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Related Concept Videos

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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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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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.
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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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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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Stem cells are undifferentiated cells that divide and produce different cell types. Ordinarily, cells that have differentiated into a specific cell type are terminally differentiated; however, scientists have found a way to reprogram these mature cells so that they dedifferentiate and return to an unspecialized, proliferative state. These cells are pluripotent like embryonic stem cells—able to produce all cell types—and are called induced pluripotent stem cells (iPSCs).
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Messing with Signal 1: How Perturbed MHC Class I Antigen Presentation Contributes to Cancer.

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  • 1Department of Biology, Faculty of Arts and Sciences, Souk El-Gharb Campus, University of Balamand, Aley 1501, Lebanon.

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Summary
This summary is machine-generated.

The Major Histocompatibility Complex class I antigen presentation machinery is crucial for T cell activation. Its disruption can impair immune function and drive cancer progression, offering therapeutic targets.

Keywords:
MHC class IT cellsantigen presentationantigen-presenting cellcancercytokinecytotoxicity

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Area of Science:

  • Immunology
  • Molecular Biology
  • Oncology

Background:

  • The antigen presentation machinery is essential for adaptive cellular immunity.
  • Dysregulation of antigen presentation is implicated in various diseases, including cancer.

Purpose of the Study:

  • To review the function of Major Histocompatibility Complex class I (MHC I) antigen presentation machinery.
  • To highlight how MHC I perturbations contribute to compromised immune function and cancer progression.
  • To categorize MHC I perturbations for an integrated view of their impact on immune recognition.

Main Methods:

  • Review of existing literature on MHC class I antigen presentation.
  • Categorization of MHC I perturbations into four mechanistic levels: peptide generation, peptide loading, MHC I integrity, and epigenetic regulation.

Main Results:

  • MHC I antigen presentation machinery controls T cell activation and adaptive immunity.
  • Perturbations in MHC I function can lead to immune evasion and disease progression in cancer.
  • Four distinct mechanistic levels of MHC I perturbation identified: peptide generation, peptide loading, MHC I integrity, and epigenetic regulation.

Conclusions:

  • Understanding MHC I perturbations provides insights into immune recognition in cancer.
  • Targeting antigen presentation pathways or exploiting MHC I alterations presents therapeutic opportunities in oncology.