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https://www.readbyqxmd.com/read/28213524/g-protein-coupled-receptor-kinase-2-grk-2-regulates-serotonin-metabolism-through-the-monoamine-oxidase-amx-2-in-caenorhabditis-elegans
#1
Jianjun Wang, Jiansong Luo, Dipendra K Aryal, William C Wetzel, Richard Nass, Jeffrey L Benovic
G protein-coupled receptors (GPCRs) regulate many animal behaviors. GPCR signaling is mediated by agonist-promoted interactions of GPCRs with heterotrimeric G proteins, GPCR kinases (GRKs) and arrestins. To further elucidate the role of GRKs in regulating GPCR-mediated behaviors, we utilized the genetic model system Caenorhabditis elegans. Our studies demonstrate that grk-2 loss-of-function strains are egg-laying defective and contain low levels of serotonin (5-HT) and high levels of the 5-HT metabolite 5-hydroxyindole acetic acid (5-HIAA)...
February 17, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28213183/a-role-for-the-serotonin-reuptake-transporter-in-the-brain-and-intestinal-features-of-autism-spectrum-disorders-and-developmental-antidepressant-exposure
#2
REVIEW
Kara Gross Margolis
Many disease conditions considered CNS-predominant harbor significant intestinal comorbidities. Serotonin (5-HT) and the serotonin reuptake transporter (SERT) have increasingly been shown to play important roles in both brain and intestinal development and long-term function. 5-HT and SERT may thus modulate critical functions in the development and perpetuation of brain-gut axis disease. We discuss the potential roles of 5-HT and SERT in the brain and intestinal manifestations of autism spectrum disorders and developmental antidepressant exposure...
February 14, 2017: Journal of Chemical Neuroanatomy
https://www.readbyqxmd.com/read/28209599/role-of-shp2-protein-tyrosine-phosphatase-in-sert-inhibition-by-enteropathogenic-e-coli-epec
#3
Megha Singhal, Christopher Manzella, Vinay Soni, Waddah A Alrefai, Seema Saksena, Gail A Hecht, Pradeep K Dudeja, Ravinder K Gill
Enteropathogenic E. coli (EPEC), one of the diarrheagenic E. coli pathotypes, is among the most important food-borne pathogens infecting children worldwide. Inhibition of serotonin transporter (SERT), that regulates extracellular availability of serotonin (5-HT), has been previously implicated in EPEC-associated diarrhea. EPEC was shown to inhibit SERT via activation of protein tyrosine phosphatases (PTPase), albeit the specific PTPase involved is not known. Current studies aimed to identify EPEC activated PTPase and its role in SERT inhibition...
February 16, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28205278/optimal-dose-of-ramosetron-in-female-patients-with-irritable%C3%A2-bowel-syndrome-with-diarrhea-a-randomized-placebo-controlled-phase-ii-study
#4
S Fukudo, K Matsueda, K Haruma, M Ida, H Hayase, H Akiho, Y Nakashima, M Hongo
BACKGROUND: Previous studies showed that 5 μg of ramosetron, a serotonin (5-hydroxytryptamine: 5-HT)-3 receptor antagonist, is only effective in male patients with irritable bowel syndrome (IBS) with diarrhea (IBS-D). We hypothesized that either dose 1.25, 2.5, or 5 μg of ramosetron would be effective in female patients with IBS-D. METHODS: This randomized, double-blind, placebo-controlled, phase II dose-finding exploratory trial included 409 female outpatients with IBS-D treated in Japan...
February 16, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28203201/modulation-of-synaptic-plasticity-in-the-cortex-needs-to-understand-all-the-players
#5
REVIEW
Claire N J Meunier, Pascal Chameau, Philippe M Fossier
The prefrontal cortex (PFC) is involved in cognitive tasks such as working memory, decision making, risk assessment and regulation of attention. These functions performed by the PFC are supposed to rely on rhythmic electrical activity generated by neuronal network oscillations determined by a precise balance between excitation and inhibition balance (E/I balance) resulting from the coordinated activities of recurrent excitation and feedback and feedforward inhibition. Functional alterations in PFC functions have been associated with cognitive deficits in several pathologies such as major depression, anxiety and schizophrenia...
2017: Frontiers in Synaptic Neuroscience
https://www.readbyqxmd.com/read/28202785/behavioral-and-physiological-consequences-of-adult-brain-5-ht-depletion-in-mice
#6
José Patricio Casanova
No abstract text is available yet for this article.
February 15, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28201962/preparation-and-optimization-of-fast-dissolving-film-of-naratriptan-hydrochloride
#7
Krishna D Koradia, Pradip T Sidhdhapara, Navin R Sheth
BACKGROUND AND OBJECTIVE: Naratriptan is second-generation triptan class of antimigraine drug which selectively bind with 5-HT(1B/1D) receptor. It is widely used to treat the migraine attack due to its better tolerability and lower recurrence rate as compared to other triptans. Despite of the applicability, Naratriptan also have several drawback like slow onset of action and fist pass metabolism which reduce its efficacy. In order to increase the efficacy of naratriptan fast dissolving film is prepared...
February 12, 2017: Recent Patents on Drug Delivery & Formulation
https://www.readbyqxmd.com/read/28198447/the-tnf-%C3%AE-antagonist-etanercept-reverses-age-related-decreases-in-colonic-sert-expression-and-faecal-output-in-mice
#8
Bhavik Anil Patel, Sara Fidalgo, Chunfang Wang, Leena Parmar, Kasonde Mandona, Annabelle Panossian, Melanie S Flint, Richard N Ranson, M Jill Saffrey, Mark S Yeoman
Treatment for chronic constipation in older people is challenging and the condition has a major impact on quality of life. A lack of understanding about the causes of this condition has hampered the development of effective treatments. 5-HT is an important pro-kinetic agent in the colon. We examined whether alterations in colonic 5-HT signalling underlie age-related changes in faecal output in mice and whether these changes were due to an increase in TNF-α. Components of the 5-HT signalling system (5-HT, 5-HIAA, SERT) and TNF-α expression were examined in the distal colon of 3, 12, 18 and 24-month old mice and faecal output and water content monitored under control conditions and following the administration of etanercept (TNF-α inhibitor; 1 mg Kg(-1))...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28197555/biphasic-regulation-of-p38-mapk-by-serotonin-contributes-to-the-efficacy-of-stimulus-protocols-that-induce-long-term-synaptic-facilitation
#9
Yili Zhang, Paul Smolen, Douglas A Baxter, John H Byrne
The MAPK isoforms ERK and p38 MAPK are believed to play opposing roles in long-term synaptic facilitation (LTF) induced by serotonin (5-HT) in Aplysia. To fully understand their roles, however, it is necessary to consider the dynamics of ERK and p38 MAPK activation. Previous studies determined that activation of ERK occurred ∼45 min after a 5-min pulse of 5-HT treatment. The dynamics of p38 MAPK activation following 5-HT are yet to be elucidated. Here, the activity of p38 MAPK was examined at different times after 5-HT, and the interaction between the ERK and p38 MAPK pathways was investigated...
January 2017: ENeuro
https://www.readbyqxmd.com/read/28197551/ephrina5-signaling-is-required-for-the-distinctive-targeting-of-raphe-serotonin-neurons-in-the-forebrain
#10
Teng Teng, Afsaneh Gaillard, Aude Muzerelle, Patricia Gaspar
Serotonin (5-HT) neurotransmission in the brain relies on a widespread axon terminal network originating from the hindbrain raphe nuclei. These projections are topographically organized such that the dorsal (DR), and median raphe (MnR) nuclei have different brain targets. However, the guidance molecules involved in this selective targeting in development are unknown. Here, we show the implication of ephrinA5 signaling in this process. We find that the EphA5 gene is selectively expressed in a subset of 5-HT neurons during embryonic and postnatal development...
January 2017: ENeuro
https://www.readbyqxmd.com/read/28196966/effect-of-selective-5-ht6r-agonist-on-expression-of-5-ht-receptor-and-neurotransmitter-in-vascular-dementia-rats
#11
Haining Yu, Tao Chen, Li Zhou, Jiyou Tang
BACKGROUND 5-HT6 receptor (5-HT6R) has pluripotent roles regulating secretion of neurotransmitters. However, whether 5-HT6R is involved in the development of vascular dementia (VD) remains unclear. To evaluate the role and mechanism of 5-HT6R in VD, this study established a rat VD model to evaluate the effect of selective 5-HT6R agonist on the expression of 5-HT6R mRNA and neurotransmitter. MATERIAL AND METHODS Eighty healthy male SD rats (7 weeks old) were randomly assigned to sham, model, 5-HT6R agonist, and placebo groups (N=20 each)...
February 15, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28196617/the-neuropeptides-galanin-and-galanin-1-15-in-depression-like-behaviours
#12
REVIEW
Carmelo Millón, Antonio Flores-Burgess, Manuel Narváez, Dasiel O Borroto-Escuela, Belén Gago, Luis Santín, Estela Castilla-Ortega, José Ángel Narváez, Kjell Fuxe, Zaida Díaz-Cabiale
Galanin is a 29 amino acid neuropeptide widely distributed in neurons within the central nervous system. Galanin exerts its biological activities through three different G protein-receptors and participates in a number of functions, including mood regulation. Not only Galanin but also Galanin N-terminal fragments like Galanin(1-15) are active at the central level. In this work, we review the latest findings in studies on Galanin and Galanin(1-15) in depression-related behaviours. Our focus is on animal models for depression, and we pay some attention to research data obtained in human studies...
January 31, 2017: Neuropeptides
https://www.readbyqxmd.com/read/28194935/a-potential-pet-radiotracer-for-the-5-ht2c-receptor-synthesis-and-in-vivo-evaluation-of-4-3-18-f-fluorophenethoxy-pyrimidine
#13
Juhyeon Kim, Byung Seok Moon, Byung Chul Lee, Ho-Young Lee, Hak Joong Kim, Hyunah Choo, Ae Nim Pae, Yong Seo Cho, Sun-Joon Min
The serotonin 2C receptor subtype (5-HT2C) is an excitatory 5-HT receptor widely distributed throughout the central nerve system. As the 5-HT2C receptor displays multiple actions on various neurotransmitter systems including glutamate, dopamine, epinephrine and -aminobutyric acid (GABA), abnormalities of the 5-HT2C receptor are associated with psychiatric diseases such as depression, schizophrenia, drug abuse, and anxiety. Up to date, three kinds of 5-HT2C PET radiotracers such as [11C]N-methylated arylazepine (1), [11C]WAY-163909 (2), [18F]fluorophenylcyclopropane (3) have been developed, but they may not be suitable for in vivo 5-HT2C imaging study due to their modest specific binding...
February 14, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28193320/transient-inhibition-and-long-term-facilitation-of-locomotion-by-phasic-optogenetic-activation-of-serotonin-neurons
#14
Patrícia A Correia, Eran Lottem, Dhruba Banerjee, Ana S Machado, Megan R Carey, Zachary F Mainen
Serotonin (5-HT) is associated with mood and motivation but the function of endogenous 5-HT remains controversial. Here, we studied the impact of phasic optogenetic activation of 5-HT neurons in mice over time scales from seconds to weeks. We found that activating dorsal raphe nucleus (DRN) 5-HT neurons induced a strong suppression of spontaneous locomotor behavior in the open field with rapid kinetics (onset ≤1 s). Inhibition of locomotion was independent of measures of anxiety or motor impairment and could be overcome by strong motivational drive...
February 14, 2017: ELife
https://www.readbyqxmd.com/read/28188354/simultaneous-extraction-and-determination-of-monoamine-neurotransmitters-in-human-urine-for-clinical-routine-testing-based-on-a-dual-functional-solid-phase-extraction-assisted-by-phenylboronic-acid-coupled-with-liquid-chromatography-tandem-mass-spectrometry
#15
Xiaoguang Sunny Li, Shu Li, Gottfried Kellermann
The major monoamine neurotransmitters, serotonin (5-HT) and catecholamines (i.e., norepinephrine (NE), epinephrine (E), and dopamine (DA)), are critical to the nervous system function, and imbalances of the neurotransmitters have been connected to a variety of diseases, making their measurement useful in a clinical setting. A simple, rapid, robust, sensitive, and specific LC-MS/MS method has been developed and validated for the simultaneous quantitation of urinary serotonin and catecholamines with low cost, which is ideal for routine clinical applications...
February 10, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28188220/cannabinoids-activate-monoaminergic-signaling-to-modulate-key-c-elegans-behaviors
#16
Mitchell Oakes, Wen Jing Law, Tobias Clark, Bruce Bamber, Richard Komuniecki
Cannabis or marijuana, a popular recreational drug, alters sensory perception and exerts a range of potential medicinal benefits. The present study demonstrates that the endogenous cannabinoid receptor agonists, 2-arachidonoylglycerol (2-AG) and anandamide (AEA) activate a canonical cannabinoid receptor in C. elegans and also modulate monoaminergic signaling at multiple levels. 2-AG or AEA inhibit nociception and feeding through a pathway requiring the cannabinoid-like receptor, NPR-19. 2-AG or AEA activate NPR-19 directly and cannabinoid-dependent inhibition can be rescued in npr-19 null animals by the expression of a human cannabinoid receptor, CB1, highlighting the orthology of the receptors...
February 10, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28185964/experimental-occlusal-disharmony-a-promoting-factor-for-anxiety-in-rats-under-chronic-psychological-stress
#17
Xuan Tang, Jian Li, Ting Jiang, Shu-Hui Han, Dong-Yuan Yao
BACKGROUND AND PURPOSE: Clinically, patients under chronic psychological stress (PS) appear to be more susceptible to occlusal disharmony (OD) compared with those without PS. OD was proved to introduce anxiety-like stress. Therefore, the purpose of the study was to investigate whether OD would affect psychological stress-induced anxiety and its underlying mechanisms. METHODS: Chronic PS was induced by a communication box, and OD was produced by bonding a 0.3mm-thick crown on the right maxillary first molar of male Sprague-Dawley rats...
February 7, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28182676/the-swimming-test-is-effective-for-evaluating-spasticity-after-contusive-spinal-cord-injury
#18
Youngjae Ryu, Toru Ogata, Motoshi Nagao, Taku Kitamura, Kazuhito Morioka, Yoshinori Ichihara, Toru Doi, Yasuhiro Sawada, Masami Akai, Ryohei Nishimura, Naoki Fujita
Spasticity is a frequent chronic complication in individuals with spinal cord injury (SCI). However, the severity of spasticity varies in patients with SCI. Therefore, an evaluation method is needed to determine the severity of spasticity. We used a contusive SCI model that is suitable for clinical translation. In this study, we examined the feasibility of the swimming test and an EMG for evaluating spasticity in a contusive SCI rat model. Sprague-Dawley rats received an injury at the 8th thoracic vertebra...
2017: PloS One
https://www.readbyqxmd.com/read/28179558/cell-specific-pkm-isoforms-contribute-to-the-maintenance-of-different-forms-of-persistent-long-term-synaptic-plasticity
#19
Jiangyuan Hu, Kerry Adler, Carole Abi Farah, Margaret H Hastings, Wayne S Sossin, Samuel Schacher
Multiple kinase activations contribute to long-term synaptic plasticity, a cellular mechanism mediating long-term memory. The sensorimotor synapse of Aplysia expresses different forms of long-term facilitation (LTF) - non-associative and associative LTF - that require the timely activation of kinases, including PKC. It is not known which PKC isoforms in the sensory neuron or motor neuron L7 are required to sustain each form of LTF. We show that different PKMs, the constitutively active isoforms of PKCs generated by calpain cleavage, in the sensory neuron and L7 are required to maintain each form of LTF...
February 8, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28167465/co-treatment-with-imipramine-averted-haloperidol-instigated-tardive-dyskinesia-association-with-serotonin-in-brain-regions
#20
Noreen Samad, Farzana Yasmin, Darakhshan Jabeen Haleem
Outcome of imipramine (IMI) treatment was scrutinized on progression of haloperidol instigated tardive dyskinesia (TD). 0.2 mg/kg/rat dosage of haloperidol provided orally to rats for 2 weeks enhanced vacuous chewing movements that escalated when the process proceeded for 5 weeks. Following 2 weeks co-injection 5 mg/kg dosage of IMI was diminished haloperidol-instigated VCMs and fully averted following five weeks. The potency of 8-OH-DPAT-instigated locomotor activity exhibited higher in saline+haloperidol treated rats while not observed in IMI+ haloperidol treated rats...
November 2016: Pakistan Journal of Pharmaceutical Sciences
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