Abstract:
:Leukemia-associated antigens such as proteinase-3 (PR3) and Wilms' tumor protein-1 (WT-1) are potential targets of T-cell responses, which can be monitored by T-cell assays within vaccination trials and after allogeneic stem cell transplantation (SCT). In chronic myeloid leukemia (CML) an aberrant cytokine profile of antigen-specific T-cells with predominant TNF-α secretion has previously been described. The aim of this study was to investigate whether these TNF-α(+)/IFN-γ(-) CD8(+) T-cells can also be observed in AML patients after SCT. Eight HLA-A2(+) AML patients at different time points after SCT were evaluated for HLA-A2-restricted CD8(+) T-cell responses against PR3, WT-1 and influenza-A using pentamer staining and different cytokine-based T-cell assays. Antigen-specific T-cell immune responses against influenza-A and PR3 were observed in 4/8 patients, WT-1-specific T-cells could be detected in 3/8 patients. Interestingly, four different cytokine secretion profiles of antigen-specific T-cells were detected: (1) IFN-γ(+)/TNF-α(+), (2) IFN-γ(+)/TNF-α(-), (3) TNF-α(+)/IFN-γ(-) and (4) IFN-γ(-)/TNF-α(-). TNF-α(+)/IFN-γ(-) CD8(+) T-cells are an interesting biological phenomenon which can obviously be observed also in AML patients. This finding has important implications for both T-cell biology and monitoring within immunotherapy trials. The functional characterization of these TNF-α(+)/IFN-γ(-) CD8(+) T-cells needs further investigations.
journal_name
Hum Vaccin Immunotherjournal_title
Human vaccines & immunotherapeuticsauthors
Flörcken A,van Lessen A,Terwey TH,Dörken B,Arnold R,Pezzutto A,Westermann Jdoi
10.4161/hv.24250subject
Has Abstractpub_date
2013-06-01 00:00:00pages
1200-4issue
6eissn
2164-5515issn
2164-554Xpii
24250journal_volume
9pub_type
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