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Related Concept Videos

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...
The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
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...

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Related Experiment Video

Updated: May 24, 2026

Quantitative Imaging of Lineage-specific Toll-like Receptor-mediated Signaling in Monocytes and Dendritic Cells from Small Samples of Human Blood
07:58

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

Published on: April 16, 2012

Assessment of T-cell function in the aged.

I Beckman1

  • 1Department of Immunology, Fremantle Hospital, Fremantle, Perth, Western Australia.

Methods in Molecular Medicine
|February 22, 2012
PubMed
Summary

Immune function declines with age, particularly cell-mediated immunity. Studying specific T-cell types is crucial for understanding aging immune system changes, as broad analyses may miss key differences.

Area of Science:

  • Immunology
  • Gerontology
  • Cellular Biology

Background:

  • Immunological activity, especially cell-mediated immunity, diminishes with age.
  • Human T-cells consist of diverse functional and phenotypic subpopulations.
  • Analyzing unfractionated lymphocytes risks overlooking age-related changes in specific T-cell types.

Purpose of the Study:

  • To highlight the complexity of studying age-related immune decline.
  • To emphasize the need for analyzing distinct T-cell subpopulations.
  • To underscore the limitations of using unfractionated peripheral blood lymphocytes (PBLs) in aging research.

Main Methods:

  • Review of existing immunological studies on aging.
  • Discussion of T-cell heterogeneity.

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Assessment of the Immunomodulatory Properties of Human Mesenchymal Stem Cells (MSCs)
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Published on: December 24, 2015

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Last Updated: May 24, 2026

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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Published on: April 16, 2012

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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Assessment of the Immunomodulatory Properties of Human Mesenchymal Stem Cells (MSCs)
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Assessment of the Immunomodulatory Properties of Human Mesenchymal Stem Cells (MSCs)

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  • Analysis of potential pitfalls in lymphocyte proliferation assays.

    • Main Results:

    • Age-related declines in immunity are complex and multifactorial.
    • T-cell subpopulations exhibit varied responses to aging.
    • Broad T-cell analyses may obscure critical age-associated alterations.

    Conclusions:

    • Understanding age-related immune decline requires examining specific T-cell subsets.
    • Future research should focus on phenotypically and functionally distinct T-cell populations.
    • Methodological approaches must account for T-cell heterogeneity to accurately assess immune aging.