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Related Concept Videos

Antigen Processing Pathways01:31

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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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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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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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Variations in MHC class I antigen presentation and immunopeptidome selection pathways.

Anita J Zaitoua1, Amanpreet Kaur1, Malini Raghavan1

  • 1Department of Microbiology and Immunology, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA.

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Major histocompatibility class I (MHC-I) proteins are crucial for immune surveillance. Understanding their assembly and peptide presentation offers new avenues for immunotherapy.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Structural Biology

Background:

  • Major histocompatibility class I (MHC-I) proteins are key players in immune surveillance, presenting peptides to T cells and NK cells.
  • Human MHC-I molecules exhibit high polymorphism, leading to diverse cell surface peptide displays.
  • MHC-I assembly relies on numerous intracellular factors, including TAP, tapasin, and ERAPs.

Purpose of the Study:

  • To elucidate the structural features and assembly mechanisms of MHC-I molecules.
  • To understand the role of intracellular factors in MHC-I peptide loading and quality control.
  • To explore unconventional MHC-I assembly routes for potential immunotherapy applications.

Main Methods:

  • Mass spectrometry to analyze MHC-I peptidomes.
  • Structural biology techniques to study assembly factors.
  • Studies on intracellular assembly pathways and quality control mechanisms.

Main Results:

  • Characterization of unique and shared peptidome features across MHC-I variants.
  • Insights into the structural basis of MHC-I assembly factor function and peptide exchange.
  • Identification of conformational sensing in MHC-I quality control.
  • Discovery of unconventional MHC-I assembly routes.

Conclusions:

  • MHC-I assembly is a complex process involving multiple factors and quality control checkpoints.
  • Understanding MHC-I structure-function relationships is vital for immune recognition.
  • Unconventional MHC-I assembly pathways present opportunities for novel immunotherapies.