2020 Annual Meeting POSTER ABSTRACTS

Total Page:16

File Type:pdf, Size:1020Kb

2020 Annual Meeting POSTER ABSTRACTS ASCP 2020 Annual Meeting POSTER ABSTRACTS (18 more at www.ascpmeeting.org) Disclaimer: The content displayed in these publications is that of the presenters and does not necessarily reflect the opinions of the American Society of Clinical Psychopharmacology (ASCP) or Physicians Postgraduate Press, Inc. All materials were provided by ASCP. The presenters hold the copyright. Friday, May 29, 2020 Poster Session I F1. LONG-TERM EFFICACY AND SAFETY OF LEMBOREXANT IN ADULTS WITH INSOMNIA DISORDER: RESULTS ACROSS 12 MONTHS FROM SUNRISE- 2 Jane Yardley1, Mikko Kärppä2, Yuichi Inoue3, Kate Pinner1, Carlos Perdomo1, Gleb Filippov1, Kohei Ishikawa1, Naoki Kubota1, Margaret Moline*1 1Eisai Co, Ltd., 2Oulo University Hospital and University of Oulu, 3Tokyo Medical University, Abstract: Introduction: Lemborexant (LEM) is a dual orexin receptor antagonist (DORA) recently approved in the US and Japan for treatment of insomnia (Rosenberg et al, 2019; Hoyer et al, 2018). SUNRISE-2 (NCT02952820; E2006-G000-303) was a Phase 3 study that demonstrated significant benefit of LEM versus placebo (PBO) on patient-reported (subjective) sleep onset and maintenance outcomes. Here we present the 12-month efficacy and safety data for LEM from SUNRISE-2. Methods: This randomized, double-blind, placebo-controlled (first 6 months [Treatment Period 1]), 12-month global Phase 3 study enrolled adults aged ≥18y with insomnia disorder defined per DSM-5 criteria. During Treatment Period 1, subjects were randomized to PBO or LEM (5mg, [LEM5]; 10mg, [LEM10]). During Treatment Period 2 (second 6 months), PBO subjects were re-randomized to LEM5 or LEM10 (not reported here) and LEM subjects continued with their assigned dose. Changes from baseline in subjective sleep parameters (sleep onset latency [sSOL], sleep efficiency [sSE], wake after sleep onset [sWASO]) were calculated based on sleep diary data. P-values were based on mixed-effect repeated measurement analysis evaluating least squares mean treatment differences for placebo versus LEM at Month 6. Results: The Full Analysis Set included 949 subjects (Period 1: Placebo, n=318; LEM5, n=316; LEM10, n=315). At the end of Treatment Period 1 (Month 6) 251 and 226 subjects continued LEM5 and LEM10, respectively. Median sSOL (min) was significantly decreased (improved) with LEM5 (−21.8) and LEM10 (−28.2) versus PBO (−11.4; both P<0.0001) at Month 6; improvements were sustained at Month 12 (LEM5, −25.9; LEM10, −33.6). Mean (SD) increases in sSE (%) were significantly greater (improved) with LEM5 (15.3 [14.6]) and LEM10 (15.6 [15.6]) versus PBO (10.4 [13.8]; both P≤0.0001) at Month 6; increases were maintained at Month 12 (LEM5, 15.8 [14.4]; LEM10, 17.9 [16.1]). Mean (SD) decreases in sWASO (min) were significantly greater with LEM5 (−51.5 [67.3]) and LEM10 (−48.1 [68.6]) versus PBO (−32.1 [55.3]; P<0.001, P<0.05, respectively) at Month 6; decreases were maintained at Month 12 (LEM5, −53.1 [61.5]; LEM10, −58.0 [71.1]). The majority of treatment-emergent adverse events (TEAEs) were mild or moderate. The most common TEAEs across the year of treatment (occurring in >10% for either LEM group), with LEM5 and LEM10, respectively, were nasopharyngitis (13.7%, 13.4%), somnolence (9.6%, 14.3%), and headache (11.1%, 9.2%). No deaths were reported. Conclusions: Improvements to subjective sleep outcomes observed with LEM at 6 months were sustained over 12 months; LEM was well tolerated. These data from SUNRISE-2 suggest that LEM is a potential long-term treatment option for patients with chronic insomnia. 1 SUPPORT: Eisai Inc. F2. PUBLIC IMAGE AND SENTIMENT TOWARD THE PHARMACEUTICAL INDUSTRY: WHAT CAN WE DO TO REVERSE THE NEGATIVE TREND? Charles Wilcox*1 1Praxis Research Consulting Abstract: In late 2019 a Gallup poll reported that the pharmaceutical industry surpassed the oil industry, hitting "rock bottom," in terms of (public) trust. This fact has an undisputed negative impact on both clinical trial recruitment and enrollment; it may also adversely affect retention as well. There are numerous causes and widely publicized examples of behaviors and incidents perpetuating this public sentiment. Strangely, only recently have some excellent public relations efforts and public service announcements (e.g., PSAs) been conceptualized and implemented in an effort to improve the public awareness of, and respect for, our industry, especially as it relates to the clinical research process. In 2014 the European Union (EU) Clinical Trial Regulation requiring Layperson/Plain Language Summaries (PLS) was passed and slated for implementation in 2018; however, due to patient portal-related "technical difficulties," mandatory implementation has been deferred until 2020. Here in the United States, many sponsors have evaluated the pros and cons, as well as the projected costs and perceived benefits, of a voluntary pro-active implementation of a PLS strategy. As of this date, while TransCelerate has published a document titled "Layperson Summaries of Clinical Trials: An Implementation Guide (with recommendations on how to do so in a non-promotional manner)," we remain far from a comprehensive and/or quasi- standardized strategy for the PLS creation and distribution processes. Moreover, voluntary, pro-active, compliance with and/or implementation of a PLS strategy is "low hanging fruit," when it comes to an industry-wide opportunity to help ameliorate the widely-embraced "distrust," as well as better inform and educate our trial participants. This poster presentation will concisely provide publicly accessible resources to help guide smaller companies through the mine-fields of allegations regarding potential "pre-promotional" wrongdoing; it will also highlight how an effective creation and implementation of a PLS strategy will prove to be an exceedingly cost-effective long-term "voluntary" strategy. Furthermore, in the wake of such rampant public distrust, being fueled even further by politics throughout this election year, the timing of this opportunity to further educate and inform trial participants as well as enhance our public image, will also have a positive immediate- and long- term measurable impact on enrollment! While delay is preferable to error(s) in implementation, the 2014 passage of the first applicable- to-PLS regulation has provided us with sufficient time --- and, now published guidelines --- to move forward without further delay. As sponsors, sites and CROs working together vis-a-vis a PLS dissemination process, we can not only utilize this as an opportunity to "Thank" patients, we can do so in a manner which also better educates them whilst bolstering their trust in us. Finally, it will also translate into a heightened willingness to possibly "volunteer again" and potentially "refer-a-friend"!! 2 F3. WHY ARE WE SWITCHING? A RETROSPECTIVE CHART REVIEW STUDY OF REASONS FOR ANTIPSYCHOTIC SWITCH AMONGST FIRST- AND SECOND- GENERATION ANTIPSYCHOTICS Kaksha Varma*1, Daniel Guinart1, Nahal Talasazan1, Georgios Schoretsanitis1, John M. Kane1 1The Zucker Hillside Hospital Abstract: Background and objectives: Antipsychotics are the cornerstone of successful acute treatment and relapse prevention in psychotic disorders. However, despite their efficacy, antipsychotics are prone to frequent switches (1). Previous literature exploring the reasons leading physicians to switch antipsychotic treatments point towards the lack of tolerability/side effects (2). However, the relationship between antipsychotic generation (first- (FGA) vs. second-generation (SGA)) and reasons for medication switch have been less frequently studied. Thus, we aimed to review and characterize antipsychotic medication switches and examine their potential relationship with antipsychotic generation (FGA vs. SGA). Methods: We conducted a systematic retrospective chart review in order to extract data on antipsychotic medication switch for patients treated in the inpatient and outpatient units at the Zucker Hillside Hospital, New York between August 2017 and August 2018. Reasons for every switch were independently extracted by two investigators and categorized to: side effects, lack of efficacy, insurance problems, symptom remission, patient preference, poor adherence, and other. Comparisons between FGA vs. SGA were analyzed using chi-square tests (χ2) with a significance level of 0.05. Statistical analyses were carried out using IBM SPSS Statistics version 12.0. Results: 400 charts were reviewed. 167 antipsychotic switches were detected, of which 159 reported reasons for the switch. A total of 65/159 switches (40.9%) were detected in males and 94/159 (59.1%) in females. 89/159 (56.0%) were reported in white subjects, 46/159 (28.9%) in African American, 16/159 (10.1%) in Asians, 4/159 (2.5%) in subjects of mixed race and race was not provided in 2/159 (1.3%). Regarding the type of antipsychotic, 16/159 (10.1%) were FGA switches, whereas 143/159 (89.9%) were SGA switches. Our analysis showed no significant differences in reasons for switch based on antipsychotic generation (X2= 2.1, p= 0.909). The most common reason for switching overall was found to be side effects, n= 75 (47.2%), followed by a lack of efficacy, n= 34 (21.4%). Patient preference accounted for 23 (14.5%) of the switches, and poor adherence accounted for 12 (7.5%). Additionally, insurance problems accounted for 6 (3.8 %). Symptom remission was listed in 1 (0.6%) case and the remaining 8 (5.0%) were for other reasons. Conclusion: In our sample, the majority of antipsychotic switches were related to side effects.
Recommended publications
  • Methylphenidate Amplifies the Potency and Reinforcing Effects Of
    ARTICLE Received 1 Aug 2013 | Accepted 7 Oct 2013 | Published 5 Nov 2013 DOI: 10.1038/ncomms3720 Methylphenidate amplifies the potency and reinforcing effects of amphetamines by increasing dopamine transporter expression Erin S. Calipari1, Mark J. Ferris1, Ali Salahpour2, Marc G. Caron3 & Sara R. Jones1 Methylphenidate (MPH) is commonly diverted for recreational use, but the neurobiological consequences of exposure to MPH at high, abused doses are not well defined. Here we show that MPH self-administration in rats increases dopamine transporter (DAT) levels and enhances the potency of MPH and amphetamine on dopamine responses and drug-seeking behaviours, without altering cocaine effects. Genetic overexpression of the DAT in mice mimics these effects, confirming that MPH self-administration-induced increases in DAT levels are sufficient to induce the changes. Further, this work outlines a basic mechanism by which increases in DAT levels, regardless of how they occur, are capable of increasing the rewarding and reinforcing effects of select psychostimulant drugs, and suggests that indivi- duals with elevated DAT levels, such as ADHD sufferers, may be more susceptible to the addictive effects of amphetamine-like drugs. 1 Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, USA. 2 Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario, Canada M5S1A8. 3 Department of Cell Biology, Medicine and Neurobiology, Duke University Medical Center, Durham, North Carolina 27710, USA. Correspondence and requests for materials should be addressed to S.R.J. (email: [email protected]). NATURE COMMUNICATIONS | 4:2720 | DOI: 10.1038/ncomms3720 | www.nature.com/naturecommunications 1 & 2013 Macmillan Publishers Limited.
    [Show full text]
  • Differentially Affect Monoamine Transporters and Abuse Liability
    Neuropsychopharmacology (2017) 42, 1950–1961 © 2017 American College of Neuropsychopharmacology. All rights reserved 0893-133X/17 www.neuropsychopharmacology.org N-Alkylated Analogs of 4-Methylamphetamine (4-MA) Differentially Affect Monoamine Transporters and Abuse Liability Ernesto Solis Jr1, John S Partilla2, Farhana Sakloth3, Iwona Ruchala4, Kathryn L Schwienteck5, 4 4 3 5 *,2 Louis J De Felice , Jose M Eltit , Richard A Glennon , S Stevens Negus and Michael H Baumann 1In Vivo Electrophysiology Unit, Behavioral Neuroscience Research Branch, Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, Baltimore, MD, USA; 2Designer Drug Research Unit, Intramural Research Program, National Institute on Drug Abuse, 3 National Institutes of Health, Baltimore, MD, USA; Department of Medicinal Chemistry, Virginia Commonwealth University, Richmond, VA, USA; 4 5 Department of Physiology and Biophysics, Virginia Commonwealth University, Richmond, VA, USA; Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, VA, USA Clandestine chemists synthesize novel stimulant drugs by exploiting structural templates known to target monoamine transporters for dopamine, norepinephrine, and serotonin (DAT, NET, and SERT, respectively). 4-Methylamphetamine (4-MA) is an emerging drug of – abuse that interacts with transporters, but limited structure activity data are available for its analogs. Here we employed uptake and release assays in rat brain synaptosomes, voltage-clamp current measurements in cells expressing transporters, and calcium flux assays in cells coexpressing transporters and calcium channels to study the effects of increasing N-alkyl chain length of 4-MA on interactions at DAT, NET, and SERT. In addition, we performed intracranial self-stimulation in rats to understand how the chemical modifications affect abuse liability.
    [Show full text]
  • Monoamine Reuptake Inhibitors in Parkinson's Disease
    Hindawi Publishing Corporation Parkinson’s Disease Volume 2015, Article ID 609428, 71 pages http://dx.doi.org/10.1155/2015/609428 Review Article Monoamine Reuptake Inhibitors in Parkinson’s Disease Philippe Huot,1,2,3 Susan H. Fox,1,2 and Jonathan M. Brotchie1 1 Toronto Western Research Institute, Toronto Western Hospital, University Health Network, 399 Bathurst Street, Toronto, ON, Canada M5T 2S8 2Division of Neurology, Movement Disorder Clinic, Toronto Western Hospital, University Health Network, University of Toronto, 399BathurstStreet,Toronto,ON,CanadaM5T2S8 3Department of Pharmacology and Division of Neurology, Faculty of Medicine, UniversitedeMontr´ eal´ and Centre Hospitalier de l’UniversitedeMontr´ eal,´ Montreal,´ QC, Canada Correspondence should be addressed to Jonathan M. Brotchie; [email protected] Received 19 September 2014; Accepted 26 December 2014 Academic Editor: Maral M. Mouradian Copyright © 2015 Philippe Huot et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The motor manifestations of Parkinson’s disease (PD) are secondary to a dopamine deficiency in the striatum. However, the degenerative process in PD is not limited to the dopaminergic system and also affects serotonergic and noradrenergic neurons. Because they can increase monoamine levels throughout the brain, monoamine reuptake inhibitors (MAUIs) represent potential therapeutic agents in PD. However, they are seldom used in clinical practice other than as antidepressants and wake-promoting agents. This review article summarises all of the available literature on use of 50 MAUIs in PD. The compounds are divided according to their relative potency for each of the monoamine transporters.
    [Show full text]
  • Narcolepsy: Current Treatment Options and Future Approaches
    REVIEW Narcolepsy: current treatment options and future approaches Michel Billiard Abstract: The management of narcolepsy is presently at a turning point. Three main avenues Department of Neurology, Gui de are considered in this review: 1) Two tendencies characterize the conventional treatment of Chauliac Hospital, Montpellier, France narcolepsy. Modafi nil has replaced methylphenidate and amphetamine as the fi rst-line treat- ment of excessive daytime sleepiness (EDS) and sleep attacks, based on randomized, double blind, placebo-controlled clinical trials of modafi nil, but on no direct comparison of modafi nil versus traditional stimulants. For cataplexy, sleep paralysis, and hypnagogic hallucinations, new antidepressants tend to replace tricyclic antidepressants and selective serotonin reuptake inhibitors (SSRIs) in spite of a lack of randomized, double blind, placebo-controlled clinical trials of these compounds; 2) The conventional treatment of narcolepsy is now challenged by sodium oxybate, the sodium salt of gammahydroxybutyrate, based on a series of randomized, double-blind, placebo-controlled clinical trials and a long-term open label study. This treatment has a fairly good effi cacy and is active on all symptoms of narcolepsy. Careful titration up to an adequate level is essential both to obtain positive results and avoid adverse effects; 3) A series of new treatments are currently being tested, either in animal models or in humans, They include novel stimulant and anticataplectic drugs, endocrine therapy, and, more attractively,
    [Show full text]
  • Antidepressant Potential of Nitrogen-Containing Heterocyclic Moieties: an Updated Review
    Review Article Antidepressant potential of nitrogen-containing heterocyclic moieties: An updated review Nadeem Siddiqui, Andalip, Sandhya Bawa, Ruhi Ali, Obaid Afzal, M. Jawaid Akhtar, Bishmillah Azad, Rajiv Kumar Department of ABSTRACT Pharmaceutical Chemistry, Depression is currently the fourth leading cause of disease or disability worldwide. Antidepressant is Faculty of Pharmacy, Jamia Hamdard approved for the treatment of major depression (including paediatric depression), obsessive-compulsive University, Hamdard disorder (in both adult and paediatric populations), bulimia nervosa, panic disorder and premenstrual Nagar, New Delhi - dysphoric disorder. Antidepressant is a psychiatric medication used to alleviate mood disorders, such as 110 062, India major depression and dysthymia and anxiety disorders such as social anxiety disorder. Many drugs produce an antidepressant effect, but restrictions on their use have caused controversy and off-label prescription a Address for correspondence: risk, despite claims of superior efficacy. Our current understanding of its pathogenesis is limited and existing Dr. Sandhya Bawa, E-mail: sandhyabawa761@ treatments are inadequate, providing relief to only a subset of people suffering from depression. Reviews of yahoo.com literature suggest that heterocyclic moieties and their derivatives has proven success in treating depression. Received : 08-02-11 Review completed : 15-02-11 Accepted : 17-02-11 KEY WORDS: Antidepressant, depression, heterocyclic epression is a chronic, recurring and potentially life- monoamine oxidase inhibitors (MAOIs, e.g. Nardil®) tricyclic D threatening illness that affects up to 20% of the population antidepressants (TCAs, e.g. Elavil). They increases the synaptic across the globe.[1] The etiology of the disease is suboptimal concentration of either two (5-HT and NE) or all three (5-HT, concentrations of the monoamine neurotransmitters serotonin NE and dopamine (DA)) neurotransmitters.
    [Show full text]
  • Roles for the Uptake 2 Transporter OCT3 in Regulation Of
    Marquette University e-Publications@Marquette Biomedical Sciences Faculty Research and Publications Biomedical Sciences, Department of 2-2019 Roles for the Uptake2 Transporter OCT3 in Regulation of Dopaminergic Neurotransmission and Behavior Paul J. Gasser Marquette University, [email protected] Follow this and additional works at: https://epublications.marquette.edu/biomedsci_fac Part of the Neurosciences Commons Recommended Citation Gasser, Paul J., "Roles for the Uptake2 Transporter OCT3 in Regulation of Dopaminergic Neurotransmission and Behavior" (2019). Biomedical Sciences Faculty Research and Publications. 191. https://epublications.marquette.edu/biomedsci_fac/191 Marquette University e-Publications@Marquette Biomedical Sciences Faculty Research and Publications/College of Health Sciences This paper is NOT THE PUBLISHED VERSION; but the author’s final, peer-reviewed manuscript. The published version may be accessed by following the link in the citation below. Neurochemistry International, Vol. 123, (February 2019): 46-49. DOI. This article is © Elsevier and permission has been granted for this version to appear in e-Publications@Marquette. Elsevier does not grant permission for this article to be further copied/distributed or hosted elsewhere without the express permission from Elsevier. Roles for the Uptake2 Transporter OCT3 in Regulation of Dopaminergic Neurotransmission and Behavior Paul J. Gasser Department of Biomedical Sciences, Marquette University, Milwaukee, WI Abstract Transporter-mediated uptake determines the
    [Show full text]
  • DOPAMINE TRANSPORTER in ALCOHOLISM a SPET Study
    DOPAMINE TRANSPORTER IN PEKKA ALCOHOLISM LAINE A SPET study Departments of Psychiatry and Clinical Chemistry, University of Oulu Department of Forensic Psychiatry, University of Kuopio Department of Clinical Physiology and Nuclear Medicine, University of Helsinki OULU 2001 PEKKA LAINE DOPAMINE TRANSPORTER IN ALCOHOLISM A SPET study Academic Dissertation to be presented with the assent of the Faculty of Medicine, University of Oulu, for public discussion in the Väinö Pääkkönen Hall of the Department of Psychiatry (Peltolantie 5), on November 30th, 2001, at 12 noon. OULUN YLIOPISTO, OULU 2001 Copyright © 2001 University of Oulu, 2001 Manuscript received 12 October 2001 Manuscript accepted 16 October 2001 Communicated by Professor Esa Korpi Professor Matti Virkkunen ISBN 951-42-6527-0 (URL: http://herkules.oulu.fi/isbn9514265270/) ALSO AVAILABLE IN PRINTED FORMAT ISBN 951-42-6526-2 ISSN 0355-3221 (URL: http://herkules.oulu.fi/issn03553221/) OULU UNIVERSITY PRESS OULU 2001 Laine, Pekka, Dopamine transporter in alcoholism A SPET study Department of Clinical Chemistry, Division of Nuclear Medicine, University of Oulu, P.O.Box 5000, FIN-90014 University of Oulu, Finland, Department of Forensic Psychiatry, University of Kuopio, , FIN-70211 University of Kuopio, Finland, Department of Clinical Physiology and Nuclear Medicine, Division of Nuclear Medicine, University of Helsinki, P.O. Box 340, FIN-00029 Helsinki, Finland, Department of Psychiatry, University of Oulu, P.O.Box 5000, FIN-90014 University of Oulu, Finland 2001 Oulu, Finland (Manuscript received 12 October 2001) Abstract A large body of animal studies indicates that reinforcement from alcohol is associated with dopaminergic neurotransmission in the mesocorticolimbic pathway. However, as most psychiatric phenomena cannot be studied with animals, human studies are needed.
    [Show full text]
  • Dopamine Uptake Through the Norepinephrine Transporter in Brain Regions with Low Levels of the Dopamine Transporter: Evidence from Knock-Out Mouse Lines
    The Journal of Neuroscience, January 15, 2002, 22(2):389–395 Dopamine Uptake through the Norepinephrine Transporter in Brain Regions with Low Levels of the Dopamine Transporter: Evidence from Knock-Out Mouse Lines Jose´ A. Moro´ n, Alicia Brockington, Roy A. Wise, Beatriz A. Rocha, and Bruce T. Hope Behavioral Neuroscience Branch, National Institute on Drug Abuse, National Institutes of Health, Baltimore, Maryland 21224 Selective blockers of the norepinephrine transporter (NET) in- 20% in caudate and nucleus accumbens synaptosomes from hibit dopamine uptake in the prefrontal cortex. This suggests wild-type and DAT knock-out mice but had no effect in those that dopamine in this region is normally cleared by the some- from NET knock-out mice. Cocaine failed to block dopamine what promiscuous NET. We have tested this hypothesis by uptake into caudate or nucleus accumbens synaptosomes comparing the effects of inhibitors selective for the three mono- from DAT knock-out mice. Cocaine and GBR12909 each inhib- amine transporters with those of a nonspecific inhibitor, co- ited dopamine uptake into caudate synaptosomes from NET caine, on uptake of 3H-dopamine into synaptosomes from knock-out mice, but cocaine effectiveness was reduced in the frontal cortex, caudate nucleus, and nucleus accumbens from case of nucleus accumbens synaptosomes. Thus, whereas wild-type, NET, and dopamine transporter (DAT) knock-out dopamine uptake in caudate and nucleus accumbens depends mice. Dopamine uptake was inhibited by cocaine and niso- primarily on the DAT, dopamine uptake in frontal cortex de- xetine, but not by GBR12909, in frontal cortex synaptosomes pends primarily on the NET.
    [Show full text]
  • Inhibition of Serotonin but Not Norepinephrine Transport During Development Produces Delayed, Persistent Perturbations of Emotional Behaviors in Mice
    The Journal of Neuroscience, January 2, 2008 • 28(1):199–207 • 199 Behavioral/Systems/Cognitive Inhibition of Serotonin But Not Norepinephrine Transport during Development Produces Delayed, Persistent Perturbations of Emotional Behaviors in Mice Mark S. Ansorge, Emanuela Morelli, and Jay A. Gingrich Sackler institute for Developmental Psychobiology, Division of Developmental Neuroscience, Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, New York 10032 Serotonin (5-HT) acts as a neurotransmitter, but also modulates brain maturation during early development. The demonstrated influ- ence of genetic variants on brain function, personality traits, and susceptibility to neuropsychiatric disorders suggests a critical impor- tance of developmental mechanisms. However, little is known about how and when developmentally perturbed 5-HT signaling affects circuitry and resulting behavior. The 5-HT transporter (5-HTT) is a key regulator of extracellular 5-HT levels and we used pharmacologic strategies to manipulate 5-HTT function during development and determine behavioral consequences. Transient exposure to the 5-HTT inhibitors fluoxetine, clomipramine, and citalopram from postnatal day 4 (P4) to P21 produced abnormal emotional behaviors in adult mice. Similar treatment with the norepinephrine transporter (NET) inhibitor, desipramine, did not adversely affect adult behavior, suggesting that 5-HT and norepinephrine (NE) do not share the same effects on brain development. Shifting our period of treatment/ testing
    [Show full text]
  • Effects of Opioids at Monoamine Transporters: a Potential for Interactions of Pain Medications with Antidepressants
    P.1.g.077 Effects of opioids at monoamine transporters: a potential for interactions of pain medications with antidepressants Anna Rickli1 and Matthias E Liechti1 1Division of Clinical Pharmacology & Toxicology, University Hospital Basel, University of Basel, Switzerland Introduction Opioid analgesics primarily act via activation of opioid receptors but some synthetic opioids may also inhibit the reuptake of monoamines. In particular the inhibition of the serotonin reuptake has been described to increase the risk for serotonergic toxicity (serotonin syndrome, fig 2), which may be fatal if untreated. Especially antidepressants inhibiting serotonin reuptake are often consumed together with pain medication, including over the counter cough medication containing dextromethorphan. Therefore this potential interaction needs careful attention. O OH O HO O O OH O HO O O O N O O HOHO HOHO O O N N N N N N N N N N N N HOHO Methadone Fentanyl TramadolTramadol O-Desmethyl-cis-tramadolO-Desmethyl-cis-tramadol DextromethorphanDextromethorphan PethidinePethidine MorphineMorphine Figure 1: Chemical structures of atypical synthetic opioids Study aim O O O O The aim of this in vitro study was to assess how potent clinically usedO synthetic opioidsO inhibitHOHOthe reuptake transporters for serotonin N N (SERT; 5-HT) and norepinephrine (NET; NE), in contrast to pure opioid-receptor agonists like morphine. We included the atypical N N N synthetic opioids tramadol, o-desmethyl-cis-tramadol,N dextromethorphan,N pethidine, methadoneN and its enantiomers, and fentanyl in this study. Methadone l(R)-Methadone d(S)-Methadone Tapentadol Methadone l(R)-Methadone d(S)-Methadone Tapentadol Methods We assessed 5-HT and NE reuptake inhibition in human embryonic kidney (HEK) 293 cells, stably expressing the respective human monoamine transporter [1, 2].
    [Show full text]
  • Characterization of Vesicular Monoamine Transporter 2 and Its Role in Parkinson's Disease Pathogenesis Using Drosophila Antonio Joel Tito Jr
    Texas Medical Center Library DigitalCommons@TMC UT GSBS Dissertations and Theses (Open Access) Graduate School of Biomedical Sciences 12-2016 Characterization of Vesicular Monoamine Transporter 2 and its role in Parkinson's Disease Pathogenesis using Drosophila Antonio Joel Tito Jr. Sheng Zhang Follow this and additional works at: http://digitalcommons.library.tmc.edu/utgsbs_dissertations Part of the Cell Biology Commons, Medicine and Health Sciences Commons, Molecular and Cellular Neuroscience Commons, Molecular Biology Commons, and the Molecular Genetics Commons Recommended Citation Tito, Antonio Joel Jr. and Zhang, Sheng, "Characterization of Vesicular Monoamine Transporter 2 and its role in Parkinson's Disease Pathogenesis using Drosophila" (2016). UT GSBS Dissertations and Theses (Open Access). 719. http://digitalcommons.library.tmc.edu/utgsbs_dissertations/719 This Dissertation (PhD) is brought to you for free and open access by the Graduate School of Biomedical Sciences at DigitalCommons@TMC. It has been accepted for inclusion in UT GSBS Dissertations and Theses (Open Access) by an authorized administrator of DigitalCommons@TMC. For more information, please contact [email protected]. CHARACTERIZATION OF VESICULAR MONOAMINE TRANSPORTER 2 AND ITS ROLE IN PARKINSON’S DISEASE PATHOGENESIS USING DROSOPHILA By Antonio Joel Tito Jr., M.S. APPROVED: _______________________ Sheng Zhang, Ph.D. _______________________ Hugo Bellen, Ph.D. _______________________ Richard Behringer, Ph.D. _______________________ Kartik Venkatachalam, Ph.D. _______________________ Momiao Xiong, Ph.D. _______________________ Nick Justice, Ph.D. _______________________ Andrew Bean, Ph.D. APPROVED: _______________________ Dean, UTHealth Graduate School of Biomedical Sciences at Houston CHARACTERIZATION OF VESICULAR MONOAMINE TRANSPORTER 2 AND ITS ROLE IN PARKINSON’S DISEASE PATHOGENESIS USING DROSOPHILA A DISSERTATION Presented to the Faculty of The University of Texas Health Science Center at Houston And The University of Texas M.D.
    [Show full text]
  • Structural Basis of Norepinephrine Recognition and Transport Inhibition
    ARTICLE https://doi.org/10.1038/s41467-021-22385-9 OPEN Structural basis of norepinephrine recognition and transport inhibition in neurotransmitter transporters ✉ Shabareesh Pidathala 1, Aditya Kumar Mallela1, Deepthi Joseph 1 & Aravind Penmatsa 1 Norepinephrine is a biogenic amine neurotransmitter that has widespread effects on alert- ness, arousal and pain sensation. Consequently, blockers of norepinephrine uptake have 1234567890():,; served as vital tools to treat depression and chronic pain. Here, we employ the Drosophila melanogaster dopamine transporter as a surrogate for the norepinephrine transporter and determine X-ray structures of the transporter in its substrate-free and norepinephrine-bound forms. We also report structures of the transporter in complex with inhibitors of chronic pain including duloxetine, milnacipran and a synthetic opioid, tramadol. When compared to dopamine, we observe that norepinephrine binds in a different pose, in the vicinity of subsite C within the primary binding site. Our experiments reveal that this region is the binding site for chronic pain inhibitors and a determinant for norepinephrine-specific reuptake inhibition, thereby providing a paradigm for the design of specific inhibitors for catecholamine neuro- transmitter transporters. ✉ 1 Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India. email: [email protected] NATURE COMMUNICATIONS | (2021) 12:2199 | https://doi.org/10.1038/s41467-021-22385-9 | www.nature.com/naturecommunications 1 ARTICLE NATURE COMMUNICATIONS | https://doi.org/10.1038/s41467-021-22385-9 eurotransmitter transporters of the solute carrier 6 (SLC6) substrates, including DA, DCP, and D-amphetamine, have pro- family enforce spatiotemporal control of neurotransmitter vided a glimpse into substrate recognition and consequent con- N + − 26 levels in the synaptic space through Na /Cl -coupled formational changes that occur in biogenic amine transporters .
    [Show full text]