リポソームに封じ込められた抗原は,リゾソームで処理され,リサイクルされ,T細胞に提示されます
C V Harding1, D S Collins, J W Slot
1Department of Pathology, Washington University School of Medicine, St. Louis, Missouri 63110.
Cell
|January 25, 1991
まとめ
抗原ペプチドは,T細胞へのプレゼンテーションのために初期のエンドソームではなく,リソソームで生成されます. このリゾソーム処理は,MHC-II分子を介して抗原のプレゼンテーションを強化します.
科学分野:
- 免疫学 免疫学とは
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
背景:
- アンチゲン処理は,T細胞の認識と免疫反応に不可欠です.
- クラスIIメジャー・ヒストコンパティビリティ・コンプレックス (MHC-II) 分子は,Tヘルパー細胞に細胞外または内体抗原から派生したペプチドを提示する.
- MHC-IIプレゼンテーションにおける抗原分解の正確な細胞内位置については議論されてきた.
研究 の 目的:
- MHC-II表示のために抗原処理が行われる特定の細胞内区画を決定する.
- MHC-IIロードのためのペプチドを生成するライソソームの役割を調査する.
主な方法:
- 鶏卵リゾジムは,放出場所を制御するために,酸に敏感または酸に耐性のあるリポソームにカプセル化されました.
- リポソームの含有物は,初期のエンドソーム (酸感受性) またはリソソーム (酸耐性) をターゲットとした.
- 抗原の処理とプレゼンテーションを評価し,リゾソームの処理の指標としてクロロキンの感受性を評価した.
主要な成果:
- 酸耐性リポソームを介してリソソームに届く抗原は,早期エンドソームに届く抗原よりも効率的に処理され,より効果的に提示されました.
- リソソーム標的抗原の処理はクロロクインに敏感であり,リソソームの関与を確認した.
- 酸に敏感なリポソームは,初期のエンドソームで抗原を放出し,処理とプレゼンテーションの効率が低下します.
結論:
- 密度の高いライソソームは,MHC-II分子に結合する免疫性ペプチドを生成する主要な場所です.
- ペプチドは,MHC-II負荷およびその後の細胞表面プレゼンテーションのために,リゾソームからエンドソームにリサイクルすることができます.
- リンソーム処理は,T細胞に最適な抗原プレゼンテーションをするために重要です.
関連する概念動画
Cell-mediated Immune Responses
64.7K
Overview
64.7K
Delivery Pathways to the Lysosome
7.6K
Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
7.6K
Cells of the Adaptive Immune Response
6.9K
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...
6.9K
Antigens Involved in Adaptive Immunity
1.7K
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...
1.7K
Antigen Presenting Cells
3.7K
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...
3.7K
Antigen Processing Pathways
2.9K
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...
2.9K


