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"The Wnt and beta-catenin signaling pathway, also known as the canonical Wnt pathway, inhibits the phosphorylation and degradation of beta-catenin, which accumulates in the cytoplasm and translocates into the nucleus, where it binds to transcription factors (ternary complex factor and lymphoid enhancer factor 1, TCF and LEF1) and regulates the expression of a number of targeted genes."
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"Figure 1A and B showed that an ox-LDL-stimulated β-catenin activation in NRK-52E cells, as revealed by up-regulation of phosphorylated (Ser675) β-catenin and down-regulation of phosphorylated (Ser33/37) β-catenin in a dose and time dependent manner.3.2
FXR activation improves ox-LDL-mediated tubulo-interstitial fibrosis."
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"In the absence of Wnt ligand, a beta-catenin destruction complex, composed of Axin, glycogen synthase kinase 3 (GSK3), casein kinase I alpha (CKIalpha), and the tumor suppressor adenomatous polyposis coli (APC), promotes phosphorylation of beta-catenin, targeting it for ubiquitin mediated proteasomal degradation."
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"This process is initiated by the β-catenin destruction complex, a multiprotein complex composed of the scaffold proteins adenomatous polyposis coli (APC) and Axin1 [109–112] the protein kinases casein kinase 1 (CK1) and glycogen synthase kinase-3 (GSK3), which phosphorylate β-catenin on key serines/threonines [113–115]."
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"In the absence of Wnt ligand, β -catenin may be phosphorylated by the β -catenin destruction complex composed of Axin, glycogen synthase kinase 3 β (GSK3 β ), casein kinase 1 α (CK1 α ), and adenomatous polyposis coli (APC) and subsequently degraded by the E3 ligase β -TrCP [ xref ]."
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"Mutations in exon 3 of the CTNNB1 gene that prevent phosphorylation and degradation of beta-catenin, a component of the adherens junction and a mediator of Wnt signalling pathway have been identified in adamantinomatous craniopharyngiomas and are possibly implicated in their pathogenesis."
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"In the absence of Wnt ligand binding, the β-catenin destruction complex, composed of the scaffold proteins Adenomatosis Polyposis Coli and Axin (Axn), together with the protein kinases Casein-kinase 1α and Glycogen Synthase Kinase 3, phosphorylates the transcriptional cofactor β-catenin (Armadillo/Arm in Drosophila), leading to its degradation in the cytoplasm."
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"This further supported the notion that the alterations caused by MIR3607 were mediated by the overactivation of β-catenin signaling.A major repressor of Wnt/β-catenin signaling is APC, a key component of a protein complex that phosphorylates β-catenin, driving it for proteasome degradation."
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"In the absence of Wnt ligand binding, the β-catenin destruction complex, composed of the scaffold proteins Adenomatosis Polyposis Coli and Axin (Axn), together with the protein kinases Casein-kinase 1α and Glycogen Synthase Kinase 3, phosphorylates the transcriptional cofactor β-catenin (Armadillo/Arm in Drosophila), leading to its degradation in the cytoplasm."
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"In normal cells the degradation of β-catenin is regulated by Wnt signaling: β-catenin is constitutively phosphorylated by the β-catenin destruction complex, which marks β-catenin for ubiquitination followed by rapid proteasomal degradation ( xref ; xref ); Wnt signaling inactivates the β-catenin destruction complex, thereby inhibiting phosphorylation of β-catenin and consequently ubiquitination and degradation of the protein ( xref ; xref )."
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"In short, when the Wnt/β-catenin signaling is not activated, the destruction complex that consists of casein kinase 1 (CK1ε), Axin, dishevelled (Dvl), adenomatous polyposis coli (APC), and glycogen synthase kinase-3β (GSK3β) sequesters β-catenin in the cytoplasm, phosphorylating β-catenin for degradation [ xref ]."
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"In the absence of Wnt ligands, a complex between Axin, adenomatous polyposis coli (APC) tumor suppressor protein, casein kinase (CK) 2, glycogen synthase kinase (GSK) 3beta, and beta-catenin causes the phosphorylation of beta-catenin by GSK3beta and targets it for subsequent degradation by the proteasome XREF_BIBR, XREF_BIBR (XREF_FIG)."
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"In the OFF state, or in the absence of extracellular Wnt ligands, cytoplasmic β-catenin is sequentially phosphorylated by the β-catenin destruction complex (DC) composed of casein kinase 1a (CK1), glycogen synthase kinase 3 (GSK-3), the scaffold protein axin, and the tumor suppressor adenomatous polyposis coli (APC)."
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"If Wnt signaling is activated, beta-catenin degradation is inhibited due to the decreased ability of GSK3beta to phosphorylate beta-catenin and beta-catenin translocates into the nucleus to transactivate the Tcf/Lef transcription factor, leading to the upregulation of many genes responsible for cell proliferation.Activated beta-catenin and Tcf signaling by the accumulation of betacatenin in the cells has been implicated in human carcinogenesis."
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"Phosphorylation of beta-catenin by GSK3beta targets beta-catenin for ubiquitination and proteosome mediated degradation [XREF_BIBR - XREF_BIBR], which occurs within a large complex that involves Axin, the product of the adenomatous polyposis coli (APC) gene, protein phosphatase 2A, GSK3beta, and beta-TrCP [XREF_BIBR, XREF_BIBR]."
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"Gastrin significantly increased intestinal polyposis, but combination of PPI and gastrin markedly attenuated intestinal polyposis compared to gastrin promoted APCMin/+ mice (P <.001), in which significant beta-catenin phosphorylation and inhibition of beta-catenin nuclear translocation were observed with PPI alone or combination of PPI and gastrin, whereas gastrin treatment significantly increased beta-catenin nuclear translocation."
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"We found that LGK974 downregulated phosphorylation of the WNT co-receptor LRP6 and in parallel triggered the accumulation of Axin1, a member of the beta-catenin destruction complex, which with APC promote, the ubiquitin dependent proteasomal degradation of beta-catenin via CK1alpha- and GSK3beta mediated phosphorylation of beta-catenin XREF_BIBR - XREF_BIBR."
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"Since GSK3 is a kinase within the β-catenin destruction complex, which could phosphorylate Axin-bound β-catenin and the phosphorylated β-catenin is then ubiquitinated and targeted for rapid destruction by the proteasome, preventing activation of β-catenin target genes xref , xref , GSK3 can act as a negative regulator of β-catenin."
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"Relatedly, activated beta-catenin has been shown to be up-regulated in the nuclei of myofibroblasts of fibroblastic foci of IPF patients [XREF_BIBR], and alveolar epithelial responses to TGF-beta involve alpha3 integrin for beta-catenin phosphorylation and formation of a beta-catenin and p-Smad 2 complex resulting in initiation of EMT [XREF_BIBR]."
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"In the OFF state, or in the absence of extracellular Wnt ligands, cytoplasmic beta-catenin is sequentially phosphorylated by the beta-catenin destruction complex (DC) composed of casein kinase 1a (CK1), glycogen synthase kinase 3 (GSK-3), the scaffold protein axin, and the tumor suppressor adenomatous polyposis coli (APC)."
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"In normal cells the degradation of beta-catenin is regulated by Wnt signaling : beta-catenin is constitutively phosphorylated by the beta-catenin destruction complex, which marks beta-catenin for ubiquitination followed by rapid proteasomal degradation; Wnt signaling inactivates the beta-catenin destruction complex, thereby inhibiting phosphorylation of beta-catenin and consequently ubiquitination and degradation of the protein."
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"Kolegraff et al xref xref demonstrated that down-regulation of DSC2 activated the EGFR/Akt pathway, which caused the accumulation of phosphorylated β-catenin in the nucleus and phosphorylated β-catenin could activate the downstream target genes, resulting in the abnormal proliferation and invasion of tumor cells."
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"Wnt/β-catenin signaling pathway was also examined by analyzing the expression of total β-catenin and phosphorylated β-catenin in cytoplasm, and the results showed that the growth inhibitory effects of oxymatrine treatment on MCF-7 cells may be due to the inhibition of SP and Wnt/β-catenin signaling pathway."
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"The key components of this destruction complex include the scaffold protein Axin, beta-catenin binding protein adenomatous polyposis coli, protein kinases casein kinase (CK) 1 alpha and delta and glycogen synthase kinase-3 (GSK-3alpha and beta) that continuously phosphorylate beta-catenin."
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"Given the critical role of GSK3β in the regulation of the stability of β-catenin by phosphorylation on S33/S37/T41, we examined whether β-catenin isoforms, phosphorylated by GSK3β, are increased in HBL.No detectable phosphorylation of β-catenin on S33/S37/T41 residues was found in either the background or tumor sections (Figure 1C, Supplementary Figure S9)."
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"Mutations in APC or beta-catenin lead to dissociation of the complex, causing the accumulation of nonphosphorylated beta-catenin, which translocates to the nucleus and acts as a transcriptional coactivator of TCF transcription factors (Kinzler and Vogelstein, 1996; Bienz and Clevers, 2000)."
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"Analysis of nuclear β-catenin fluorescence intensity demonstrated that latrunculin treatment increased β-catenin fluorescence intensity of both total and nonphosphorylated β-catenin by ∼50% (48.6 ± 23.7% and 45.9 ± 10.2%, respectively), while jasplakinolide treatment did not alter nuclear staining intensity (Fig. 7, A and B)."
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"This recruitment inactivates the beta-catenin destruction complex, which is conformed by protein Axin, tumor-suppressor adenomatous polyposis coli gene product (APC), CK1, and GSK3beta, thus preventing beta-catenin phosphorylation by GSK3 and consequently, its proteasomal degradation."
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"We explored whether the AKT/ β-catenin axis mediated the effects of miR-708.First, we found that SPHK2 overexpression increased phosphorylated Akt, phosphorylated GSK3-β and β-catenin levels, whereas SPHK2 inhibition decreased phosphorylated Akt, phosphorylated GSK3-β, and β-catenin levels in glioma cells (Fig. 6a)."
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"XREF_FIG C, bottom panel, shows that, EGF stimulation of HA tagged beta-catenin led to a similar level of Tyr 654 phosphorylation of beta-catenin; however, co-stimulation with IL-2 led to disruption of interactions between HA tagged beta-catenin and Hif1alpha, which were reversed by mutation of Jak3 mediated phosphorylation sites (Y30F, Y64F, Y86F) in beta-catenin (XREF_FIG C, top panel)."
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"In addition, beta-catenin oncogenic mutations have been reported in approximately 10% of colorectal cancer patients, and these missense or deletion mutations are located at beta-catenin sites where GSK3beta normally phosphorylates beta-catenin, leading to stable beta-catenin translocation into the nucleus for Wnt activation [XREF_BIBR, XREF_BIBR]."
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"In the absence of Wnt ligands, a complex between Axin, adenomatous polyposis coli (APC) tumor suppressor protein, casein kinase (CK) 2, glycogen synthase kinase (GSK) 3β, and β-catenin causes the phosphorylation of β-catenin by GSK3β and targets it for subsequent degradation by the proteasome xref , xref ( xref )."
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"Wnt and beta-catenin pathway, also termed the canonical Wnt pathway, is activated upon the binding of Wnt ligands to a dual receptor complex comprising low-density lipoprotein receptor related protein 5 or 6 (LRP5/6) co-receptors and the frizzled receptor at the cell membrane, causing the suppression of glycogen synthase kinase-3beta (GSK3beta) activity and preventing phosphorylation of beta-catenin and its proteosomal degradation."
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"Interaction of WNT and FZ/LRP receptors promotes hyperphosphorylation of DVL, and inhibits the beta-catenin degradation complex made up of adenomatous polyposis coli (APC), GSK3beta and the scaffold protein AXIN1, effectively blocking phosphorylation and degradation of cytoplasmic beta-catenin."