Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz

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SHR Neuro Krebs Kardio Lipid

Wölfler, A; Danen-van Oorschot, AA; Haanstra, JR; Valkhof, M; Bodner, C; Vroegindeweij, E; van Strien, P; Novak, A; Cupedo, T; Touw, IP.
Lineage-instructive function of C/EBPα in multipotent hematopoietic cells and early thymic progenitors.
Blood. 2010; 116(20):4116-4125 [OPEN ACCESS]
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Autor/innen der Med Uni Graz:
Novak Alexandra
Wölfler Albert
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Abstract:
Hematopoiesis is tightly controlled by transcription regulatory networks, but how and when specific transcription factors control lineage commitment are still largely unknown. Within the hematopoietic stem cell (Lin(-)Sca-1(+)c-Kit(+)) compartment these lineage-specific transcription factors are expressed at low levels but are up-regulated with the process of lineage specification. CCAAT/enhancer binding protein α (C/EBPα) represents one of these factors and is involved in myeloid development and indispensable for formation of granulocytes. To track the cellular fate of stem and progenitor cells, which express C/EBPα, we developed a mouse model expressing Cre recombinase from the Cebpa promoter and a conditional EYFP allele. We show that Cebpa/EYFP(+) cells represent a significant subset of multipotent hematopoietic progenitors, which predominantly give rise to myeloid cells in steady-state hematopoiesis. C/EBPα induced a strong myeloid gene expression signature and down-regulated E2A-induced regulators of early lymphoid development. In addition, Cebpa/EYFP(+) cells compose a fraction of early thymic progenitors with robust myeloid potential. However, Cebpa/EYFP(+) multipotent hematopoietic progenitors and early thymic progenitors retained the ability to develop into erythroid and T-lymphoid lineages, respectively. These findings support an instructive but argue against a lineage-restrictive role of C/EBPα in multipotent hematopoietic and thymic progenitors.
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Cell Compartmentation -
Cell Lineage -
Cell Proliferation -
Colony-Forming Units Assay -
Dendritic Cells - cytology
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Organ Culture Techniques -
RNA, Messenger - genetics
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