Abstract
Vav1 is a critical signal transducer for both the development and function of normal hematopoietic cells, in which it regulates the acquisition of maturation-related properties, including adhesion, motility, and phagocytosis. Vav1 is also important for the agonist-induced maturation of acute promyelocytic leukemia (APL)-derived promyelocytes, in which it promotes the acquisition of a mature phenotype by playing multiple functions at both cytoplasmic and nuclear levels. We investigated the possible role of Vav1 in the differentiation of leukemic precursors to monocytes/macrophages. Tumoral promyelocytes in which Vav1 was negatively modulated were induced to differentiate into monocytes/macrophages with phorbol-12-myristate-13-acetate (PMA) and monitored for their maturation-related properties. We found that Vav1 was crucial for the phenotypical differentiation of tumoral myeloid precursors to monocytes/macrophages, in terms of CD11b expression, adhesion capability and cell morphology. Confocal analysis revealed that Vav1 may synergize with actin in modulating nuclear morphology of PMA-treated adherent cells. Our data indicate that, in tumoral promyelocytes, Vav1 is a component of lineage-specific transduction machineries that can be recruited by various differentiating agents. Since Vav1 plays a central role in the completion of the differentiation program of leukemic promyelocytes along diverse hematopoietic lineages, it can be considered a common target for developing new therapeutic strategies for the various subtypes of myeloid leukemias.
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Abbreviations
- ATRA:
-
All trans-retinoic acid
- APL:
-
Acute promyelocytic leukemia
- BSA:
-
Bovine serum albumin
- DAPI:
-
4,6-Diamino-2-phenylindole
- DABCO:
-
1,4-Diazabicyclo [2.2.2] octane
- DMSO:
-
Dimethyl sulfoxide
- FBS:
-
Fetal bovine serum
- FITC:
-
Fluorescein isothiocyanate
- GEF:
-
Guanine Nucleotide exchange factor
- PBS:
-
Phosphate-buffered saline
- PIC:
-
Piceatannol
- PMA:
-
Phorbol-12-myristate-13-acetate
- siRNA:
-
Small interfering RNA
- TRITC:
-
Tetramethylrhodamine isothiocyanate
- TBS:
-
TRIS-buffered saline
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This research was supported by grants from MIUR Cofin (2007) to S.C., MAE (Italy-Croatia bilateral project 2009–2010) to V.B., and local funds from the University of Ferrara (Italy) to S.C. and V.B.
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Bertagnolo, V., Nika, E., Brugnoli, F. et al. Vav1 is a crucial molecule in monocytic/macrophagic differentiation of myeloid leukemia-derived cells. Cell Tissue Res 345, 163–175 (2011). https://doi.org/10.1007/s00441-011-1195-5
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DOI: https://doi.org/10.1007/s00441-011-1195-5