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- Title
Expression pattern of HOXB6 homeobox gene in myelomonocytic differentiation and acute myeloid leukemia.
- Authors
Giampaolo, A.; Felli, N.; Diverio, D.; Morsilli, O.; Samoggia, P.; Breccia, M.; Lo Coco, F.; Peschle, C.; Testa, U.
- Abstract
Homeobox genes encode transcription factors known to be important morphogenic regulators during embryonic development. An increasing body of work implies a role for homeobox genes in both hematopoiesis and leukemogenesis. In the present study we have analyzed the role of the homeobox gene, HOXB6, in the program of differentiation of the myeloid cell lines, NB4 and HL60. HOXB6 expression is transiently induced during normal granulocytopoiesis and monocytopoiesis, with an initial Induction during the early phases of differentiation, followed by a blockade of expression at early maturation. The enforced expression of HOXB6 in promyelocytic NB4 cells or in myeloblastlc HL60 cells elicited inhibition of the granulocytic or monocytic maturation, respectively. Furthermore, HOXB6 was frequently expressed (18 out of 49 cases) in AMLs lacking major translocations while it was expressed at very low frequency (two out of 47 cases) in AMLs characterized by PMI./RAR-α, AML-1/ETO, CBFβ/MYH11 fusion and rearrangements of the MLL gene at 11q23. According to these observations, we suggest that a regulated pattern of HOXB6 expression is required for normal granulopoiesis and monocytopoiesis. Abnormalities of the HOXB6 expression may contribute to the development of the leukemic phenotype.
- Subjects
HOMEOBOX genes; MYELOID leukemia
- Publication
Leukemia (08876924), 2002, Vol 16, Issue 7, p1293
- ISSN
0887-6924
- Publication type
Article
- DOI
10.1038/sj.leu.2402532