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IndraLab
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"Once activated, Dvl inhibits beta-catenin phosphorylation, mediated by Axin [XREF_BIBR] A multiprotein " destruction complex " that includes, adenomatous polyposis coli (APC), axin andglycogen synthase kinase 3beta (GSK3beta), would target and degrade beta-catenin in the absence of Wnt signaling."
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"When considering the triangular relations among EZH2, E-cadherin and beta-catenin, we assumed that MALAT1 could promote the expression level of beta-catenin and, beyond that, increase the effectiveness of beta-catenin by inhibiting the expression level of E-cadherin and consequently decreasing the proportion of E-cadherin-binding beta-catenin."
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"Phosphorylation of beta-catenin by members of the SRC family reduces the association of beta-catenin with E-cadherin and alpha-catenin [XREF_BIBR, XREF_BIBR] increasing the levels of cytoplasmic beta-catenin and translocation to the nucleus, where it interacts with the TCF/LEF transcription factor, resulting on the activation of target genes [XREF_BIBR]."
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"In the presence of Wnt ligand, a receptor complex forms between Frizzled and LRP5/6, and Frizzled is recruited by Dvl which leads to LRP5/6 phosphorylation and Axin recruitment, which in turn disrupts Axin-mediated phosphorylation/degradation of β-catenin, allowing β-catenin to accumulate in the nucleus where it serves as a coactivator for T-cell factor (TCF) to activate Wnt-responsive genes [8,9]."
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"The data demonstrate that multivalent integrin engagement results in increased internalization of E-cadherin, inhibition of GSK-3beta, elevated levels of nuclear beta-catenin, increased beta-catenin-regulated promoter activation, and transcriptional activation of Wnt and beta-catenin target genes."
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"In the noncanonical Wnt pathway, Ca i +2 signals originating from G protein activity similarly initiate the phosphorylation and destabilization of beta-catenin, albeit in a GSK3beta independent manner, and also deplete nuclear beta-catenin and terminate its transcriptional activity."
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"GSK3beta is a significant cancer control molecule; it controls the degradation of beta-catenin by phosphorylating serine 33/37 of cytosolic beta-catenin, and it may also be involved in crosstalk with the APC, CK1, and Axin complex, which is important in cancer cell proliferation and metastasis 4-7."
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"Mechanistic studies reveal that Acp5 is upregulated by transforming growth factor-beta1 (TGF-beta1) in a TGF-beta receptor 1 (TGFbetaR1)/Smad family member 3 (Smad3)-dependent manner, after which Acp5 dephosphorylates p-beta-catenin at serine 33 and threonine 41, inhibiting the degradation of beta-catenin and subsequently enhancing beta-catenin signaling in the nucleus, which promotes the differentiation, proliferation and migration of fibroblast."
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"When Wnt is present, the axin mediated beta-catenin phosphorylation and degradation is disrupted, allowing beta-catenin to enter and accumulate in the nucleus, where it serves as a transcriptional coactivator for the TCF/LEF family of transcription factors and turns on Wnt responsive target genes."
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"In the absence of Wnt, beta-catenin is degraded by a multiprotein complex containing Disheveled (Dvl), GSK-3beta, Axin, adenomatous polyposis coli (APC), and casein kinase1alpha (CK1alpha), which phosphorylates beta-catenin and leads to its ubiquitination and proteasomal degradation [XREF_BIBR, XREF_BIBR]."
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"Although a previous report proposed that cross talk between the PI3K and WNT and beta-catenin pathways might be prohibited and WNT and beta-catenin-mediated transcriptional activity was not modulated by the activation of the PI3K and Akt pathway XREF_BIBR, our results showed that the oxidation resistant mutant of PTEN, PTEN-C71S, but not wild-type PTEN, as well as PI3K and Akt inhibitor and NAC treatment, reversed AIF knockdown induced expressions of WNT and beta-catenin signaling target genes, supporting that AIF regulates beta-catenin signaling through PTEN-PI3K and Akt pathway."
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"Furthermore, the Ctnnb1 K5-fx/fx thymic phenotype, including the decreased frequency of proliferating thymocytes (total, CD4 - CD8 - DN and CD4 + CD8 + DP; Figure XREF_FIG) and the increased percentage of annexin V labeled apoptotic cells (total and CD4 + CD8 + DP; Figure XREF_FIG), was significantly reversed by the transgenic expression of stabilized beta-catenin in K5 expressing cells."
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"Likewise, we found that wild-type beta-catenin was efficiently decreased in SNU475 and Hep3B cells by aplykurodin A whereas the amounts of mutant beta catenin lacking N-terminal region was largely unaffected in response to aplykurodin A, suggesting that N-terminal residues of beta-catenin are required for aplykurodin A mediated beta-catenin degradation."
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"Prevention of β-catenin degradation allows the cytoplasmic level of β-catenin to increase, causing increased translocation of β-catenin into the nucleus, which allows interaction with the TCF/LEF transcription factors leading to enhanced canonical Wnt target gene transcription [99]."
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"In addition, Wnt5a increased the nuclear beta-catenin level and treatment with imatinib or ionomycin, either of which blocks the beta-catenin pathway, reduced the anti-apoptotic activity of Wnt5a, together suggesting the simultaneous involvement of the beta-catenin-mediated pathway in the Wnt5a anti-apoptotic activity."
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"They showed in HEK293 cells and in human prostate and breast cancer cells, that niclosamide suppressed LRP6 expression and phosphorylation, blocked Wnt3A induced beta-catenin accumulation, and inhibited Wnt and beta-catenin signaling, resulting in induced apoptosis and anti-cancer activity with half maximal inhibitory concentration (IC 50) values less than 1 muM."
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"The present results demonstrated that CDC20 silencing led to a significantly decreased protein expression level of beta-catenin and c-Myc, and inhibited the translocation of beta-catenin into the nucleus, suggesting that CDC20 contributes to the development of cSCC through the Wnt and beta-catenin signaling pathway."
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"It was found that the PRRX1, p-GSK-3beta, beta-catenin, cyclinD1, N-cadherin and vimentin expressions were markedly abated, while the expression of GSK-3beta, p-beta-catenin, E-cadherin were significantly boosted in MKN-45 and MGC-803 cells transfected with the over-expressed miR-330-3p or under-expressed PRRX1 and vise vista, suggesting that miR-330-3p could inhibit the phosphorylation of GSK-3beta protein by regulating PRRX1 and promote the phosphorylation of beta-catenin to suppress the activation of Wnt and beta-catenin signal pathway, thus inhibiting the EMT of cells."
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"In the current study, we show for the first time that inhibition of M-cadherin expression by RNAi increases phosphorylation of beta-catenin on the N-terminus at Ser31/37/Thr41, decreases the protein abundance of unphosphorylated active beta-catenin, and impairs the myogenic induction that is caused by either inhibition of GSK-3beta activity or Wnt-3a treatment."
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"SBSN-2 in ESCC cell lines increased the activity of WNT and beta-catenin signalling pathway, which resulted in TCF/LEF transcriptional activity, nuclear translocation and reduced phosphorylation of WNT and beta-catenin, and increased transcript levels of WNT / beta-catenin signalling regulated genes such as AXIN2, MYC, CCND1, FRA1, MMP7 and JUN.."
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"Furthermore, the expression levels of Dax1 were also down-regulated when beta-catenin expression decreased in the cultured testis cells treated with quercetin (XREF_FIG and XREF_FIG) or DKK-1 (XREF_FIG and XREF_FIG), suggesting Dax1 is probably the downstream gene of beta-catenin."
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"Since GSK3 is a kinase within the beta-catenin destruction complex, which could phosphorylate Axin bound beta-catenin and the phosphorylated beta-catenin is then ubiquitinated and targeted for rapid destruction by the proteasome, preventing activation of beta-catenin target genes XREF_BIBR, XREF_BIBR, GSK3 can act as a negative regulator of beta-catenin."
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"In the Wnt signaling pathway, where the main target is beta-catenin, active GSK3beta phosphorylates beta-catenin at the N-terminal region and enhances beta-catenin degradation, thereby preventing the association of beta-catenin with nuclear transcription factors and activation of target gene expression such as cyclin D1 and c-myc."
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"We also found that these opposing effects on Wnt activation can be explained by the finding that HIF-1alpha depletion not only decreases the beta-catenin protein levels in cells and decreases the nuclear beta-catenin levels but also induces the sequestration of beta-catenin at the cell membrane by E-cadherin."
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"Both excessive and insufficient beta-catenin levels may impair the homeostasis of articular chondrocytes by enhancing pathological maturation and apoptosis, respectively; loss- and gain-of-functions of beta-catenin cause apoptosis at the center of the joint and chondrocyte maturation at the periphery, depending on the vascularity."
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"Prostaglandin E2 catalyzed by COX-2, in conjunction with G protein coupled receptors such as EP2, EP4 and LGR5, cause inactivation of glycogen synthase kinase 3beta to decrease the inhibitory phosphorylation of beta-catenin thereby enhancing beta-catenin and Wnt signaling to promote the stem like property of CSCs [XREF_BIBR - XREF_BIBR]."
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"In addition to directly phosphorylating beta-catenin on Y654 and Y142, FGF signaling can also directly activate beta-catenin signaling through the PI3K-AKT pathway, which acts to prevent beta-catenin degradation by inhibiting GSK-3beta, and by phosphorylating beta-catenin on Ser552, which helps to drive beta-catenin to the nucleus."
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"Several studies demonstrated that beta-catenin and TCF4 binds directly to the ZEB1 and Slug promoter and activates their transcriptions XREF_BIBR XREF_BIBR We observed nuclear accumulation of beta-catenin in TCTP overexpressing LLC-PK1 cells using subcellular fractionation and immunofluorescence techniques (XREF_FIG), and diminished nuclear beta-catenin in TCTP downregulated melanoma cells (XREF_FIG)."
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"Niclosamide and silibinin inhibit LRP6 expression and phosphorylation, block Wnt3a induced beta-catenin accumulation, and inhibit Wnt and beta-catenin signaling in HEK293 cells, prostate cancer PC-3 and DU145 cells, and breast cancer MDA-MB-231 and T-47D cells [XREF_BIBR, XREF_BIBR]."
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"Here, we report that a long form of cFLIP (cFLIP-L) inhibits beta-catenin ubiquitylation and increases endogenous cytosolic beta-catenin, which results in translocation of beta-catenin into nuclei and induction of beta-catenin-dependent gene expression in cFLIP-L-expressing cells."
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"Wnt signaling is suggested to inhibit beta-catenin phosphorylation, thus inducing the accumulation of cytosolic beta-catenin, which associates with the TCF/LEF (T cell factor and lymphocyte enhancer factor) family of transcription factors to activate Wnt and beta-catenin-responsive genes [XREF_BIBR - XREF_BIBR]."
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"These results suggest that the anti-carcinogenetic effects of supplemental calcium and vitamin D 3 may, in part, depend on the ability of these agents to favorably modulate the expression of APC, beta-catenin, and E-cadherin and thus, possibly, inhibit proliferative beta-catenin signaling."
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"The in vitro results indicate that stimulation of the CaSR, by Ca (2+) or by the calcimimetic R-568, produced a striking and time dependent decrease in the phosphorylation of beta-catenin at Ser 552 and Ser 675, two amino acid residues that promote beta-catenin transcriptional activity."
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"Another interesting finding was that Gsk3b, which leads to phosphorylation of beta-catenin and stimulates beta-catenin degradation was lower in CKD animals fed 0.6% phosphate than those fed 1.2% phosphate diet, again suggesting that dietary phosphate is involved in the regulation of Wnt and beta-catenin signaling."
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"We reasoned that a SFK inhibitor, which prevents phosphorylation of beta-catenin tyrosine residues, might block the dissociation of the cadherin and catenin complex and increase the extent of membrane localization of beta-catenin, thus inducing epithelial differentiation of hPSCs."
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"Binding of Wnt to the Frizzled receptor blocks phosphorylation of beta-catenin by glycogen synthase kinase 3 (GSK3), allowing beta-catenin to accumulate and translocate to the nucleus where it binds to TCF/LEF (T-cell factor and lymphoid enhancer factor) transcription factors to modulate expression of target genes [XREF_BIBR]."
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"In the presence of Wnt signaling, the binding of LRP5/6 and FZD inhibits the activity of the Axin complex and the phosphorylation of beta-catenin, allowing beta-catenin to enter the nucleus, and then bind to TEF and TCF to form a complex, which then recruits cofactors to initiate downstream gene expression."
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"Major et al. demonstrated that APC membrane recruitment 1 (Amer1), also known as WTX (Wilms ' tumor suppressor X chromosome), formed a complex with beta-catenin and APC (adenomatous polyposis coli) to promote beta-catenin ubiquitination and degradation, which antagonized the Wnt and beta-catenin signaling pathway [XREF_BIBR]."
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"In the absence of Wnt ligand, β-catenin is usually degraded by the proteosome system including axin, glycogen synthase kinase 3 beta (GSK3β), and casein kinase 1, while binding of Wnt to a frizzled receptor blocks the activity of destruction complex to degrade β-catenin in the presence of Wnt ligand and so β-catenin is translocated into nucleus [13]."
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"GSK-3β inhibitors antagonize β-catenin phosphorylation and degradation, allowing β-catenin to then accumulate in the nucleus and propagate Wnt signals.As such, organoids were incubated in control media for 7 days and 24 h after switching the media to NC/HC they were incubated in the presence or absence of the GSK-3β inhibitor CHIR99021 (CHIR, 20nM)."
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"Consistently, in vitro phosphorylation and binding assays demonstrated that Src can directly phosphorylate p120 and beta-catenin with markedly different outcomes : while beta-catenin phosphorylation at Y654 reduced beta-catenin affinity for an E-cadherin cytosolic domain, p120 phosphorylation increased E-cadherin binding [XREF_BIBR]."
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"Kaur et al. demonstrated ALCAM expression in OSCC and correlated with E-Cadherin and beta catenin expression by IHC and concluded that there is a significant loss of E-cadherin and beta-catenin membrane expression in relation to ALCAM expression in early precancerous stage (dysplasia), their sustained deregulation in OSCCs and correlation with aggressive tumor behaviour and poor prognosis, underscoring their potential as candidate biomarkers for disease prognosis."
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"Moreover, betacatenin expression was significantly reduced in both compartments in response to SP600125 (p < 0.01), further supporting that the release from 14-3-3sigma directs cytoplasmic betacatenin towards degradation, concurrently precluding betacatenin nuclear import even in the presence of activated BCR-ABL1 TK."
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"Mechanism analysis revealed that the Wnt/β-catenin pathway was activated by up-regulating the expression of β-catenin and inhibiting the protein degradation of β-catenin in NSE-overexpressing SCLC cells, and played a key role in promoting EMT, migration and invasion of SCLC cells."
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"The tyrosine (Tyr) phosphorylation of VE-cadherin has been reported to cause a loss of the ability of VE-cadherin to bind beta-catenin, while the Tyr phosphorylation of beta-catenin has been demonstrated to decrease the affinity of beta-catenin for the cadherin and increase its turnover at junctions."
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"By co-treating cells with cycloheximide and MG-132, we proved that CANA promoted proteasomal degradation of beta-catenin protein by increasing phosphorylation of beta-catenin, and CANA-induced inactivation of protein phosphatase 2A was identified being responsible for this effect."
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"Quercetin treatment in these TNBC cells induced morphological alterations, DNA fragmentation, and caspase-3 activation, in addition to decreased protein expression of lipogenic enzyme FasN, anti-apoptotic Bcl-2, β-catenin, and reduced nuclear accumulation of β-catenin, indicating a quercetin-mediated inhibition of the Wnt/β-catenin signaling in TNBCs [177]."