Mycobacterium lepraeに特異的なヒトT細胞エピトープが,HLA-DR2ペプチドと交叉反応する
D C Anderson1, W C van Schooten, M E Barry
1University of Washington, Seattle 98195.
まとめ
研究者は,T細胞によって認識されるMycobacterium leprae抗原の特定のエピトープを特定しました. この発見は,T細胞の反応と潜在的な交叉反応性を理解することによって,効果的な麻痺ワクチンの開発に不可欠です.
科学分野:
- 免疫学 免疫学とは
- ワクチン学 ワクチン学
- 微生物学 微生物学とは
背景:
- Mycobacterium lepraeは,様々な免疫反応によって特徴づけられる病気である麻痺を引き起こす.
- ほとんどの被曝者は防御的な免疫を発達させますが,少数者は免疫病理学を経験します.
研究 の 目的:
- T細胞によって認識されるMycobacterium leprae抗原の特定のエピトープを定義する.
- ワクチン開発のために,麻痺患者におけるT細胞の反応性を調査する.
主な方法:
- 結核性麻痺患者からのT細胞クローンの分析.
- 合成ペプチドを用いて,M. lepraeのエピトープを特定する.
- M. lepraeとHLA-DR2ペプチドによるT細胞活性化を評価する.
主要な成果:
- 65kDのM. lepraeタンパク質の特定のエピトープ (Leu-Gln-Ala-Ala-Pro-Ala-Leu-Asp-Lys-Leu) が特定されました.
- このエピトープは,HLA-DR2に制限された,M. leprae特有のヘルパーT細胞クローンによって認識されました.
- M. lepraeのエピトープとHLA-DR2ペプチドの間に予期せぬクロス反応が観察されました.
結論:
- 特定されたM. lepraeのエピトープは,麻痺患者からのT細胞によって認識されます.
- 宿主ペプチドとの交叉反応性は,ハンセン病に対するサブユニットワクチンの設計において考慮する必要がある.
- エピトープの認識を理解することは,効果的な麻痺ワクチンの開発の鍵です.
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Cross-reactivity
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.
Diversity of Antigen Receptors
Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
Antigen Processing Pathways
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...
T 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...
