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Reciprocal granzyme/perforin-mediated death of human regulatory and responder T cells is regulated by interleukin-2 (IL-2)

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Abstract

Human CD4+CD25highFOXP3+ T regulatory cells (Treg) can suppress responder T cell (RC) functions by various mechanisms. In co-cultures of Treg and autologous activated RC, both cell subsets up-regulate the expression of granzymes and perforin, which might contribute to Treg-mediated suppression. Here, we investigate the sensitivity and resistance of Treg and RC to granzyme/perforin-mediated death. CD4+CD25neg RC were single cell-sorted from the peripheral blood of 25 cancer patients and 15 normal controls. These RC were carboxyfluorescein diacetate succinimidyl ester (CFSE) labeled and co-cultured with autologous CD4+CD25highFOXP3+ Treg ± 150 or ±1,000 IU/mL of interleukin-2 (IL-2) to evaluate suppression of RC proliferation. In addition, survival of the cells co-cultured for 24 h and 5 days was measured using a flow-based cytotoxicity assay. Freshly isolated Treg and RC expressed granzyme A (GrA), granzyme B (GrB), and perforin. Percentages of positive cells were higher in cancer patients than controls (p < 0.01) and increased upon OKT3 and IL-2 stimulation. Treg, co-cultured with RC at 150 IU/mL of IL-2, no longer expressed cytotoxins and became susceptible to RC-mediated, granzyme/perforin-dependent death. However, in co-cultures with 1,000 IU/mL of IL-2, Treg became resistant to apoptosis and induced GrB-dependent, perforin-independent death of RC. When the GrB inhibitor I or GrB-specific and GrA-specific small inhibitory ribonucleic acids were used to block the granzyme pathway in Treg, RC death, and Treg-mediated suppression of RC, proliferation were significantly inhibited. Human CD4+CD25high Treg and CD4+CD25neg RC reciprocally regulate death/growth arrest by differentially utilizing the granzyme–perforin pathway depending on IL-2 concentrations.

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Acknowledgements

Supported in part by National Institutes of Health (NIH) grants PO1 CA109688, PO1 DE12321 and RO1 DE13918 to TLW. Dr. Bergmann was supported in part by Philip Morris USA, Inc. and Philip Morris International.

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All authors have read the manuscript and concur with its content. The authors do not have any financial/commercial conflict of interest that could be considered to have influenced the content of this paper.

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Correspondence to Theresa L. Whiteside.

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Czystowska, M., Strauss, L., Bergmann, C. et al. Reciprocal granzyme/perforin-mediated death of human regulatory and responder T cells is regulated by interleukin-2 (IL-2). J Mol Med 88, 577–588 (2010). https://doi.org/10.1007/s00109-010-0602-9

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