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Aliaga E, Silhol M, Bonneau N, Maurice T, Arancibia S, Tapia-Arancibia L. Dual response of BDNF to sublethal concentrations of beta-amyloid peptides in cultured cortical neurons. Neurobiol Dis 2009; 37:208-17. [PMID: 19822210 DOI: 10.1016/j.nbd.2009.10.004] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2009] [Revised: 09/25/2009] [Accepted: 10/02/2009] [Indexed: 02/06/2023] Open
Abstract
Beta-amyloid (Abeta) deposition is one important pathological hallmark in Alzheimer's disease (AD). However, low levels of Abeta may modify critical endogenous protection systems before neurodegeneration occurs. We examined the time-course effect of sublethal concentrations of Abeta on total BDNF (panBDNF), BDNF transcripts (I, II, IV and VI), trkB.FL, trkB.T1 and p75(NGFR) mRNA expression in cultured cortical neurons. We have shown that Abeta exhibited a dual response on BDNF mRNA, i.e. an increase at short times (3-5 h) and a dramatic decrease at longer times (24 or 48 h). The early increase in BDNF expression seems to be driven by increased expression of transcripts I and IV. The BDNF drop was specific since did not occur for other mRNAs examined. The BDNF protein content showed a similar profile but did not follow the dramatic reduction as its encoding mRNA. These observations may help to explain cognitive deficits observed at initial stages of AD.
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Affiliation(s)
- E Aliaga
- Centro de Neurobiología y Plasticidad del Desarrollo, Departamento de Fisiología, Facultad de Ciencias, Universidad de Valparaíso, Gran Bretaña 1111, Playa Ancha, Valparaíso, Chile
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2
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Beneficial effects of rolipram in the R6/2 mouse model of Huntington's disease. Neurobiol Dis 2008; 30:375-387. [PMID: 18424161 DOI: 10.1016/j.nbd.2008.02.010] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2007] [Revised: 02/08/2008] [Accepted: 02/22/2008] [Indexed: 12/24/2022] Open
Abstract
We have previously showed that rolipram, a phosphodiesterase type IV inhibitor, displays a neuroprotective effect in a rat quinolinic acid model of HD [DeMarch Z., Giampa C., Patassini S., Martorana A., Bernardi G. and Fusco F.R., (2007) Beneficial effects of rolipram in a quinolinic acid model of striatal excitotoxicity. Neurobiol. Dis. 25:266-273.]. In this study, we sought to determine if rolipram exerts a neuroprotective effect in R6/2 mutant mice, which recapitulates, in many aspects, human HD [Mangiarini L., Sathasivam K., Seller M., Cozens B., Harper A., Hetherington C., Lawton M., Trottier Y., Lehrach H., Davies S.W. and Bates G.P. (1996) Exon 1 of the HD gene with an expanded CAG repeat is sufficient to cause a progressive neurological phenotype in transgenic mice. Cell. 87:493-506]. Transgenic mice were treated with rolipram 1.5 mg/kg daily starting from 4 weeks of age. After transcardial perfusion, histological and immunohistochemical studies were performed. We found that rolipram-treated R6/2 mice survived longer and displayed less severe signs of neurological dysfunction than the vehicle treated ones. Primary outcome measures such as brain volume, striatal atrophy, size and morphology of striatal neurons, neuronal intranuclear inclusions and microglial reaction confirmed a neuroprotective effect of the compound. Rolipram was effective in increasing significantly the levels of activated CREB and of BDNF the striatal spiny neurons, which might account for the beneficial effects observed in this model. Our findings show that rolipram could be considered as a valid therapeutic approach for HD.
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3
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Bustos G, Abarca J, Campusano J, Bustos V, Noriega V, Aliaga E. Functional interactions between somatodendritic dopamine release, glutamate receptors and brain-derived neurotrophic factor expression in mesencephalic structures of the brain. ACTA ACUST UNITED AC 2004; 47:126-44. [PMID: 15572168 DOI: 10.1016/j.brainresrev.2004.05.002] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/14/2004] [Indexed: 11/28/2022]
Abstract
Dopaminergic nigrostriatal neurons may be considered as bipolar functional entities since they are endowed with the ability to synthesize, store and release the transmitter dopamine (DA) at the somatodendritic level in the substantia nigra (SN). Such dendritic DA release seems to be distinct from the transmitter release occurring at the axon terminal and seems to rely preferentially on volume transmission to exert its physiological effects. An increased glutamatergic (Gluergic) transmission into the SN facilitates such dendritic DA release via activation of NMDA-receptors (NMDA-Rs) and to a lesser extent through group II metabotropic glutamate receptors (mGluRs). In addition, nigral mGluRs functionally interact with NMDA-Rs in the SN, further modulating the NMDA-R-mediated increase of DA release from dendrites in the SN. In turn, dendritically released DA may exert, via D1 receptors, a tonic inhibitory control upon nigral glutamate (Glu). Furthermore, released DA, via D2/D3 autoreceptors, produces an autoinhibitory effect upon DA cell firing and its own release process. An increased Gluergic transmission into the SN may also induce, via activation of NMDA-Rs, an augmented expression of different brain-derived neurotrophic factor (BDNF) gene transcripts in this brain area. Pharmacological evidence suggests that non-NMDA-Rs could also participate in the regulation of BDNF gene expression in the SN. Glu-mediated changes of nigral BDNF expression could regulate, in turn, the expression of important transmitter-related proteins in the SN, such as different NMDA-R subunits, mGluRs and DA-D3 receptors. In conclusion, Glu-DA-BDNF interactions in the SN may play an important role in modulating the flow of neuronal information in this brain structure under normal conditions, as well as during adaptive and plastic responses associated with various neurological and psychiatric disorders.
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Affiliation(s)
- Gonzalo Bustos
- Laboratory of Biochemical Pharmacology, Department of Cell and Molecular Biology, Catholic University of Chile, Alameda 340, Santiago 114-D, Chile.
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4
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Kohno R, Sawada H, Kawamoto Y, Uemura K, Shibasaki H, Shimohama S. BDNF is induced by wild-type α-synuclein but not by the two mutants, A30P or A53T, in glioma cell line. Biochem Biophys Res Commun 2004; 318:113-8. [PMID: 15110760 DOI: 10.1016/j.bbrc.2004.04.012] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2004] [Indexed: 10/26/2022]
Abstract
Parkinson's disease (PD) is one of the most prevalent neurodegenerative diseases but its etiology is unclear. Alpha-synuclein (alpha-SN) is a major component of Lewy bodies and Lewy neurites, and its missense mutations, A30P and A53T, cause familial PD. In PD, alpha-SN-positive glial inclusions are distributed mainly in the dorso-medial region of the substantia nigra, which contains most of the surviving dopaminergic neurons, suggesting that alpha-SN expression might have a neuroprotective function in glial cells. To investigate this hypothesis, we established alpha-SN transfected C6 glioma cell line clones and evaluated the expression of neurotrophins using semi-quantitative reverse transcription polymerase chain reaction and enzyme-linked immunosorbent assay. Brain-derived neurotrophic factor (BDNF) was induced by overexpression of wild-type alpha-SN but not by that of A30P and A53T. These data suggest that the pathogenic alpha-SN mutations, A30P or A53T, are linked to the loss of BDNF production in glial cells.
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Affiliation(s)
- Ryuichi Kohno
- Department of Neurology, Graduate School of Medicine, Kyoto University, 54 Shogoin-Kawaharacho, Sakyoku, Kyoto 606-8507, Japan
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Garcia C, Chen MJ, Garza AA, Cotman CW, Russo-Neustadt A. The influence of specific noradrenergic and serotonergic lesions on the expression of hippocampal brain-derived neurotrophic factor transcripts following voluntary physical activity. Neuroscience 2003; 119:721-32. [PMID: 12809693 DOI: 10.1016/s0306-4522(03)00192-1] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Previous studies have shown that hippocampal brain-derived neurotrophic factor (BDNF) mRNA levels are significantly increased in rats allowed free access to exercise wheels and/or administered antidepressant medications. Enhancement of BDNF may be crucial for the clinical effect of antidepressant interventions. Since increased function of the noradrenergic and/or serotonergic systems is thought to be an important initial mechanism of antidepressant medications, we sought to test the hypothesis that noradrenergic or serotonergic function is essential for the increased BDNF transcription occurring with exercise. In addition, individual transcript variants of BDNF were examined, as evidence exists they are differentially regulated by discrete interventions, and are expressed in distinct sub-regions of the hippocampus. The neurotransmitter system-specific neurotoxins p-chloroamphetamine (serotonergic) and N-(2-chloroethyl)-N-ethyl-2-bromobenzylamine (noradrenergic) were administered to rats prior to commencing voluntary wheel-running activity. In situ hybridization experiments revealed an absence of exercise-induced full-length BDNF mRNA elevations in the hippocampi of noradrenergic-lesioned rats. In addition, the striking elevation of the exon I transcript in the dentate gyrus was removed with this noradrenergic lesion. In contrast, other transcript variants (exons II and III) were elevated in several hippocampal regions as a result of this lesion. In serotonin-lesioned rats, the significant increases in full-length BDNF, exon I and exon II mRNA levels were sustained without alteration (with the exception of exon IV in the cornus ammonis subregion 4, CA4). Overall, these results indicate that an intact noradrenergic system may be crucial for the observed ability of exercise to enhance full-length and exon I hippocampal BDNF mRNA expression. In addition, these results suggest that the promoter linked to exon I may provide a major regulatory point for BDNF mRNA expression in the dentate gyrus. Elevations of other exons, such as II and III, may require the activation of separate neurotransmitter systems and intracellular pathways.
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Affiliation(s)
- C Garcia
- Department of Biological Sciences, California State University, 5151 State University Drive, 90032, Los Angeles, CA, USA
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6
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Gall CM, Pinkstaff JK, Lauterborn JC, Xie Y, Lynch G. Integrins regulate neuronal neurotrophin gene expression through effects on voltage-sensitive calcium channels. Neuroscience 2003; 118:925-40. [PMID: 12732238 DOI: 10.1016/s0306-4522(02)00990-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Integrin adhesion receptors regulate gene expression during growth and differentiation in various cell types. Recent work, implicating integrins in functional synaptic plasticity, suggest they may have similar activities in adult brain. The present study tested if integrins binding the arginine-glycine-aspartate (RGD) matrix sequence regulate neurotrophin and neurotrophin receptor gene expression in cultured hippocampal slices. The soluble RGD-containing peptide glycine-arginine-glycine-aspartate-serine-proline (GRGDSP) increased neurotrophin mRNA levels in transcript- and subfield-specific fashions. Integrin ligand effects were greatest for brain-derived neurotrophic factor transcripts I and II and barely detectable for transcript III. In accordance with increased nerve growth factor mRNA levels, GRGDSP increased c-fos expression as well. In contrast, growth-associated protein-43, amyloid precursor protein and fibroblast growth factor-1 mRNAs were not elevated. Ligand effects on brain-derived neurotrophic factor transcript II and c-fos mRNA did not depend on the integrity of the actin cytoskeleton, neuronal activity, or various signaling pathways but were blocked by L-type voltage-sensitive calcium-channel blockers. These results indicate that in mature hippocampal neurons integrin engagement regulates expression of a subset of growth-related genes at least in part through effects on calcium influx. Accordingly, these synaptic adhesion receptors may play the same role in maintaining an adult, differentiated state in brain as they do in other tissues and changes in integrin activation and/or engagement may contribute to dynamic changes in neurotrophin expression and to neuronal calcium signaling.
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MESH Headings
- Anesthetics, Local/pharmacology
- Animals
- Animals, Newborn
- Brain-Derived Neurotrophic Factor/genetics
- Brain-Derived Neurotrophic Factor/metabolism
- Calcium Channel Blockers/pharmacology
- Calcium Channels/physiology
- Carbazoles/pharmacology
- Cytochalasin D/pharmacology
- Dose-Response Relationship, Drug
- Drug Interactions
- Enzyme Inhibitors/pharmacology
- Exons/drug effects
- Exons/genetics
- Gene Expression Regulation
- Genes, fos/drug effects
- Glycoproteins/pharmacology
- Hippocampus/cytology
- Hippocampus/drug effects
- Hippocampus/metabolism
- Immunohistochemistry/methods
- In Situ Hybridization/methods
- In Vitro Techniques
- Indole Alkaloids
- Integrins/physiology
- Neurotrophin 3/metabolism
- Nifedipine/pharmacology
- Nimodipine/pharmacology
- Nucleic Acid Synthesis Inhibitors/pharmacology
- Oligopeptides/classification
- Oligopeptides/pharmacology
- RNA Precursors/metabolism
- RNA, Messenger/biosynthesis
- Rats
- Rats, Sprague-Dawley
- Receptor, trkB/genetics
- Receptor, trkB/metabolism
- Receptor, trkC/genetics
- Receptor, trkC/metabolism
- Sesterterpenes
- Terpenes/pharmacology
- Tetrodotoxin/pharmacology
- Time Factors
- Transcription, Genetic/drug effects
- Trifluoperazine/analogs & derivatives
- Trifluoperazine/pharmacology
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Affiliation(s)
- C M Gall
- Department of Anatomy and Neurobiology, University of California at Irvine, Irvine, CA 92697-4292, USA.
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7
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Marmigère F, Rage F, Tapia-Arancibia L. GABA-glutamate interaction in the control of BDNF expression in hypothalamic neurons. Neurochem Int 2003; 42:353-8. [PMID: 12470709 DOI: 10.1016/s0197-0186(02)00100-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Brain derived-neurotrophic factor (BDNF) belongs to the neurotrophin family and regulates the survival, differentiation and maintenance of function in different neuronal populations. We previously reported that glutamate increases the expression of BDNF mRNA, its four transcripts and the BDNF peptide in fetal hypothalamic neurons, essentially through NMDA receptor activation. In the present study, we investigated whether GABA interacts with glutamate in the regulation of BDNF gene expression. BDNF and Trk B (BDNF receptor) mRNAs were determined by RNAse protection assay. BDNF transcripts expression levels were evaluated by semi-quantitative RT-PCR. BDNF peptide content was analyzed by enzyme immunoassay (ELISA).We found that picrotoxin (a GABA(A) receptor antagonist) stimulated BDNF mRNA expression and that GABA decreased the glutamate-induced augmentation with no effect on the expression of mRNA encoding the BDNF receptor, Trk B. Measurements of BDNF transcripts levels showed that transcripts containing exons I and III were increased by picrotoxin, whereas those containing exons II and IV were unchanged. GABA solely diminished the glutamate-stimulated expression of transcripts containing exon III. In addition, GABA also inhibited the stimulatory effect of glutamate on BDNF peptide content. Our findings show an interaction between glutamate and GABA on BDNF expression (mRNA, transcripts and peptide) in fetal hypothalamic neurons.
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Affiliation(s)
- Frédéric Marmigère
- Laboratoire de Plasticité Cérébrale, UMR 5102 CNRS, Université Montpellier 2, CC 090, Place Eugène Bataillon, France
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8
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Huynh G, Heinrich G. Brain-derived neurotrophic factor gene organization and transcription in the zebrafish embryo. Int J Dev Neurosci 2001; 19:663-73. [PMID: 11705671 DOI: 10.1016/s0736-5748(01)00046-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
The gene encoding zebrafish brain-derived neurotrophic factor (BDNF) was cloned from a PAC genomic DNA library. The entire transcription unit was contained in two independently isolated clones that together encompass 120 kb of genomic DNA. The intron/exon organization of the zebrafish gene was found to be identical to that of the mammalian gene but only one promoter has so far been identified. The associated 5' exon is 67% identical to exon 1c of the rat BDNF gene. A search of the 5' flank of the cloned promoter for sequence similarities with known transcription factor binding sites revealed potential AP-1, CREB, and SP1 binding sites. Fusion constructs containing the cloned promoter and 1.7 kb of 5' flank and an enhanced green fluorescent protein reporter that becomes membrane-anchored were injected into 1-8 cell stage embryos. Expression was seen in notochord, muscle, epithelial and endothelial cells of the 1-day-old embryo in consonance with the endogenous gene. These results demonstrate that the cloned promoter mediates cell-specific expression.
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MESH Headings
- Animals
- Binding Sites/genetics
- Blotting, Southern
- Body Patterning/genetics
- Brain-Derived Neurotrophic Factor/genetics
- Cloning, Molecular
- Embryo, Nonmammalian/cytology
- Embryo, Nonmammalian/embryology
- Embryo, Nonmammalian/metabolism
- Exons/genetics
- Gene Expression Regulation, Developmental/genetics
- Gene Library
- Genes, Reporter/genetics
- Molecular Sequence Data
- Polymorphism, Restriction Fragment Length
- Promoter Regions, Genetic/genetics
- Restriction Mapping
- Sequence Homology, Nucleic Acid
- Transcription, Genetic/genetics
- Transgenes/genetics
- Zebrafish/embryology
- Zebrafish/genetics
- Zebrafish/metabolism
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Affiliation(s)
- G Huynh
- Department of Medicine, Northern California Health Care System, Martinez, CA, USA
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9
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Zha XM, Bishop JF, Hansen MR, Victoria L, Abbas PJ, Mouradian MM, Green SH. BDNF synthesis in spiral ganglion neurons is constitutive and CREB-dependent. Hear Res 2001; 156:53-68. [PMID: 11377882 DOI: 10.1016/s0378-5955(01)00267-2] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Brain-derived neurotrophic factor (BDNF), which supports spiral ganglion neuron (SGN) survival in vivo and in vitro, is synthesized by SGNs. The BDNF gene generates multiple different transcripts, each from its own promoter region. Using reverse transcriptase-polymerase chain reaction (RT-PCR), we find that SGNs express only the downstream transcripts III and IV in vivo and in vitro. Using RT-PCR assays of BDNF transcripts and transfection of BDNF promoter-reporter constructs, we tested the hypothesis, originally derived from studies of cortical neurons, that depolarization induces BDNF expression via a signaling pathway that includes Ca2+/calmodulin-dependent kinases (CaMKs) and the transcription factor, Ca2+/cyclic AMP response element binding protein (CREB). In contrast, we found that in SGNs in vivo BDNF expression is constitutive and is not increased by electrical activation. Similarly, BDNF expression in vitro is not increased by stimuli that activate CREB, including depolarization, cAMP, or transfection of activated CaMK mutants. However, transfection of dominant-negative CREB mutants did abrogate gene expression driven by BDNF promoters III and IV, indicating that CREB is necessary for constitutive BDNF expression. Thus, BDNF synthesis within SGNs makes possible an autocrine or paracrine mechanism that can contribute to support SGN survival but SGNs are distinctive in that this mechanism is constitutive and not activity-regulated.
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Affiliation(s)
- X M Zha
- Department of Biological Sciences, University of Iowa, Iowa City 52242-1324, USA
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Murer MG, Yan Q, Raisman-Vozari R. Brain-derived neurotrophic factor in the control human brain, and in Alzheimer's disease and Parkinson's disease. Prog Neurobiol 2001; 63:71-124. [PMID: 11040419 DOI: 10.1016/s0301-0082(00)00014-9] [Citation(s) in RCA: 624] [Impact Index Per Article: 27.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Brain-derived neurotrophic factor (BDNF) is a small dimeric protein, structurally related to nerve growth factor, which is abundantly and widely expressed in the adult mammalian brain. BDNF has been found to promote survival of all major neuronal types affected in Alzheimer's disease and Parkinson's disease, like hippocampal and neocortical neurons, cholinergic septal and basal forebrain neurons, and nigral dopaminergic neurons. In this article, we summarize recent work on the molecular and cellular biology of BDNF, including current ideas about its intracellular trafficking, regulated synthesis and release, and actions at the synaptic level, which have considerably expanded our conception of BDNF actions in the central nervous system. But our primary aim is to review the literature regarding BDNF distribution in the human brain, and the modifications of BDNF expression which occur in the brain of individuals with Alzheimer's disease and Parkinson's disease. Our knowledge concerning BDNF actions on the neuronal populations affected in these pathological states is also reviewed, with an aim at understanding its pathogenic and pathophysiological relevance.
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Affiliation(s)
- M G Murer
- Departamento de Fisiologia, Facultad de Medicina, Universidad de Buenos Aires, Paraguay.
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Affiliation(s)
- G Heinrich
- VA Northern California Health Care System and EBIRE, 150 Muir Road, Martinez, CA 94553, USA.
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12
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Morinobu S, Fujimaki K, Okuyama N, Takahashi M, Duman RS. Stimulation of adenylyl cyclase and induction of brain-derived neurotrophic factor and TrkB mRNA by NKH477, a novel and potent forskolin derivative. J Neurochem 1999; 72:2198-205. [PMID: 10217303 DOI: 10.1046/j.1471-4159.1999.0722198.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The present study was undertaken to examine whether NKH477, a novel and potent water-soluble forskolin derivative, stimulates adenylyl cyclase and regulates brain-derived neurotrophic factor (BDNF) and TrkB expression in the rat brain. Administration of NKH477 at a dose of 1.0 mg/kg, but not 0.1 mg/kg, increased levels of cyclic AMP (cAMP) in a time-dependent manner in frontal cortex and hippocampus. Repeated administration of NKH477 (1.0 mg/kg) for 7 or 14 days also increased levels of cAMP in these two brain regions, indicating that the response does not desensitize with chronic treatment. In addition, administration of NKH477 at the 1 mg/kg dose increased the expression of BDNF and TrkB mRNA in frontal cortex and hippocampus. This effect was observed after single, as well as repeated (7 or 14 days), administration of NKH477. These results demonstrate that NKH477 administration rapidly increases cAMP levels in brain and provides evidence that stimulation of this second messenger system increases the expression of BDNF and TrkB mRNA.
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Affiliation(s)
- S Morinobu
- Department of Psychiatry, Shiga University of Medical Science, Otsu, Japan
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13
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Timmusk T, Palm K, Lendahl U, Metsis M. Brain-derived Neurotrophic Factor Expression in VivoIs under the Control of Neuron-restrictive Silencer Element. J Biol Chem 1999. [DOI: 10.1016/s0021-9258(19)88378-3] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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