Abstract
Acute graft-versus-host disease (aGvHD) is still a major cause of transplant-related mortality after allogeneic stem cell transplantation (ASCT). It requires immunosuppressive treatments that broadly abrogate T cell responses including beneficial ones directed against tumor cells or infective pathogens. Polo-like kinase 1 (PLK1) is overexpressed in many cancer types including leukemia, and clinical studies demonstrated that targeting PLK1 using selective PLK1 inhibitors resulted in inhibition of proliferation and induction of apoptosis predominantly in tumor cells, supporting the feasibility of PLK1 as target for anticancer therapy. Here, we show that activation of alloreactive T cells (Tallo) up-regulate expression of PLK1, suggesting that PLK1 is a potential new candidate for dual therapy of aGvHD and leukemia after ASCT. Inhibition of PLK1, using PLK1-specific inhibitor GSK461364A selectively depletes Tallo by preventing activation and by inducing apoptosis in already activated Tallo, while memory T cells are preserved. Activated Tallo cells which survive exposure to PLK1 undergo inhibition of proliferation by induction of G2/M cell cycle arrest, which is accompanied by accumulation of cell cycle regulator proteins p21WAF/CIP1, p27Kip1, p53 and cyclin B1, whereas abundance of CDK4 decreased. We also show that suppressive effects of PLK1 inhibition on Tallo were synergistically enhanced by concomitant inhibition of molecular chaperone Hsp90. Taken together, our data suggest that PLK1 inhibition represents a reasonable dual strategy to suppress residual tumor growth and efficiently deplete Tallo, and thus provide a rationale to selectively prevent and treat aGvHD.
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Abbreviations
- aGvHD:
-
Acute graft-versus-host disease
- allo DC:
-
Allogeneic dendritic cells
- ASCT:
-
Allogeneic stem cell transplantation
- Tallo :
-
Alloreactive T cells
- C-3:
-
Caspase-3
- CFSE:
-
5-(and 6-)Carboxyfluorescein diacetate succinimidyl ester
- CI:
-
Combination indices
- CBA:
-
Cytometric bead array
- DC:
-
Dendritic cells
- DMAG:
-
17-(Dimethylaminoethylamino)-17-demethoxygeldanamycin
- DMSO:
-
Dimethyl sulfoxide
- FL:
-
Full length
- GM-CSF:
-
Granulocyte macrophage colony-stimulating factor
- GSK:
-
GSK461364 analogue 1
- Hsp90:
-
Heat shock protein 90
- IL:
-
Interleukin
- MLR:
-
Mixed leukocyte reaction
- PLK1:
-
Polo-like kinase 1
- PI:
-
Propidiumiodide
- rh:
-
Recombinant human
- TNF:
-
Tumor necrosis factor
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Acknowledgments
This work was supported by Grants from the Deutsche Forschungsgemeinschaft (KFO 216).
Author contributions
C.B. performed the research, analyzed the data; C.B., M.S.T., H.E. and M.C. designed the research; C.B., M.S.T., H.E. and M.C. wrote the manuscript.
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Berges, C., Chatterjee, M., Topp, M.S. et al. Targeting polo-like kinase 1 suppresses essential functions of alloreactive T cells. Immunol Res 64, 687–698 (2016). https://doi.org/10.1007/s12026-015-8778-2
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DOI: https://doi.org/10.1007/s12026-015-8778-2