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Related Concept Videos

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.
Naive T cells that have not yet encountered an antigen express two primary CD...
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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.
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Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

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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,...
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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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Cell-mediated Immune Responses01:40

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Immunological Memory01:23

Immunological Memory

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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
What is Immunological Memory?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature...
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Related Experiment Video

Updated: Apr 17, 2026

Isolation of CD4+ T-cells and Analysis of Circulating T-follicular Helper cTfh Cell Subsets from Peripheral Blood Using 6-color Flow Cytometry
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Isolation of CD4+ T-cells and Analysis of Circulating T-follicular Helper cTfh Cell Subsets from Peripheral Blood Using 6-color Flow Cytometry

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Functions and features of circulating memory T cells.

Stephen C Jameson1, Sara E Hamilton1

  • 1Center for Immunology, Department of Laboratory Medicine and Pathology, University of Minnesota Medical School, Minneapolis, MN 55455, USA.

Immunity
|April 15, 2026
PubMed
Summary
This summary is machine-generated.

Circulating memory T (TMEM) cells, or Tcircm cells, exist in diverse states. This review explores how Tcircm cells and tissue-resident Trm cells collaborate for robust immunity against pathogens and tumors.

Keywords:
T cell memoryrecirculationresidency

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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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Area of Science:

  • Immunology
  • Cellular Biology
  • T cell biology

Background:

  • Memory T (TMEM) cells are crucial for adaptive immunity.
  • Tcircm cells were historically viewed as recirculating effectors.
  • Recent research highlights tissue-resident Trm cells, prompting a re-evaluation of Tcircm roles.

Purpose of the Study:

  • To review the current understanding of circulating memory T (Tcircm) cell subsets.
  • To explore the integration and complementary functions of Tcircm and Trm cells.
  • To discuss the differentiation, homeostasis, and immunological roles of Tcircm cells.

Main Methods:

  • Literature review and synthesis of existing research on T cell memory.
  • Analysis of functional properties and identifying characteristics of Tcircm subsets.
  • Discussion of differentiation pathways and homeostatic mechanisms.

Main Results:

  • Tcircm cells represent a spectrum of differentiated populations with varied functions.
  • Tcircm cells and Trm cells likely play integrated roles in host defense.
  • Understanding Tcircm subsets is key to developing versatile and effective immunotherapies.

Conclusions:

  • Tcircm cells are essential components of immunological memory, complementing Trm cells.
  • Further research into Tcircm cell heterogeneity will advance vaccine and cancer immunotherapy development.
  • Tcircm cells offer potential for versatile, safe, and effective immune responses.