IndraLab
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"Together, these observations demonstrate the existence of a novel transmembrane receptor partner for the GDNF and GFRalpha1 complex and uncover an unexpected interplay between GDNF-GFRalpha1 and HGF-MET signaling in the early diversification of cortical GABAergic interneuron subtypes."
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"Although the direct interaction of GDNF with the GFRalpha-1 and NCAM co-receptors may not be the only method to activate Fyn, this study does demonstrate that GDNF promotes SC differentiation via a Fyn dependent mechanism, either through GDNF binding with GFRalpha-1 and NCAM or homophilic binding of NCAM."
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"Some trace residues had been proved to be important in ligand-receptor binding, especially in rat GFRalpha1, where alanine scanning mutagenesis confirmed that sites N (152) N (153), R (259), S (316) N (317) S (318) and Q (247) D (248) S (249) were critical for GFRalpha1 binding to GDNF or Ret and thus affected the formation of GDNF, GFRalpha1, and Ret complex."
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"Disruption of the niche or related signaling leads to stem cell loss. xref , xref The niche aging in the ovary is associated with the decline in ovarian reproductive function. xref – xref CADHERIN-22, a member of the cadherin superfamily, promotes FGSC self-renewal through interaction with the JAK and β-CATENIN. xref Meanwhile, CADHERIN-22 enhances PI3K-AKT3 signaling, thus, upregulating the expression of N-MYC and CYCLIN, and GDNF-GFRA1 activates AKT3 via PI3K or SFK, subsequently promoting self-renewal of FGSCs. xref GSK3 inhibitor BIO promotes proliferation of FGSCs through activation of β-CATENIN and E-CADHERIN, xref indicating an important role of GSK3 signaling in FGSCs proliferation."
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"XREF_BIBR, XREF_BIBR It has been shown that the GDNF and GFRalpha1 complex can activate not only the canonical GDNF receptor Ret, a receptor tyrosine kinase which signals through the sarcoma protein (Src)/rat sarcoma (Ras)/mitogen-activated protein kinase (MAPK), phosphatidylinositol-4,5-bisphosphate 3-kinase (PI3K)/Akt, NF-kappaB (nuclear factor ' kappa-light-chain-enhancer ' of activated B cells), JNK (c-Jun N-terminal kinases) and PLCgamma (phospholipase gamma) pathway, but also with other signaling inducing receptors."
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"Activation of the GDNF pathway is initiated via the ligation of GDNF to its co-receptor, GDNF family receptor alpha1 (GFRalpha1), which is a glycosylphosphatidylinositol (GPI)-linked membrane associated protein, and the recruitment of Ret to the GFRalpha1 and GDNF complex (XREF_FIG)."
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"Ret (rearranged during transformation) and the 140 kDa isoform of NCAM (neural cell adhesion molecule) have each been identified as receptors that can bind to the GDNF and GFRalpha1 complex and induce subsequent intracellular signaling, primarily via the PI3K and Akt and/or MEK and Erk MAPK pathways."
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"Formation of the GDNF-GFRα1 signaling complex leads to the autophosphorylation of Ret and the subsequent activation of downstream signaling cascades, such as the mitogen-activated protein kinase (MAPK), phosphoinositide 3-kinase and phospholipase Cγ/protein kinase C pathway ( xref ; xref )."
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"Branching morphogenesis begins with the interaction between the metanephric mesenchyme and the ureteric bud, whereby inductive signals from both embryonic derivatives (GDNF is released from the metanephric mesenchyme and binds to its receptors c-RET and GFRalpha1 at the tips of the ureteric bud) initiate the branching process [XREF_BIBR, XREF_BIBR, XREF_BIBR, XREF_BIBR, XREF_BIBR]."
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"The GDNF–GFRα1 complex then binds the RET [ xref , xref ] present on neuronal cell bodies and terminals of several different pathways, such as nigro–striatal dopaminergic neurons [ xref , xref ], spinal motor neurons [ xref ], noradrenergic neurons of the locus coeruleus [ xref ], enteric neurons [ xref ], and sensory neurons [ xref ]."
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"As expected, the positive controls (GDNF in GFRalpha1-RET and soluble GFRalpha1 and GDNF complex in GFP-RET expressing cells) increased RET pY by 3.8-fold (P = 0.0042, RM ANOVA with Dunnett 's post hoc test) and 4.9-fold (P = 0.0465, RM ANOVA with Dunnett 's post hoc test) in GFRalpha1-RET and GFP-RET expressing cells, respectively."
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"GDNF can bind to its ligand specific co-receptor, GDNF family receptor alpha-1 (GFRA1), which is a membrane protein that is expressed in most spermatogonial subtypes in mouse testes including As, Apr, and Aal spermatogonia, triggering signaling via the transmembrane receptor tyrosine kinase RET [XREF_BIBR - XREF_BIBR]."
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"Botchkareva et al. had postulated that GDNF-GFRA1 signaling within proximal and distal outer root sheath (ORS) and inner root sheath (IRS) cells of HFs may play a direct role in blocking premature catagen entry based on their in situ mRNA expression pattern of Gfra1 and Gdnf xref ."
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"According to the survival and differentiation responses of these stable PC12 cells upon GDNF stimulation and the GDNF-GFRalpha1-Ret interaction assay, residues 152NN153, Arg259, and 316SNS318 in the GFRalpha1 central region were found to be critical for GFRalpha1 binding to GDNF and eliciting downstream signal transduction."
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"Although GDNF responsiveness is abolished in Gfra1 (-/-) neurons, it can be restored upon addition of soluble GFRalpha1, a result that is only compatible with the existence of a previously unknown transmembrane signaling partner for the GDNF and GFRalpha1 complex in GABAergic neurons."
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"A precedent for the potential therapeutic effects of neurotrophic factors in injured salivary glands has already been demonstrated in vivo with administration of GDNF or Neurturin, which bind Gfra1 and Gfra2 receptors and improve saliva secretion post-irradiation (Ferreira, et al., 2018; Xiao, et al., 2014; Knox, et al., 2013)."
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"According to the survival and differentiation responses of these stable PC12 cells upon GDNF stimulation and the GDNF-GFRalpha1-Ret interaction assay, residues 152NN153, Arg259, and 316SNS318 in the GFRalpha1 central region were found to be critical for GFRalpha1 binding to GDNF and eliciting downstream signal transduction."
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"As GFRalpha1 possesses no transmembrane domain, intracellular signalling by the GDNF and GFRalpha1 complex is induced via recruitment of one of two co-receptors : REarranged during Transfection (RET) or intracellular domain containing isoforms of neural cell adhesion molecule (NCAM)."
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"With a lower affinity, the GDNF and GFRalpha1 complex can signal via the RET independent mechanism with the neural cell adhesion molecule (NCAM); GDNF can also signal independently from GFRalpha1 by interacting with the heparin sulfate proteoglycan syndecan-3 [XREF_BIBR, XREF_BIBR]."
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"Briefly, GDNF binds its receptor GFRA1 on SSCs, followed by a subsequent signaling of a co-receptor RET, a transmembrane receptor tyrosine kinase, within all undifferentiated spermatogonia, which leads to upregulation in Src family kinase (SFK) signaling and activation of genes encoding key transcription factors (e.g., B cell CLL/lymphoma6, member B ( Bcl6b) , brachyury, Id4, ets variant gene 5 ( Etv5 ), and LIM homeobox protein 1 ( Lhx1 )), leading to self-renewal ( xref ) ( xref )."
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"Briefly, GDNF binds its receptor GFRA1 on SSCs, followed by a subsequent signaling of a co-receptor RET, a transmembrane receptor tyrosine kinase, within all undifferentiated spermatogonia, which leads to upregulation in Src family kinase (SFK) signaling and activation of genes encoding key transcription factors (e.g., B cell CLL and lymphoma6, member B (Bcl6b), brachyury, Id4, ets variant gene 5 (Etv5), and LIM homeobox protein 1 (Lhx1)), leading to self-renewal (XREF_FIG)."
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"In human pancreatic adenocarcinoma (MiaPaCa-2) cells, GDNF binds to its receptor GFRalpha1, activates the RET co-receptor, and promotes mitogen-activated protein kinase (MAPK) signaling to induce cancer cell migration towards nerve in vitro and animal models of PNI [ xref , xref ]."
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"Based on this evidence, we aimed to explore whether Gdnf-GFRα1 expression contributes to cognitive decline in the F1 and F2 generations of mouse dams exposed to lipopolysaccharide (LPS) during late gestation, and to evaluate also the potential interference effect of pro-inflammatory cytokines."
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"In vitro studies have shown that following GDNF binding to GFRalpha1 the resulting complex recruits RET, leading to its activation by dimerization and autophosphorylation at specific cytoplasmic tyrosine residues, thus initiating a number of downstream intracellular pathways [XREF_BIBR]."
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"Once activated by the complex GDNF and GFRalpha1, Ret isoforms undergo transphosphorylation on several tyrosine residues, activating the Ras and mitogen activated protein kinase (MAPK) and the phosphatidylinositol-3-kinase and AKT, responsible for cell survival or differentiation, and the phospholipase C-gamma (PLCgamma) pathway."
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"After GDNF and GFRalpha1 binding, Ret can either signal via the PI3K and Akt- or MEK and Erk-pathways depending upon its localization in lipid raft or non lipid raft compartments at the cell membrane, while NCAM is well recognized to signal via the MEK and Erk-pathway after activation of the Src family kinase Fyn."
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"These studies revealed that exogenous GFRα1 supplied in soluble form to primary MGE cultures derived from mutant mice lacking GFRα1 could rescue the effects of the mutation, a result that is only compatible with the existence of a transmembrane signaling partner for the GDNF-GFRα1 complex in GABAergic neurons."
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"The binding of GDNF to Ret and GFRalpha1 leads to Ret phosphorylation (Kjaer and Ibanez, 2003; Sariola and Saarma, 2003), and thereby leads to the activation of several intracellular signaling pathways, including RAS and mitogen activated protein kinase and extracellular signal regulated kinase pathway and phosphoinositide 3-kinase/Akt/mammalian target of rapamycin (mTOR) pathway, which in turn promotes neuronal survival and differentiation (Creedon et al., 1997; Uesaka et al., 2013)."
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"Canonically, the GDNF and GFRA1 complex activates RET to potentiate downstream signaling through the mitogen activated protein kinase (MAPK)/extracellular-signal-regulated kinase (ERK) and phosphoinositide 3-kinase (PI3K) pathways, promoting the differentiation, proliferation, and survival of neurons."
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"In vitro studies have shown that following GDNF binding to GFRalpha1 the resulting complex recruits Ret, leading to its activation by dimerization and autophosphorylation at specific cytoplasmic tyrosine residues, thus initiating a number of downstream intracellular pathways XREF_BIBR."