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Circulating Monocytes Contribute to Erythrocyte Clearance in Polycythemia Vera
Marina D Borges1, Izabela F Paes1, Daniela P Leonardo1
1Laboratory of Hemoglobin and Genome, Hematology and Hemotherapy Center, University of Campinas (UNICAMP), Campinas 13083-878, SP, Brazil.
Monocytes in polycythemia vera (PV) patients clear red blood cells and influence erythroid cell differentiation, similar to macrophages. This study reveals their role in PV erythrophagocytosis and erythropoiesis.
Area of Science:
- Hematology
- Cell Biology
- Immunology
Background:
- Erythropoiesis is elevated in polycythemia vera (PV).
- Macrophages in erythroblastic islands are crucial for erythropoiesis.
- The role of circulating monocytes in PV stress erythropoiesis is unclear.
Purpose of the Study:
- To investigate the phenotype and function of monocytes from PV patients.
- To assess monocyte involvement in erythroid cell clearance and iron handling.
- To determine if PV monocytes influence erythropoiesis.
Main Methods:
- Analysis of monocyte phenotype, erythroid cell clearance, and iron-related molecule expression in PV patients and healthy donors.
- Evaluation of erythrophagocytosis and expression of heme-oxygenase-1 and ferroportin.
- Assessment of monocyte markers (CD169, CD163, VCAM-1) and their effect on erythroid cell differentiation in vitro.
Main Results:
- PV monocytes contained red blood cell-derived material, with reduced Sirp-ɑ expression, indicating erythroid cell clearance.
- PV monocytes and erythroid cells increased erythrophagocytosis.
- PV monocytes showed enhanced heme degradation and iron export capabilities.
- PV monocytes expressed higher levels of CD169, CD163, and VCAM-1, influencing erythroid differentiation.
Conclusions:
- PV monocytes exhibit functional similarities to erythroblastic island macrophages.
- These findings deepen the understanding of erythrophagocytosis and erythropoiesis in PV.
- PV monocytes may interfere with erythropoiesis, offering new therapeutic perspectives.
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