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Age-associated changes in mitochondrial parameters on peripheral human lymphocytes.

M Drouet1, F Lauthier, J P Charmes

  • 1Equipe Postulante Centre National de la Recherche Scientifique 118, Faculté de Médecine, Limoges, France. drouet@unilim.fr

Experimental Gerontology
|January 6, 2000
PubMed
Summary

Aging is associated with decreased mitochondrial function in lymphocytes, potentially impacting immune responses. This study found reduced respiratory chain activity and increased mitochondrial DNA deletions in older adults, suggesting nuclear DNA dysfunction contributes to immune senescence.

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Area of Science:

  • Immunology
  • Gerontology
  • Mitochondrial Biology

Background:

  • Mitochondria play a crucial role in cellular energy production and apoptosis.
  • Mitochondrial dysfunction and DNA mutations are implicated in aging and senescence.
  • Immune senescence, characterized by declining immune function with age, may involve mitochondrial alterations.

Purpose of the Study:

  • To investigate age-related changes in mitochondrial function in human peripheral lymphocytes.
  • To determine if mitochondrial DNA (mtDNA) deletions correlate with observed functional alterations.
  • To explore the implications of these findings for immune senescence.

Main Methods:

  • Comparative analysis of respiratory chain enzyme activities (Complex II+III, III, IV) in lymphocytes from young (average age 35.3 years) and old (average age 80.8 years) healthy volunteers.

Related Experiment Videos

  • Detection of large-scale mtDNA deletions, specifically the 4977-bp deletion, using large-fragment polymerase chain reaction.

    • Main Results:

    • A significant decrease in respiratory chain Complex II+III activity was observed in older adults compared to younger adults.
    • Complex III activity showed a nonsignificant trend towards decrease with aging.
    • Complex IV activity remained unchanged between the age groups.
    • Numerous mtDNA deletions were detected in lymphocytes from both age groups, with no significant difference noted.

    Conclusions:

    • Age-related decline in lymphocyte respiratory chain activity, particularly Complex II+III, is evident.
    • The widespread presence of mtDNA deletions suggests they may not be the primary driver of functional decline in lymphocytes with aging.
    • Nuclear DNA dysfunction is proposed as a potential cause for altered mitochondrial function, impacting immune responsiveness and T-cell apoptosis in aging individuals.