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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...
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.
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...
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...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
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...

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Related Experiment Video

Updated: Jul 13, 2026

Purification of the Membrane Compartment for Endoplasmic Reticulum-associated Degradation of Exogenous Antigens in Cross-presentation
12:48

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

Published on: August 21, 2017

MHC class II molecules: transport pathways for antigen presentation.

R Wubbolts, M Fernandez-Bona, J Neefjes

    Trends in Cell Biology
    |March 1, 1997
    PubMed
    Summary

    This study explores how Major Histocompatibility Complex (MHC) class II molecules bind peptides during their cellular journey. Understanding this process is key to how the immune system generates antibody responses.

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    Assessing the Expression of Major Histocompatibility Complex Class I on Primary Murine Hippocampal Neurons by Flow Cytometry
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    Assessing the Expression of Major Histocompatibility Complex Class I on Primary Murine Hippocampal Neurons by Flow Cytometry

    Published on: May 19, 2020

    Area of Science:

    • Immunology
    • Cell Biology
    • Molecular Biology

    Background:

    • Major Histocompatibility Complex (MHC) class II molecules are crucial for adaptive immunity.
    • These molecules traffic through the endocytic pathway during biosynthesis.
    • Interaction with antigenic peptides is a critical step before cell surface presentation.

    Purpose of the Study:

    • To elucidate the cell-biological events governing MHC class II molecule function.
    • To understand the role of peptide association in MHC class II maturation and immune response.
    • To investigate how cellular processes direct specific antibody production.

    Main Methods:

    • The study likely involves techniques to track MHC class II trafficking within cells.
    • Methods may include peptide binding assays to analyze molecular interactions.
    • Analysis of cell surface expression and immune cell activation would be employed.

    Main Results:

    • MHC class II molecules engage with antigenic peptides within the endocytic pathway.
    • The stable insertion of MHC class II-peptide complexes at the plasma membrane is confirmed.
    • These molecular events are shown to be essential for initiating adaptive immune responses.

    Conclusions:

    • Cell-biological events, particularly peptide binding and trafficking, are critical regulators of MHC class II function.
    • Understanding these mechanisms provides insights into the initiation of specific antibody responses.
    • This research highlights the link between cellular pathways and the adaptive immune system's efficacy.