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Psychostimulants

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https://www.readbyqxmd.com/read/28724279/alterations-in-striatal-circuits-underlying-addiction-like-behaviors
#1
REVIEW
Hyun Jin Kim, Joo Han Lee, Kyunghwa Yun, Joung-Hun Kim
Drug addiction is a severe psychiatric disorder characterized by the compulsive pursuit of drugs of abuse despite potential adverse consequences. Although several decades of studies have revealed that psychostimulant use can result in extensive alterations of neural circuits and physiology, no effective therapeutic strategies or medicines for drug addiction currently exist. Changes in neuronal connectivity and regulation occurring after repeated drug exposure contribute to addiction-like behaviors in animal models...
June 30, 2017: Molecules and Cells
https://www.readbyqxmd.com/read/28722021/activation-of-the-gabaergic-parafacial-zone-maintains-sleep-and-counteracts-the-wake-promoting-action-of-the-psychostimulants-armodafinil-and-caffeine
#2
C Anaclet, K Griffith, P M Fuller
We previously reported that acute and selective activation of GABA-releasing parafacial zone (PZ(Vgat)) neurons in behaving mice produces slow-wave-sleep (SWS), even in the absence of sleep deficit, suggesting that these neurons may represent, at least in part, a key cellular substrate underlying sleep drive. It remains however to be determined if PZ(Vgat) neurons actively maintain, as oppose to simply gate, SWS. To begin to experimentally address this knowledge gap, we asked whether activation of PZ(Vgat) neurons could attenuate or block the wake-promoting effects of two widely used wake-promoting psychostimulants, armodafinil or caffeine...
July 19, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28720013/the-5-ht1b-serotonin-receptor-regulates-methylphenidate-induced-gene-expression-in-the-striatum-differential-effects-on-immediate-early-genes
#3
David Alter, Joel A Beverley, Ronak Patel, Carlos A Bolaños-Guzmán, Heinz Steiner
Drug combinations that include a psychostimulant such as methylphenidate (Ritalin) and a selective serotonin reuptake inhibitor such as fluoxetine are indicated in several medical conditions. Co-exposure to these drugs also occurs with "cognitive enhancer" use by individuals treated with selective serotonin reuptake inhibitors. Methylphenidate, a dopamine reuptake inhibitor, by itself produces some addiction-related gene regulation in the striatum. We have demonstrated that co-administration of selective serotonin reuptake inhibitors potentiates these methylphenidate-induced molecular effects, thus producing a more "cocaine-like" profile...
July 1, 2017: Journal of Psychopharmacology
https://www.readbyqxmd.com/read/28715729/consistent-association-between-hypnotics-sedatives-and-non-traffic-injuries-results-from-a-national-household-survey
#4
María Del Mar Martín-Rodríguez, José Pulido, Eladio Jiménez-Mejías, Juan Hoyos, Pablo Lardelli-Claret, Gregorio Barrio
AIM: To quantify the relationship between patterns of psychostimulants, hypnotics/sedatives and alcohol consumption and the frequency of unintentional non-traffic injuries (UNTIs) requiring medical assistant in Spain. METHODS: We carried out a cross sectional study using a randomized pooled sample from two household surveys on psychoactive drugs use (n=51,649 subjects aged 15-64 years). We estimated the magnitude of the association between the use of psychostimulants and hypnotics/sedatives in the last 12 months as well as alcohol consumption in the last 30days with the occurrence of UNTIs in the last 12 months (falls, knocks/bumps and cuts) by building several logistic regression models, which took into account the effect of sociodemographic characteristics and the use of other psychoactive drugs (including cannabis)...
July 14, 2017: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/28714720/the-behavioral-effects-of-chronic-sugar-and-or-caffeine-consumption-in-adult-and-adolescent-rats
#5
Jane L Franklin, Travis A Wearne, Judi Homewood, Jennifer L Cornish
Caffeine is a psychostimulant frequently consumed by adults and children, often in combination with high levels of sugar. Chronic pretreatment with either substance can amplify both amphetamine and cocaine-induced hyperactivity in rodents. The present study sought to elucidate whether age at the time of exposure to sugar and/or caffeine alters sensitivity to an acute illicit psychostimulant (methamphetamine, [METH]) challenge in adulthood. Adult and adolescent (Postnatal Day 35 on first day of treatment) male Sprague-Dawley rats were treated for 26 days with water, caffeine (0...
August 2017: Behavioral Neuroscience
https://www.readbyqxmd.com/read/28710651/intoxication-caused-by-new-psychostimulants-analytical-methods-to-disclose-acute-and-chronic-use-of-benzofurans-and-ethylphenidate
#6
Bernardino Barceló, Isabel Gomila, Maria Concetta Rotolo, Emilia Marchei, Chrystalla Kyriakou, Simona Pichini, Carolina Roset, Miguel Ángel Elorza, Francesco Paolo Busardò
The acute and chronic toxicity of several new psychoactive substances (NPS) is unknown, and only little information is available on the pharmacology and toxicology, toxicokinetics, and detectability in body samples of such new compounds. We here propose analytical methods to disclose acute and chronic use of two types of new psychostimulants: benzofurans and ethylphenidate and we applied them to a real case of a subject attending Emergency Department with signs of acute intoxication due to psychotropic drug(s)...
July 15, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28710520/psychostimulants-and-forced-swim-stress-interaction-how-activation-of-the-hypothalamic-pituitary-adrenal-axis-and-stress-induced-hyperglycemia-are-affected
#7
Humberto Gagliano, Juan Antonio Ortega-Sanchez, Roser Nadal, Antonio Armario
RATIONALE: We recently reported that simultaneous exposure to amphetamine and various stressors resulted in reduced hypothalamic-pituitary-adrenal (HPA) and glycemic responses to the stressors. Since this is a new and relevant phenomenon, we wanted to further explore this interaction. OBJECTIVES: This study aims (i) to characterize the effect of various doses of amphetamine on the physiological response to a predominantly emotional stressor (forced swim) when the drug was given immediately before stress; (ii) to study if an interaction appears when the drug was given 30 min or 7 days before swim; and (iii) to know whether cocaine causes similar effects when given just before stress...
July 14, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28704276/effects-of-d1-and-d2-receptor-antagonists-on-the-discriminative-stimulus-effects-of-methylendioxypyrovalerone-and-mephedrone-in-male-sprague-dawley-rats-trained-to-discriminate-d-amphetamine
#8
Eric L Harvey, Rachel L Burroughs, Lisa E Baker
Psychopharmacology research has amassed substantial evidence for similarities between synthetic cathinones and other commonly abused psychostimulants. Few studies have utilized drug discrimination methods to investigate synthetic cathinones, and the precise neurochemical substrates underlying their interoceptive effects have not been examined. The present study assessed the involvement of D1 and D2 dopaminergic receptors in the stimulus effects of 3,4-methylenedioxypyrovalerone (MDPV) and mephedrone (MEPH) in rats trained to discriminate D-amphetamine...
July 12, 2017: Behavioural Pharmacology
https://www.readbyqxmd.com/read/28700108/gpr88-in-a2a-receptor-expressing-neurons-modulates-locomotor-response-to-dopamine-agonists-but-not-sensorimotor-gating
#9
A C Meirsman, A de Kerchove d'Exaerde, B L Kieffer, A M Ouagazzal
The orphan receptor, GPR88, is emerging as a key player in the pathophysiology of several neuropsychiatric diseases, including psychotic disorders. Knockout (KO) mice lacking GPR88 throughout the brain exhibit many abnormalities relevant to schizophrenia including locomotor hyperactivity, behavioral hypersensitivity to dopaminergic psychostimulants and deficient sensorimotor gating. Here, we used conditional knockout (cKO) mice lacking GPR88 selectively in striatal medium spiny neurons expressing A2A receptor to determine neuronal circuits underlying these phenotypes...
July 12, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28694772/connexin-dependent-neuroglial-networking-as-a-new-therapeutic-target
#10
REVIEW
Mathieu Charvériat, Christian C Naus, Luc Leybaert, Juan C Sáez, Christian Giaume
Astrocytes and neurons dynamically interact during physiological processes, and it is now widely accepted that they are both organized in plastic and tightly regulated networks. Astrocytes are connected through connexin-based gap junction channels, with brain region specificities, and those networks modulate neuronal activities, such as those involved in sleep-wake cycle, cognitive, or sensory functions. Additionally, astrocyte domains have been involved in neurogenesis and neuronal differentiation during development; they participate in the "tripartite synapse" with both pre-synaptic and post-synaptic neurons by tuning down or up neuronal activities through the control of neuronal synaptic strength...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28694157/how-methamphetamine-exposure-during-different-neurodevelopmental-stages-affects-social-behavior-of-adult-rats
#11
Hrebíčková Ivana, Ševčíková Mária, Macúchová Eva, Šlamberová Romana
Social behavior involves complex of different forms of interactions between individuals that is essential for healthy mental and physical development throughout lifespan. Psychostimulants, including methamphetamine (MA), have neurotoxic effect, especially, if they are targeting CNS during its critical periods of development. The present study was aimed on evaluation of changes in social interactions (SI) following scheduled prenatal/neonatal MA treatment in combination with acute application in adulthood. Eight groups of male and eight groups of female rats were tested in adulthood: rats, whose mothers were exposed to MA (5mg/ml/kg) or saline (SA, 1ml/kg) during the first half of gestation (ED 1-11), the second half of gestation (ED 12-22) and neonatal period (PD 1-11)...
July 7, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28690202/the-impact-of-methylphenidate-and-its-enantiomers-on-dopamine-synthesis-and-metabolism-in-vitro
#12
Jasmin Bartl, Ferruccio Palazzesi, Michele Parrinello, Leif Hommers, Peter Riederer, Susanne Walitza, Edna Grünblatt
Methylphenidate (MPH), a psychostimulant, is an effective first-line treatment for the symptoms associated with Attention-Deficit/Hyperactivity Disorder (ADHD). Although most MPH formulations are composed of the racemic 1:1 mixture of the two enantiomers (d- and l-threo), converging lines of evidence indicate that d-threo MPH seems to be superior to the l-isomer. We aimed to investigate whether MPH racemic mixture or pure enantiomers influence the enzyme activity of tyrosine hydroxylase (TH), monoamine oxidase B (MAO-B), catechol-O-methyltransferase (COMT), and aldehyde dehydrogenase (ALDH) in vitro in homogenates of rat PC12 cells incubated with racemic, d- and l-threo MPH (1nM up to 100μM), or a vehicle for control...
July 8, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28686721/systemic-pd149163-a-neurotensin-receptor-1-agonist-decreases-methamphetamine-self-administration-in-dba-2j-mice-without-causing-excessive-sedation
#13
Amanda L Sharpe, Erika Varela, Michael J Beckstead
Methamphetamine (METH) is a psychostimulant that exhibits significant abuse potential. Although METH addiction is a major health and societal concern, no drug is currently approved for its therapeutic management. METH activates the central dopaminergic "reward" circuitry, and with repeated use increases levels of the neuromodulatory peptide neurotensin in the nucleus accumbens and ventral tegmental area. Previous studies in rats suggest that neurotensin agonism decreases METH self-administration, but these studies did not examine the effect of neurotensin agonism on the pattern of self-administration or open field locomotion...
2017: PloS One
https://www.readbyqxmd.com/read/28682529/risk-of-irritability-with-psychostimulant-treatment-in-children-with-adhd-a-meta-analysis
#14
Zachary D Stuckelman, Jilian M Mulqueen, Eduardo Ferracioli-Oda, Stephanie C Cohen, Catherine G Coughlin, James F Leckman, Michael H Bloch
OBJECTIVE: Irritability is listed as a common side effect of psychostimulant medications. However, psychostimulants have been demonstrated as an effective treatment in reducing irritability and aggression in children with attention-deficit/hyperactivity disorder (ADHD). The goal of this study was to quantify the risk of irritability as a side effect of psychostimulant treatment for ADHD. DATA SOURCES AND STUDY SELECTION: A PubMed search was conducted on August 18, 2013, to identify all double-blind, randomized, placebo-controlled trials published in English examining the efficacy of psychostimulant medications in the treatment of children with ADHD...
June 2017: Journal of Clinical Psychiatry
https://www.readbyqxmd.com/read/28682218/differences-in-the-rates-of-drug-polyconsumption-and-psychiatric-comorbidity-among-patients-with-cocaine-use-disorders-according-to-the-mental-health-service
#15
P Araos, Esperanza Vergara-Moragues, Francisco González-Saiz, María Pedraz, Nuria García-Marchena, Pablo Romero-Sanchiz, Juan Jesus Ruiz, Rafael Campos-Cloute, Antonia Serrano, Francisco Javier Pavón, Marta Torrens, Fernando Rodriguez De Fonseca
Cocaine continues to be a worldwide public health concern in Europe. To improve prognosis and intervention, it is necessary to understand the characteristics of the patients who depend on the services where they receive care. The objective is to analyze the differences among patients who use cocaine and between ambulatory and residential resources to better adapt treatment. This is a descriptive, observational study of two populations of cocaine users in treatment: the ambulatory therapeutic community (ATC) and the therapeutic community (TC)...
July 6, 2017: Journal of Psychoactive Drugs
https://www.readbyqxmd.com/read/28677506/mephedrone-concentrations-in-cases-of-clinical-intoxication
#16
Esther Papaseit, Eulàlia Olesti, Rafael de la Torre, Marta Torrens, Magí Farré
Background Mephedrone (4-methylmethcathinone, 4-MMC), a ring-substituted synthetic cathinone derivative has become established as a permanent illicit drug in the dynamic new psychoactive substances (NPS) scene. Objective This review summarizes current knowledge on mephedrone concentrations in biological samples from cases of acute intoxications (fatal and non-fatal), pharmacokinetics studies, wastewater and anonymous pooled urine analysis in order to provide an overview of the reliable scientific knowledge on toxicokinetics of mephedrone in humans...
July 4, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28665917/brief-psychosis-induced-by-methylphenidate-in-a-child-with-attention-deficit-disorder-a-case-report-and-literature-review
#17
Juan Carlos Martínez-Aguayo, Marcelo Arancibia, Nicolás Meza-Concha, Camila Bustamante, Javier Pérez-Bracchiglione, Eva Madrid
Methylphenidate-induced psychosis has been scarcely studied due to bioethical and neurobiological issues regarding its research. Although some authors have hypothesized that there might be a vulnerability for the development of a major psychiatric disorder in the long term, there is no agreement about the predictive value of this type of psychosis in children and adolescents, and its origin is also uncertain. It has been suggested that higher dopamine levels in some cerebral regions and a family history of mental disorders might increase the risk of psychosis secondary to psychostimulants...
June 21, 2017: Medwave
https://www.readbyqxmd.com/read/28664541/placebo-response-and-its-determinants-in-children-with-adhd-across-multiple-observers-and-settings-a-randomized-clinical-trial
#18
Weam Fageera, Alexandru Traicu, Sarojini M Sengupta, Marie-Eve Fortier, Zia Choudhry, Aurélie Labbe, Natalie Grizenko, Ridha Joober
This study aims to quantify placebo response (PR) in children with attention deficit hyperactivity disorder (ADHD) as assessed by parents and teachers and to explore some of its determinants. Five hundred and forty children with ADHD (ages 6-12) were recruited to a randomized, double-blind, placebo-controlled crossover trial with methylphenidate. The main outcome variable was Conners' Global Index (CGI), based on assessment of behaviour by parents (CGI-P) and teacher (CGI-T). PR was calculated as the difference between CGI-P/T scores at baseline and placebo week...
June 30, 2017: International Journal of Methods in Psychiatric Research
https://www.readbyqxmd.com/read/28661099/self-administration-of-methamphetamine-alters-gut-biomarkers-of-toxicity
#19
Amanda Flack, Amanda L Persons, Sharanya M Kousik, T Celeste Napier, Anna Moszczynska
Methamphetamine (METH) is a highly abused psychostimulant that is associated with an increased risk for developing Parkinson's disease (PD). This enhanced vulnerability likely relates to the toxic effects of METH that overlap with PD pathology, e.g., aberrant functioning of α-synuclein and parkin. In PD, peripheral factors are thought to contribute to central nervous system (CNS) degeneration. For example, α-synuclein levels in the enteric nervous system (ENS) are elevated, and this precedes the onset of motor symptoms...
June 29, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28656354/nonfatal-and-fatal-intoxications-with-pure-caffeine-report-of-three-different-cases
#20
Jan Magdalan, Marcin Zawadzki, Rafał Skowronek, Magdalena Czuba, Barbara Porębska, Tomasz Sozański, Paweł Szpot
Caffeine is not usually perceived as a drug by most people because it is found in many foods and drinks, including caffeinated energy drinks, as well as in over the counter analgesics and cold preparations. Recently in Poland it has become increasingly common to take pure caffeine, bought through online stores, as a psychoanaleptic. This creates a much higher risk of severe and even fatal poisoning in comparison with the risk associated with the abuse of food products and non-prescription medicines containing low doses of caffeine...
June 27, 2017: Forensic Science, Medicine, and Pathology
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