Loss of C/EBP alpha cell cycle control increases myeloid progenitor proliferation and transforms the neutrophil granulocyte lineage
Författare
Summary, in English
CCAAT/enhancer binding protein (C/EBP)alpha is a myeloid-specific transcription factor that couples lineage commitment to terminal differentiation and cell cycle arrest, and is found mutated in 9% of patients who have acute myeloid leukemia (AML). We previously showed that mutations which dissociate the ability of C/EBP alpha to block cell cycle progression through E2F inhibition from its function as a transcriptional activator impair the in vivo development of the neutrophil granulocyte and adipose lineages. We now show that such mutations increase the capacity of bone marrow ( BM) myeloid progenitors to proliferate, and predispose mice to a granulocytic myeloproliferative disorder and transformation of the myeloid compartment of the BM. Both of these phenotypes were transplantable into lethally irradiated recipients. BM transformation was characterized by a block in granulocyte differentiation, accumulation of myeloblasts and promyelocytes, and expansion of myeloid progenitor populations - all characteristics of AML. Circulating myeloblasts and hepatic leukocyte infiltration were observed, but thrombocytopenia, anemia, and elevated leukocyte count - normally associated with AML - were absent. These results show that disrupting the cell cycle regulatory function of C/EBP alpha is sufficient to initiate AML-like transformation of the granulocytic lineage, but only partially the peripheral pathology of AML.
Avdelning/ar
- Immunology
- Stamcellscentrum (SCC)
Publiceringsår
2005
Språk
Engelska
Sidor
85-96
Publikation/Tidskrift/Serie
Journal of Experimental Medicine
Volym
202
Issue
1
Dokumenttyp
Artikel i tidskrift
Förlag
Rockefeller University Press
Ämne
- Immunology in the medical area
Status
Published
Forskningsgrupp
- Immunology
ISBN/ISSN/Övrigt
- ISSN: 1540-9538