ArrayExpress Uploader03913naivenaivenaivenaivehigh PD-1 expressionhigh PD-1 expressionhigh PD-1 expressionhigh PD-1 expressionhigh PD-1 expressionhigh PD-1 expressionlow PD-1 expressionlow PD-1 expressionlow PD-1 expressionlow PD-1 expressionlow PD-1 expressionlow PD-1 expressionarrayexpress_sid4T cell dysfunction is an important feature of many chronic viral infections. In particular, it was shown that PD-1 regulates T cell...21383243E-GEOD-26495/profile/8773/arrayexpressuploader116cellperipheralDec.12, 2014Falsetranscription-profiling-by-array-of-human-cd8-posiE-GEOD-26495_A-AFFY-44Transcription profiling by array of human CD8-positive T cells with high or low programmed death-1 expressionSep.15, 2014T cell dysfunction is an important feature of many chronic viral infections. In particular, it was shown that PD-1 regulates T cell dysfunction during chronic LCMV infection in mice and PD-1 high cells exhibit an intense exhausted gene signature. These findings were extended to human chronic infections such as HIV, HCV and HBV. However, it is not known if PD-1 high cells of healthy humans have the traits of exhausted cells. In this study, we provide a comprehensive description of phenotype, function and gene expression profiles of PD-1 high versus PD-1 low CD8 T cells in the peripheral blood of healthy human adults as following: 1) The percentage of naive and memory CD8 T cells varied widely in the peripheral blood cells of healthy humans and PD-1 was expressed by the memory CD8 T cells. 2) PD-1 high CD8 T cells in healthy humans did not significantly correlated with the PD-1 high exhausted gene signature of HIV specific human CD8 T cells or chronic LCMV specific CD8 T cells from mice. 3) PD-1 expression did not directly affect the ability of CD8 T cells to secrete cytokines in healthy adults. 4) PD-1 was expressed by the effector memory (TEM) compared to ‘terminally differentiated effector’ (TEMRA) CD8 T cells. 5) Finally, an interesting inverse relationship between CD45RA and PD-1 expression was observed. We used highly purified PD-1 high and PD-1 low from six healthy adult individuals and naive CD8 T cell populations from four of those individuals for gene expression studieshttp://www.ebi.ac.uk/arrayexpress/experiments/E-GEOD-26495humanhttp://www.ebi.ac.uk/arrayexpress/experiments/E-GEOD-26495/samples/