Search results for "Gs alpha subunit"

showing 3 items of 3 documents

2004

We investigated how the synthesis of cAMP, stimulated by isoproterenol acting through β-adrenoreceptors and Gs, is strongly amplified by simultaneous incubation with baclofen. Baclofen is an agonist of δ-aminobutyric acid type B receptors [GABAB], known to inhibit adenylyl cyclase via Gi. Because these agents have opposite effects on cAMP levels, the unexpected increase in cAMP synthesis when they are applied simultaneously has been intensively investigated. From previous reports, it appears that cyclase type II contributes most significantly to this phenomenon. We found that simultaneous application of isoproterenol and baclofen specifically influences the association/dissociation of molec…

Adenylyl cyclasechemistry.chemical_compoundGs alpha subunitchemistryADCY9GTP-Binding Protein beta SubunitsCell BiologyBiologyReceptorCyclaseCyclase activityADCY10Cell biologyBMC Cell Biology
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Biphasic Erk1/2 activation sequentially involving Gs and Gi signaling is required in beta3-adrenergic receptor-induced primary smooth muscle cell pro…

2013

Abstract The beta3 adrenergic receptor (B3-AR) reportedly induces cell proliferation, but the signaling pathways that were proposed, involving either Gs or Gi coupling, remain controversial. To further investigate the role of G protein coupling in B3-AR induced proliferation, we stimulated primary human myometrial smooth muscle cells with SAR150640 (B3-AR agonist) in the absence or presence of variable G-protein inhibitors. Specific B3-AR stimulation led to an Erk1/2 induced proliferation. We observed that the proliferative effects of B3-AR require two Erk1/2 activation peaks (the first after 3 min, the second at 8 h). Erk1/2 activation at 3 min was mimicked by forskolin (adenylyl-cyclase a…

Beta-3 adrenergic receptorGs alpha subunitMAP Kinase Signaling SystemMyocytes Smooth MuscleProliferationG protein coupled receptorBiologyGTP-Binding Protein alpha Subunits Gi-GoPertussis toxinchemistry.chemical_compoundErk1/2Protein kinasesCyclinsReceptors Adrenergic betaGTP-Binding Protein alpha Subunits GsHumansMolecular BiologyPI3K/AKT/mTOR pathwayCells CulturedG protein-coupled receptorCell ProliferationForskolinColforsinBeta-3 adrenergic receptorCell BiologyCell biologychemistryGene Expression RegulationPertussis ToxinMyometriumFemaleSignal transductionProto-oncogene tyrosine-protein kinase SrcBiochimica et Biophysica Acta (BBA) - Molecular Cell Research
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Coupling of endothelin receptors to the ERK/MAP kinase pathway. Roles of palmitoylation and G(alpha)q.

2001

Endothelins are potent mitogens that stimulate extracellular signal-regulated kinases (ERK/MAP kinases) through their cognate G-protein-coupled receptors, ET(A) and ET(B). To address the role of post-translational ET receptor modifications such as acylation on ERK activation and to identify relevant downstream effectors coupling the ET receptor to the ERK signaling cascades we have constructed a panel of palmitoylation-deficient ET receptor mutants with differential G(alpha) protein binding capacity. Endothelin-1 stimulation of wild-type ET(A) or ET(B) induced a fivefold to sixfold increase in ERK in COS-7 and CHO cells whereas full-length nonpalmitoylated ET(A) and ET(B) mutants failed to …

MAPK/ERK pathwayGs alpha subunitInsectaMAP Kinase Signaling SystemBlotting WesternMolecular Sequence DataPalmitic AcidSRC Family Tyrosine KinaseBiochemistryCell LineCricetinaeArrestinTumor Cells CulturedAnimalsHumansAmino Acid SequenceReceptorMitogen-Activated Protein Kinase 1KinaseChemistryReceptors EndothelinCell MembraneHeterotrimeric GTP-Binding ProteinsCell biologyEnzyme ActivationErbB ReceptorsType C PhospholipasesCOS CellsMutationcardiovascular systemMutagenesis Site-DirectedPhosphorylationGTP-Binding Protein alpha Subunits Gq-G11Mitogen-Activated Protein KinasesProto-oncogene tyrosine-protein kinase SrcEuropean journal of biochemistry
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