変化したT細胞受容体リガンドによるT細胞アナーギーの誘導は,生きた抗原を呈現する細胞に作用する
J Sloan-Lancaster1, B D Evavold, P M Allen
1Department of Pathology, Washington University School of Medicine, St Louis, Missouri 63110.
Nature
|May 13, 1993
まとめ
T細胞受容体 (TCR) リガンドをペプチドアナログで改変すると,T細胞アナージーが誘発される. この部分的活性化は,増殖なしでは,Th1細胞の深い無反応につながり,免疫反応に影響を与えます.
科学分野:
- 免疫学 免疫学とは
- 細胞生物学 細胞生物学
背景:
- T細胞の活性化には,T細胞受容体 (TCR) の関与と共刺激が必要です.
- 共同刺激の欠如は,T細胞の反応不全につながる可能性があります.
- 部分的活性化は,増殖なしにエフェクター機能を誘導することができます.
研究 の 目的:
- ペプチドアナログを用いた部分的なT細胞活性化の影響を調査する.
- 部分活性化がTh1クローンでアナーギーを誘発できるかどうかを判断する.
主な方法:
- TCRエンゲージメントを通じてTh1クローンを部分的に活性化するためにペプチドアナログを使用した.
- 活体抗原呈現細胞 (APC) を用いたペプチドアナログを提示した.
- 評価されたT細胞の増殖,サイトカインの産生,およびその後の刺激に対する反応の欠如.
主要な成果:
- ペプチドアナログは,Th1クローンの深い無反応を引き起こした.
- このアナログは,クローン増殖,サイトカイン生成,イノシトールリン酸塩生成を刺激しませんでした.
- TCRリガンド変異による部分活性化により,T細胞アナージーが発生した.
結論:
- APCのペプチド類似体によるTCRリガンドの変異は,Th1細胞におけるアナーギーを誘発する.
- 増殖なしでも,部分的活性化は,持続的なT細胞反応不全につながる可能性があります.
- この発見は,免疫調節と耐性を理解するための意味を持つ.
関連する概念動画
01:26Antigens Involved in Adaptive Immunity
An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
01:28Diversity of Antigen Receptors
Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
01:22T Cell Activation and Clonal Selection
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...
01:24T Cell Types and Functions
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...
01:27Cytotoxic 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...
01:24B Cell Activation and Differentiation
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...