Vav

..The SH2/SH3-containing protein Vav also contains a guanine nucleotide exchange factor domain, and Vav has a crucial role in thymocyte development and ..

..Thus, the discovery of prooncogenic pathways regulated by Vav1 makes it an attractive target for therapeutic intervention...

The protooncogenic protein Vav has the structure of an intracellular signal transducer. It is exclusively expressed in cells of hematopoietic lineage and plays a crucial role in hematopoietic cell differentiation...

..b>Vav, a guanosine diphosphate (GDP)-guanosine triphosphate (GTP) exchange factor for Rac that stimulates the exchange of ..

..Its function is demonstrated by inhibition of T cell activation following overexpression of a mutant form lacking critical tyrosine residues. Therefore, we propose to name the molecule LAT-linker for activation of T cells...

T cell activation stimulates p56(lck), p59(fyn), ZAP-70, Vav-SLP-76 binding, and IL-2 transcription. Major questions concern the tyrosine-kinase and relevant site(s) needed for Vav-SLP-76 complex formation and its role in IL-2 production...

b>Vav proteins are guanine nucleotide exchange factors for Rho family GTPases which activate pathways leading to actin cytoskeletal rearrangements and transcriptional alterations...

..the T cell antigen receptor (TCR) leads to tyrosine phosphorylation of a number of cellular proteins, including the vav proto-oncogene product...

A novel human oncogene, designated vav, was generated by a genetic rearrangement during gene transfer assays. The vav oncogene directs the synthesis of a 3.0 kb mRNA from which we isolated a 2.8 kb-long complementary DNA copy...

The Rac/Rho-specific guanine nucleotide exchange factor, Vav-1, is a key component of the T-cell antigen receptor (TCR)-linked signaling machinery...

..We present evidence that the product of the vav proto-oncogene, p95vav, interacts specifically with the focal adhesion protein zyxin both in vitro and in yeast two ..

The Vav family of guanine nucleotide exchange factors for Rho family GTPases plays a critical role in lymphocyte proliferation, gene transcription, and cytoskeleton reorganization following immunoreceptor stimulation...

..on the mucosal mast cell line, RBL-2H3, results in the rapid and persistent tyrosine phosphorylation of Vav. Immunoprecipitation of Vav from activated cells revealed co-immunoprecipitated phosphoproteins of molecular ..

The proto-oncogene vav is expressed solely in hematopoietic cells and plays an important role in cell signaling, although little is known about the proteins involved in these pathways...

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..Here, we report that Syk interacts in the yeast two-hybrid system with Vav, a proto-oncogene product exclusively expressed in hematopoietic cells...

b>Vav has structural features found in signaling proteins and is expressed only in hematopoietic cells. The recent development of mice Vav -/- has confirmed a major role of Vav in early blood cell development...

..Here we describe a positive regulatory role for 3BP2 in NK cell-mediated cytotoxicity. We also identify p95(vav) and phospholipase C-gamma isoforms as binding partners of 3BP2...

..platelets stimulated by thrombopoietin is approximately 85 to 95 kD, we examined the possibility that this could be Vav, a 95-kD proto-oncogene product...

..Ephrin-A1 stimulation recruits the binding of Vav proteins to the activated EphA2 receptor...

A recently reported new member of the Vav family proteins, Vav3 has been identified as a Ros receptor protein tyrosine kinase (RPTK) interacting protein by yeast two-hybrid screening...

..the role of Rac1 and then determined the contribution of a subfamily of Guanine Nucleotide Exchange Factors (GEFs), Vav, to the action of Hcys on Rac and NADPH oxidase activities in RMCs...

..Conclusion:Vav1 protects Jurkat cells from Fas-mediated apoptosis by promoting Bcl-2 transcription through its GEF activity...

b>Vav family proteins are members of the Dbl family of guanine nucleotide exchange factors and activators of Rho family small GTPases...

Although Vav can act as a guanine nucleotide exchange factor for RhoA, Rac1, and Cdc42, its transforming activity has been ascribed primarily to its ability to activate Rac1...

The guanine nucleotide-exchange factor Vav is a regulator of antigen-mediated cytoskeletal reorganization required for receptor clustering, proliferation and thymic selection...

..in abnormal DN T cells, biochemical analyses were conducted for the expression and tyrosine phosphorylation of the vav proto-oncogene product (Vav) in DN T cells from lpr mice...

Vav2 is a member of the Vav family that serves as a guanine nucleotide exchange factor for the Rho family of Ras-related GTPases. Unlike Vav1, whose expression is restricted to cells of hematopoietic origin, Vav2 is broadly expressed...

The proto-oncogene product Vav is required for receptor clustering, proliferation, and differentiation of T cells, and Vav was identified as a substrate in the TCR and B cell receptor signaling pathway...

..Hence, this study defines a new role for Vav1 in regulating granulocytic leukocytes as well as linking Vav1 to specific cellular responses downstream of a seven transmembrane domain receptor...

..The proto-oncogene vav is expressed in haematopoietic cells and its product Vav contains sequence motifs commonly found in ..

..Although Vav family guanine nucleotide exchange factors impact processes highly relevant to atherogenesis and are involved in ..

We currently reported that Vav2, a member of the guanine nucleotide exchange factor-Vav subfamily, participates in homocysteine-induced increases in Rac1 activity and consequent activation of NADPH oxidase in rat mesangial cells...

b>Vav guanine nucleotide exchange factors modulate changes in cytoskeletal organization through activation of Rho, Rac, and Cdc42 small GTPases...

..Three small plaque mutants, D41A, G83L, and the triple mutant GPG((8-10))VAV, had defects in subgenome synthesis, minus-strand synthesis, and overall levels of viral RNA synthesis, ..

The vav proto-oncogene is exclusively expressed in hematopoietic cells and encodes a 95-kDa protein that contains multiple structural domains...

..proteins were selectively diminished in SOCS1-/- BMMCs, which also showed lower molecular mass products of p85 and Vav suggesting proteolytic degradation...

..To report evidence of changes in posterior pole retinal thickness in glaucoma and preperimetric glaucoma...

The transcriptional induction of the vav proto-oncogene coincides with the first appearance of the definitive hematopoietic stem cell in the aorta-gonad-mesonephros region...

..Other downstream targets for ceramide action include Cox, IL-6 and IL-2 gene expression, PKC zeta, Vav, Rb, c-Myc, c-Fos, c-Jun and other transcriptional regulators...

..domains that serve to engage a diverse group of molecular partners including DNA, RNA, the product of the proto-oncogene vav, and tyrosine and serine/threonine kinases...

..The protooncogene vav (p95) is involved in T-cell activation and in the intrathymic selection of developing T cells...

The Vav proteins are guanine exchange factors (GEFs) that trigger the activation of the Rho GTPases in general and the Rac family in particular...

..Several intracellular signaling proteins, such as CBL and VAV, were phosphorylated on tyrosine in response to CD80, CD86, and anti-CD28 mAb...

..Our results strongly suggest that Sam68 contributes to transformation by oncogenic Vav1...

..CHS-111 inhibited the interaction of RhoA with Vav, the membrane association and the phosphorylation of Vav...

..Here, Syk colocalized with Vav, a guanine nucleotide exchange factor for Rac and Cdc42...

..We also show that Vav1 functions upstream of PI3K and is required for activation of PI3K. Together, our results provide an important insight into the mechanistic aspects of microglial activation in response to beta-glucans...

..We have generated mouse lines expressing Cre recombinase in hematopoietic tissues using the vav regulatory elements, or in lymphoid cells using the hCD2 promoter and locus control region (LCR)...

Proportional assist ventilation (PAV) uses volume assist (VAV) and flow assist ventilation (FAV) to reduce elastic and resistive effort, respectively...

..The present report provides evidence that the hemopoietic guanine nucleotide exchange factor (GEF), Vav, and its target GTPase, Rac, lie downstream from this initial signaling complex...

We previously showed that Vav promoter-tetracycline transactivator (Vav-tTA)-driven tetracycline-regulated element (TRE)-NRAS(V12) expression resulted in mastocytosis development in mice...

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..to measure these airflow rates supplied to space, especially when the space is served by a variable air volume (VAV) system...

..Furthermore, these findings indicate that the GEF activity of vav1 is required for its ability to mediate macrophage activation by LPS...

..cells, we found that overexpression of a dominant-negative form of the guanine nucleotide exchange factor Vav, but not the dominant-negative versions SWAP70, Dock2, or ELMO1 interfered with CEACAM3-initiated phagocytosis...

b>Vav proteins belong to the family of guanine-nucleotide-exchange factors for the Rho/Rac family of small G-proteins...

Integrin regulation of neutrophils is essential for appropriate adhesion and transmigration into tissues. Vav proteins are Rho family guanine nucleotide exchange factors that become tyrosine phosphorylated in response to adhesion...

..The present study has provided evidence for a possible role of Vav1 but not Vav2 in the later stages of platelet aggregation...

..Taken together, our results indicate that Vav1 and Vav2 exert overlapping but nonidentical functions in T cells. The negative regulatory pathway elicited by Vav2 might play an important role in regulating lymphocyte activation processes...

..cm), peak power (Pmax), peak power per kilogram of body mass (Pmax kg), mean power (Pav), and mean velocity (Vav) were recorded...

..We have studied the events underlying cap formation using mice bearing a null mutation in vav (vav-/-), a gene that encodes a guanine-nucleotide exchange factor for the GTPase Rac.

..The association of Vav1 with other proteins, detected by SH2 profiling, might affect other Vav1-dependent activities, such as NFAT stimulation...

..b>Vav proteins are RhoGEFs that modulate cytoskeletal networks in immune cells...

..Previous studies suggested the association of Nef with at least three independent GEFs, Vav, DOCK2/ELMO1, and betaPix...

b>Vav is a signal transducing molecule containing C-terminal Src homology 3 (SH3)-SH2-SH3 domains, and has been thought to be expressed exclusively in hematopoietic and trophoblastic cells...

b>Vav, a guanine nucleotide exchange factor for members of the Rho family of small GTPases, is activated through engagement of B and T lymphocyte antigen receptors...

..This vector configuration deserves further evaluation and consideration for future clinical trials...

..Expression of a carboxy-terminal fragment of Vav2 decreased the elevation of Rac1 activity induced by epidermal growth factor, consistent with Vav2 mediating activation of Rac1 downstream from growth factor receptors...

..The aim of this study was to test the hypothesis that Vav and phospholipase Cgamma2 (PLCgamma2), two molecules involved in integrin signaling, are required for arthritis ..

..Several of these molecules were identified from low femtomole levels of protein loaded onto the gel. We identified Vav-2, a recently discovered guanosine nucleotide exchange factor that is expressed ubiquitously, as a substrate of the ..

..b>Vav was thought to be the guanine nucleotide exchange factor responsible for the activation of Rac, but recent evidence ..

..Here, we show that the C. elegans Rho/Rac-family guanine nucleotide exchange factor, VAV-1, which is homologous to the mammalian Vav proto-oncogene, has a crucial role in all three behaviors...

..It has been demonstrated that 6-thio-GTP, a metabolite of azathioprine, specifically inhibits Vav1-Rac activity in T lymphocytes. Here we show the immunosuppressive efficacy of 6-thio-GTP in the prevention of cardiac allograft rejection...

This study investigates whether the guanine nucleotide exchange activity of Vav is linked to cytokine production in mast cells...

As Oslo Vann og Avløpsetaten (VAV, meaning Water and Sewage Department) looks into the future, it is faced with a quandary-to replace old pipelines or to continue maintaining them. The primary goal is to improve the level of service...

..The results of the present study strongly indicate that EHD2 regulates trafficking from the plasma membrane by controlling Rac1 activity...

b>Vav guanine nucleotide exchange factors (GEFs) have been implicated in cell adhesion by integrin and immune response receptors through the regulation of Rho GTPases...

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..These in vitro and in vivo studies have led to a better understanding of Nef's mechanism of action, although there still exists discord as to the contribution of Nef-mediated disturbance of thymopoiesis in the pathogenesis of AIDS...

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..This Nef-mediated exclusion is associated with failure of ubiquitination of activated Vav. In the presence of Nef, lipid raft Cdc42 is activated and forms a ternary complex between the c-Cbl-interacting ..

..Our data support a central role for Vav1 in determining the cytotoxic activity of NK cells and provide insight into the molecular mechanism of the integration of positive and negative signals during lymphocyte activation...

..We conclude that VAV1 plays a central role in controlling central nervous system immune-mediated disease and proinflammatory cytokine production critical for disease pathogenesis...

..For that purpose, different GEF activity mutants of Vav and of Bcr-Abl were constructed and stably transfected in Ba/F3 cells...

..We identify a key role for phospholipase C-gamma2 (PLCgamma2), Vav, B cell linker, and Bruton's tyrosine kinase in the formation of highly coordinated "microsignalosomes," ..

..Bcl-2 in selected hematopoietic cells were used: (a) overexpression of Bcl-2 in all hematopoietic cells using a vav promoter (Vav-Bcl-2) and (b) overexpression of Bcl-2 in all Major histocompatibility complex (MHC) class I cells (H-..

..Thus, our data open perspectives for new therapeutic strategies by revealing a mechanism of regulation of ALCL cell growth through Cdc42...

b>Vav proteins are guanine-nucleotide exchange factors implicated in leukocyte functions by relaying signals from immune response receptors and integrins to Rho-GTPases...

..Together, our data suggest an unexpected role of 3BP2 in endocytic and cytoskeletal regulation through its interaction with CIN85 and HIP-55...

Oslo Vann og Avløpsetaten (Oslo VAV)-the water/wastewater utility in the Norwegian capital city of Oslo-is assessing future strategies for selection of most reliable materials for wastewater networks, taking into account not only ..

..The G306E mutant does, like WT c-Cbl, co-immunoprecipitate with Vav, Slp-76, and p38. But unlike WT c-Cbl, does not cause MAPK signaling...

..Since Vav1 is an essential molecule for T-cell activation, the data suggest that ERK signaling is required for T-cell activation partly by inhibiting activation-induced proteolysis of Vav1...

..Our data suggest that Vav1 might function as a repressive adaptor of talin that must dissociate from alpha4beta1-talin complexes for efficient integrin activation...

..Vav1 and RasGRF2 are GDP/GTP exchange factors for Ras superfamily GTPases with roles in the development and/or effector functions of T-lymphocytes...

The Vav family of Rho-guanine nucleotide exchange factors (GEFs) is thought to control a diverse array of signaling pathways emanating from antigen receptors in lymphocytes, although the exact mechanism by which Vav exerts its function ..

..Protection from cell-mediated autoimmunity was not due to a Th2 bias, to the lack of IL-2 or a failure of Vav1(-/-) T cells in terms of chemotactic mobility...

..Thus, our data suggest that the interaction of Vav1 and Ly-GDI creates a fine tuning mechanism for the regulation of intracellular signaling pathways leading to NFAT stimulation...

Nef, a multifunctional HIV protein, activates the Vav/Rac/p21-activated kinase (PAK) signaling pathway...

..acid region near the N-terminus of the two largest products was found to have homology to a domain shared by Bcr, Vav, Dbl and CDC24...

..of proto-Dbl and compare with the corresponding regions of other members of Dbl-family proteins such as proto-Vav. We will identify the inhibitory mechanism for proto-Dbl and search for a proto-Dbl inhibitor...

..signals to distinct fates in T cells must operate upstream of Bim, Calcineurin and Erk, yet downstream of CD3, LAT, VAV and other molecules required of CD3, LAT, VAV and other molecules required Calcineurin for both positive and ..

..Studies will be performed to determine the roles of Jak kinases and the vav proto-oncogene product on the activation of the Rac1/p38 pathway in BCR-ABL expressing cells and to define the role ..

..also demonstrated that LFA-1-triggered, PI3-kinase- dependent activation of the guanine nucleotide exchange factor Vav-1 is involved, consequently activating the Rho family GTPases Rac1 and 2 which, through as yet uncharacterized ..

..also demonstrated that LFA-1-triggered, PI3-kinase- dependent activation of the guanine nucleotide exchange factor Vav-1 is involved, consequently activating the Rho family GTPases Rac1 and 2 which, through as yet uncharacterized ..

..Specific Aim 4 will determine the contribution of the pleckstrin homology (PH) domain to Dbl family protein (Vav) signaling and transformation...

..The K protein is a highly interactive molecule that binds RNA and DNA, interacts with protein tyrosine kinases and Vav, and regulates c-myc promoter activity...

..The Vav family of proteins contains multiple modular domains including a guanine nucleotide exchange factor (GEF) domain ..

..Therefore, we hypothesized that the GEF Vav as a target signaling molecule of Hcys activates Rac- NOX and thereby triggers the cascade of glomerular injury and ..

..Major accomplishments of the past 4 years were to 1) demonstrate that Vav proteins, exchange factor for Rho GTPase family members are required for several Mac-1 and Fc?R mediated adhesive ..

..Therefore, we hypothesized that the GEF Vav as a target signaling molecule of Hcys activates Rac- NOX and thereby triggers the cascade of glomerular injury and ..

..induced transformation in primary hematopoietic stem and progenitor cells results in constitutive activation of GEF Vav/Rho GTPase Rac pathway and that genetic disruption of hematopoietic specific Vav1 and/or Rac2 in mice abrogates ..

..induced transformation in primary hematopoietic stem and progenitor cells results in constitutive activation of GEF Vav/Rho GTPase Rac pathway and that genetic disruption of hematopoietic specific Vav1 and/or Rac2 in mice abrogates ..

..dimerization of the PRLr induces the association, tyrosine phosphorylation, and activation of members of the Vav family (Vav1-3) of guanine nucleotide exchange factors (GEF), an event necessary for PRL-driven cellular signaling ..

..induced transformation in primary hematopoietic stem and progenitor cells results in constitutive activation of GEF Vav/Rho GTPase Rac pathway and that genetic disruption of hematopoietic specific Vav1 and/or Rac2 in mice abrogates ..

The protooncoprotein Vav, a key regulator of lymphocyte signal transduction pathways, is a guanine nucleotide exchange factor (GEF) for Rho GTPases...

..the pathway through quantitative phosphoproteomic analysis of T cells with disrupted pathway proteins LCK, PLC1, VAV, and ERK...

..Furthermore, we have developed a novel preparation to measure calcium dynamics in vivo. Previously, we found that VAV-1, a highly evolutionarily conserved guanine nucleotide exchange factor for the Rho Family GTPases, regulates ..

..Our preliminary studies have revealed that Vav and Ephexin family RhoGEFs (Rho family GTPase guanine nucleotide exchange factors) are essential regulators of Eph-..

..Our preliminary studies have revealed that Vav and Ephexin family RhoGEFs (Rho family GTPase guanine nucleotide exchange factors) are essential regulators of Eph-..

..We have now generated transgenic mice expressing the mutated enzyme in the hematopoietic system driven by a vav gene promoter...

The Vav family proteins are thought to function as molecular adaptors and guanine-nucleotide exchange factors orchestrating signaling downstream of antigen receptors in lymphocytes...

DESCRIPTION: (Adapted from the investigator's abstract) The proto-oncogene, Vav, was first identified from esophageal carcinoma DNA in a screen for oncogenes that could transform fibroblasts...

b>Vav proteins are guanine nucleotide exchange factors and molecular adaptors that play a key role in signal transduction of lymphocyte antigen receptors...

..that contains the molecular machinery which propagates TCR-dependent signals, activating AP-1 and NF-kappaB through Vav and protein kinase C-theta ( PKC-theta)...

..We have identified the guanine nucleotide exchange factor, Vav and the small GTPase Rac-1, as down-stream effector molecules in the signaling cascade from activated PI-3 K...

..The role of signaling molecules src, syk and vav in the Shwartzman reaction will be evaluated...