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 Blood, 15 November 2005, Vol. 106, No. 10, pp. 3639-3645.
Prepublished online as a Blood First Edition Paper on August 9, 2005; DOI 10.1182/blood-2005-04-1376.

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RED CELLS

Evidence for ineffective erythropoiesis in severe sickle cell disease

Catherine J. Wu, Lakshamanan Krishnamurti, Jeffery L. Kutok, Melinda Biernacki, Shelby Rogers, Wandi Zhang, Joseph H. Antin, and Jerome Ritz

From the Division of Hematologic Malignancies, Dana-Farber Cancer Institute; and the Departments of Medicine and Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA; and Children's Hospital of Pittsburgh, PA.

Peripheral destruction of sickled erythrocytes is a cardinal feature of sickle cell disease (SCD). Less well established is the potential contribution of ineffective erythropoiesis to the pathophysiology of this hemoglobinopathy. Since patients with SCD frequently develop mixed hematopoietic chimerism after allogeneic nonmyeloablative stem cell transplantation, we used this opportunity to directly compare the differentiation and survival of SCD and donor-derived erythropoiesis in vivo. Donor and recipient erythropoiesis was compared in 4 patients with SCD and 4 without SCD who developed stable mixed hematopoietic chimerism following transplant. Molecular analysis of chimerism in peripheral blood and bone marrow demonstrated higher expression of donor-derived {beta}-globin RNA relative to the level of donor-derived genomic DNA in patients with SCD. Analysis of chimerism in immature (glycophorin A–positive [GYPA+], CD71hi) and mature (GYPA+, CD71neg) erythroblasts confirmed the intramedullary loss of SS erythroblasts with progressive maturation. In patients with SCD, relative enrichment of donor erythroid precursors began to appear at the onset of hemoglobinization. Ineffective erythropoiesis of homozygous hemoglobin S (SS) progenitors thus provides a maturation advantage for homozygous hemoglobin A (AA) or heterozygous hemoglobin S/hemoglobin A (SA) donor erythroid precursor cells that results in greater donor contribution to overall erythropoiesis following stem-cell transplantation and improvement of clinical disease.


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