... demonstrating how exposure of tumor cells to isolation stress upregulates the G-protein-coupled receptor lysophosphatidic acid receptor 4 (LPAR4), its downstream target fibronectin and two fibronectin-binding integrins, α5β1 and αvβ3. These responses create a fibronectin-rich niche for tumor cells, ultimately...

...Georgina P. Coló; Andrea Seiwert; Raquel B. Haga ABSTRACT Fibronectin (FN)-binding integrins control a variety of cellular responses through Rho GTPases. The FN-binding integrins, αvβ3 and α5β1, are known to induce different effects on cell morphology and motility. Here, we report that FN-bound...

... of Δ133p53 isoforms leads to changes in gene expression of the extracellular matrix molecules fibronectin (FN), EDA + -FN, laminin α5 and laminin α3 in human breast epithelial cells. These changes resulted in increased actin stress fibers and enhanced migratory behavior of cells in two-dimensional culture...

...Darshika Tomer; Cecilia Arriagada; Sudipto Munshi; Brianna E. Alexander; Brenda French; Pavan Vedula; Valentina Caorsi; Andrew House; Murat Guvendiren; Anna Kashina; Jean E. Schwarzbauer; Sophie Astrof ABSTRACT Fibronectin (Fn1) fibrils have long been viewed as continuous fibers composed...

... Cellular fibronectin (FN; also known as FN1) variants harboring one or two alternatively spliced so-called extra domains (EDB and EDA) play a central bioregulatory role during development, repair processes and fibrosis. Yet, how the extra domains impact fibrillar assembly and function of the molecule...

...) and fibronectin (Fn), which are often presented to cells in culture as homogenous substrates. However, in tissues, cells experience highly complex and changing environments. To better understand integrin ligand selection in such complex environments, we employed binary-choice substrates of Fn and Vn to dissect...

... the presence of fibronectin on the sperm surface, its role in sperm–sperm interaction as well as participation of β-integrin in the activation of ERK2. Our results show that the signaling pathway downstream of fibronectin, via integrin, FAK, Grb2, MEK1/2, ERK2, GEF-H1 and RhoA regulates the actin...

...Carolina Diaz; Stefanie Neubauer; Florian Rechenmacher; Horst Kessler; Dimitris Missirlis ABSTRACT The major fibronectin (FN)-binding α 5 β 1 and α v β 3 integrins exhibit cooperativity during cell adhesion, migration and mechanosensing, through mechanisms that are not yet fully resolved...

... and effects on cell proliferation. On fibronectin, GFP-tagged β1A integrin showed dynamic exchange in peripheral focal adhesions, and long, central fibrillar adhesions. In contrast, GFP–β1D integrins exchanged slowly, forming immobile and short central adhesions. While adhesion recruitment of GFP–β1A integrin...

... lamellipodia in cells plated on a fibronectin substrate. By using a novel optotaxis assay, we show that biased activation can drive directional migration. Interestingly, in the absence of exogenous fibronectin, Rac activation is insufficient to produce stable lamellipodia or directional migration whereas Cdc42...

... expression inhibited the interaction between integrins and fibronectin, and induced cell morphological changes and proliferation. Inhibition of integrin and fibronectin binding by treatment with the cyclic RGD peptide and fibronectin knockdown induced tubular formation in the presence of EGF alone...

... progression, the relative abundance of fibronectin receptors, including integrins α5β1 and αvβ3, changes, thus altering the integrin composition of cell–matrix adhesions. Here, we show that enhanced αvβ3 expression can fully compensate for loss of α5β1 and other β1 integrins to support outside-in and inside...

.... TGF-β and hypoxia, two cues that initiate injury-induced fibrosis, caused human kidney cells to develop a mesenchymal phenotype, including increased fibronectin expression and secretion. However, upon hypoxia, assembled extracellular fibronectin fibrils were mostly absent, whereas treatment with TGF-β...

...Anthony Ambesi; Paula J. McKeown-Longo ABSTRACT The fibronectin matrix plays a crucial role in the regulation of angiogenesis during development, tissue repair and pathogenesis. Previous work has identified a fibronectin-derived homophilic binding peptide, anastellin, as an effective inhibitor...

... cell–cell junctions rich in zona occludens (ZO)-1, β-catenin and heparan sulfate, required syndecan-4 but not fibronectin or protein kinase C α (PKCα) to assemble extracellular matrix (fibrillin microfibrils and perlecan). In contrast, RPE cells that strongly expressed mesenchymal smooth muscle α-actin...

... cell niche, in nearby trabeculae and along the glassy membrane. Tenascin-W is also found in the neural stem cell niche of nearby hair follicles. The formation of stress fibers and focal adhesion complexes in CD34-positive whisker-derived stem cells cultured on fibronectin was inhibited by both tenascin...

... parameters of the ECM that control FA assembly and force transduction in non-migrating cells, we used fibronectin (FN) nanopatterning within a cell adhesion-resistant background to establish the threshold area of ECM ligand required for stable FA assembly and force transduction. Integrin–FN clustering...

... and during mesenchymal stem cell differentiation. In particular, we focus on the main ECM protein fibronectin, its temporal expression pattern during chondrogenic differentiation, its potential effects on functions of differentiating chondrocytes, and how its interactions with other ECM components might...

... (MT1-MMP) Planar cell polarity Gastrulation Fibronectin Migration It has been a decade since homologues of fly planar cell polarity (PCP) genes were shown to be required for convergence and extension movements during frog and fish gastrulation ( Djiane et al., 2000 ; Wallingford et al...

... mesenchymal gene, fibronectin ( FN1 ), both in epithelial cells undergoing EMT and in fibroblasts. Together with Snail1, the p65 subunit of NF-κB and PARP1 bound to the FN1 promoter. We detected nuclear interaction of these proteins and demonstrated the requirement of all three for FN1 transcription. Moreover...