ウイルスの感染に対する早期の保護免疫の調整は,レギュレータ性T細胞によって行われる
Jennifer M Lund1, Lianne Hsing, Thuy T Pham
1Department of Immunology and Howard Hughes Medical Institute, University of Washington, Seattle, WA 98195, USA.
Science (New York, N.Y.)
|April 26, 2008
まとめ
調節性T細胞 (Tregs) は,ヘルペス・シンプレックスウイルスの制御に不可欠です. 消去されたTregsは致死性感染症を加速させ,免疫細胞が感染した組織に侵入するのを促進する役割を示した.
科学分野:
- 免疫学 免疫学とは
- ウイルス学 ウイルス学 ウイルス学
- 感染症 感染症は感染症です.
背景:
- 調節性T細胞 (Tregs) は,免疫反応を抑制することが知られている.
- この抑制は,病原体特異的免疫を制限し,感染の後の段階で組織損傷を最小限に抑えるために仮定されています.
研究 の 目的:
- 粘膜ヘルペスシンプレックスウイルス (HSV) 感染症におけるTregsの役割を調査する.
- Tregsが免疫細胞の密輸と感染部位での抗ウイルス反応にどのように影響するかを理解する.
主な方法:
- 粘膜 HSV 感染症のマウスモデルを使用しました.
- 消去された調節性T細胞 (Tregs) が,感染進行への影響を評価する.
- 粘膜と中枢神経系における定量化されたウイルス負荷.
- 感染部位における免疫細胞集団 (天然殺虫細胞,樹状細胞,T細胞) を測定した.
- 排水リンパ節 (dLNs) と感染部位におけるサイトカインとケモカインのレベルを評価した.
主要な成果:
- Tregの除去により,ウイルスの負荷が増加し,HSV感染が加速し,致死に至った.
- インターフェロンの生成はDLNで増加したが,Treg欠乏マウスでは感染部位で減少した.
- 免疫細胞 (NK細胞,樹状細胞,T細胞) の感染部位への到着が遅れていることが観察されました.
- 炎症誘発性ケモカインのレベルは,Treg欠乏したマウスのDLNで有意に上昇した.
結論:
- 調節性T細胞 (Tregs) は,局所性ウイルス感染症に対する早期の防御免疫において重要な役割を果たします.
- Tregsは,免疫細胞が感染した組織に適時に入ることを促進し,ウイルスの複製を制御するために不可欠です.
- この発見は,Treg媒介による抑制が,後期的な免疫を制限するだけという考えに異議を唱え,保護的反応を開始する上でその重要性を強調しています.
関連する概念動画
01:29Immune Response Against Viral Pathogens
The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
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...
01:22T 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...
01:27Cytotoxic 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...
01:40Cell-mediated Immune Responses
Overview
01:20Special Features of Adaptive Immunity
The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...