Reference values for CD4+ and CD8+ T lymphocytes with naïve or memory phenotype and their association with mortality in the elderly.
Gerontology
; 55(3): 314-21, 2009.
Article
en En
| MEDLINE
| ID: mdl-19190395
ABSTRACT
BACKGROUND:
Well-established reference values which take into account the influence of age on immune cell phenotype, and the impact of naïve or memory T cells on mortality have not been well defined in the elderly.OBJECTIVE:
The aim of this study was to evaluate the reference values for the peripheral number of total and naïve or memory CD4 and CD8 T cells in a healthy population in Italy, and to analyze whether the immune phenotype was associated with an increased risk of death among older adults.METHODS:
The number of total or naïve and memory CD4+ or CD8+ T cells was evaluated in the peripheral blood of 288 healthy people ranging in age from 20 to 107 years. Furthermore, to correlate peripheral immune phenotype with mortality rate after a 3-years follow-up, a retrospective analysis was performed on the results from those individuals aged >65 years at the time of the enrollment in the study.RESULTS:
The absolute number of total and naïve T cells was progressively reduced with increasing age in both the CD4+ and CD8+ T cell populations. The decrease was particularly evident for cells with naïve phenotype, since CD4-naïve and CD8-naïve T cells respectively showed a 4- and a 2- to 3-fold reduction in 70- to >90-year-old subjects in comparison with young adults. The number of CD4 memory T cells significantly increased with age. No significant age-related change was observed in the number of CD8+ memory T cells. Of the 194 subjects included in the study of association of immune phenotype with mortality, 121 were alive and 73 deceased during the 3-year follow-up. The impact of immune parameters on survival demonstrated that only the absolute number of CD8 memory T cells, after adjustment for age, correlated with increased mortality (OR 1.007, 95% CI 1.002-1.012, p = 0.01). The correlation was significant in female but not in male subjects.CONCLUSION:
We provide reference values for total and naïve or memory CD4 and CD8 T cell populations, and demonstrate that the absolute number of CD8 memory T cells, after adjustment for age, correlates with increased mortality.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Envejecimiento
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Linfocitos T CD4-Positivos
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Mortalidad
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Inmunofenotipificación
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Linfocitos T CD8-positivos
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Memoria Inmunológica
Tipo de estudio:
Etiology_studies
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Observational_studies
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Prognostic_studies
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Risk_factors_studies
Límite:
Adult
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Aged
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Aged80
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Female
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Humans
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Male
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Middle aged
País/Región como asunto:
Europa
Idioma:
En
Revista:
Gerontology
Año:
2009
Tipo del documento:
Article
País de afiliación:
Italia