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The immune system in the elderly: II. Specific cellular immunity.
L Ginaldi1, M De Martinis, A D'Ostilio
1Department of Internal Medicine and Public Health, University of L'Aquila, Italy. ginaldil@sgol.it
Immunologic Research
|December 2, 1999
Summary
Aging significantly impacts the immune system, particularly T cell responses, leading to reduced immune function in older adults. This age-related decline, known as immunosenescence, increases susceptibility to infections and cancer.
Area of Science:
- Immunology
- Gerontology
- Cellular Biology
Background:
- Immune system function declines with age, increasing elderly susceptibility to infections and cancer.
- T cell alterations are a primary driver of reduced immune responsiveness in the elderly.
Purpose of the Study:
- To review age-related changes in the T cell compartment (immunosenescence).
- To discuss the mechanisms and clinical implications of these T cell dysregulations.
Main Methods:
- Analysis of existing literature on T cell phenotype and function in aging.
- Examination of changes in T cell receptor signaling and cytokine production.
Main Results:
- Aging leads to decreased naive T cells and increased activated/memory T cells.
- Aged T cells show reduced responsiveness to stimulation, impaired proliferation, and lower IL-2 production/receptor expression.
- Early signal transduction events and intracellular phosphorylation are diminished in aged T cells.
Conclusions:
- Immunosenescence is characterized by significant alterations in T cell phenotype and function.
- These T cell changes contribute to diminished immune surveillance and increased disease risk in the elderly.
- Understanding these mechanisms is crucial for addressing age-related immune dysfunction.