Immunosenescence in the nursing home elderly
Jennie Johnstone1, Jamie Millar, Alina Lelic
1Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, ON L8S 4 K1, Canada. johnsj48@mcmaster.ca.
BMC Geriatrics
|April 19, 2014
Summary
Nursing home elderly show altered T-cell and NK cell phenotypes, including fewer naive CD8+ T-cells and more regulatory T-cells (T-regs). These changes in immune cell populations highlight aging-related immune shifts in long-term care residents.
Area of Science:
- Immunology
- Gerontology
- Cellular Biology
Background:
- Investigating T-cell and natural killer (NK) cell phenotypes in elderly individuals residing in nursing homes is crucial for understanding age-related immune system changes.
- The immune system undergoes significant alterations with aging, impacting susceptibility to infections and vaccine efficacy.
Purpose of the Study:
- To characterize and compare the phenotypes of T-cells and NK cells in elderly individuals living in nursing homes versus healthy younger adults.
- To identify specific immune cell subset differences that may be associated with institutionalized elderly populations.
Main Methods:
- Recruitment of nursing home elderly (≥65 years) and healthy adults (18-64 years) from Hamilton, Ontario, and McMaster University.
- Exclusion of nursing home residents on immunosuppressive medications.
- Flow cytometry analysis to compare percentages of CD8+ T-cells, CD4+ T-cells, regulatory T-cells (T-regs), and NK cell subsets between groups.
Main Results:
- Nursing home elderly (median age 87) exhibited fewer naive CD8+ T-cells, more terminally differentiated and senescent CD8+ T-cells compared to healthy adults (median age 31).
- Higher percentages of CD4+ T-cells and a greater CD4+/CD8+ ratio were observed in nursing home residents.
- Elevated levels of regulatory T-cells (T-regs) and mature natural killer (NK) cells were found in the nursing home elderly group.
Conclusions:
- The observed differences in T-cell subsets (naïve, terminally differentiated, senescent) and NK cell subsets in nursing home elderly align with findings in community-dwelling elderly, suggesting common aging immune patterns.
- A notably higher CD4+/CD8+ ratio in nursing home elderly compared to healthy controls warrants further investigation into its clinical implications.
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