Effects of rigosertib on the osteo-hematopoietic niche in myelodysplastic syndromes
Balaian E, Weidner H, Wobus M, Baschant U, Jacobi A, Mies A, Bornhaeuser M, Guck J, Hofbauer LC, Rauner M, Platzbecker U (2019)
Publication Type: Journal article
Publication year: 2019
Journal
Book Volume: 98
Pages Range: 2063-2072
Journal Issue: 9
DOI: 10.1007/s00277-019-03756-1
Abstract
Rigosertib is a novel multi-kinase inhibitor, which has clinical activity towards leukemic progenitor cells of patients with high-risk myelodysplastic syndromes (MDS) after failure or progression on hypomethylating agents. Since the bone marrow microenvironment plays an important role in MDS pathogenesis, we investigated the impact of rigosertib on cellular compartments within the osteo-hematopoietic niche. Healthy C57BL/6J mice treated with rigosertib for 3 weeks showed a mild suppression of hematopoiesis (hemoglobin and red blood cells, both − 16%, p < 0.01; white blood cells, − 34%, p < 0.05; platelets, − 38%, p < 0.05), whereas there was no difference in the number of hematopoietic stem cells in the bone marrow. Trabecular bone mass of the spine was reduced by rigosertib (− 16%, p = 0.05). This was accompanied by a lower trabecular number and thickness (− 6% and − 10%, respectively, p < 0.05), partly explained by the increase in osteoclast number and surface (p < 0.01). Milder effects of rigosertib on bone mass were detected in an MDS mouse model system (NHD13). However, rigosertib did not further aggravate MDS-associated cytopenia in NHD13 mice. Finally, we tested the effects of rigosertib on human mesenchymal stromal cells (MSC) in vitro and demonstrated reduced cell viability at nanomolar concentrations. Deterioration of the hematopoietic supportive capacity of MDS-MSC after rigosertib pretreatment demonstrated by decreased number of colony-forming units, especially in the monocytic lineage, further supports the idea of disturbed crosstalk within the osteo-hematopoietic niche mediated by rigosertib. Thus, rigosertib exerts inhibitory effects on the stromal components of the osteo-hematopoietic niche which may explain the dissociation between anti-leukemic activity and the absence of hematological improvement.
Authors with CRIS profile
Involved external institutions
Universitätsklinikum Carl Gustav Carus Dresden
Germany (DE)
Technische Universität Dresden
Germany (DE)
Universitätsklinikum Leipzig
Germany (DE)
Germany (DE)
Technische Universität Dresden
Germany (DE)
Universitätsklinikum Leipzig
Germany (DE)
How to cite
APA:
Balaian, E., Weidner, H., Wobus, M., Baschant, U., Jacobi, A., Mies, A.,... Platzbecker, U. (2019). Effects of rigosertib on the osteo-hematopoietic niche in myelodysplastic syndromes. Annals of Hematology, 98(9), 2063-2072. https://doi.org/10.1007/s00277-019-03756-1
MLA:
Balaian, Ekaterina, et al. "Effects of rigosertib on the osteo-hematopoietic niche in myelodysplastic syndromes." Annals of Hematology 98.9 (2019): 2063-2072.
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