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Related Concept Videos

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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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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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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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
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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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Updated: Apr 22, 2026

Purification of the Membrane Compartment for Endoplasmic Reticulum-associated Degradation of Exogenous Antigens in Cross-presentation
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Antigen processing and presentation to T cells.

H M Grey1, R Chesnut1

  • 1Division of Basic Immunology, Department of Medicine, National Jewish Hospital and Research Center, USA; Departments of Pathology, Microbiology and Immunology, and Medicine, University of Colorado Health Sciences Center, Denver, CO 80206, USA.

Immunology Today
|October 8, 2014
PubMed
Summary
This summary is machine-generated.

Recent insights reveal the mechanism of antigen presentation and highlight the necessity of antigen processing for effective T cell stimulation. Understanding this process is crucial for immune response research.

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Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • Antigen presentation is a critical process in adaptive immunity.
  • T cell stimulation relies on the proper presentation of antigens.

Purpose of the Study:

  • To describe recent advancements in understanding antigen presentation mechanisms.
  • To discuss the role of antigen processing in T cell activation.

Main Methods:

  • Review of current literature on antigen presentation.
  • Analysis of experimental data on T cell responses.

Main Results:

  • Novel insights into the molecular pathways of antigen presentation.
  • Evidence supporting the essential role of antigen processing for T cell stimulation.

Conclusions:

  • The mechanism of antigen presentation is complex and continues to be elucidated.
  • Antigen processing is indispensable for initiating T cell-mediated immunity.