ER-ファゴソーム融合は,デンドリット細胞のMHCクラスIクロスプレゼンテーションコンパートメントを定義しています
Pierre Guermonprez1, Loredana Saveanu, Monique Kleijmeer
1INSERM U520, Institut Curie, 26 rue d'Ulm, 75005 Paris, France.
Nature
|September 26, 2003
まとめ
デンドリット細胞は,ユニークなER-ファゴソーム区画内のクロスプレゼンテーションを通じて抗原を提示します. この特殊なコンパートメントは,MHCクラスI分子にペプチドの負荷を可能にすることによって,細胞毒性T細胞免疫を促進します.
科学分野:
- 免疫学 免疫学とは
- 細胞生物学 細胞生物学
背景:
- 細胞毒性T細胞免疫は,抗原をクロスプレゼンテーションで提示するデンドリート細胞に依存しています.
- 交叉プレゼンテーションのための抗原処理は,伝統的にプロテアソーマル分解とエンドプラズマ網膜 (ER) に転位を伴う.
研究 の 目的:
- dendritic 細胞でクロスプレゼンテーションが発生する正確な細胞区間を調査するために.
- クロスプレゼンテーションの際にMHCクラスI分子に抗原が負荷されるメカニズムを解明する.
主な方法:
- 先進的な顕微鏡検査と生化学分析を使用して,デンドリット細胞内の抗原とタンパク質の局所化を追跡しました.
- ファゴソームとエンドプラズマ網膜の相互作用を研究した.
主要な成果:
- ファゴソームが形成中にまたはその直後にERと融合することを実証した.
- ペプチドは,抗原プレゼンテーション (TAP) に関連するトランスポーターによって,MHCクラスI分子に負荷するためにファゴソームに転位することが示されました.
- クロスプレゼンテーションを担当する特殊なER-ファゴソームハイブリッドコンパートメントを特定しました.
結論:
- dendritic 細胞のクロスプレゼンテーションは,自閉的な ER-ファゴソーム区画の中で発生します.
- この発見は,T細胞免疫を開始するための抗原プレゼンテーションの細胞部位を再定義する.
さらに関連する動画
12:48Purification of the Membrane Compartment for Endoplasmic Reticulum-associated Degradation of Exogenous Antigens in Cross-presentation
Published on: August 21, 2017
7.4K
09:04Isolation And Dendritic Cell-Uptake of Small Extracellular Vesicles from Echinococcus granulosus
Published on: March 28, 2025
858
関連する概念動画
00:41Phagocytosis
64.8K
Cells pull particles inward and engulf them in spherical vesicles in an energy-requiring process called endocytosis. Phagocytosis (“cellular eating”) is one of three major types of endocytosis. Cells use phagocytosis to take in large objects—such as other cells (or their debris), bacteria, and even viruses.
64.8K
00:41Phagocytosis
6.9K
Cells pull particles inward and engulf them in spherical vesicles in an energy-requiring process called endocytosis. Phagocytosis ("cellular eating") is one of three major types of endocytosis. Cells use phagocytosis to take in large objects, such as other cells (or their debris), bacteria, and even viruses.
The objective of phagocytosis is often destruction. Cells use phagocytosis to eliminate unwelcome visitors, like pathogens (e.g., viruses and bacteria). Many immune system cells,...
The objective of phagocytosis is often destruction. Cells use phagocytosis to eliminate unwelcome visitors, like pathogens (e.g., viruses and bacteria). Many immune system cells,...
6.9K
01:38Intralumenal Vesicles and Multivesicular Bodies
4.0K
Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...
4.0K
01:26Antigens Involved in Adaptive Immunity
1.8K
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...
1.8K
01:22Antigen Presenting Cells
3.8K
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...
3.8K
01:31Antigen 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