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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

620
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...
620
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

66.6K
Overview
66.6K
Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

746
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

T Cell Types and Functions

740
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...
740
Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

703
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,...
703
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

1.4K
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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Related Experiment Video

Updated: May 22, 2025

Quantitative Imaging of Lineage-specific Toll-like Receptor-mediated Signaling in Monocytes and Dendritic Cells from Small Samples of Human Blood
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Quantitative Imaging of Lineage-specific Toll-like Receptor-mediated Signaling in Monocytes and Dendritic Cells from Small Samples of Human Blood

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General and individualized changes in T cell immunity during aging.

Nianbin Song1, Mostafa A Elbahnasawy1, Nan-Ping Weng1

  • 1Laboratory of Molecular Biology and Immunology, National Institute on Aging, NIH, Baltimore, MD, United States.

Journal of Immunology (Baltimore, Md. : 1950)
|March 12, 2025
PubMed
Summary
This summary is machine-generated.

Aging impacts the adaptive immune system, causing universal T cell changes like fewer naive T cells and more memory T cells. Individual life exposures also uniquely shape T cell receptor repertoires over time.

Keywords:
CD4+ T cellsCD8+ T cellsTCR repertoireagingspecies richness

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Tailoring In Vivo Cytotoxicity Assays to Study Immunodominance in Tumor-specific CD8+ T Cell Responses
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Area of Science:

  • Immunology
  • Gerontology
  • Cellular Biology

Background:

  • The adaptive immune system undergoes functional alterations with age, exhibiting both general and individual-specific changes.
  • T cell aging is characterized by a reduction in naive T cells, an accumulation of memory T cells, and a diminished T cell receptor (TCR) repertoire.

Purpose of the Study:

  • To investigate age-related changes in T cell subpopulations, transcriptomes, and TCR repertoires.
  • To differentiate general aging patterns from idiosyncratic alterations in T cell populations.

Main Methods:

  • Utilizing single-cell sequencing technologies to analyze T cell characteristics.
  • Examining transcriptome changes and TCR clonotypes in T cells across different ages.
  • Measuring individual cell age and identifying distinct T cell subpopulations.

Main Results:

  • Identification of novel T cell subpopulations associated with aging.
  • Characterization of age-dependent transcriptome alterations within T cells.
  • Analysis of changes in both overall and antigen-specific T cell receptor repertoires with aging.

Conclusions:

  • Aging induces significant, multifaceted changes in the T cell compartment.
  • Single-cell technologies offer unprecedented insights into the complexities of immune aging.
  • Understanding these T cell dynamics is crucial for addressing age-related immune dysfunction.