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Related Concept Videos

Antigen Processing Pathways01:31

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...
Antigen Presenting Cells01:22

Antigen Presenting Cells

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...
Antigens Involved in Adaptive Immunity01:26

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.
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
T Cell Activation and Clonal Selection01:22

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...
Diversity of Antigen Receptors01:28

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...

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Related Experiment Video

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Purification of the Membrane Compartment for Endoplasmic Reticulum-associated Degradation of Exogenous Antigens in Cross-presentation
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Pathways of antigen processing.

Janice S Blum1, Pamela A Wearsch, Peter Cresswell

  • 1Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA. jblum@iupui.edu

Annual Review of Immunology
|January 10, 2013
PubMed
Summary
This summary is machine-generated.

This review explores how major histocompatibility complex (MHC) molecules sample peptides for T cell recognition. Understanding MHC-I and MHC-II biosynthesis and assembly is key for immune responses and tolerance.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • T cell recognition relies on peptides presented by major histocompatibility complex class I (MHC-I) and class II (MHC-II) molecules on antigen-presenting cells.
  • Effective T cell responses against pathogens and transformed cells, as well as self-tolerance, depend on the processing and presentation of specific peptides.
  • Cells employ diverse mechanisms for antigen acquisition, including cytosolic translation and endocytosis, followed by degradation.

Purpose of the Study:

  • To review the intricate relationship between major histocompatibility complex (MHC) molecule biosynthesis and assembly with antigen processing pathways.
  • To highlight how MHC-I and MHC-II pathways intersect with cellular mechanisms to sample and present peptides.

Main Methods:

  • This is a review article, synthesizing existing research on MHC biosynthesis, assembly, and antigen processing.
  • Analysis of cellular pathways involved in antigen acquisition, degradation, and peptide loading onto MHC molecules.

Main Results:

  • MHC-I and MHC-II biosynthesis and assembly are strategically integrated with cellular antigen processing pathways.
  • Cells have evolved sophisticated mechanisms to ensure accurate sampling and presentation of a diverse peptide repertoire.
  • The intersection of these pathways is crucial for both adaptive immunity and the maintenance of self-tolerance.

Conclusions:

  • The interplay between MHC biosynthesis/assembly and antigen processing is fundamental for T cell-mediated immunity and immune homeostasis.
  • Understanding these molecular interactions provides insights into immune system function and potential therapeutic targets.
  • Further research into these intersecting pathways can illuminate mechanisms of disease and inform vaccine development.