Effect of a 5-HT2C serotonin agonist, dexnorfenfluramine, on amyloid precursor protein metabolism in guinea pigs
Abstract
Stimulation of serotonin receptor subtypes 5-HT(2A) or 5-HT(2C) in stably transfected 3T3 cells by dexnorfenfluramine (DEXNOR) or serotonin increases secretion of the APP metabolite APP(s). It is not known whether activation of these receptors can also affect APP metabolism in vivo. We examined the effects of a single intraperitoneal (i.p.) injection of DEXNOR on APP(s) levels in cerebrospinal fluid (CSF) of guinea pigs. These levels were significantly (P<0.05) increased by a single dose of DEXNOR (1-4 mg/kg); those of the APP metabolites Abeta(1-40) and Abeta(1-42) were unaffected. The DEXNOR-induced (1 mg/kg) increases in CSF APP(s) were suppressed by ritanserin (1 mg/kg) but not by ketanserin (2 mg/kg). When given alone, ritanserin did not affect CSF levels of APP(s), Abeta(1-40), or Abeta(1-42). Chronic treatment with DEXNOR for 9 days (1 mg/kg bid, i.p.) increased CSF APP(s) levels, measured 2 h after the last injection (P<0.05), and decreased those of CSF Abeta(1-42) (P<0.05). Neither hippocampal nor cortical levels of the APP holoprotein (APP(h)), nor body weight, were affected by DEXNOR. Chronic administration of mCPP (1-(m-chlorophenyl)piperazine) (2 mg/kg bid, i.p.), a 5-HT(2B/2C) agonist, for 9 days also increased CSF APP(s) levels (P<0.5) when measured 2 h after the drug's last administration; hippocampal and cortical APP(h) levels were unaffected. However, mCPP also caused a significant decrease in body weight gain. These data indicate that the pharmacological ac…
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Activation of select 5HT-Rs increases nonamyloidogenic processing of APP in vitro.
“Activation of select 5HT-Rs increases nonamyloidogenic processing of APP in vitro (14–16)”
From Serotonin signaling is associated with lower amyloid-β levels and plaques in transgenic mice and humans (2011) · cites this paper as [15]
Cites
Nitsch, R. M., Slack, B. E., Wurtman, R. J., & Growdon, J. H. (1992) · Science · doi:10.1126/science.1411529 · Cited by 898 · see citing works
Self-citationMattson, M. P., Cheng, B., Culwell, A. R., Esch, F. S., Lieberburg, I. M., & Rydel, R. E. (1993) · Neuron · doi:10.1016/0896-6273(93)90315-i · Cited by 795 · see citing works
Activation of protein kinase C inhibits cellular production of the amyloid beta-protein.
Hung, A. Y., Haass, C., Nitsch, R. M., Qiu, W. Q., Citron, M., Wurtman, R. J., Growdon, J. H., & Selkoe, D. J. (1993) · Journal of Biological Chemistry · doi:10.1016/s0021-9258(19)49409-x · Cited by 399 · see citing works
Self-citationMéziane, H., Dodart, J., Mathis, C., Little, S. H., Clemens, J. A., Paul, S. M., & Ungerer, A. (1998) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.95.21.12683 · Cited by 355 · see citing works
Johnstone, E. M., Chaney, M. O., Norris, F. H., Pascual, R. V., & Little, S. H. (1991) · Molecular Brain Research · doi:10.1016/0169-328x(91)90088-f · Cited by 312 · see citing works
5-HT1c receptor is a prominent serotonin receptor subtype in the central nervous system.
Molineaux, S. M., Jessell, T. M., Axel, R., & Julius, D. J. (1989) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.86.17.6793 · Cited by 261 · see citing works
Roch, J., Masliah, E., Roch‐Levecq, A., Sundsmo, M. P., Otero, D. A., Veinbergs, I., & Saitoh, T. (1994) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.91.16.7450 · Cited by 255 · see citing works
Serotonin 5-HT2a and 5-HT2c Receptors Stimulate Amyloid Precursor Protein Ectodomain Secretion
Nitsch, R. M., Deng, M., Growdon, J. H., & Wurtman, R. J. (1996) · Journal of Biological Chemistry · doi:10.1074/jbc.271.8.4188 · Cited by 219 · see citing works
Self-citationNeurochemical mechanism of action of drugs which modify feeding via the serotoninergic system
Garattini, S. K., Mennini, T., Bendotti, C., Invernizzi, R. W., & SAMANIN, R. (1986) · Appetite · doi:10.1016/s0195-6663(86)80050-2 · Cited by 192 · see citing works
Qiu, W. W. Q., Ferreira, A., Miller, C., Koo, E., & Selkoe, D. (1995) · Journal of Neuroscience · doi:10.1523/jneurosci.15-03-02157.1995 · Cited by 190 · see citing works
Two distinct serotonin receptors: regional variations in receptor binding in mammalian brain
Peroutka, S. J., & Snyder, S. H. (1981) · Brain Research · doi:10.1016/0006-8993(81)90562-x · Cited by 176 · see citing works
Serotonin-releasing effects of substituted piperazines in vitro
Pettibone, D. J., & Williams, M. J. (1984) · Biochemical Pharmacology · doi:10.1016/0006-2952(84)90424-6 · Cited by 102 · see citing works
Lee, R. K. K., Knapp, S., & Wurtman, R. J. (1999) · Journal of Neuroscience · doi:10.1523/jneurosci.19-03-00940.1999 · Cited by 85 · see citing works
Self-citationComparative studies on the anorectic activity of d-fenfluramine in mice, rats, and guinea pigs
Mennini, T., Bizzi, A., Caccia, S., Codegoni, A., Fracasso, C., Frittoli, E., Guiso, G., Padura, I. M., Taddei, C., Uslenghi, A., et al. (1991) · Naunyn-Schmiedeberg s Archives of Pharmacology · doi:10.1007/bf00169550 · Cited by 79 · see citing works
Reduction of cerebrospinal fluid amyloid β after systemic administration of M1 muscarinic agonists
Beach, T. G., Walker, D. G., Potter, P. E., Sue, L. I., & Fisher, A. (2001) · Brain Research · doi:10.1016/s0006-8993(01)02484-2 · Cited by 66 · see citing works
Serotonin 5‐HT2C Receptor Stimulates Cyclic GMP Formation in Choroid Plexus
Kaufman, M. J., Hartig, P. R., & Hoffman, B. J. (1995) · Journal of Neurochemistry · doi:10.1046/j.1471-4159.1995.64010199.x · Cited by 61 · see citing works
Stimulation of amyloid precursor protein synthesis by adrenergic receptors coupled to cAMP formation
Lee, R. K. K., Araki, W., & Wurtman, R. J. (1997) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.94.10.5422 · Cited by 51 · see citing works
Self-citationAmyloid precursor protein in guinea pigs — complete cDNA sequence and alternative splicing
Beck, M., Müller, D., & Bigl, V. (1997) · Biochimica et Biophysica Acta (BBA) - Gene Structure and Expression · doi:10.1016/s0167-4781(96)00232-1 · Cited by 35 · see citing works
Alzheimer's disease: the tacrine legacy
Kelly, J. S. (1999) · Trends in Pharmacological Sciences · doi:10.1016/s0165-6147(99)01344-9 · Cited by 28 · see citing works
Spedding, M., Ouvry, C., Millan, M. J., Duhault, J., Dacquet, C., & Wurtman, R. J. (1996) · Nature · doi:10.1038/380488a0 · Cited by 22 · see citing works
Self-citationBeck, M., Brückner, M. K., Holzer, M., Kaap, S., Pannicke, T., Arendt, T., & Bigl, V. (1999) · Neuroscience · doi:10.1016/s0306-4522(99)00390-5 · Cited by 21 · see citing works
A safe and simple technique for obtaining cerebrospinal fluid from rabbits.
Rk, K., & Jf, P. (1979) · PubMed · Cited by 14 · see citing works
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Cirrito, J. R., Disabato, B. M., Restivo, J. L., Verges, D. K., Goebel, W. D., Sathyan, A., Hayreh, D., D'Angelo, G., Benzinger, T., Yoon, H., et al. (2011) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1107411108 · Cited by 370 · see citing works
The role of G protein-coupled receptors in the pathology of Alzheimer's disease
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The serotonergic system in ageing and Alzheimer's disease
Rodriguez, J. J., Noristani, H. N., & Verkhratsky, A. (2012) · Progress in Neurobiology · doi:10.1016/j.pneurobio.2012.06.010 · Cited by 266 · see citing works
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Sheline, Y., West, T., Yarasheski, K., Swarm, R., Jasielec, M. S., Fisher, J. R., Ficker, W. D., Yan, P., Xiong, C., Frederiksen, C., et al. (2014) · Science Translational Medicine · doi:10.1126/scitranslmed.3008169 · Cited by 238 · see citing works
The role of serotonin in memory: interactions with neurotransmitters and downstream signaling
Seyedabadi, M., Fakhfouri, G., Ramezani, V., Mehr, S. E., & Rahimian, R. (2014) · Experimental Brain Research · doi:10.1007/s00221-013-3818-4 · Cited by 137 · see citing works
Enhanced Prospects for Drug Delivery and Brain Targeting by the Choroid Plexus–CSF Route
Johanson, C. E., Duncan, J. A., Stopa, E. G., & Baird, A. (2005) · Pharmaceutical Research · doi:10.1007/s11095-005-6039-0 · Cited by 128 · see citing works
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Chakraborty, S., Lennon, J. C., Malkaram, S. A., Zeng, Y., Fisher, D. W., & Dong, H. (2019) · Neuroscience Letters · doi:10.1016/j.neulet.2019.03.050 · Cited by 123 · see citing works
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Gudmundsson, P., Skoog, I. G., Wærn, M., Blennow, K., Palsson, S. P., Rosengren, L., & Gustafson, D. (2007) · American Journal of Geriatric Psychiatry · doi:10.1097/jgp.0b013e3180547091 · Cited by 112 · see citing works
G Protein-Coupled Receptors (GPCRs) in Alzheimer’s Disease: A Focus on BACE1 Related GPCRs
Zhao, J., Deng, Y., Jiang, Z., & Qing, H. (2016) · Frontiers in Aging Neuroscience · doi:10.3389/fnagi.2016.00058 · Cited by 108 · see citing works
Werry, T. D., Gregory, K. J., Sexton, P. M., & Christopoulos, A. (2005) · Journal of Neurochemistry · doi:10.1111/j.1471-4159.2005.03161.x · Cited by 89 · see citing works
Drug Repositioning Approaches for the Discovery of New Therapeutics for Alzheimer's Disease
Kim, T. (2014) · Neurotherapeutics · doi:10.1007/s13311-014-0325-7 · Cited by 82 · see citing works
Amyloid Hypothesis: Is There a Role for Antiamyloid Treatment in Late-Life Depression?
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Fisher, J. R., Wallace, C. E., Tripoli, D. L., Sheline, Y. I., & Cirrito, J. R. (2016) · Molecular Neurodegeneration · doi:10.1186/s13024-016-0112-5 · Cited by 79 · see citing works
SAR of psilocybin analogs: Discovery of a selective 5-HT2C agonist
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Cheng, X., Wu, J., Geng, M., & Xiong, J. (2013) · Neurobiology of Aging · doi:10.1016/j.neurobiolaging.2013.11.021 · Cited by 48 · see citing works
Morse, L. J., Payton, S. M., Cuny, G. D., & Rogers, J. T. (2004) · Journal of Molecular Neuroscience · doi:10.1385/jmn:24:1:129 · Cited by 47 · see citing works
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Imipramine and citalopram facilitate amyloid precursor protein secretion in vitro
PAKASKI, M., BJELIK, A., HUGYECZ, M., KASA, P., JANKA, Z., & KALMAN, J. (2005) · Neurochemistry International · doi:10.1016/j.neuint.2005.03.004 · Cited by 43 · see citing works
Aging, cortical injury and Alzheimer's disease-like pathology in the guinea pig brain
Bates, K. A., Vink, R., Martins, R. N., & Harvey, A. R. (2013) · Neurobiology of Aging · doi:10.1016/j.neurobiolaging.2013.11.020 · Cited by 31 · see citing works
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Lee, J., Jung, M. E., & Lee, J. (2010) · Expert Opinion on Therapeutic Patents · doi:10.1517/13543776.2010.518956 · Cited by 29 · see citing works
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Zong, B., Yu, F., Zhang, X., Zhao, W., Sun, P., Li, S., & Li, L. (2022) · Frontiers in Aging Neuroscience · doi:10.3389/fnagi.2022.869507 · Cited by 29 · see citing works
Grimwood, S., Hogg, J. E., Jay, M. T., Lad, A. M., Lee, V. S., Murray, F., Peachey, J., Townend, T., Vithlani, M., Beher, D., et al. (2005) · Neuropharmacology · doi:10.1016/j.neuropharm.2005.01.016 · Cited by 25 · see citing works
Bishop, M. J., & Nilsson, B. M. (2003) · Expert Opinion on Therapeutic Patents · doi:10.1517/13543776.13.11.1691 · Cited by 22 · see citing works
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Brüge, A., Ponimaskin, E. G., & Labus, J. (2025) · Pharmacological Reviews · doi:10.1016/j.pharmr.2025.100071 · Cited by 12 · see citing works
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Bianco, O. A. F. M., Manzine, P. R., Nascimento, C. M. C., Vale, F. A. C., Pavarini, S. C. I., & Cominetti, M. R. (2015) · International Psychogeriatrics · doi:10.1017/s1041610215001842 · Cited by 11 · see citing works
von Linstow, C. V., Waider, J., Bergh, M. S.-S., Anzalone, M., Madsen, C. N., Nicolau, A., Wirenfeldt, M., Lesch, K., & Finsen, B. (2021) · Journal of Alzheimer's Disease · doi:10.3233/jad-210581 · Cited by 12 · see citing works
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Li, G., Li, F., Tang, Y., Guo, S., Yao, Y., Yuan, F., Zhang, B., Jiang, Y. Y., Wang, J., Wu, D., et al. (2025) · MedComm · doi:10.1002/mco2.70556 · Cited by 6 · see citing works
Activation of 5-HT2C Receptor Promotes the Expression of Neprilysin in U251 Human Glioma Cells
Tian, X.-L., Yu, L., Li, W.-Q., Hu, Y. H., Yin, M., & Wang, Z. (2014) · Cellular and Molecular Neurobiology · doi:10.1007/s10571-014-0138-6 · Cited by 6 · see citing works
Computer-Aided Drug Design Approaches to Study Key Therapeutic Targets in Alzheimer’s Disease
Lemos, A., Melo, R., Moreira, I. S., & Cordeiro, M. N. D. S. (2017) · Neuromethods · doi:10.1007/978-1-4939-7404-7_3 · Cited by 4 · see citing works
GPCR, a rider of Alzheimer’s disease
Liu, X., & Zhao, J. (2011) · Frontiers in Biology · doi:10.1007/s11515-011-1129-3 · Cited by 2 · see citing works
Guo, L., Zhang, J., Yan, Q.-X., & Yin, M. (2011) · Human Cell · doi:10.1007/s13577-011-0014-3 · Cited by 2 · see citing works
Neurotoxic Oxidative Metabolite of Serotonin
Volicer, L., Wrona, M. Z., Matson, W. R., & Dryhurst, G. (2007) · Humana Press eBooks · doi:10.1007/978-1-59259-888-5_8 · Cited by 2 · see citing works
The potential use of natural killer cells to treat Alzheimer's disease: Can nutrition play a role?
Dong, A., Huang, Y., Chen, H., Liu, R., Wu, W., Gao, H., Wang, C., Yu, J., & Wang, L. (2024) · eFood · doi:10.1002/efd2.145 · Cited by 1 · see citing works
Fakih, N., & Fakhoury, M. (2024) · Journal of Psychiatric Practice · doi:10.1097/pra.0000000000000779 · Cited by 1 · see citing works
Yeast as a Model for Studying Aβ Aggregation, Toxicity and Clearance
Bharadwaj, P. (2011) · Australasian Journal of Paramedicine · Cited by 1 · see citing works
Regulation of biochemical pathways involved in neurodegeneration
Pooler, A. M. (2005) · DSpace@MIT (Massachusetts Institute of Technology)
Self-citationActivation of 5-HT 2C Receptor Promotes the Expression of Neprilysin in U251 Human Glioma Cells
Wang, Y. H. Y.-J. (2015)
Förstl, H. (2005) · Steinkopff eBooks · doi:10.1007/3-7985-1537-9_5
BindingDB Entry 50016618: SAR of psilocybin analogs: discovery of a selective 5-HT 2C agonist.
BindingDB (2009) · UC San Diego · doi:10.7270/q2pz58b5
Serotonergic Signaling Pathways that Suppress Amyloid Beta in Mouse Models of AD
Fisher, J. R. (2014) · Open Scholarship Institutional Repository (Washington University in St. Louis) · doi:10.7936/k74f1nr2
- Authors
- Arjona, A. A., Pooler, A. M., Lee, R. K., & Wurtman, R. J.
- Affiliations
- Massachusetts Institute of Technology (US)
- Harvard University (US)
- Corresponding author
- Wurtman, Richard J
- ORCID
- Pooler, Amy M
- Venue
- Brain Research
- Publisher
- Elsevier BV
- Published
- 2002-09
- Volume
- 951
- Issue
- 1
- Pages
- 135-140
- ISSN
- 0006-8993 (ISSN-L)
- OpenAlex
- W1970371846
- Cited by
- 52
- References
- 23
- Citations by year
- 2025: 3 · 2024: 2 · 2022: 2 · 2021: 1 · 2020: 2 · 2019: 3 · 2017: 2 · 2016: 4 · 2015: 2 · 2014: 5 · 2013: 2 · 2012: 1
- FWCI
- 2.20
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Brain Research (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute of Mental Health (MH 28783)
- Topics
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
- Keywords
- 5-HT2C receptor, dexfenfluramine, amyloid precursor protein, cerebrospinal fluid, amyloid-beta, 5-HT2A receptor, ritanserin, ketanserin, mCPP, Alzheimer's disease, weight gain, hippocampus, cortex
- MeSH terms
- Alzheimer Disease, Animals, Body Weight, Brain, Cerebral Cortex, Dose-Response Relationship, Drug, Drug Interactions, Guinea Pigs, Hippocampus, Ketanserin, Male, Norfenfluramine, Peptide Fragments, Receptors, Serotonin, Serotonin, Amyloid beta-Peptides, Amyloid beta-Protein Precursor, Ritanserin, Selective Serotonin Reuptake Inhibitors, Receptor, Serotonin, 5-HT2C
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