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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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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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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.
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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.
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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.
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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...
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An Efficient and High Yield Method for Isolation of Mouse Dendritic Cell Subsets
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Dendritic cell subsets.

Christophe Macri1, Ee Shan Pang1, Timothy Patton1

  • 1Infection and Immunity Program, Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, 3800, Australia.

Seminars in Cell & Developmental Biology
|December 17, 2017
PubMed
Summary
This summary is machine-generated.

Dendritic cells (DCs) are key immune cells with specialized subsets. Understanding their distinct functions is crucial for T cell priming, vaccine development, and disease research.

Keywords:
Antigen presentationConventional dendritic cellsDendritic cellsPattern recognition receptorsPlasmacytoid dendritic cells

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Generation of Immature, Mature and Tolerogenic Dendritic Cells with Differing Metabolic Phenotypes

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Dendritic cells (DCs) are professional antigen-presenting cells found in various organs.
  • DCs present antigens on MHCI and MHCII, with upregulated activity upon activation.
  • Distinct DC subsets express unique pattern recognition receptors, enabling specialized responses to stimuli.

Purpose of the Study:

  • To review the different subsets of dendritic cells (DCs) in mice and humans.
  • To outline the key attributes defining the distinct functions of DC subsets.
  • To highlight the importance of understanding DC subset specialization for immunology and medicine.

Main Methods:

  • Literature review of mouse and human immunology studies.
  • Analysis of data on dendritic cell subsets and their functions.
  • Synthesis of information on pattern recognition receptors and antigen presentation.

Main Results:

  • Identification of diverse dendritic cell (DC) subsets in steady-state conditions.
  • Characterization of unique functional attributes for each DC subset.
  • Demonstration of DC subset specialization in responding to various stimuli.

Conclusions:

  • Functional specialization of dendritic cell (DC) subsets is a key attribute.
  • Knowledge of DC subsets is vital for effective T cell priming and vaccine adjuvant design.
  • Understanding DC roles is essential for comprehending health and disease processes.