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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.
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B Cell Activation and Differentiation01:24

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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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Cells of the Adaptive Immune Response01:23

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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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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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Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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Updated: Jun 16, 2025

Mouse Na&#239;ve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets
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B cells shape naive CD8+ T cell programming.

Cameron Manes1, Miguel Guerrero Moreno1, Jennifer Cimons1

  • 1Department of Immunology and Microbiology.

The Journal of Clinical Investigation
|April 17, 2025
PubMed
Summary
This summary is machine-generated.

B cells are crucial for maintaining the quiescent state of naïve CD8 T cells, ensuring effective T cell memory formation after vaccination. Their absence leads to an effector-skewed phenotype, impairing immune responses.

Keywords:
Adaptive immunityAutoimmunityImmunologyImmunotherapyRheumatologyVaccines

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • B cells are essential for CD8 T cell memory formation.
  • The role of B cells in programming naïve CD8 T cells remains unclear.

Purpose of the Study:

  • To investigate how B cells influence the programming of naïve CD8 T cells before an immune response.
  • To understand the impact of B cell absence on CD8 T cell phenotype and function.

Main Methods:

  • RNA sequencing to analyze transcriptional programs in CD8 T cells.
  • Comparison of CD8 T cells from mice and human patients with and without B cells.
  • Assessment of CD8 T cell memory formation after COVID vaccination in patients lacking B cells.

Main Results:

  • B cells sustain the FOXO1 transcriptional program, critical for CD8 T cell homeostasis.
  • Absence of B cells results in an effector-skewed phenotype in naïve CD8 T cells.
  • Human patients undergoing B cell-depleting therapy show similar CD8 T cell phenotypes and impaired memory formation.

Conclusions:

  • B cells promote naïve CD8 T cell quiescence, preparing them for memory cell development.
  • B cells are vital for establishing robust CD8 T cell memory crucial for effective immunity.