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Related Concept Videos

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.
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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.
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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.
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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Diversity of Antigen Receptors01:28

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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.
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Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β2-Microglobulin
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Mutations of class II MHC molecules.

L H Glimcher1, I J Griffith1

  • 1Department of Cancer Biology, Harvard School of Public Health, Boston, MA 02115, USA; Department of Medicine, Harvard Medical School, Boston, MA 02115, USA.

Immunology Today
|October 26, 2014
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Summary
This summary is machine-generated.

Investigating the structure and function of the la molecule, this study uses mutant mouse strains to understand T-cell receptor interactions and helper T-cell diversity.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • The diversity of the helper T-cell repertoire is crucial for adaptive immunity.
  • The precise mechanisms by which T-cell receptor, la molecule, and foreign antigen interactions generate this diversity are not fully understood.

Purpose of the Study:

  • To elucidate the relationship between the structure and function of the la molecule.
  • To explore the role of the la molecule in T-cell receptor interactions and repertoire diversity.

Main Methods:

  • Utilizing mouse strains with specific mutations in genes encoding la glycoproteins.
  • Analyzing the structural and functional consequences of these genetic alterations.

Main Results:

  • The study provides insights into how structural variations in the la molecule affect its function.
  • Observed changes in T-cell interactions and repertoire diversity correlate with specific la molecule mutations.

Conclusions:

  • Structural aspects of the la molecule significantly influence the diversity of the helper T-cell repertoire.
  • Understanding la molecule structure-function relationships is key to deciphering T-cell repertoire generation.