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Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

428
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...
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Cross-reactivity00:42

Cross-reactivity

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Overview
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Antigen Processing Pathways01:31

Antigen Processing Pathways

862
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...
862
Tumor Immunotherapy01:27

Tumor Immunotherapy

450
Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
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Antigen Presenting Cells01:22

Antigen Presenting Cells

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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...
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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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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...
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STINGアゴニストベースのERターゲティング分子は,抗原のクロスプレゼンテーションを促進する.

Xiafeng Wang1,2, Zhangping Huang2, Lixiao Xing3

  • 1Department of Laboratory Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.

Nature
|March 27, 2025
PubMed
まとめ

研究者らは,STINGアゴニストベースのERターゲティング分子 (SABER) を開発し,CD8+T細胞の反応を強化した. 腫瘍や感染症に対するワクチンの有効性を向上させる.

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科学分野:

  • 免疫学
  • ワクチン学
  • 分子生物学

背景:

  • CD8+T細胞の反応は,感染症と腫瘍との闘いにおいて極めて重要です.
  • dendritic 細胞の内プラズマ網膜 (ER) の抗原交差は,CD8+ T細胞誘導の鍵となる.
  • 現在の抗原伝達方法は,特に細胞溶液からERへの経路では,サブセルラー精度が欠けている.

研究 の 目的:

  • 抗原のための新しいER標的配送システムを開発する.
  • CD8+ T細胞の免疫反応を精密なサブセルラー伝達によって強化する.
  • 開発されたシステムの補助的な性質を調査する.

主な方法:

  • STINGアゴニストベースのERターゲティング分子 (SABER) の開発
  • SABERを様々な抗原 (腫瘍新抗原,ウイルスエピトープ) に結合する.
  • 臨床前モデルにおけるCD8+ T細胞誘導と免疫応答の評価
  • SARS-CoV-2サブユニットワクチンモデルにおけるSABERの補助効果の評価.

主要な成果:

  • SABERはERに抗原を効果的に送って マイクロリアクターを形成します
  • SABERとの結合は,腫瘍とウイルス抗原に対するCD8+ T細胞の反応を著しく強化する.
  • SABERは,従来の補助剤や抗原/アゴニスト混合物と比較して優れた有効性を示しています.
  • SABERは強力な補助剤として作用し,SARS-CoV-2ワクチンに対する中和抗体の反応を改善します.

結論:

  • SABERは高度なアフィニティERターゲティングの投与システムであり,ワクチン補助剤です.
  • ERのクロスプレゼンテーションメカニズムへの正確なサブセルラー配送は,ワクチンの設計における重要な進歩を可能にします.
  • このアプローチは,強力なCD8+T細胞媒介免疫を誘発する質的飛躍をもたらします.