Analyzing the Effect of Aging on CD8+ T-Cell Phenotype Using Flow Cytometry
1Section of Rheumatology, Department of Internal Medicine, Yale School of Medicine, 300 Cedar Street, New Haven, CT, 06520, USA.
Methods in Molecular Biology (Clifton, N.J.)
|October 1, 2015
Summary
Aging significantly alters T-cell immunity, increasing memory CD8+ T cells while decreasing naïve T cells. This study details flow cytometry methods to measure these age-related changes in human CD8+ T-cell subsets.
Area of Science:
- Immunology
- Gerontology
- Cell Biology
Background:
- Immune system function declines with age, a process known as immunosenescence.
- A hallmark of immunosenescence is the altered composition of T-cell populations, specifically CD8+ T cells.
- Naïve T cells decrease while memory T cells increase, impacting adaptive immunity.
Purpose of the Study:
- To describe flow cytometry methods for quantifying age-associated changes in human CD8+ T-cell subsets.
- To provide a standardized approach for analyzing T-cell phenotypes in aging populations.
Main Methods:
- Utilized flow cytometry to analyze peripheral blood mononuclear cells (PBMCs).
- Focused on quantifying distinct subsets of CD8+ T cells based on surface markers.
- Compared T-cell subset distribution between younger and older adult cohorts.
Main Results:
- Observed a significant expansion of memory CD8+ T-cell populations in older individuals.
- Documented a corresponding decrease in naïve CD8+ T-cell numbers with advancing age.
- Highlighted the utility of flow cytometry in identifying these specific immunological shifts.
Conclusions:
- Flow cytometry provides a robust method for assessing age-related alterations in CD8+ T-cell populations.
- These changes reflect diminished T-cell regeneration and cumulative immune stimulation over a lifetime.
- Understanding these shifts is crucial for addressing age-related immune dysfunction.
