Effect of the Nonpeptide Thrombopoietin Receptor Agonist Eltrombopag on Bone Marrow Cells from Patients with Acute Myeloid Leukemia and Myelodysplastic Syndrome
Overview
Authors
Affiliations
Thrombocytopenia is a frequent symptom and clinical challenge in patients with myelodysplastic syndrome (MDS) and acute myeloid leukemia (AML). Eltrombopag is a small molecule thrombopoietin receptor agonist that might be a new option to treat thrombocytopenia in these diseases, provided that it does not stimulate malignant hematopoiesis. In this work, we studied the effects of Eltrombopag on proliferation, apoptosis, differentiation, colony formation, and malignant self-renewal of bone marrow mononuclear cells of patients with AML and MDS. Malignant bone marrow mononuclear cells did not show increased proliferation, or increased clonogenic capacity at concentrations of Eltrombopag ranging from 0.1 to 30 microg/mL. On the contrary, we observed a moderate, statistically nonsignificant (P = .18), decrease of numbers of malignant cells (mean, 56%; SD, 28%). Eltrombopag neither led to increased 5-bromo-2-deoxyuridine incorporation, decreased apoptosis, an increase of malignant self-renewal, nor enhanced in vivo engraftment in xenotransplantations. Furthermore, we found that Eltrombopag was capable of increasing megakaryocytic differentiation and formation of normal megakaryocytic colonies in patients with AML and MDS. These results provide a preclinical rationale for further testing of Eltrombopag for treatment of thrombocytopenia in AML and MDS.
Avatrombopag for the salvage treatment of platelet transfusion refractoriness.
Qin Y, Wang Y, Zhang Y, Jiao Y, Ye J Ther Adv Hematol. 2024; 15:20406207241237606.
PMID: 38481948 PMC: 10935753. DOI: 10.1177/20406207241237606.
Current Understanding of Immune Thrombocytopenia: A Review of Pathogenesis and Treatment Options.
Mititelu A, Onisai M, Rosca A, Vladareanu A Int J Mol Sci. 2024; 25(4).
PMID: 38396839 PMC: 10889445. DOI: 10.3390/ijms25042163.
Eltrombopag increases the hematopoietic supporting ability of mesenchymal stem/stromal cells.
Muntion S, Preciado S, Sanchez-Luis E, Corchete L, Diez-Campelo M, Osugui L Ther Adv Hematol. 2023; 13:20406207221142137.
PMID: 36601635 PMC: 9806379. DOI: 10.1177/20406207221142137.
Avatrombopag for the treatment of thrombocytopenia post hematopoietic stem-cell transplantation.
Zhou M, Qi J, Gu C, Wang H, Zhang Z, Wu D Ther Adv Hematol. 2022; 13:20406207221127532.
PMID: 36185780 PMC: 9523859. DOI: 10.1177/20406207221127532.
Megakaryopoiesis impairment through acute innate immune signaling activation by azacitidine.
Okoye-Okafor U, Javarappa K, Tsallos D, Saad J, Yang D, Zhang C J Exp Med. 2022; 219(11).
PMID: 36053753 PMC: 9441716. DOI: 10.1084/jem.20212228.