Abstract
Response to immunosuppressive therapy (IST) in younger patients with myelodysplastic syndrome (MDS) has been linked to a T-cell-dominant autoimmune process that impairs hematopoiesis. Analysis of the age-adjusted CD4:CD8 ratio in 76 MDS patients compared with 54 healthy controls showed that inadequate CD4+, rather than expansion of CD8+ T cells, was associated with a lower ratio in a group that included both lower and higher risk MDS patients defined by the International Prognostic Scoring System. In younger MDS patients, naive and memory phenotypes defined by CD45RA and CD62L display showed depletion of naive CD4+ and CD8+ T cells, suggesting a possible relationship to IST responsiveness. To determine the correlation between T-cell subset distribution, T-cell turnover and autoimmunity, a cohort of 20 patients were studied before and after IST. The CD4:CD8 ratio correlated inversely with the proliferative T-cell index before treatment in IST-responsive patients, suggesting that proliferation may be linked to accelerated CD4+ T-cell turnover and hematopoietic failure. Our data show seminal findings that both CD4+ and CD8+ T-cell subsets are dysregulated in MDS. Association between these T-cell defects and response to IST suggests that aberrant T-cell homeostasis and chronic activation are critical determinants influencing autoimmune hematopoietic suppression in younger patients.
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Acknowledgements
This work was conducted by Moffitt Cancer Center Malignant Hematology Program and partially supported by grants from the Veterans' Administration Hospital and NCI (CA112112-01). The project described was supported by U54RR019397-05 from the NIH. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the NIH. We would like to thank the Flow Cytometry Core Facility for assistance with this project.
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Zou, J., Rollison, D., Boulware, D. et al. Altered naive and memory CD4+ T-cell homeostasis and immunosenescence characterize younger patients with myelodysplastic syndrome. Leukemia 23, 1288–1296 (2009). https://doi.org/10.1038/leu.2009.14
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DOI: https://doi.org/10.1038/leu.2009.14
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