title: Microarray analysis reveals similarity between CD8+CD28- T cells from young and elderly persons, but not of CD8+CD28+ T cells.
abstract: We isolated highly purified CD8+CD28+ and CD8+CD28- T cell populations from healthy young and elderly persons for gene expression profiling using Affymetrix oligonucleotide microarrays. We demonstrate that the gene expression profile of CD8+CD28- T cells is very similar in young and elderly persons. In contrast, CD8+CD28+ in elderly differ from CD8+CD28+ in young persons. Hierarchical clustering revealed that CD8+CD28+ in elderly are located between CD8+CD28+ in young and CD8+CD28- (young and old) T cells regarding their differentiation state. Our study demonstrates a dichotomy of gene expression levels between CD8+CD28+ T cells in young and elderly persons but a similarity between CD8+CD28- T cells in young and elderly persons. As CD8+CD28+ T cells from elderly and young persons are distinct due to a different composition of the population, these results suggest that the gene expression profile does not depend on chronological age but depends on the differentiation state of the individual cell types.
authors.affiliation: Institute for Biomedical Aging Research of the Austrian Academy of Sciences, Rennweg 10, 6020, Innsbruck, Austria.
authors.forename: Lutfan
authors.initials: L
authors.lastname: Lazuardi
authors.forename: Dietmar
authors.initials: D
authors.lastname: Herndler-Brandstetter
authors.forename: Stefan
authors.initials: S
authors.lastname: Brunner
authors.forename: Gerhard T
authors.initials: GT
authors.lastname: Laschober
authors.forename: Günter
authors.initials: G
authors.lastname: Lepperdinger
authors.forename: Beatrix
authors.initials: B
authors.lastname: Grubeck-Loebenstein