Galanin receptor-1 modulates 5-hydroxtryptamine-1A signaling via heterodimerization. 2010

Dasiel O Borroto-Escuela, and Manuel Narvaez, and Daniel Marcellino, and Concepción Parrado, and José Angel Narvaez, and Alexander O Tarakanov, and Luigi F Agnati, and Zaida Díaz-Cabiale, and Kjell Fuxe
Department of Neuroscience, Karolinska Institutet. Retzius väg 8, 17177 Stockholm, Sweden. Dasiel.Borroto-Escuela@ki.se

Previous biochemical, cardiovascular and behavioral work has given evidence for the existence of antagonistic galanin receptor-5-HT1A receptor interactions in the brain. In this study we investigated the existence of GalR1-5-HT1A receptor heteromers and their functional characteristics. In mammalian cells transfected with GFP2-tagged 5-HT1A receptor and YFP-tagged GalR1 receptor, a proximity-based fluorescence resonance energy transfer technique was used and it has been demonstrated that GalR1-5-HT1A receptors heteromerize. Furthermore, signaling by either the mitogen-activated protein kinase (MAPK) or adenylyl cyclase (AC) pathways by these heteromers indicates a trans-inhibition phenomenon through their interacting interface via allosteric mechanisms that block the development of an excessive activation of G(i/o) and an exaggerated inhibition of AC or stimulation of MAPK activity. The presence of these heteromers in the discrete brain regions is postulated based on the existence of GalR-5-HT1A receptor-receptor interactions previously described in the brain and gives rise to explore possible novel therapeutic strategies for treatment of depression by targeting the GalR1-5-HT1A heteromers.

UI MeSH Term Description Entries
D008156 Luciferases Enzymes that oxidize certain LUMINESCENT AGENTS to emit light (PHYSICAL LUMINESCENCE). The luciferases from different organisms have evolved differently so have different structures and substrates. Luciferase
D002460 Cell Line Established cell cultures that have the potential to propagate indefinitely. Cell Lines,Line, Cell,Lines, Cell
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D015398 Signal Transduction The intracellular transfer of information (biological activation/inhibition) through a signal pathway. In each signal transduction system, an activation/inhibition signal from a biologically active molecule (hormone, neurotransmitter) is mediated via the coupling of a receptor/enzyme to a second messenger system or to an ion channel. Signal transduction plays an important role in activating cellular functions, cell differentiation, and cell proliferation. Examples of signal transduction systems are the GAMMA-AMINOBUTYRIC ACID-postsynaptic receptor-calcium ion channel system, the receptor-mediated T-cell activation pathway, and the receptor-mediated activation of phospholipases. Those coupled to membrane depolarization or intracellular release of calcium include the receptor-mediated activation of cytotoxic functions in granulocytes and the synaptic potentiation of protein kinase activation. Some signal transduction pathways may be part of larger signal transduction pathways; for example, protein kinase activation is part of the platelet activation signal pathway. Cell Signaling,Receptor-Mediated Signal Transduction,Signal Pathways,Receptor Mediated Signal Transduction,Signal Transduction Pathways,Signal Transduction Systems,Pathway, Signal,Pathway, Signal Transduction,Pathways, Signal,Pathways, Signal Transduction,Receptor-Mediated Signal Transductions,Signal Pathway,Signal Transduction Pathway,Signal Transduction System,Signal Transduction, Receptor-Mediated,Signal Transductions,Signal Transductions, Receptor-Mediated,System, Signal Transduction,Systems, Signal Transduction,Transduction, Signal,Transductions, Signal
D044091 Receptor, Galanin, Type 1 The most abundant galanin receptor subtype. It displays a high affinity for the full-length form of GALANIN. Galanin Receptor 1,GALR1 Galanin Receptor,Galanin-1 Receptor,Galanin 1 Receptor,Galanin Receptor, GALR1,Receptor 1, Galanin,Receptor, GALR1 Galanin,Receptor, Galanin-1
D044282 Receptor, Serotonin, 5-HT1A A serotonin receptor subtype found distributed through the CENTRAL NERVOUS SYSTEM where they are involved in neuroendocrine regulation of ACTH secretion. The fact that this serotonin receptor subtype is particularly sensitive to SEROTONIN RECEPTOR AGONISTS such as BUSPIRONE suggests its role in the modulation of ANXIETY and DEPRESSION. Serotonin 1A Receptor,5-HT(1A) Receptor,5-HT1A Receptor,5-Hydroxytryptamine 1A Receptor,5-Hydroxytryptamine 1A Receptors,Receptor, 5-Hydroxytryptamine 1A,Serotonin Receptor, 5-HT1A,Serotonin, 5-HT1a Receptor,1A Receptor, 5-Hydroxytryptamine,1A Receptors, 5-Hydroxytryptamine,5 HT1A Receptor,5 Hydroxytryptamine 1A Receptor,5 Hydroxytryptamine 1A Receptors,5-HT1A Serotonin Receptor,5-HT1a Receptor Serotonin,Receptor Serotonin, 5-HT1a,Receptor, 5 Hydroxytryptamine 1A,Receptor, 5-HT1A,Receptor, 5-HT1A Serotonin,Receptor, Serotonin 1A,Receptors, 5-Hydroxytryptamine 1A,Serotonin Receptor, 5 HT1A,Serotonin, 5 HT1a Receptor
D055503 Protein Multimerization The assembly of the QUATERNARY PROTEIN STRUCTURE of multimeric proteins (MULTIPROTEIN COMPLEXES) from their composite PROTEIN SUBUNITS. Protein Dimerization,Protein Heteromultimerizaton,Protein Multimer Assembly,Protein Trimerization,Assembly, Protein Multimer,Dimerization, Protein,Heteromultimerizaton, Protein,Heteromultimerizatons, Protein,Multimer Assembly, Protein,Multimerization, Protein,Trimerization, Protein
D017930 Genes, Reporter Genes whose expression is easily detectable and therefore used to study promoter activity at many positions in a target genome. In recombinant DNA technology, these genes may be attached to a promoter region of interest. Reporter Genes,Gene, Reporter,Reporter Gene
D018613 Microscopy, Confocal A light microscopic technique in which only a small spot is illuminated and observed at a time. An image is constructed through point-by-point scanning of the field in this manner. Light sources may be conventional or laser, and fluorescence or transmitted observations are possible. Confocal Microscopy,Confocal Microscopy, Scanning Laser,Laser Microscopy,Laser Scanning Confocal Microscopy,Laser Scanning Microscopy,Microscopy, Confocal, Laser Scanning,Confocal Laser Scanning Microscopy,Confocal Microscopies,Laser Microscopies,Laser Scanning Microscopies,Microscopies, Confocal,Microscopies, Laser,Microscopies, Laser Scanning,Microscopy, Laser,Microscopy, Laser Scanning,Scanning Microscopies, Laser,Scanning Microscopy, Laser
D031541 Fluorescence Resonance Energy Transfer A type of FLUORESCENCE SPECTROSCOPY using two FLUORESCENT DYES with overlapping emission and absorption spectra, which is used to indicate proximity of labeled molecules. This technique is useful for studying interactions of molecules and PROTEIN FOLDING. Forster Resonance Energy Transfer

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