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The immune system and aging: a review.

Camil Castelo-Branco1, Iris Soveral

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Aging impairs immune responses, increasing disease risk. This review summarizes how the aging immune system (immunosenescence) changes and impacts health, noting variations in healthy aging.

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Area of Science:

  • Immunology
  • Gerontology

Background:

  • Immunosenescence describes age-related declines in immune function, impacting both innate and adaptive immunity.
  • These changes lead to increased susceptibility to infections, reduced vaccine efficacy, and higher risks of cancer and chronic diseases.
  • A chronic low-grade inflammatory state (inflammaging) is common in aging and linked to age-related diseases.

Purpose of the Study:

  • To review current knowledge on age-related changes in the immune system.
  • To discuss the impact of immunosenescence on health and disease.
  • To explore factors contributing to healthy aging despite immune system alterations.

Main Methods:

  • This is a review article, synthesizing existing research on immunosenescence.
  • It examines cellular and serological changes in the immune system with age.
  • The review discusses the implications of these changes for various age-related conditions.

Main Results:

  • Immune responses, particularly adaptive immunity, decline with age.
  • Aging is associated with increased inflammation and susceptibility to diseases.
  • Healthy aging may involve mitigated immune dysfunction, influenced by unknown genetic and environmental factors.

Conclusions:

  • Immunosenescence is a significant factor in age-related health decline.
  • Understanding immune system aging is crucial for addressing age-related diseases.
  • Further research is needed to elucidate mechanisms of healthy aging and potential interventions.