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Immunosenescence – Aging of the Immune System

Immunosenescence refers to the age-related decline and restructuring of the immune system, leading to reduced immune defenses and increased susceptibility to infections, cancer, and autoimmune diseases.

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Things worth knowing about "Immunosenescence"

Immunosenescence refers to the age-related decline and restructuring of the immune system, leading to reduced immune defenses and increased susceptibility to infections, cancer, and autoimmune diseases.

What is Immunosenescence?

Immunosenescence describes the gradual deterioration of the immune system associated with aging. As people grow older, the immune system becomes less efficient at recognizing and responding to new pathogens, producing protective antibodies, and monitoring the body for abnormal cells. The term derives from the Latin senescere (to grow old) and encompasses both quantitative and qualitative changes in immune cells and their functions.

Causes and Biological Mechanisms

Immunosenescence is driven by several interrelated biological processes:

Thymic involution: The thymus, a central organ responsible for T-cell maturation, begins to shrink from early adulthood onward. This reduces the output of naive T-cells needed to respond to previously unseen antigens.
Accumulation of memory cells: Over a lifetime of antigen exposure, the immune repertoire becomes increasingly dominated by antigen-specific memory cells, limiting the capacity to mount responses against new threats.
Chronic low-grade inflammation (Inflammaging): Older adults often exhibit a persistent state of mild systemic inflammation, termed inflammaging, which impairs immune regulation and contributes to tissue damage.
Altered hematopoietic stem cell function: With age, blood-forming stem cells preferentially generate myeloid rather than lymphoid progenitor cells, skewing the composition of the immune system.
Oxidative stress and DNA damage: Accumulation of oxidative damage in immune cells impairs their function, replication, and longevity.

Effects on the Immune System

Innate Immune System

The innate immune system is also affected by immunosenescence. Natural killer (NK) cells show reduced cytotoxic activity, dendritic cells respond less effectively to pathogens, and macrophages display altered cytokine secretion patterns.

Adaptive Immune System

Changes in the adaptive immune system are particularly pronounced. The pool of naive T- and B-lymphocytes shrinks considerably, while differentiated memory cells accumulate. This shift weakens the response to new vaccines and previously unencountered pathogens.

Clinical Consequences

The clinical implications of immunosenescence are significant and wide-ranging:

Increased susceptibility to infectious diseases such as influenza, pneumonia, and COVID-19
Reduced effectiveness of vaccines in older populations
Higher risk of cancer due to impaired immune surveillance
Greater incidence of autoimmune reactions resulting from impaired self/non-self discrimination
Delayed wound healing and prolonged recovery times

Diagnosis and Measurement

No single biomarker fully captures immunosenescence. Researchers use a combination of parameters, including the ratio of CD4 to CD8 T-cells, the proportion of naive versus memory lymphocytes, telomere length in immune cells, and levels of inflammatory markers such as interleukin-6 (IL-6) and C-reactive protein (CRP).

Prevention and Therapeutic Approaches

Research into slowing or reversing immunosenescence is an active and promising field. Current strategies include:

Physical activity: Regular moderate exercise has been shown to have beneficial effects on immune function in older adults.
Nutrition: A balanced diet rich in antioxidants, omega-3 fatty acids, zinc, and vitamin D can support immune health.
Senolytics: Compounds designed to selectively eliminate senescent cells are being investigated in clinical trials.
Thymic regeneration: Experimental therapies aim to rejuvenate thymic function and restore T-cell production.
Optimized vaccination strategies: Adapted vaccination schedules and novel adjuvants are being developed to improve immune responses in older individuals.

References

Pawelec, G. (2018). Age and immunity: What is immunosenescence? Experimental Gerontology, 105, 4–9. https://doi.org/10.1016/j.exger.2017.10.008
Fulop, T. et al. (2017). Immunosenescence and inflammaging as two sides of the same coin: Friends or Foes? Frontiers in Immunology, 8, 1960. https://doi.org/10.3389/fimmu.2017.01960
World Health Organization (WHO) (2021). Decade of Healthy Ageing: Baseline Report. Geneva: WHO Press.

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