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Related Concept Videos

Overview of Exosomes01:36

Overview of Exosomes

Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
Stahl et al. discovered exosomes in 1983, but the exosomes were initially considered waste products released from the...
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.
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
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...

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Related Experiment Video

Updated: Jun 6, 2026

Isolation and Characterization of RNA-Containing Exosomes
09:43

Isolation and Characterization of RNA-Containing Exosomes

Published on: January 9, 2012

Exosomal membrane molecules are potent immune response modulators.

Paras K Anand1

  • 1Cell Biology and Biophysics Unit; European Molecular Biology Laboratory; Heidelberg, Germany.

Communicative & Integrative Biology
|November 9, 2010
PubMed
Summary

Exosomes, small vesicles released by cells, can modulate immune responses. This review focuses on how membrane proteins like Hsp70 initiate these immune responses.

Keywords:
Hsp70TLRsexosomesgalectinmacrophagephagosome

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Area of Science:

  • Cell biology
  • Immunology
  • Extracellular vesicles

Background:

  • Exosomes are endosome-derived vesicles involved in intercellular communication.
  • They are released by various cell types, including antigen-presenting cells.
  • Exosomes possess immunomodulatory properties, with mechanisms of action under investigation.

Purpose of the Study:

  • To review the immunomodulatory roles of exosomes.
  • To explore the mechanisms by which exosomes initiate immune responses.
  • To highlight the significance of exosomal membrane molecules in immune modulation.

Main Methods:

  • Literature review of exosome research.
  • Analysis of studies on exosome-mediated immune responses.
  • Focus on specific exosomal membrane molecules.

Main Results:

  • Exosomes can induce immune responses through interactions between their membrane molecules and target cell receptors.
  • Hsp70 and galectin-5 are identified as key immunogenic molecules on the exosomal membrane.
  • These molecules play a crucial role in initiating immune responses.

Conclusions:

  • Exosomal membrane molecules are critical for initiating immune responses.
  • Hsp70 and galectin-5 are significant contributors to exosome-mediated immunomodulation.
  • Further research into exosome-surface molecules can advance understanding of immune regulation.