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Related Concept Videos

T Cell Types and Functions01:24

T Cell Types and Functions

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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.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
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T Cell Activation and Clonal Selection01:22

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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.
Naive T cells that have not yet encountered an antigen express two primary CD...
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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.
Complete Antigens
Complete antigens possess both immunogenicity and...
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B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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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.
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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Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

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Overview
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Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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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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Related Experiment Video

Updated: Nov 1, 2025

Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets
07:12

Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets

Published on: April 16, 2015

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Human TH1 and TH2 Subsets.

Sergio Romagnani, Gianfranco Del Prete, Enrico Maggi

    International Archives of Allergy and Immunology
    |June 25, 2021
    PubMed
    Summary
    This summary is machine-generated.

    Human helper T cells, categorized as TH1 and TH2, exhibit distinct cytokine profiles and functions. TH1 cells combat intracellular pathogens and are implicated in autoimmune diseases, while TH2 cells drive allergic responses.

    Keywords:
    CytokinesTH1TH2

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    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • Human CD4+ T cell clones analogous to murine TH1 and TH2 cells have been identified.
    • These clones display distinct cytokine secretion patterns and functional characteristics based on antigen stimulation.

    Purpose of the Study:

    • To characterize the functional properties and cytokine profiles of human TH1 and TH2 T cell clones.
    • To elucidate the roles of TH1 and TH2 cells in immunity and disease pathogenesis.

    Main Methods:

    • Generation and characterization of human CD4+ T cell clones.
    • Analysis of cytokine production patterns.
    • Assessment of functional properties, including cytolytic potential and help for antibody production.

    Main Results:

    • TH1 clones, stimulated by intracellular bacteria/viruses, possess cytolytic potential and do not aid IgE production.
    • TH2 clones, stimulated by allergens/helminths, support immunoglobulin synthesis (IgM, IgG, IgA, IgE) and lack cytolytic activity.
    • Innate immunity cytokine profiles may dictate subsequent TH1 responses.

    Conclusions:

    • Human TH1 and TH2 cells represent distinct effector lineages with specialized roles in immunity.
    • TH1 cells are crucial for defense against intracellular pathogens and implicated in autoimmune diseases like Hashimoto's thyroiditis.
    • TH2 cells initiate allergic reactions and are involved in humoral immunity.