Abstract
The Philadelphia-negative myeloproliferative neoplasms (MPNs), defined as clonal disorders of the hematopoietic stem cells, are characterized by the proliferation of mature myeloid cells in the bone marrow and a chronic inflammatory status impacting the initiation, progression, and symptomatology of the malignancies. There are three main entities defined as essential thrombocythemia (ET), polycythemia vera (PV), and primary myelofibrosis (PMF), and genetically classified by JAK2V617F, CALR, or MPL mutations. In MPNs, due to the overproduction of inflammatory cytokines by the neoplastic cells and non-transformed immune cells, chronic inflammation may provoke the generation and expansion of myeloid-derived suppressors cells (MDSCs) that highly influence the adaptive immune response. Although peripheral blood MDSC levels are elevated, their frequency in the bone marrow of MPNs patients is not well elucidated yet. Our results indicated increased levels of total (T)-MDSCs (CD33+HLA-DR−/low) and polymorphonuclear (PMN)-MDSCs (CD33+/HLA-DRlow/CD15+/CD14−) in the bone marrow and peripheral blood of all three types of MPNs malignancies. However, these bone marrow MDSCs-increased frequencies did not correlate with the clinical parameters, such as hepatomegaly, leukocytes, hemoglobin, or platelet levels, or with JAK2 and CALR mutations. Besides, bone marrow MDSCs, from ET, PV, and PMF patients, exhibited immunosuppressive function, determined as T-cell proliferation inhibition. Notably, the highest T-MDSCs and PMN-MDSC levels were found in PMF samples, and the increased MDSCs frequency strongly correlated with the degree of myelofibrosis. Thus, these data together indicate that the immunosuppressive MDSCs population is increased in the bone marrow of MPNs patients and may be implicated in generating a fibrotic microenvironment.
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Abbreviations
- CALR:
-
Calreticulin
- DC:
-
Dendritic cells
- ET:
-
Essential thrombocythemia
- GM-CSF:
-
Granulocyte macrophage-colony stimulating factor
- HD:
-
Healthy donors
- HSC:
-
Hematopoietic stem cell
- HU:
-
Hydroxyurea
- IL:
-
Interleukin
- JAK:
-
Janus Kinase
- LDH:
-
Lactate dehydrogenase
- MDSCs :
-
Myeloid-derived suppressor cells
- M-MDSCs:
-
Monocytic myeloid-derived suppressor cells
- MNCs:
-
Mononuclear cells
- MPL:
-
Thrombopoietin receptor
- MPNs :
-
Myeloproliferative neoplasms
- NK:
-
Natural Killer
- PMF:
-
Primary myelofibrosis
- PMN-MDSCs :
-
Polymorphonuclear myeloid-derived suppressor cells
- PV:
-
Polycythemia vera
- SE:
-
Sedimentation
- STAT:
-
Signal transducer and activators of transcription
- TGF-β1 :
-
Transforming growth factor-β1
- T-MDSCS:
-
Total myeloid-derived suppressors cells
- TNF-α:
-
Tumor necrosis factor-α
- WBC:
-
White blood cells
- WHO:
-
World Health Organization
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Funding: This study was funded by the Ministry of Education, Science and Technological Development of the Republic of Serbia (grant number 451-03-9/2021-14/200015).
Disclosure of Interests: All authors declare they have no conflict of interest.
Ethical Approval: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Approval was granted by the ethics committee of the Clinical Center of Serbia, Belgrade (decision number 4/1). This article does not contain any studies with animals performed by any of the authors.
Data Availability Statement: The material supporting the conclusions of this study have been included within the article
Acknowledgements: We thank the support of the visiting professor program of UBO to JFS.
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Kapor, S. et al. (2023). Increase in Frequency of Myeloid-Derived Suppressor Cells in the Bone Marrow of Myeloproliferative Neoplasm: Potential Implications in Myelofibrosis. In: Simon, F., Bernabeu, C. (eds) Advances in Molecular Pathology. Advances in Experimental Medicine and Biology, vol 1408. Springer, Cham. https://doi.org/10.1007/978-3-031-26163-3_15
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