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細胞内在の免疫は,cGAMPの細胞間移転を経由して,傍観細胞に広がります
Andrea Ablasser1, Jonathan L Schmid-Burgk, Inga Hemmerling
1Institute for Clinical Chemistry and Clinical Pharmacology, University Hospital, University of Bonn, 53127 Bonn, Germany.
Nature
|October 1, 2013
まとめ
免疫細胞は,ギャップ・ジャンクションを通じて抗ウイルス信号を共有する. cGAS酵素によって合成されたサイクルGMP-AMP (cGAMP) は,タイプIインターフェロンに頼らずに細胞間を移動し,STINGを活性化し,抗ウイルス免疫を促進します.
科学分野:
- 免疫学 免疫学とは
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
背景:
- 多細胞生物は,病原体に対する先天的な免疫防衛のために細胞の協力に依存しています.
- 免疫細胞間の情報交換は,主にサイトカインやケモカインなどの溶解性タンパク質因子によって媒介されます.
- I型インターフェロン (IFN) は,細胞に病原体の存在を警告し,抗ウイルス反応を開始するために不可欠です.
研究 の 目的:
- 抗ウイルス免疫における細胞間通信のメカニズムを調査する.
- 細胞内DNA感知経路が細胞から細胞への信号伝達を伴うかどうかを判断する.
- 迅速な抗ウイルス防御のための新しい宿主戦略を探求する.
主な方法:
- 免疫シグナリングを研究するために,マウリンとヒトの細胞モデルを使用しました.
- サイクルGMP-AMP (cGAMP) 合成酵素 (cGAS) とSTING経路の役割を調査しました.
- ギャップ・ジャンクションを通じたcGAMP ((2'-5') の伝達と,傍観者の免疫に対するその影響を調査した.
主要な成果:
- cGASで合成されたcGAMP ((2'-5') が,ギャップ・ジャンクション経由で隣接する細胞間で伝達されることが発見されました.
- 細胞間cGAMP転送が受容細胞のSTINGを活性化し,抗ウイルス免疫を与えることを実証しました.
- この傍観者免疫は,タイプIのIFNシグナル伝達とは独立して動作し,様々なコネクシンを伴うことが示されました.
結論:
- 横の,転写独立の抗ウイルス免疫の新しいメカニズムを特定しました.
- cGAMP ((2'-5') ギャップ・ジャンクション経由の転送は,迅速で局所的な免疫協力戦略を表しています.
- この経路は,先天的な免疫防衛の調整の,これまで認識されていない側面を強調しています.
関連する概念動画
Cell-mediated Immune Responses
Overview
Antigens 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.
Cells of the Innate Immune Response
The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
B 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...
Defense Against Bacterial Pathogens
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Intracellular Signaling Cascades
Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...

