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Related Concept Videos

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...
Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

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.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
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,...
T Cell Types and Functions01:24

T Cell Types and Functions

When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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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Why CD8+ T cells need diversity when growing up.

Kristin A Hogquist1, Yan Xing

  • 1Center for Immunology, University of Minnesota, Minneapolis, MN 55414, USA. hogqu001@umn.edu

Immunity
|February 16, 2010
PubMed
Summary
This summary is machine-generated.

The proteasome subunit beta5t is crucial for CD8+ T cell development. It functions by modifying peptide-MHC complexes on thymic epithelial cells, impacting T cell selection.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • The proteasome subunit beta5t (thymus-specific) is vital for positive selection of CD8+ T cells.
  • Its precise role in T cell development has been under investigation.

Purpose of the Study:

  • To elucidate the mechanism by which beta5t influences the positive selection of CD8+ T cells.
  • To investigate the impact of beta5t on peptide-MHC complex presentation in the thymus.

Main Methods:

  • Analysis of thymus-specific proteasome subunit beta5t.
  • Investigation of peptide-MHC complex display on cortical epithelial cells.
  • T cell selection assays.

Main Results:

  • Beta5t was found to be essential for the positive selection of CD8+ T cells.
  • The study suggests beta5t alters the specific peptide-MHC complexes presented by cortical epithelial cells.

Conclusions:

  • Beta5t plays a critical role in thymic T cell selection by modulating peptide-MHC presentation.
  • This modulation is key to ensuring proper development of CD8+ T cells.