セリアック病におけるトランスグルタミンゼ2媒介のグルテン抗原の表示に責任を持つデンドリート細胞群
Fu-Chen Yang1, Harrison A Besser1, Hye Rin Chun2
1Department of Chemistry, Stanford University, Stanford, United States of America.
JCI insight
|August 28, 2025
まとめ
デンドリット細胞 (DCs) はトランスグルタミナーゼ2 (TG2) とLRP1を使用して,グルテン抗原をセリアック疾患 (CeD) で処理する. この経路はヒト単細胞で活性化され,CeD患者で上昇し,グルテン毒性の細胞基盤を明らかにします.
科学分野:
- 免疫学
- 胃腸内科
- 細胞生物学
背景:
- セリアック病 (Celiac disease, CeD) は,グルテンによる自己免疫疾患である.
- トランスグルタミンゼ2 (TG2) とHLA- DQ2は,CeDの病原性において重要な役割を果たします.
- CeDにおけるTG2およびDQ2活性に責任のある特定の細胞は不明である.
研究 の 目的:
- 病原性TG2とDQ2の細胞源を特定する.
- CeDにおけるグルテン抗原の処理とプレゼンテーションのメカニズムを解明する.
- ヒト単細胞におけるTG2/LRP1経路の役割とそのCeDとの関連性を調査する.
主な方法:
- TG2とLRP1の相互作用を研究するために化学生物学ツールを使用した.
- 抗原表現を追跡するためにDQ2型トランスジェニックマウスモデルを使用した.
- 流動細胞測定と分子マーカーを用いて,CeD患者のヒト単細胞群を分析した.
主要な成果:
- 腸内CD103+ dendritic cells (DCs) は,細胞表面TG2とLRP1を使用して,リン酸体内のグルテン抗原をデアミダートし,濃縮する.
- これらの抗原に負荷されたDCはリンパ節に移動し,T細胞に抗原を提示し,腸内TG2活動を上調する.
- TG2/ LRP1経路はヒトのCD14+単細胞で活性化され,活性化CED患者では腸内DCサブセットが上昇している.
結論:
- CD103+のDCは,CEDにおけるグルテン抗原の処理と表示に不可欠である.
- 単細胞のTG2/LRP1経路は,CeDの潜在的なバイオマーカーと治療標的を提供します.
- 発見は,乳がんにおけるグルテン毒性の基礎となる細胞メカニズムを明らかにします.
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
Antigens Involved in Adaptive Immunity
667
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...
Complete Antigens
Complete antigens possess both immunogenicity and...
667
Antigen Presenting Cells
2.1K
The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...
T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...
2.1K
Antigen Processing Pathways
1.3K
MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...
MHC Class I: Presenting Endogenous...
1.3K
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
Cell-mediated Immune Responses
72.2K
Overview
72.2K


