Abstract
Introduction
Amino-bisphosphonates are potent activators of human γδ T cells. The aim of our study was to evaluate the immunomodulating properties of a single-dose of zoledronic acid (ZA) on γδ T cells in a select group of disease-free breast cancer patients with osteopenia.
Materials and methods
Blood samples were obtained, from 23 patients, before and 7, 28, 56, 90 and 180 days after a single-dose (4 mg) of ZA and analyzed by flow cyometry.
Results
A significant decrease of the different γδ T cell subsets was observed: Naïve (CD3+/Vdelta2+/CD45RA+/CD27+) after 180 days (P < 0.01); Central Memory (CD3+/Vdelta2+/CD45RA-CD27+) after 28 (P < 0.05), 90 (P < 0.01) and 180 days (P < 0.01); and Effector Memory (CD3+/Vdelta2+/CD45RA-/CD27-) after 56 (P < 0.01) and 90 (P < 0.05) days. Based on the observed γδ T cells kinetics patients could be divided in two groups: “responders” that showed a significant decrease in total numbers of γδ T cells and “non-responders” that showed no significant change. However, in vitro phosphoantigen stimulation of patients cells did not show significant differences in terms of IFN-γ response by Vδ2 T cells.
Conclusion
We describe for the first time a long-lasting activation of effector subsets of γδ T cells in disease-free breast cancer patients after a single-dose of ZA. Our results highlight the need to further investigate the clinical significance of the immunomodulating properties of N-BPs.
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Abbreviations
- N-BPs:
-
Amino-bisphosphonates
- BPs:
-
Bisphosphonates
- ZA:
-
Zoledronic acid
- γ/δ T Ly:
-
γ/δ T lymphocytes
- IPP:
-
Isopentenyl-diphosphate
- CM:
-
Central memory
- EM:
-
Effector memory
- TE:
-
Terminal effectors
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Acknowledgments
This work is in memory of Fabrizio Poccia. This work was supported by grants from MIUR (COFIN, 2005) and from “Giuliana Cardarelli Mazzi” cancer research foundation. Any financial/commercial conflicts have been disclosed.
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The authors declare no financial or commercial conflicts of interest.
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Santini, D., Martini, F., Fratto, M.E. et al. In vivo effects of zoledronic acid on peripheral γδ T lymphocytes in early breast cancer patients. Cancer Immunol Immunother 58, 31–38 (2009). https://doi.org/10.1007/s00262-008-0521-6
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DOI: https://doi.org/10.1007/s00262-008-0521-6