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Replicative Cell Senescence02:15

Replicative Cell Senescence

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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
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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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The Effect of Aging on Tissues01:19

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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...
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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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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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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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Techniques to Induce and Quantify Cellular Senescence
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Techniques to Induce and Quantify Cellular Senescence

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T cells, aging and senescence.

Luca Pangrazzi1, Birgit Weinberger1

  • 1Institute for Biomedical Aging Research, Universität Innsbruck, Innsbruck, Austria.

Experimental Gerontology
|February 25, 2020
PubMed
Summary

Aging impairs T cell production and diversity, leading to increased infections and reduced vaccine effectiveness in older adults. Defining senescent T cells is crucial for understanding and potentially treating age-related immune decline.

Area of Science:

  • Immunology
  • Gerontology
  • Cellular Senescence

Background:

  • Aging significantly alters the T cell compartment, impacting immune responses in older adults.
  • Reduced naive T cell production and accumulation of differentiated T cells diminish the T cell receptor repertoire.
  • Age-associated T cell changes share similarities with cellular senescence, including shorter telomeres and DNA damage.

Purpose of the Study:

  • To explore the characteristic changes in the T cell compartment with aging.
  • To discuss the implications of these changes for infections and vaccine efficacy in the elderly.
  • To address the challenges in defining senescent T cells and their potential role in immune function.

Main Methods:

  • Review of age-associated changes in T cell production, differentiation, and phenotype.
Keywords:
AgingSenescenceT cells

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  • Analysis of similarities between aged T cells and senescent cells.
  • Discussion of the role of Cytomegalovirus infection in exacerbating age-related T cell alterations.

    • Main Results:

    • Impaired naive T cell generation due to bone marrow and thymus involution.
    • Accumulation of antigen-experienced, differentiated T cells with a contracted T cell receptor repertoire.
    • CD28- T cells exhibit some senescent features but retain proliferative capacity, indicating a lack of consensus definition for senescent T cells.

    Conclusions:

    • Age-related T cell alterations contribute to increased susceptibility to infections and reduced vaccine responses in older individuals.
    • A clear definition of senescent T cells is needed to understand their functional impact and potential therapeutic targeting.
    • Senescent-like T cells may impair the clearance of other senescent cells, highlighting the importance of defining and targeting them.