Vav1 in differentiation of tumoral promyelocytes.

Valeria Bertagnolo, Federica Brugnoli, Silvia Grassilli, Ervin Nika, Silvano Capitani

Section of Human Anatomy, Department of Morphology and Embryology, University of Ferrara, Ferrara, Italy. bgv@unife.it

Cellular signalling 2012 Mar

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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. Copyright © 2011 Elsevier Inc. All rights reserved.

Citation

Valeria Bertagnolo, Federica Brugnoli, Silvia Grassilli, Ervin Nika, Silvano Capitani. Vav1 in differentiation of tumoral promyelocytes. Cellular signalling. 2012 Mar;24(3):612-20