Cited by 137Telomeres, Telomerase, and SenescenceGenetics, Aging, and Longevity in Model OrganismsCytomegalovirus and herpesvirus research

Telomere/telomerase dynamics within the human immune system: Effect of chronic infection and stress

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Effros, Rita B.·2011·Experimental Gerontology

Abstract

Aging of the immune system is a major factor responsible for the increased severity of infections, reduced responses to vaccines, and higher cancer incidence in the elderly. A major category of stressors that contribute to the alterations within the T lymphocyte compartment is the family of herpes viruses. These viruses, usually acquired early in life, persist for many decades and drive certain T cells to the end stage of replicative senescence, which is characterized by a variety of phenotypic and functional changes, including altered cytokine profile, resistance to apoptosis, and shortened telomeres. Indeed, high proportions of senescent CD8 (cytotoxic) T lymphocytess are associated with latent cytomegalovirus (CMV) infection in the elderly, and are part of a cluster of immune biomarkers that are associated with early mortality. Similar cells accumulate at younger ages in persons chronically infected with HIV-1. In addition to persistent viral infection, psychological stress as well as oxidative stress can also contribute to the generation of senescent dysfunctional T lymphocytes. Strategies such as cell culture manipulation of replicative senescence, as well as lifestyle and stress reduction techniques are discussed in terms of possible approaches to enhance immune function in older persons. This review highlights the importance of using humans in studies on immunosenescence and telomere/telomerase dynamics, since model organisms employed in other facets of aging research are not subject to the particular factors that cause the striking age-related reconfiguration of the human immune system.

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  1. Lin J Epel E Cheon J Kroenke C Sinclair E Bigos M Analyses and comparisons of telomerase activity and telomere length in human T and B cells: Insights for epidemiology of telomere maintenance J.Immunol.Methods 2009b PMC3280689 19837074

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Authors
Effros, R. B.
Affiliations
University of California, Los Angeles (US)
Corresponding author
Effros, Rita B.
Venue
Experimental Gerontology
Publisher
Elsevier BV
Published
2011-02
Volume
46
Issue
2-3
Pages
135-140
ISSN
0531-5565 (ISSN-L)
OpenAlex
W2070439612
Cited by
137
References
61
Citations by year
2026: 2 · 2025: 3 · 2024: 3 · 2023: 7 · 2022: 1 · 2021: 9 · 2020: 7 · 2019: 9 · 2018: 9 · 2017: 12 · 2016: 13 · 2015: 8 · 2014: 13 · 2013: 16 · 2012: 14
FWCI
1.32
Type
journal article
Language
en
Open access
Locations
  • Experimental Gerontology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute on Aging (R01AG023720, AG 023720)
  • National Institute of Allergy and Infectious Diseases (R01AI060362, AI 060362)
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
  • Health Sciences › Medicine › Epidemiology › Cytomegalovirus and herpesvirus research
Keywords
immunosenescence, telomeres, telomerase, replicative senescence, T cells, cytomegalovirus, HIV-1, chronic viral infection, psychological stress, oxidative stress, CD8+ T cells, aging, stress reduction
MeSH terms
Aging, Humans, Immune System, T-Lymphocytes, Virus Diseases, Telomere, Virus Latency, Telomerase, Cell Proliferation

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