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T cell receptor V-segment frequencies in peripheral CD8+ T cells in aging
B Esparza1, A Rodriguez, M Puente
1Department of Physiology, School of Medicine, Universidad del País Vasco, Bilbao, Spain.
Immunological Investigations
|September 8, 1998
Summary
Aging affects immune cells, specifically CD8+ T lymphocytes crucial for fighting viral infections. This study found no significant changes in T cell receptor V alpha and V beta usage in older adults compared to controls, except for the Vbeta6 subfamily.
Area of Science:
- Immunology
- Gerontology
- Cellular Biology
Background:
- Infections pose significant health risks to the elderly population.
- CD8+ T lymphocytes are vital for antiviral defense and exhibit subset variations.
- Cellular senescence is associated with alterations in the CD8+ T lymphocyte compartment, including a decrease in CD8+CD45RA+ cells.
Purpose of the Study:
- To investigate the T cell receptor (TCR) V alpha and V beta repertoire usage in aging subjects.
- To compare TCR specificity usage between elderly individuals and younger controls.
Main Methods:
- Utilized seven monoclonal antibodies targeting specific regions of the TCR.
- Analyzed peripheral blood CD8+ T lymphocytes from aging and control subjects.
- Quantified the frequency of T cells expressing selected V alpha and V beta epitopes.
Main Results:
- No significant differences were observed in the frequency of T cells bearing most selected V alpha and V beta epitopes between old and control subjects.
- An exception was noted in the Vbeta6 subfamily, where frequency differences may exist (further investigation implied).
Conclusions:
- Aging does not broadly alter the TCR V alpha and V beta repertoire usage in CD8+ T cells.
- The findings suggest a preserved TCR specificity repertoire in senescence, with potential specific subfamily variations warranting further study.