期刊
PLOS ONE
卷 3, 期 8, 页码 -出版社
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0002905
关键词
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资金
- GSK Biologicals
- Medical Research Council
- Fonds National de la Recherche Scientifique, Belgium
- MRC [MC_U190081978, MC_U190085854] Funding Source: UKRI
- Medical Research Council [MC_U190085854, MC_U190081978] Funding Source: researchfish
Background: In a previously published study, we found that large differentiated subpopulations of CD8 T-cells emerged rapidly after CMV infection in young infants and persisted throughout the following year. Here we describe a follow-up study conducted on the same infants to establish whether the differentiated subpopulations continued through the second year post-infection. Methodology/Principal Findings: CMV-specific cells identified using tetramers remained more activated and differentiated than the overall CD8 population. The large subpopulation of differentiated cytotoxic (CD28(-)CD62L(-)Bcl-2(low)CD95(+)perforin(+)) cells that emerged rapidly after infection remained stable after two years. No similar subpopulation was found in CMV-uninfected infants indicating that two years after infection, CMV remained a major factor in driving CD8 T-cell differentiation. Although markers of activation (CD45R0 and HLA-D) declined throughout the first year, HLA-D expression continued to decline during the second year and CD45R0 expression increased slightly. The age-related increase in IFN gamma response observed during the first year continued but was non-significant during the second year, indicating that the rate of functional improvement had slowed substantially. Conclusions/Significance: The large differentiated subpopulations of CD8 T-cells that had emerged immediately after CMV infection persisted through the second year post-infection, while levels of activation and functional capacity remained fairly constant.
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