0000000000201558

AUTHOR

Luigi F. Agnati

showing 9 related works from this author

Fibroblast Growth Factor Receptor 1– 5-Hydroxytryptamine 1A Heteroreceptor Complexes and Their Enhancement of Hippocampal Plasticity

2011

Background The hippocampus and its 5-hydroxytryptamine transmission plays an important role in depression related to its involvement in limbic circuit plasticity. Methods The analysis was made with bioluminescence resonance energy transfer, co-immunoprecipitation, in situ proximity ligation assay, binding assay, in cell western and the forced swim test. Results Using bioluminescence resonance energy transfer analysis, fibroblast growth factor receptor 1 (FGFR1)-5-hydroxytryptamine 1A (5-HT1A) receptor complexes have been demonstrated and their specificity and agonist modulation characterized. Their presence based on co-immunoprecipitation and proximity ligation assay has also been indicated…

Agonistmedicine.medical_specialtyReceptor complexmedicine.drug_classProximity ligation assayBiologyHippocampal formationTransfectionHeteroreceptorSettore BIO/09 - FisiologiaHippocampusRats Sprague-DawleyGrowth factor receptorInternal medicineFluorescence Resonance Energy TransfermedicineAnimalsHumansImmunoprecipitationReceptor Fibroblast Growth Factor Type 1Enzyme InhibitorsRNA Small InterferingCells CulturedBiological PsychiatryNeurons8-Hydroxy-2-(di-n-propylamino)tetralinNeuronal PlasticityDose-Response Relationship DrugFibroblast growth factor receptor 1Computational BiologyAllosteric modulation depression fibroblast growth factor receptor heteroreceptor neuronal plasticity serotonin receptorsRatsSerotonin Receptor AgonistsCell biologyEndocrinologyAnimals NewbornFibroblast growth factor receptorReceptor Serotonin 5-HT1AFibroblast Growth Factor 2PeptidesSignal TransductionBiological Psychiatry
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Nicotine-induced FGF-2 mRNA in rat brain is preserved during aging

2004

Indirect trophic actions of nicotine on brain during aging are suggested from observations describing nicotine as a cognitive enhancer, increasing vigilance and improving learning and memory, and both in vitro and in vivo models have demonstrated neuroprotective effects of nAChR agonists. Previously, we have reported that an acute intermittent (-)nicotine treatment significantly increases fibroblast growth factor-2 (FGF-2) mRNA and protein in several brain regions of rat brain. The present study was designed to analyse if nicotine-induced FGF-2 expression in the rat brain was preserved during aging. Using in situ hybridization and quantitative RNase protection assay the present paper report…

SenescenceNicotineAgingmedicine.medical_specialtyCentral nervous systemStimulationIn situ hybridizationBiologynAChRNeuroprotectionNicotine treatmentStriatumNicotineHippocampuInternal medicineGliamedicineSubstantia nigraAnimalsTissue DistributionRNA MessengerAcetylcholine receptorGeneral NeuroscienceBrainNeuronFGF-2 expression; nicotine treatment; hippocampus; substantia nigra; striatum; brain; neurons; glia; nAChR; neurotrophism; neuroprotectionNeuroprotectionRatsmedicine.anatomical_structureEndocrinologyGene Expression RegulationFGF-2 expressionNeurotrophismFibroblast Growth Factor 2Neurology (clinical)NeuronGeriatrics and GerontologyDevelopmental Biologymedicine.drug
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Increase of the FGFR1 signaling in the FGFR1-5-HT1A heteroreceptor complex in midbrain raphe 5-HT neuron systems via allosteric receptor-receptor int…

2015

The ascending midbrain 5-HT neurons known to contain 5-HT1A autoreceptors may be dysregulated in depression due to a reduced trophic support. New findings show existence of FGFR1-5-HT1A heteroreceptor complexes in the rat hippocampus with a partial characterization of their interface and in midbrain raphe 5-HT nerve cells. With in situ Proximity Ligation Assay (PLA) and supported by co-location of the FGFR1 and 5-HT1A immunoreactivities in midbrain raphe 5-HT cells, evidence for the existence of FGFR1-5-HT1A heteroreceptor complexes were obtained in the dorsal and median raphe nuclei of the Sprague–Dawley rat. Their existence in the rat medullary raphe RN33B cell cultures was also establish…

Agonistmedicine.medical_specialtymedicine.drug_classheteroreceptor complexesBiologyHeteroreceptorMidbrain03 medical and health sciences0302 clinical medicineDorsal raphe nucleusInternal medicinemedicineMultidisciplinaryRapheReceptor-receptor interactionCell biologyEndocrinologymedicine.anatomical_structureserotonin 5-HT1A receptornervous system030220 oncology & carcinogenesisPoster Presentationfibroblast growth factor receptorAutoreceptorNeuron030217 neurology & neurosurgerySpringerPlus
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Enhancement of the FGFR1 signaling in the FGFR1-5-HT1A heteroreceptor complex in midbrain raphe 5-HT neuron systems. Relevance for neuroplasticity an…

2015

New findings show existence of FGFR1-5-HT1A heteroreceptor complexes in 5-HT nerve cells of the dorsal and median raphe nuclei of the rat midbrain and hippocampus. Synergistic receptor-receptor interactions in these receptor complexes indicated their enhancing role in hippocampal plasticity. The existence of FGFR1-5-HT1A heteroreceptor complexes also in midbrain raphe 5-HT nerve cells open up the possibility that antidepressant drugs by increasing extracellular 5-HT levels can cause an activation of the FGF-2/FGFR1 mechanism in these nerve cells as well. Therefore, the agonist modulation of the FGFR1-5-HT1A heteroreceptor complexes and their specific role is now determined in rat medullary …

AgonistSerotoninmedicine.medical_specialtymedicine.drug_classCellular differentiationBiophysicsHeteroreceptor complexBiologyHeteroreceptorBiochemistrySettore BIO/09 - FisiologiaCell LineMidbrainDorsal raphe nucleusMesencephalonInternal medicinemedicineAnimalsSerotonin 5-HT1A receptorReceptor Fibroblast Growth Factor Type 1Protein Interaction MapsPhosphorylationExtracellular Signal-Regulated MAP KinasesMolecular BiologyNeurons8-Hydroxy-2-(di-n-propylamino)tetralinNeuronal PlasticityRapheDepressionAnimalExtracellular Signal-Regulated MAP KinaseCell BiologySerotonin 5-HT1 Receptor AgonistsNeuronFibroblast growth factor receptorRatsEndocrinologymedicine.anatomical_structurenervous systemReceptor Serotonin 5-HT1AAutoreceptorRatFibroblast Growth Factor 2Serotonin 5-HT1 Receptor AgonistNeuronDimerizationNeuroscienceDepression; Dimerization; Fibroblast growth factor receptor; Heteroreceptor complex; Neuronal plasticity; Serotonin 5-HT1A receptor; 8-Hydroxy-2-(di-n-propylamino)tetralin; Animals; Cell Line; Extracellular Signal-Regulated MAP Kinases; Fibroblast Growth Factor 2; Mesencephalon; Neurons; Phosphorylation; Rats; Receptor Fibroblast Growth Factor Type 1; Receptor Serotonin 5-HT1A; Serotonin; Serotonin 5-HT1 Receptor Agonists; Neuronal Plasticity; Protein Interaction Maps
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The existence of FGFR1-5-HT1A receptor heterocomplexes in midbrain 5-HT neurons of the rat: relevance for neuroplasticity.

2012

The ascending midbrain 5-HT neurons to the forebrain may be dysregulated in depression and have a reduced trophic support. Within situproximity ligation assay (PLA) and supported by coimmunoprecipitation and colocation of the FGFR1 and 5-HT1A immunoreactivities in the midbrain raphe cells, evidence for the existence of FGFR1–5-HT1A receptor heterocomplexes in the dorsal and median raphe nuclei of the Sprague Dawley rat as well as in the rat medullary raphe RN33B cells has been obtained. Especially after combined FGF-2 and 8-OH-DPAT treatment, a marked and significant increase in PLA clusters was found in the RN33B cells. Similar results were reached with the FRET technique in HEK293T cells,…

Retractedmedicine.medical_specialtySerotonin receptorsEncèfalSettore BIO/11 - Biologia MolecolareBiologySettore BIO/09 - FisiologiaReceptors de serotoninaMidbrainInternal medicineRatesmedicineReceptor5-HT receptorNeuronal Plasticity Receptor Fibroblast Growth Factor Receptor Serotonin 5-HT1A Serotonergic Neurons SerotoninRapheGeneral NeuroscienceEncephalonFibroblastsRatsEndocrinologymedicine.anatomical_structurenervous systemForebrainAutoreceptor5-HT1A receptorNeuron
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From the Golgi-Cajal mapping to the transmitter-based characterization of the neuronal networks leading to two modes of brain communication: Wiring a…

2007

After Golgi-Cajal mapped neural circuits, the discovery and mapping of the central monoamine neurons opened up for a new understanding of interneuronal communication by indicating that another form of communication exists. For instance, it was found that dopamine may be released as a prolactin inhibitory factor from the median eminence, indicating an alternative mode of dopamine communication in the brain. Subsequently, the analysis of the locus coeruleus noradrenaline neurons demonstrated a novel type of lower brainstem neuron that monosynaptically and globally innervated the entire CNS. Furthermore, the ascending raphe serotonin neuron systems were found to globally innervate the forebrai…

DopamineTortuosityBrain functionWiring transmissionSynaptic TransmissionDiffusionDual probe microdialysisMicrofluorimetrychemistry.chemical_compoundCatecholaminesPressure gradientsVolume transmissionHistofluorescenceLocus coeruleusExtracellular spaceNeurological and mental disordersNeurotransmitterNeuronsNeurotransmitter AgentsGeneral NeuroscienceBrain5-HydroxytryptamineAmygdalamedicine.anatomical_structure5-Hydroxytryptamine; Amygdala; Brain function; Brain uncoupling protein-2; Catecholamines; CA turnover; Clearance; Diffusion; Dopamine; Dorsal raphe; Dual probe microdialysis; Extracellular space; Extrasynaptic receptors; Histofluorescence; Local circuits; Locus coeruleus; Mapping of monoamine neurons; Microdensitometry; Microfluorimetry; Neurological and mental disorders; Noradrenaline; Nucleus accumbens; Pressure gradients; Receptor mosaics; Receptor–receptor interactions; Substantia nigra; Thermal gradients; Tortuosity; Transmitter–receptor mismatches; Volume fraction; Volume transmission; Wiring transmissionClearanceNucleus accumbensCA turnoverLocal circuitsReceptor–receptor interactionsSilver StainingMapping of monoamine neuronsModels NeurologicalNeurotransmissionBiologySerotonergicSubstantia nigramedicineBiological neural networkAnimalsHumansThermal gradientsTransmitter–receptor mismatchesVolume fractionExtrasynaptic receptorsMonoamine neurotransmitterchemistryReceptor mosaicsForebrainNoradrenalineLocus coeruleusBrain uncoupling protein-2Neurology (clinical)NeuronNerve NetMicrodensitometry5-Hydroxytryptamine Amygdala Brain function Brain uncoupling protein-2 Catecholamines CA turnover Clearance DiffusionNeuroscienceDorsal raphe
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Evidence for the existence of FGFR1-5-HT1A heteroreceptor complexes in the midbrain raphe 5-HT system.

2015

The ascending midbrain 5-HT neurons known to contain 5-HT1A autoreceptors may be dysregulated in depression due to a reduced trophic support. With in situ proximity ligation assay (PLA) and supported by co-location of the FGFR1 and 5-HT1A immunoreactivities in midbrain raphe 5-HT cells, evidence for the existence of FGFR1–5-HT1A heteroreceptor complexes were obtained in the dorsal and median raphe nuclei of the Sprague–Dawley rat. Their existence in the rat medullary raphe RN33B cell cultures was also established. After combined FGF-2 and 8-OH-DPAT treatment, a marked and significant increase in PLA positive clusters was found in the RN33B cells. Similar results were reached upon coactivati…

Malemedicine.medical_specialtySerotoninG-protein-coupled receptorReceptor tyrosine kinaseBiophysicsHeteroreceptor complexProximity ligation assayBiologyHeteroreceptorBiochemistryMidbrainRats Sprague-DawleyG-protein-coupled receptors; Receptor tyrosine kinases; Fibroblast growth factor receptor 1; Serotonin receptors; Heteroreceptor complex; DimerizationInternal medicinemedicineFluorescence Resonance Energy TransferAnimalsHumansReceptor Fibroblast Growth Factor Type 1Serotonin receptorMolecular Biology5-HT receptorNeurons8-Hydroxy-2-(di-n-propylamino)tetralinRapheMidbrain Raphe NucleiCell BiologyFibroblast growth factor receptor 1Cell biologyRatsmedicine.anatomical_structureEndocrinologyHEK293 Cellsnervous systemGene Expression RegulationReceptor Serotonin 5-HT1AAutoreceptorFibroblast Growth Factor 2NeuronRaphe nucleiPeptidesDimerizationProtein BindingBiochemical and biophysical research communications
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Acute intermittent nicotine treatment produces a reduction in the total number of FGF-2 immunoreactive astroglial cells in the substantia nigra of th…

2004

To understand the morphological substrate of the nicotine effect on nigral FGF-2 expression, a stereological analysis of FGF-2 immunoreactive neuronal and glial profiles has been performed in the substantia nigra of the rat after acute intermittent nicotine treatment. The major finding of this paper is the demonstration that this type of nicotine treatment produces a significant reduction in the total number of nuclear FGF-2 immunoreactive astroglial profiles in the substantia nigra. A parallel analysis of nigral FGF-1 and FGF-5 immunoreactivities showed no effect of this type of nicotine treatment. The results may be explained by an inhibition of FGF-2 synthesis in a subpopulation of nigra…

Malemedicine.medical_specialtyNicotineCentral nervous systemFGF-2Substantia nigraStereologyFGF-1Cell CountBiologyFibroblast growth factornicotine; FGF-2; stereology; immunoreactivity; substantia nigra; FGF-1; FGF-5FGF-5NicotineRats Sprague-DawleyStereotaxic TechniquesInternal medicinemedicineAnimalsGeneral NeuroscienceAlkaloidImmunohistochemistryRatsSubstantia Nigramedicine.anatomical_structureEndocrinologyNicotinic agonistnervous systemsubstantia nigraAstrocytesStereotaxic techniquestereologyFibroblast Growth Factor 2immunoreactivitymedicine.drugnicotineNeuroscience letters
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Agonist-induced formation of FGFR1 homodimers and signaling differ among members of the FGF family

2011

Fibroblast growth factor receptor 1 (FGFR1) is known to be activated by homodimerization in the presence of both the FGF agonist ligand and heparan sulfate glycosaminoglycan. FGFR1 homodimers in turn trigger a variety of downstream signaling cascades via autophosphorylation of tyrosine residues in the cytoplasmic domain of FGFR1. By means of Bioluminescence Energy Resonance Transfer (BRET) as a sign of FGFR1 homodimerization, we evaluated in HEK293T cells the effects of all known FGF agonist ligands on homodimer formation. A significant correlation between BRET(2) signaling and ERK1/2 phosphorylation was observed, leading to a further characterization of the binding and signaling properties…

AgonistMAPK/ERK pathwaymedicine.drug_classBiophysicsSettore BIO/11 - Biologia MolecolareBiologyLigandsFibroblast growth factorSettore BIO/09 - FisiologiaBiochemistrychemistry.chemical_compoundFluorescence Resonance Energy TransfermedicineHumansReceptor Fibroblast Growth Factor Type 1Molecular BiologyMitogen-Activated Protein Kinase 1Mitogen-Activated Protein Kinase 3Fibroblast growth factor receptor 1HEK 293 cellsAutophosphorylationCell BiologyHeparan sulfateFibroblast growth factors FGFR1 Homodimerization BRET MAPKCell biologyFibroblast Growth Factorsstomatognathic diseasesHEK293 CellschemistrySettore BIO/14 - FarmacologiaPhosphorylationHeparitin SulfateProtein MultimerizationBiochemical and Biophysical Research Communications
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