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Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

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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.
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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.
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Tumor Immunotherapy01:27

Tumor Immunotherapy

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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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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.
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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.
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Neoantigen Controversies.

Andrea Castro1,2, Maurizio Zanetti3,4, Hannah Carter2,4

  • 1Biomedical Informatics Program, University of California San Diego, La Jolla, California 92093, USA.

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Summary
This summary is machine-generated.

Next-generation sequencing reveals tumor neoantigens that can trigger immune responses. However, their role in immunotherapy success is debated, necessitating a focus on the tumor-immune interface for improved cancer treatment strategies.

Keywords:
immunotherapyneoantigensprecision medicinetumor evolution

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Area of Science:

  • Oncology
  • Immunology
  • Genomics

Background:

  • Next-generation sequencing (NGS) enables comprehensive analysis of tumor genomes.
  • Somatic mutations in tumors can generate neoantigens, which are targets for the immune system.
  • The efficacy of immunotherapies targeting neoantigens has yielded mixed results.

Purpose of the Study:

  • To review conflicting evidence regarding the role of neoantigens in immunotherapy.
  • To identify key factors at the tumor-immune interface influencing immunotherapy response.
  • To provide insights for improving future immunotherapy approaches.

Main Methods:

  • Literature review of studies on tumor neoantigens and immunotherapy.
  • Analysis of conflicting data on neoantigen-based cancer treatments.
  • Identification of critical determinants of the tumor-immune microenvironment.

Main Results:

  • Conflicting reports exist on the direct correlation between neoantigens and immunotherapy success.
  • The tumor-immune interface plays a crucial role in determining the impact of neoantigens.
  • Specific factors within the tumor microenvironment modulate immune recognition and response.

Conclusions:

  • Neoantigens are not solely sufficient for successful immunotherapy.
  • Understanding the tumor-immune interface is critical for predicting and enhancing immunotherapy outcomes.
  • Future strategies should integrate neoantigen identification with modulation of the tumor-immune microenvironment.