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T cells remaining after intensive chemotherapy for acute myelogenous leukemia show a broad cytokine release profile including high levels of interferon-γ that can be further increased by a novel protein kinase C agonist PEP005

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Abstract

Cytokines are released during T cell activation, including the potentially anti-leukemic interferon-γ (IFNγ), but also the hematopoietic growth factor granulocyte-macrophage colony-stimulating factor (GM-CSF) that enhance proliferation and inhibit apoptosis of acute myelogenous leukemia (AML) cells. In the present study we investigated the release of IFNγ and GM-CSF by circulating T cells in AML patients with chemotherapy-induced cytopenia. T cells were activated with anti-CD3 plus anti-CD28 in a whole-blood assay in the presence of their natural cytokine network. We examined 63 samples derived from 16 AML patients during 28 chemotherapy cycles. Activated T cells showed a broad cytokine release profile, but IFNγ and GM-CSF levels showed a significant correlation and were generally higher than the other cytokine levels. Higher IFNγ and GM-CSF responses were associated with a low CD4:CD8 ratio, older patient age and no ongoing chemotherapy indicating potential utility of T cell activation regimes for the older AML patient. The cytokine levels could be further increased by the novel protein kinase C agonist PEP005, which also induced significant production of IL2 and TNFα which could contribute to anti-tumor effects in AML patients. We conclude that remaining T cells after intensive AML therapy show a broad cytokine release profile including high and significantly correlated levels of potentially anti-leukemic IFNγ and the AML growth factor GM-CSF. The final outcome of an AML-initiated T cell cytokine response will thus depend on the functional characteristics of the AML cells, in particular the relative expression of IFNγ and GM-CSF receptors which differs between AML patients.

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Acknowledgments

The work was supported by the Norwegian Cancer Society and the European commission (LSHB-CT-2004–503467). The technical assistance of Kristin Paulsen and Aina Kvinnsland is gratefully acknowledged.

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Correspondence to Elisabeth Ersvær.

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Ersvær, E., Hampson, P., Hatfield, K. et al. T cells remaining after intensive chemotherapy for acute myelogenous leukemia show a broad cytokine release profile including high levels of interferon-γ that can be further increased by a novel protein kinase C agonist PEP005. Cancer Immunol Immunother 56, 913–925 (2007). https://doi.org/10.1007/s00262-006-0236-5

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  • DOI: https://doi.org/10.1007/s00262-006-0236-5

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