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Related Concept Videos

Antigen Processing Pathways01:31

Antigen Processing Pathways

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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.
MHC Class I: Presenting Endogenous...
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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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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.
Complete Antigens
Complete antigens possess both immunogenicity and...
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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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B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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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...
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Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

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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.
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

Updated: Sep 27, 2025

Purification of the Membrane Compartment for Endoplasmic Reticulum-associated Degradation of Exogenous Antigens in Cross-presentation
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A guide to antigen processing and presentation.

Novalia Pishesha1,2,3, Thibault J Harmand1, Hidde L Ploegh4

  • 1Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA.

Nature Reviews. Immunology
|April 14, 2022
PubMed
Summary
This summary is machine-generated.

Antigen processing and presentation are crucial for adaptive immunity, enabling T cells to recognize foreign invaders. This review details the six essential steps involved in displaying peptides on MHC molecules for T cell recognition.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Adaptive immunity relies on T cells for effective immune responses.
  • T cell activation requires recognition of peptide-MHC complexes.
  • Major histocompatibility complex (MHC) molecules present peptides to T cells.

Purpose of the Study:

  • To review the fundamental processes of antigen processing and presentation.
  • To elucidate the six discrete steps involved in antigen presentation pathways.
  • To compare mechanisms of antigen acquisition, degradation, and MHC loading.

Main Methods:

  • Review of established literature on antigen processing and presentation.
  • Comparative analysis of MHC class I and class II antigen presentation pathways.
  • Detailed description of protein degradation and peptide loading mechanisms.

Main Results:

  • Antigen presentation involves distinct pathways for MHC class I and class II molecules.
  • Six key steps govern the acquisition, processing, and display of antigenic peptides.
  • Understanding these steps is vital for comprehending T cell-mediated immunity.

Conclusions:

  • Antigen processing and presentation are essential for adaptive immunity.
  • MHC class I and II pathways efficiently present diverse antigenic peptides.
  • This review provides a comprehensive overview of these critical immunological processes.