Enforced Expression of BMI-1 in Postnatal Human CD34+ Cells Promotes Erythroid Differentiation.
10.5045/kjh.2007.42.3.241
- Author:
Gabsang LEE
1
;
Byung Soo KIM
;
Jae Hung SHIEH
;
Malcolm A S MOORE
Author Information
1. Craniomaxillofacial Life Science 21, College of Dentistry, Seoul National University, Korea. gabsang@gmail.com
- Publication Type:Original Article
- Keywords:
Bmi-1;
Erythroid differentiation;
CD34+ cell
- MeSH:
Cell Proliferation;
Coculture Techniques;
Erythropoiesis;
Erythropoietin;
Fetal Blood;
Glycophorin;
Hematopoietic Stem Cells;
Humans*;
Lentivirus;
Stem Cells
- From:Korean Journal of Hematology
2007;42(3):241-249
- CountryRepublic of Korea
- Language:English
-
Abstract:
BACKGROUND: The Polycomb-group gene Bmi-1 is known to be a molecular regulator of self-renewal of normal and leukemic stem cells and be involved in various aspects of cellular proliferation, differentiation, and survival. METHODS: This study evaluated the effects of overexpression of Bmi-1 on human cord blood CD34+ cells. Bmi-1 was introduced into CD34+ cells through lentivirus transduction. Bmi-1 expressing CD34+ cells were applied to colony forming assay, stromal co-culture, and cytokine-stimulatied culture. RESULTS: Ectopic expression of Bmi-1 resulted in the increased number of erythroid colonies in primary and secondary colony forming assay in an erythropoietin dependent manner. In stromal co-culture, Bmi-1-expressing postnatal hematopoietic stem cells seemed to lose the ability of self-renewal, as determined by week 5 cobblestone area-forming cell assay and by week 5 secondary colony assay. In cytokine-stimulated suspension culture of Bmi-1-transduced CD34+ cells, we observed increased erythropoiesis marked by Glycophorin A expression. CONCLUSION: Our data suggest that ectopic expression of Bmi-1 in human hematopoietic stem/progenitor cells may result in the differentiation to the erythroid lineage rather than promoting self-renewal.
