Macrophages and regulation of erythropoiesis

Rebecca N. Jacobsen, Andrew C. Perkins, Jean Pierre Levesque

Research output: Contribution to journalReview ArticleOtherpeer-review

27 Citations (Scopus)

Abstract

Purpose of review The nature and function of macrophages at the center of erythroblastic islands is not fully understood. This review discusses novel findings on the phenotypic and molecular characterization of erythroblastic island macrophages, and their role in regulating normal and pathological erythropoiesis. Recent findings The phenotype to prospectively isolate erythroblastic island macrophages from mouse bone marrow has been identified. In-vivo depletion of erythroblastic island macrophages causes blockade of erythroblast maturation and delays erythropoietic recovery following chemical insults. The cytokine granulocyte colony-stimulating factor arrests medullary erythropoiesis by depleting erythroblastic island macrophages from the bone marrow. In-vivo ablation of macrophages improves anemia associated with β-thalassemia and reduces red blood cell counts in the mouse model of polycythemia vera. The role of cell adhesion molecules regulating interactions between erythroblastic island macrophages and erythroblasts has been clarified, and mechanisms of pyrenocyte engulfment by erythroblastic island macrophages have been demonstrated to involve Mer tyrosine kinase receptor. Summary Prospective isolation of mouse erythroblastic island macrophages together with new genetic mouse models to specifically target erythroblastic island macrophages will enable molecular studies to better define their role in controlling erythroblast maturation. These studies have revealed the key role of erythroblastic island macrophages in regulating normal erythropoiesis and could be interesting targets to treat β-thalassemia or polycythemia vera.

Original languageEnglish
Pages (from-to)212-219
Number of pages8
JournalCurrent Opinion in Hematology
Volume22
Issue number3
DOIs
Publication statusPublished - 27 May 2015
Externally publishedYes

Keywords

  • anemia
  • erythroblastic island
  • erythropoiesis
  • macrophage
  • red blood cell

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