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Valpha24+ NKT cells are decreased in elderly humans
Olga DelaRosa1, Raquel Tarazona, Javier G Casado
1Department of Immunology, Faculty of Medicine, Reina Sofia University Hospital, University of Cordoba, Avda. Menéndez Pidal s/n, 14004 Cordoba, Spain.
Experimental Gerontology
|January 5, 2002
Summary
Aging significantly reduces Natural Killer T (NKT) cells in elderly individuals, impacting immune function. This study reveals decreased NKT cell percentages and altered CD4/CD8 phenotypes in older adults.
Area of Science:
- Immunology
- Cell Biology
- Gerontology
Background:
- Natural Killer T (NKT) cells are a unique lymphocyte subset with immunoregulatory functions.
- Aging profoundly affects immune system responses, a phenomenon known as immunosenescence.
Purpose of the Study:
- To investigate the impact of aging on NKT cell populations in healthy elderly individuals.
- To characterize changes in NKT cell surface markers and phenotypes with age.
Main Methods:
- Flow cytometry was used to analyze peripheral blood mononuclear cells.
- Expression of CD3, Valpha24, CD28, CD4, and CD8 markers was quantified on NKT cells.
Main Results:
- Elderly donors exhibited a reduced percentage of CD3+Valpha24+ NKT cells compared to younger individuals.
- A majority of NKT cells in older adults expressed CD28, contrasting with age-associated decreases in mainstream T cells.
- An increased proportion of Valpha24+ cells with a CD4-CD8+ (cytotoxic) phenotype was observed in the elderly.
Conclusions:
- Aging leads to a decrease in NKT cell numbers and alterations in their phenotype, specifically an increase in CD4-CD8+ NKT cells.
- These age-related changes in NKT cells likely contribute to the compromised immune responses observed in the elderly.