Adaptive Immune Response
4.0K
The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
4.0K
T Cell Types and Functions
1.4K
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...
1.4K
Cytotoxic T Cells-mediated Immune Response
1.9K
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...
1.9K
B Cell Activation and Differentiation
5.5K
The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
5.5K

