4.2 Article

New insights into erythropoiesis

Journal

CURRENT OPINION IN HEMATOLOGY
Volume 9, Issue 2, Pages 93-100

Publisher

LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/00062752-200203000-00002

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Funding

  1. NHLBI NIH HHS [HL65906, HL49118] Funding Source: Medline
  2. NIDDK NIH HHS [DK39781] Funding Source: Medline
  3. NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [R01HL065906, R29HL049118, R01HL049118] Funding Source: NIH RePORTER
  4. NATIONAL INSTITUTE OF DIABETES AND DIGESTIVE AND KIDNEY DISEASES [R01DK039781] Funding Source: NIH RePORTER

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Commitment of hematopoietic cells to the erythroid lineage involves the actions of several transcription factors, including TAL1, LMO2, and GATA-2. The differentiation of committed erythroid progenitor cells involves other transcription factors, including NF-E2 and EKLF. Upon binding erythropoietin, the principal regulator of erythropoiesis, cell surface erythropoietin receptors dimerize and activate specific intracellular kinases, including Janus family tyrosine protein kinase 2, phosphoinositol-3 kinase, and mitogen-activated protein kinase. Important substrates of these kinases are tyrosines in the erythropoietin receptors themselves and the signal transducer and transcription activator proteins. Erythropoietin prevents erythroid cell apoptosis. Some of the apoptotic tendency of erythroid cells can be attributed to proapoptotic molecules produced by hematopoietic cells, macrophages, and stromal cells. Cell divisions accompanying terminal erythroid differentiation are finely controlled by cell cycle regulators, and disruption of these terminal divisions causes erythroid cell apoptosis. In reticulocyte maturation, regulated degradation of internal organelles involves a lipoxygenase, whereas survival requires the antiapoptotic protein Bcl-x. Curr Opin Hematol 2002, 9:93-100 (C) 2002 Lippincott Williams Wilkins, Inc.

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