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Related Concept Videos

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.
Formation of Lipopolysaccharides01:19

Formation of Lipopolysaccharides

Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin, triggering...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

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Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
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...
What is the Immune System?01:38

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Antigenic Liposomes for Generation of Disease-specific Antibodies
10:31

Antigenic Liposomes for Generation of Disease-specific Antibodies

Published on: October 25, 2018

How the immune system detects lipid antigens.

Gennaro De Libero1, Lucia Mori

  • 1Experimental Immunology, Department of Biomedicine University Hospital, University of Basel, CH-4031 Basel, Switzerland. gennaro.delibero@unibas.ch

Progress in Lipid Research
|October 28, 2009
PubMed
Summary

T cells recognize lipid antigens presented by CD1 molecules, crucial for immunity against infections, cancer, and autoimmunity. Understanding these interactions drives new lipid-based immunotherapies.

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Published on: December 31, 2007

Area of Science:

  • Immunology
  • Molecular Biology
  • Structural Biology

Background:

  • T lymphocytes recognize antigens, but their interaction with lipids via CD1 molecules is a specialized pathway.
  • CD1 proteins present diverse lipid antigens to T cells, playing roles in immune surveillance and regulation.

Purpose of the Study:

  • To elucidate the structural basis of T cell receptor recognition of CD1-lipid complexes.
  • To highlight the immunological significance of lipid antigens in health and disease.

Main Methods:

  • Analysis of crystal structures of T cell receptor-CD1-lipid complexes.
  • Investigation of lipid antigen processing and presentation by antigen-presenting cells.

Main Results:

  • Structural data reveals how T cell receptors engage CD1-lipid complexes, involving both CD1 and lipid residues.
  • Lipid antigenicity is influenced by cellular handling, trafficking, and CD1 binding dynamics.

Conclusions:

  • Lipid-specific T cell responses are vital for autoimmunity, cancer immunity, infection control, and immunoregulation.
  • The immunogenicity of lipids is a promising target for developing novel immunotherapies, including vaccines and treatments for autoimmune diseases.