Tobacco exposure, but not aging, shifts the frequency of peripheral blood B cell subpopulations

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Tipo de produção
article
Data de publicação
2024
DOI
Scopus
Web of Science
PubMed
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ISSN da Revista
Título do Volume
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SPRINGER
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Citação
GEROSCIENCE, v.46, n.2, Special Issue, p.2729-2738, 2024
Projetos de Pesquisa
Unidades Organizacionais
Fascículo
Resumo
Several disturbances in T-cell mediated immunity have been described during aging, but immunosenescence of the B-cell compartment is less well elucidated. The peripheral blood B-cell compartment (CD19+) can be split into six main subpopulations according to the cell surface markers IgD, CD27, CD24, and CD38: Transitional, naive, unswitched, switched, double negative and plasmablasts. We thus aimed to verify whether shifts in these subsets occur during healthy and pathological aging. We recruited three groups of aged people (> 60 years old), healthy, COPD patients, and smokers without altered pulmonary function test, and a fourth group of individuals 18-40 years old (youngs). Total B-cells percentage and absolute number were similar among the healthy aged, COPD patients, and youngs, but the smokers showed significantly higher absolute numbers. While all six B-cell subset percentages were comparable among the healthy aged, COPD patients, and youngs, smokers showed significantly higher percentages of switched B-cells and reduced naive B-cells than the other three groups, resulting in an inverted naive:switched ratio. Analysis of the cell subset absolute numbers showed a similar trend. Overall, our results suggest that aging drives milder alterations in the distribution of peripheral blood B-cell subpopulations than in the T-cell compartment. We suggest that it is the T-cell immunosenescence that most contributes to the poor humoral immune responses in the elderly, vaccine responses included. Surprisingly it was the smokers who showed significant alterations when compared with the youngs, healthy aged, and aged COPD patients, probably as a result of the chronic immune stimulation described in active smoking subjects.
Palavras-chave
B cells, Humoral response, Lymphocytes aging, B-cell subsets
URI
https://observatorio.fm.usp.br/handle/OPI/59034
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Coleções
Artigos e Materiais de Revistas Científicas - FM/MPT