CD45RA, CD8ß, and IFNγ Are Potential Immune Biomarkers of Human Cognitive Function.
Front Immunol
; 11: 592656, 2020.
Article
em En
| MEDLINE
| ID: mdl-33324408
ABSTRACT
There is increasing evidence that in humans the adaptive immunological system can influence cognitive functions of the brain. We have undertaken a comprehensive immunological analysis of lymphocyte and monocyte populations as well as of HLA molecules expression in a cohort of elderly volunteers (age range, 64-101) differing in their cognitive status. Hereby, we report on the identification of a novel signature in cognitively impaired elderly characterized by (1) elevated percentages of CD8+ T effector-memory cells expressing high levels of the CD45RA phosphate receptor (Temra hi); (2) high percentages of CD8+ T cells expressing high levels of the CD8ß chain (CD8ßhi); (3) augmented production of IFNγ by in vitro activated CD4+ T cells. Noteworthy, CD3+CD8+ Temra hi and CD3+CD8ßhi cells were associated with impaired cognition. Cytomegalovirus seroprevalence showed that all volunteers studied but one were CMV positive. Finally, we show that some of these phenotypic and functional features are associated with an increased frequency of the HLA-B8 serotype, which belongs to the ancestral haplotype HLA-A1, Cw7, B8, DR3, DQ2, among cognitively impaired volunteers. To our knowledge, this is the first proof in humans linking the amount of cell surface CD45RA and CD8ß chain expressed by CD8+ Temra cells, and the amount of IFNγ produced by in vitro activated CD4+ T cells, with impaired cognitive function in the elderly.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Biomarcadores
/
Interferon gama
/
Antígenos CD8
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Antígenos Comuns de Leucócito
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Cognição
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Linfócitos T CD8-Positivos
Tipo de estudo:
Etiology_studies
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Prevalence_studies
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Risk_factors_studies
Limite:
Humans
Idioma:
En
Revista:
Front Immunol
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Portugal