Evaluation of lymphocyte levels in a random sample of 218 elderly individuals from São Paulo city

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dc.contributor.authorTeixeira, Daniela [UNIFESP]
dc.contributor.authorLongo-Maugéri, Ieda Maria [UNIFESP]
dc.contributor.authorSantos, Jair Licio Ferreira
dc.contributor.authorDuarte, Yeda Aparecida Oliveira
dc.contributor.authorLebrão, Maria Lucia
dc.contributor.authorBueno, Valquiria [UNIFESP]
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2015-06-14T13:43:19Z
dc.date.available2015-06-14T13:43:19Z
dc.date.issued2011-10-01
dc.description.abstractBACKGROUND: Age-associated changes in the immune system cause decreased protection after vaccination and increased rates of infections and tumor development. METHODS: Lymphocyte percentages were compared by gender and age to establish differences between subtypes. Three mL blood samples were obtained from 218 randomly selected individuals (60-101 years old) who live in São Paulo city. Blood was lysed with Tris phosphate buffer and stained for 30 minutes with monoclonal antibodies (CD3PerCP, CD4FITC, CD8Pe, CD19Pe) for analysis by flow cytometry. Statistical analysis was by ANOVA. RESULTS: The percentage of CD4+ T cells (p-value = 0.005) and the CD4/CD8 ratio (p-value = 0.010) were lower in men, whereas the percentage of CD8+ T cells was lower (p-value = 0.002) in women; the percentage of B cells (CD19+ ) was similar between groups. Individuals grouped by gender and age range and compared showed a drop in CD4+ cells in 75 to 79-year-old men (female: 46.1% ± 8.1% and male: 38.8% ± 10.5%; p-value = 0.023). Also, the 80 to 84-year-old group of men had a higher percentage of CD8+ (female: 20.8% ± 8.2%, and male: 27.2% ± 8.2%; p-value = 0.032). Low percentages of B cells were detected in men in the 75 to 79-year-old (p-value = 0.003), 85 to 89-year-old (p-value = 0.020) and older than 90 year old (p-value = 0.002) age ranges. CONCLUSION: Elderly men present with more changes in lymphocyte subsets compared to elderly women. These findings could demonstrate impairment in the immune response since the lower CD4+ in men would provide less help to B cells (also lower in men) in terms of antibody production. In addition, the increase in CD8+ cells in this group could represent chronic inflammation observed during the aging process.en
dc.description.affiliationUniversidade Federal de São Paulo (UNIFESP) Immunology Department
dc.description.affiliationUniversidade de São Paulo Faculdade de Medicina de Ribeirão Preto
dc.description.affiliationUniversidade de São Paulo Escola de Saúde Pública
dc.description.affiliationUniversidade Federal de São Paulo (UNIFESP) Biosciences Department
dc.description.affiliationUnifespUNIFESP, Immunology Department
dc.description.affiliationUnifespUNIFESP, Biosciences Department
dc.description.sourceSciELO
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent367-371
dc.identifierhttp://dx.doi.org/10.5581/1516-8484.20110100
dc.identifier.citationRevista Brasileira de Hematologia e Hemoterapia. Associação Brasileira de Hematologia e Hemoterapia e Terapia Celular, v. 33, n. 5, p. 367-371, 2011.
dc.identifier.doi10.5581/1516-8484.20110100
dc.identifier.fileS1516-84842011000500013.pdf
dc.identifier.issn1516-8484
dc.identifier.scieloS1516-84842011000500013
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/6672
dc.language.isoeng
dc.publisherAssociação Brasileira de Hematologia e Hemoterapia e Terapia Celular
dc.relation.ispartofRevista Brasileira de Hematologia e Hemoterapia
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectAgingen
dc.subjectSex distributionen
dc.subjectImmune Systemen
dc.subjectLymphocytesen
dc.subjectFlow Cytometryen
dc.titleEvaluation of lymphocyte levels in a random sample of 218 elderly individuals from São Paulo cityen
dc.typeinfo:eu-repo/semantics/article
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