IndraLab
Statements
sparser
"Following Sdc4 binding to FN in the extracellular matrix, the Sdc4 cytoplasmic domain binds phosphatidylinositol 4,5-bisphosphate, which stimulates PKCα activation, leading to the activation of small GTPases and assembly of focal adhesions (Oh et al., 1997; Saoncella et al., 1999; Couchman, 2003; Lim et al., 2003; Dovas et al., 2006)."
sparser
"In tetrapods (amphibians, reptiles, birds and mammals) there are 4 tenascin genes:
tenascin-C, tenascin-R, tenascin-W and tenascin-X ( xref ). xref Tenascin-C is the original “tenascin” that was first described independently in
the myotendinous junctions and brains of the chicken Gallus gallus xref as well as in
human glioblastoma-derived cells. xref The
best studied of the tenascins, tenascin-C is expressed by motile cells such as the neural
crest, at sites of connective tissue differentiation and in the adult in numerous stem cell
niches; it also reappears during inflammation, at the margins of healing wounds and in the
stroma of solid tumors. xref Tenascin-C from G. gallus binds to
α9β1 integrins via the isoleucine-aspartic acid-glycine (IDG) motif found in the
B-C loop of its third FNIII domain xref and to αVβ3 integrins via an RGD motif in the F-G loop of the same FNIII
domain. xref Tenascin-C can also bind
to fibronectin and prevent syndecan-4-fibronectin interactions, which in turn influences
fibronectin signaling through integrins. xref Tenascin-C knockout mice have profound behavioral
abnormalities and other phenotypes that are primarily associated with aberrant stem cell
migration, proliferation and differentiation. xref Tenascin-R, the second tenascin to be discovered, is restricted
in its expression to the nervous system xref and tenascin-R knockout mice also display abnormal behavior. xref Tenascin-W is often co-expressed with
tenascin-C both in development and in stem cell niches. xref Murine tenascin-W has an RGD motif in the F-G loop of the second
FNIII domain that appears to act as an α8β1 integrin-binding site. xref It and the tenascin-W of other species
have the related lysine-glycine-aspartic acid (KGD) motif in the F-G loop of one or more
FNIII domains, and synthetic peptides that contain this motif and neighboring conserved
sequences promote cell proliferation. xref Tenascin-W knockout mice have not been analyzed."
reach
"Moreover, blocking of FN binding to Sdc4 with Tenascin-C (TEN) selectively impaired the ability of Wnt7a to stimulate the expansion of the Pax7 + / YFP - satellite stem cell pool on myofibers cultured for 42h (XREF_FIG) without any effect on Pax7 + / YFP + satellite myogenic cells (XREF_SUPPLEMENTARY)."
reach
"Following Sdc4 binding to FN in the extracellular matrix, the Sdc4 cytoplasmic domain binds phosphatidylinositol 4,5-bisphosphate, which stimulates PKCalpha activation, leading to the activation of small GTPases and assembly of focal adhesions (Oh et al., 1997; Saoncella et al., 1999; Couchman, 2003; Lim et al., 2003; Dovas et al., 2006)."
sparser
"The SDC4-α5β1 integrin mediated cell adhesion to fibronectin reduces tumor cell proliferation, whilst the tenascin-C-mediated inhibition of SDC4-fibronectin interaction and consequently the impaired fibronectin-induced signaling enhances the proliferation of glioblastoma cells [ xref ]."
reach
"When pulsatile forces were applied to magnetic beads coated with a fragment of fibronectin that binds heparan sulfate chains on syndecan-4, or to beads coated with antibodies toward the core protein of syndecan-4, there was a reduction in bead displacement upon sustained force application, suggesting a mechanical stiffening response."
sparser
"Syndecan-4 connects 2 important signaling pathways (proteoglycans in cancer and ECM–receptors interactions) and it has been reported that blocking interactions between syndecan-4 and fibronectin decreases focal adhesions in cells, leading to increased cell proliferation in tumors."
sparser
"Ruiz and colleagues [ xref ] and Lange and colleagues [ xref ] have associated triggering of glioma cell migration with a simultaneous mechanism of competitive inhibition of syndecan-4 binding of fibronectin and signalling by lysophosphatidic acid and platelet-derived growth factor (reviewed in [ xref ])."
sparser
"TN-C has been reported to compete with the binding site of fibronectin with syndecan-4, and this interaction with syndecan-4 partially abrogates the effects of this co-receptor, as well as attenuates the interaction of syndecan-4 with fibronectin, enhancing tumor cell malignancy."
sparser
"Since tenascin-C competed with syndecan-4 binding to fibronectin, it is possible that syndecan-4 is exclusively available as a coreceptor for growth factor receptors in the presence of tenascin-C. In summary, in addition to its role in regulating the inflammatory response, there is strong evidence that tenascin-C may also play a direct role in the control of growth factor signaling that promotes ECM synthesis."
sparser
"Furthermore, our ContourPlot analysis model enabled the exploration of ligand‒receptor interactions within tumour cells, AFCs and FCs. xref We identified several enriched pathways, including FN1–ITGA3, LAMB3–ITGA2 and FN1–SDC4, along the trajectory from tumour to AFC to fully transformed cells."
sparser
"Once again, cells were able to spread without PKCα engagement; however, for focal complexes to form, interaction of syndecan-4 with fibronectin to recruit PKCα-mediated Rac1 activation was required, as knock down or drug-mediated inhibition of this kinase failed to activate Rac1 and induce the maturation of focal complexes ( xref )."