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Published on: April 16, 2012
Dysregulation between TH1 and TH2 T cell subpopulations in the elderly
I Cakman1, J Rohwer, R M Schütz
1Institute of Immunology and Transfusion Medicine, University of Lübeck School of Medicine, Germany.
Mechanisms of Ageing and Development
|June 25, 1996
Summary
Elderly individuals show zinc deficiency, impacting immune function with reduced interferon-gamma and altered T cell populations. Zinc replenishment did not improve T cell activity in this study.
Area of Science:
- Immunology
- Gerontology
- Nutritional Science
Background:
- Zinc is crucial for immune system function.
- Age-related changes can affect immune responses and nutritional status.
- Zinc deficiency is common in the elderly and may impact immunity.
Purpose of the Study:
- To investigate the influence of zinc and its binding proteins on the immune system in elderly and young subjects.
- To assess immune cell profiles and cytokine production in relation to zinc status in aging.
- To evaluate the effect of zinc reconstitution on T cell activity in the elderly.
Main Methods:
- Comparison of serum zinc, albumin, and alpha 2-macroglobulin levels between elderly and young cohorts.
- Whole blood assay to measure cytokine production (interferon-gamma, interleukin-10) and soluble interleukin-2 receptors.
- Flow cytometry analysis of lymphocyte subpopulations (CD8+, CD4+, CD45RA+, CD45RO+).
- Assessment of T cell activity post-zinc reconstitution.
Main Results:
- Elderly subjects exhibited lower serum zinc levels compared to young controls.
- Reduced production of interferon-gamma and soluble interleukin-2 receptors, with increased interleukin-10 in the elderly.
- Lower counts of CD8+, CD8+/CD45RA+, and CD4+/CD45RO+ cells were observed in the elderly.
- Zinc reconstitution did not lead to significant improvements in T cell activity.
Conclusions:
- Age-related zinc deficiency may contribute to immune dysregulation, specifically a shift from TH1 to TH2 cell responses.
- The observed alterations in lymphocyte subpopulations suggest impaired cellular immunity in the elderly.
- Zinc reconstitution may not be sufficient to reverse established immune deficits in aging individuals.
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