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Related Concept Videos

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...
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...
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...
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,...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview

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Related Experiment Video

Updated: Jul 15, 2026

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

Local development of effector and memory T helper cells.

Nicolas Fazilleau1, Louise J McHeyzer-Williams, Michael G McHeyzer-Williams

  • 1Department of Immunology, The Scripps Research Institute, La Jolla, CA 92037, USA.

Current Opinion in Immunology
|April 11, 2007
PubMed
Summary

Clonal evolution drives adaptive immunity, with helper T (Th) cells crucial for B cell responses and vaccination. Follicular T helper (T(FH)) cells orchestrate B cell development, potentially supported by persistent antigen depots for memory.

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Evaluation of T Follicular Helper Cells and Germinal Center Response During Influenza A Virus Infection in Mice
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Published on: June 27, 2020

Area of Science:

  • Immunology
  • Cellular Biology
  • Vaccinology

Background:

  • Adaptive immunity relies on clonal evolution for T and B cell responses.
  • Helper T (Th) cell development is critical for high-affinity B cell immunity and effective vaccination.
  • Dendritic cell maturation and T cell receptor (TCR) affinity shape antigen-specific Th cell populations.

Purpose of the Study:

  • To elucidate the mechanisms of antigen-specific helper T cell development.
  • To highlight the role of follicular T helper (T(FH)) cells in orchestrating B cell immunity.
  • To explore the impact of persistent antigen on effector Th cell development and memory.

Main Methods:

  • Analysis of dendritic cell maturation and TCR affinity selection.
  • Investigation of Th cell recruitment and propagation in lymphoid tissues.
  • Examination of follicular B helper T (T(FH)) cell function in B cell development.
  • Assessment of persistent antigen depots and their role in Th cell memory.

Main Results:

  • Dendritic cell maturation and TCR affinity critically control Th cell selection and expansion.
  • Follicular T helper (T(FH)) cells are specialized effectors driving stepwise B cell immunity.
  • Persistent antigen may contribute to the formation of local antigen-specific Th cell memory.
  • Evidence suggests long-term antigen depots influence effector Th cell development.

Conclusions:

  • Antigen-specific Th cell development is a tightly regulated process essential for adaptive immunity.
  • T(FH) cells are key orchestrators of B cell maturation and antibody responses.
  • Persistent antigen represents a potential mechanism for establishing long-term Th cell memory in local tissues.