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Published in: Immunity & Ageing 1/2012

Open Access 01-12-2012 | Research

Immune correlates of aging in outdoor-housed captive rhesus macaques (Macaca mulatta)

Authors: Elizabeth S Didier, Chie Sugimoto, Lisa C Bowers, Imtiaz A Khan, Marcelo J Kuroda

Published in: Immunity & Ageing | Issue 1/2012

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Abstract

Background

Questions remain about whether inflammation is a cause, consequence, or coincidence of aging. The purpose of this study was to define baseline immunological characteristics from blood to develop a model in rhesus macaques that could be used to address the relationship between inflammation and aging. Hematology, flow cytometry, clinical chemistry, and multiplex cytokine/chemokine analyses were performed on a group of 101 outdoor-housed captive rhesus macaques ranging from 2 to 24 years of age, approximately equivalent to 8 to 77 years of age in humans.

Results

These results extend earlier reports correlating changes in lymphocyte subpopulations and cytokines/chemokines with increasing age. There were significant declines in numbers of white blood cells (WBC) overall, as well as lymphocytes, monocytes, and polymorphonuclear cells with increasing age. Among lymphocytes, there were no significant declines in NK cells and T cells, whereas B cell numbers exhibited significant declines with age. Within the T cell populations, there were significant declines in numbers of CD4+ naïve T cells and CD8+ naïve T cells. Conversely, numbers of CD4+CD8+ effector memory and CD8+effector memory T cells increased with age. New multiplex analyses revealed that concentrations of a panel of ten circulating cytokines/chemokines, IFNγ, IL1b, IL6, IL12, IL15, TNFα, MCP1, MIP1α, IL1ra, and IL4, each significantly correlated with age and also exhibited concordant pairwise correlations with every other factor within this group. To also control for outlier values, mean rank values of each of these cytokine concentrations in relation to age of each animal and these also correlated with age.

Conclusions

A panel of ten cytokines/chemokines were identified that correlated with aging and also with each other. This will permit selection of animals exhibiting relatively higher and lower inflammation status as a model to test mechanisms of inflammation status in aging with susceptibility to infections and vaccine efficacy.
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Metadata
Title
Immune correlates of aging in outdoor-housed captive rhesus macaques (Macaca mulatta)
Authors
Elizabeth S Didier
Chie Sugimoto
Lisa C Bowers
Imtiaz A Khan
Marcelo J Kuroda
Publication date
01-12-2012
Publisher
BioMed Central
Published in
Immunity & Ageing / Issue 1/2012
Electronic ISSN: 1742-4933
DOI
https://doi.org/10.1186/1742-4933-9-25

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