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Erythropoiesis

Erythropoiesis

Red blood cells (RBCs) transport oxygen to all body tissues. These cells survive only for 120 days and then need to be replenished. Erythropoiesis is the process of RBC production. In healthy individuals, erythropoiesis ensures all tissues are amply supplied with oxygen. In addition, blood loss due to injury leads to a drop in the physiological oxygen level that will cause erythropoiesis. Any defect in erythropoiesis leads to several physiological disorders, including thalassemia, anemia,...

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Colony Forming Cell CFC Assay for Human Hematopoietic Cells

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Hydroxyurea Decouples Persistent F-Cell Elevation and Induction of γ-Globin.

Aisha L Walker¹, Danielle Crosby², Valerie Miller³

¹Pittsburgh Heart Blood and Lung Vascular Medicine Institute, Department of Medicine, University of Pittsburgh, Pittsburgh, PA; Department of Pediatrics, Emory University, Atlanta, GA.

Experimental Hematology

|July 17, 2022

Summary

The Townes mouse model shows fetal hemoglobin (HbF) silencing post-birth, similar to humans. Hydroxyurea

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Lentiviral-mediated Knockdown During Ex Vivo Erythropoiesis of Human Hematopoietic Stem Cells

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Published on: July 16, 2011

Area of Science:

Hematology
Genetics
Pharmacology

Background:

Fetal hemoglobin (HbF) levels are therapeutically relevant for sickle cell disease.
Understanding the fetal-to-adult hemoglobin switch is crucial for developing new treatments.

Purpose of the Study:

Investigate developmental γ-globin silencing in the Townes humanized knock-in mouse model.
Evaluate the utility of this model for assessing pharmacologic induction of HbF.

Main Methods:

Studied Townes mice (SS, AS, AA genotypes) from birth (P0) to 28 days (P28).
Monitored F cell percentages and BCL11A expression.
Administered hydroxyurea at different time points (P2 and P4).

Main Results:

F cell percentages decreased from 100% at P0 to undetectable levels by P14 in untreated mice.
γ-globin silencing was complete by P4, correlating with increased BCL11A expression.
Hydroxyurea initiated at P2 sustained F cells at P14, but not when initiated at P4, suggesting erythropoiesis suppression rather than direct γ-globin reactivation.

Conclusions:

The Townes mouse model accurately recapitulates the human postnatal γ- to β-globin switch.
Hydroxyurea's myelosuppressive toxicity is a critical factor in interpreting HbF induction efficacy.
This model provides insights into hemoglobin switching mechanisms and therapeutic interventions for hemoglobinopathies.