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Related Concept Videos

T Cell Types and Functions01:24

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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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Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...
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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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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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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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Related Experiment Video

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Isolation and Th17 Differentiation of Na&#239;ve CD4 T Lymphocytes
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Human Th1 dichotomy: origin, phenotype and biologic activities.

Francesco Annunziato1, Lorenzo Cosmi, Francesco Liotta

  • 1Department of Experimental and Clinical Medicine and DENOTHE Center, University of Florence, Florence, 50134, Italy; Regenerative Medicine Unit and Immunology and Cellular Therapy Unit of Azienda Ospedaliera Careggi, Florence, 50134, Italy.

Immunology
|October 7, 2014
PubMed
Summary
This summary is machine-generated.

The immune system differentiates CD4+ T helper cells into Th1, Th2, and Th17 subtypes. Th17 cells can transform into non-classic Th1 cells, which possess distinct markers and roles in chronic inflammation.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • The immune system employs diverse CD4+ T helper (Th) cell subsets, including Th1, Th2, and Th17, for tailored responses to pathogens.
  • Th17 cells exhibit plasticity, converting to Th1 cells at inflammatory sites, creating a mix of classic and non-classic Th1 cells.

Purpose of the Study:

  • To review the distinct origins, phenotypic characteristics, and biological activities of classic and non-classic Th1 cells.
  • To highlight the importance of differentiating these subsets for understanding chronic inflammatory disorders.

Main Methods:

  • Review of existing literature on CD4+ T helper cell differentiation and function.
  • Analysis of phenotypic markers distinguishing classic Th1 cells from non-classic (Th17-derived) Th1 cells in humans.

Main Results:

  • Non-classic Th1 cells, derived from Th17 cells, express specific markers like CD161, retinoic acid orphan receptor C, IL-17 receptor E, IL-1RI, CCR6, IL-4-induced gene 1, and Tob-1.
  • Classic Th1 cells lack these specific markers, allowing for their distinction from non-classic Th1 cells.

Conclusions:

  • Distinguishing between classic and non-classic Th1 cells is crucial for elucidating their specific roles in chronic inflammatory diseases.
  • Understanding these distinct T helper cell subsets can lead to more targeted therapeutic strategies for inflammatory disorders.