title: Vav1 in differentiation of tumoral promyelocytes.
abstract: The multidomain protein Vav1, in addition to promote the acquisition of maturation related properties by normal hematopoietic cells, is a key player in the ATRA- and PMA-induced completion of the differentiation program of tumoral myeloid precursors derived from APL. This review is focussed on the role of Vav1 in differentiating promyelocytes, as part of interconnected networks of functionally related proteins ended to regulate different aspects of myeloid maturation. The role of Vav1 in determining actin cytoskeleton reorganization alternative to the best known function as a GEF for small G proteins is discussed, as well as the binding of Vav1 with cytoplasmic and nuclear signaling molecules which provides a new perspective in the modulation of nuclear architecture and activity. In particular, new hints are provided on the ability of Vav1 to determine the nuclear amount of proteins implicated in modulating mRNA production and stability and in regulating the ATRA-dependent protein expression also by direct interaction with transcription factors known to drive the ATRA-induced maturation of myeloid cells. The reviewed findings summarize the major advances in the understanding of additional, non conventional functions connected with the vast interactive potential of Vav1.
authors: Section of Human Anatomy, Department of Morphology and Embryology, University of Ferrara, Ferrara, Italy. bgv@unife.it
authors: Valeria
authors: V
authors: Bertagnolo
authors: Federica
authors: F
authors: Brugnoli
authors: Silvia
authors: S
authors: Grassilli
authors: Ervin
authors: E
authors: Nika
authors: Silvano
authors: S
authors: Capitani
mesh_terms: D008841:Actin Cytoskeleton; D002454:Cell Differentiation; D002467:Cell Nucleus / Q000378:metabolism / Q000502:physiology; D004268:DNA-Binding Proteins / Q000378:metabolism; D042381:Granulocyte Precursor Cells / Q000166:cytology*; D006801:Humans; D015473:Leukemia, Promyelocytic, Acute / Q000378:metabolism* / Q000473:pathology; D051567:Proto-Oncogene Proteins c-vav / Q000378:metabolism / Q000502:physiology*; D012333:RNA, Messenger / Q000378:metabolism; D014157:Transcription Factors / Q000378:metabolism
chemical_list: D004268:DNA-Binding Proteins; D051567:Proto-Oncogene Proteins c-vav; D012333:RNA, Messenger; C480633:SLC2A4RG protein, human; D014157:Transcription Factors; C496618:VAV1 protein, human