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Updated: Jun 27, 2026

Quantitative Imaging of Lineage-specific Toll-like Receptor-mediated Signaling in Monocytes and Dendritic Cells from Small Samples of Human Blood
Published on: April 16, 2012
Variation rhythms of lymphocyte subsets during healthy aging
Ana Maria Caetano Faria1, Sara Monteiro de Moraes, Ludmila Helene Ferreira de Freitas
1Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil. afaria@icb.ufmg.br
Aging alters immune cells in Brazilians, showing complex, rhythmic changes rather than a simple decline. This study provides reference ranges for healthy individuals across their lifespan, aiding future immune health interventions.
Area of Science:
- Immunology
- Gerontology
- Human Biology
Background:
- Immunosenescence involves complex immune system remodeling, not just decline.
- Most aging immunology data is from Caucasian populations in Europe/US.
- Limited data exists on Brazilian immune system changes with age.
Purpose of the Study:
- To determine lymphocyte subset frequencies in healthy Brazilians across a lifespan.
- To characterize age-related immune system changes in a diverse population.
- To establish reference ranges for Brazilian immune cell populations.
Main Methods:
- Analysis of major lymphocyte subsets in healthy Brazilian individuals (0-86 years).
- Sampling from two distinct geographic regions (Southeast and South).
- Longitudinal and cross-sectional age interval analysis.
Main Results:
- Aging significantly alters innate and adaptive immunity cell frequencies in Brazilians.
- Immune cell changes exhibit oscillatory/rhythmic patterns, not steady decline.
- Abrupt immune cell frequency shifts observed in individuals over 75 years old.
Conclusions:
- Immune system remodeling with age is complex and population-specific.
- Rhythmic immune cell changes highlight dynamic aging processes.
- Reference ranges are crucial for understanding immune function and developing interventions for the elderly.
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