Immunosenescence Study of T Cells: A Systematic Review
| Autor: | Ivon Johanna Rodriguez, Nicolás Lalinde Ruiz, Manuela Llano León, Laura Martínez Enríquez, María del Pilar Montilla Velásquez, Juan Pablo Ortiz Aguirre, Oscar Mauricio Rodríguez Bohórquez, Esteban Alejandro Velandia Vargas, Edgar Debray Hernández, Carlos Alberto Parra López |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
immunosenescence
lcsh:Immunologic diseases. Allergy Naive T cell business.industry T cell flow cytometry Immunology T cells CD28 Immunosenescence Acquired immune system Stem cell marker cytokines medicine.anatomical_structure Immune system medicine Immunology and Allergy Systematic Review business lcsh:RC581-607 Memory T cell immunosenescence markers |
| Zdroj: | Frontiers in Immunology, Vol 11 (2021) Frontiers in Immunology |
| ISSN: | 1664-3224 |
| DOI: | 10.3389/fimmu.2020.604591/full |
| Popis: | BackgroundAging is accompanied by alterations in immune response which leads to increased susceptibility to infectious diseases, cancer, autoimmunity, and inflammatory disorders. This decline in immune function is termed as immunosenescence; however, the mechanisms are not fully elucidated. Experimental approaches of adaptive immunity, particularly for T cells, have been the main focus of immunosenescence research. This systematic review evaluates and discusses T cell markers implicated in immunosenescence.ObjectiveTo determine the best flow cytometry markers of circulating T cells associated with immunosenescence.MethodsWe systematically queried PubMed, MEDLINE, EBSCO, and BVS databases for original articles focused on two age groups of healthy humans: 18–44 (young adults) and >60 (older adults) years. In accordance with the Cochrane methodology, we synthesized data through qualitative descriptions and quantitative random effects meta-analysis due to extensive heterogeneity.ResultsA total of 36 studies conducted in the last 20 years were included for the qualitative analysis and four out of these studies were used to perform the meta-analysis. A significant decrease in naïve T cell subset was observed in older adults compared to young adults. Primary markers used to identify senescent cells were loss of CD28 and increased expression of CD57 and KLRG1 in terminally-differentiated memory T cell subset in older adults. Moreover, we observed an increase in proinflammatory cytokines and decrease in telomere length in old adult T cells. It was not possible to perform quantitative synthesis on cell markers, cytokines, and telomere length because of the significant variations between the groups, which is attributed to differences in protocols and unreported measurements, thus generating a high risk of bias.ConclusionsHeterogeneity among studies in terms of data report, measurement techniques and high risk of bias were major impediments for performing a robust statistical analysis that could aid the identification of eligible flow cytometry markers of immunosenescence phenotype in T cells. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|