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Related Experiment Videos

Human immunosenescence: does it have an infectious component?

G Pawelec1, S Koch, C Franceschi

  • 1University of Tübingen Medical School, Center for Medical Research, ZMF, Germany. graham.pawelec@uni-tuebingen.de

Annals of the New York Academy of Sciences
|June 29, 2006
PubMed
Summary

Cytomegalovirus (CMV) infection, not just aging, drives immune system decline in the elderly. This CMV-driven immunosenescence increases susceptibility to infections and impacts longevity.

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Area of Science:

  • Immunology
  • Gerontology
  • Infectious Diseases

Background:

  • Mortality from cardiovascular disease and cancer accelerates with age but plateaus around 75-80 years.
  • Mortality from infectious diseases accelerates indefinitely with age, with the elderly being highly susceptible to novel and known pathogens.
  • Elderly individuals often exhibit oligoclonal T cell expansions, particularly CD8 cells, linked to cytomegalovirus (CMV) seropositivity and immune aging biomarkers.

Purpose of the Study:

  • To investigate the role of cytomegalovirus (CMV) in immune system aging and its impact on the elderly.
  • To determine if CMV, rather than chronological age, is the primary driver of T cell alterations in older adults.
  • To understand the implications of CMV-host immune interactions on adaptive immunity and human longevity.

Main Methods:

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  • The study focuses on analyzing the relationship between T cell populations (specifically CD8 cells), CMV seropositivity, and immune system aging markers in the elderly.
  • Observational analysis of immune phenotypes and functions in relation to CMV status and age.
  • Literature review and synthesis of existing data on immunosenescence and infectious disease mortality.

Main Results:

  • Oligoclonal expansions of T cells, especially CD8 cells, in the elderly are surprisingly associated with cytomegalovirus (CMV) seropositivity.
  • CMV seropositivity correlates with phenotypic and functional alterations in T cell immunity, mirroring biomarkers of immune system aging.
  • The interaction between CMV and the host immune system critically influences the 'age' of adaptive immunity.

Conclusions:

  • Cytomegalovirus (CMV) is proposed as the primary driver, rather than age itself, for many T cell alterations observed in the elderly.
  • Immunosenescence, the aging of the immune system, may be significantly influenced or even caused by infectious agents like CMV.
  • Understanding CMV-host interactions is crucial for determining adaptive immunity's age and influencing human longevity.