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Related Concept Videos

Cancer-Critical Genes I: Proto-oncogenes01:33

Cancer-Critical Genes I: Proto-oncogenes

Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
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...
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...
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...
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 20, 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

Antigen processing/presenting and oncogenesis

A M Abdelnoor1

  • 1Department of Microbiology & Immunology, Faculty of Medicine, American University of Beirut, Lebanon.

Critical Reviews in Oncogenesis
|January 1, 1997
PubMed
Summary

The host immune system often fails to recognize tumor antigens due to issues with antigen processing and presentation. Therapeutic strategies like gene therapy and peptide vaccines aim to overcome this, but carry risks of autoimmune disease.

Area of Science:

  • Immunology
  • Oncology
  • Cancer Research

Background:

  • Tumor cells express antigens, but the host immune system fails to recognize them.
  • The antigen processing and presentation machinery is critical for initiating an immune response against cancer.

Purpose of the Study:

  • To review the causes of immune system failure in processing/presenting tumor antigens.
  • To discuss therapeutic strategies for enhancing anti-tumor immunity.
  • To highlight the risks associated with inducing immune responses to tumor antigens.

Main Methods:

  • Review of existing literature on tumor immunology and antigen presentation.
  • Analysis of factors affecting major histocompatibility complex (MHC) and costimulatory molecule expression.
  • Evaluation of cytokine profiles in the tumor microenvironment.

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Fabrication of Anisotropic Polymeric Artificial Antigen Presenting Cells for CD8+ T Cell Activation
10:16

Fabrication of Anisotropic Polymeric Artificial Antigen Presenting Cells for CD8+ T Cell Activation

Published on: October 12, 2018

Enrich and Expand Rare Antigen-specific T Cells with Magnetic Nanoparticles
09:28

Enrich and Expand Rare Antigen-specific T Cells with Magnetic Nanoparticles

Published on: November 17, 2018

Related Experiment Videos

Last Updated: Jul 20, 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

Fabrication of Anisotropic Polymeric Artificial Antigen Presenting Cells for CD8+ T Cell Activation
10:16

Fabrication of Anisotropic Polymeric Artificial Antigen Presenting Cells for CD8+ T Cell Activation

Published on: October 12, 2018

Enrich and Expand Rare Antigen-specific T Cells with Magnetic Nanoparticles
09:28

Enrich and Expand Rare Antigen-specific T Cells with Magnetic Nanoparticles

Published on: November 17, 2018

Main Results:

  • Deficiencies in MHC and costimulatory molecule expression by tumor cells impair immune recognition.
  • Tumor cell-intrinsic factors and cytokine milieu contribute to immune evasion.
  • Gene therapy (MHC, costimulatory molecules, cytokines, tumor antigens) and tumor peptide vaccines show therapeutic potential.

Conclusions:

  • Understanding antigen processing defects is key to developing effective cancer immunotherapies.
  • Therapeutic interventions can enhance anti-tumor immune responses but require careful consideration of potential autoimmune side effects.