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International Journal of Neuropsychopharmacology

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https://www.readbyqxmd.com/read/28637184/a-preliminary-naturalistic-study-of-low-dose-ketamine-for-depression-and-suicide-ideation-in-the-emergency-department
#1
Gregory Luke Larkin, Annette L Beautrais
No abstract text is available yet for this article.
June 20, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28637246/effect-of-psilocybin-on-empathy-and-moral-decision-making
#2
Thomas Pokorny, Katrin H Preller, Michael Kometer, Isabel Dziobek, Franz X Vollenweider
Background: Impaired empathic abilities lead to severe negative social consequences and influence the development and treatment of several psychiatric disorders. Furthermore, empathy has been shown to play a crucial role in moral and prosocial behaviour. Although the serotonin (5-HT) system has been implicated in modulating empathy and moral behaviour, the relative contribution of the various 5-HT receptor subtypes is still unknown. Methods: We investigated the acute effect of psilocybin (0...
June 16, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28633291/p2x7-receptors-drive-spine-synapse-plasticity-in-the-learned-helplessness-model-of-depression
#3
L Otrokocsi, Á Kittel, B Sperlágh
Background: Major depressive disorder is characterized by structural and functional abnormalities of cortical and limbic brain areas, including a decrease in spine synapse number in the dentate gyrus (DG) of the hippocampus. Recent studies highlighted that both genetic and pharmacological invalidation of the purinergic P2X7 receptor (P2rx7) leads to antidepressant-like phenotype in animal experiments, however, the impact of P2rx7 on depression-related structural changes in the hippocampus is not clarified yet...
June 13, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28605494/glutamate-transport-a-new-bench-to-bedside-mechanism-for-treating-drug-abuse
#4
Sade Spencer, Peter W Kalivas
Drug addiction has often been described as a "hijacking" of the brain circuits involved in learning and memory. Glutamate is the principal excitatory neurotransmitter in the brain, and its contribution to synaptic plasticity and learning processes is well established in animal models. Likewise, over the past twenty years the addiction field has ascribed a critical role for glutamatergic transmission in the development of addiction. Chronic drug use produces enduring neuroadaptations in corticostriatal projections that are believed to contribute to a maladaptive deficit in inhibitory control over behavior...
June 12, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28591782/sex-dependent-effects-of-stress-on-immobility-behavior-and-vta-dopamine-neuron-activity-modulation-by-ketamine
#5
Millie Rincón-Cortés, Anthony A Grace
Background: Stress constitutes a risk factor across several psychiatric disorders. Moreover, females are more susceptible to stress-related disorders, such as depression, than males. Although dopamine (DA) system underactivation is implicated in the pathophysiology of depression, little is known about the female DA system at baseline and post-stress. Methods: The effects of chronic mild stress (CMS) were examined on ventral tegmental area (VTA) DA neuron activity and forced swim test (FST) immobility by comparing male and female rats...
June 7, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28582570/phase-ii-proof-of-concept-trial-of-the-orexin-receptor-antagonist-filorexant-mk-6096-in-patients-with-major-depressive-disorder
#6
Kathryn M Connor, Paulette Ceesay, Jill Hutzlemann, Duane Snavely, Andrew D Krystal, Madhukar H Trivedi, Michael Thase, Christopher Lines, W Joseph Herring, David Michelson
Background: We evaluated the orexin receptor antagonist filorexant (MK-6096) for treatment augmentation in patients with major depressive disorder (MDD). Methods: Six-week, double-blind, placebo-controlled, parallel-group, Phase II, proof-of-concept study. Patients with MDD (partial responders to ongoing antidepressant therapy) were randomized 1:1 to once-daily oral filorexant 10mg or matching placebo. Results: Due to enrollment challenges the study was terminated early, resulting in insufficient statistical power to detect a pre-specified treatment difference; of 326 patients planned, 129 (40%) were randomized and 128 took treatment...
June 3, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28582529/disrupted-olfactory-integration-in-schizophrenia-functional-connectivity-study
#7
Sara Kiparizoska, Toshikazu Ikuta
Background: Evidence for olfactory dysfunction in schizophrenia has been firmly established. However, in the typical understanding of schizophrenia, olfaction is not recognized to contribute to or interact with the illness. Despite the solid presence of olfactory dysfunction in schizophrenia, its relation to the rest of the illness remains largely unclear. Here, we aimed to examine functional connectivity of the olfactory bulb, olfactory tract, and piriform cortices and isolate the network that would account for the altered olfaction in schizophrenia...
June 3, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28582515/decreased-prostaglandin-d2-levels-in-major-depressive-disorder-are-associated-with-depression-like-behaviors
#8
Cuilin Chu, Hui Wei, Wanwan Zhu, Yan Shen, Qi Xu
Background: Prostaglandin (PG) D2 is the most abundant prostaglandin in the mammalian brain. The physiological and pharmacological actions of PGD2 in the central nervous system seem to be associated with some of the symptoms exhibited by patients with major depressive disorder (MDD). Previous studies have found that PGD2 synthase was decreased in the cerebrospinal fluid of MDD patients. We speculated that there may be a dysregulation of PGD2 levels in MDD. Methods: Ultra-performance liquid chromatography-tandem mass spectrometry coupled with a stable isotopic labeled internal standard was used to determine PGD2 levels in the plasma of MDD patients and in the brains of depressive mice...
June 3, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28575455/adolescent-alcohol-exposure-induced-changes-in-alpha-melanocyte-stimulating-hormone-and-neuropeptide-y-pathways-via-histone-acetylation-in-the-brain-during-adulthood
#9
Dadasaheb M Kokare, Evan J Kyzar, Huaibo Zhang, Amul J Sakharkar, Subhash C Pandey
Background: Adolescent intermittent ethanol (AIE) exposure causes long-lasting alterations in brain epigenetic mechanisms. Melanocortin and neuropeptide Y (NPY) signaling interact and are affected by ethanol exposure in the brain. Here, the persistent effects of AIE on alpha-melanocyte stimulating hormone (α-MSH), melanocortin 4 receptor (MC4R) and NPY expression and their regulation by histone acetylation mechanisms were investigated in adulthood. Methods: Male rats were exposed to AIE (2 g/kg, i...
May 31, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28531297/mechanisms-of-kappa-opioid-receptor-potentiation-of-dopamine-d2-receptor-function-in-quinpirole-induced-locomotor-sensitization-in-rats
#10
Angélica P Escobar, Marcela P González, Rodrigo C Meza, Verónica Noches, Pablo Henny, Katia Gysling, Rodrigo A España, José A Fuentealba, María E Andrés
Background: Increased locomotor activity in response to the same stimulus is an index of behavioral sensitization observed in preclinical models of drug addiction and compulsive behaviors. Repeated administration of Quinpirole (QNP), a D2/D3 dopamine agonist, induces locomotor sensitization. This effect is potentiated and accelerated by co-administration of U69593, a kappa opioid receptor agonist (KOR). The mechanism underlying KOR potentiation of QNP-induced locomotor sensitization remains to be elucidated...
May 22, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28531264/cariprazine-exhibits-anxiolytic-and-dopamine-d3-receptor-dependent-antidepressant-effects-in-the-chronic-stress-model
#11
Vanya Duric, Mounira Banasr, Tina Franklin, Ashley Lepack, Nika Adham, Béla Kiss, István Gyertyán, Ronald S Duman
Background: Cariprazine, a D3-preferring dopamine D2/D3 receptor partial agonist, is a new antipsychotic drug recently approved in the US for the treatment of schizophrenia and bipolar mania. We recently demonstrated that cariprazine also has significant anti-anhedonic-like effects in rats subjected to chronic stress; however, the exact mechanism of action for cariprazine's antidepressant-like properties is not known. Thus, in this study we examined whether the effects of cariprazine are mediated by dopamine D3 receptors...
May 22, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28525587/assessing-the-psychedelic-after-glow-in-ayahuasca-users-post-acute-neurometabolic-and-functional-connectivity-changes-are-associated-with-enhanced-mindfulness-capacities
#12
Frederic Sampedro, Mario de la Fuente Revenga, Marta Valle, Natalia Roberto, Elisabet Domínguez-Clavé, Matilde Elices, Luís Eduardo Luna, José Alexandre S Crippa, Jaime E C Hallak, Draulio B de Araujo, Pablo Friedlander, Steven A Barker, Enrique Álvarez, Joaquim Soler, Juan C Pascual, Amanda Feilding, Jordi Riba
Background: Ayahuasca is a plant tea containing the psychedelic 5-HT2A agonist N,N-dimethyltryptamine (DMT) and harmala monoamine-oxidase inhibitors. Acute administration leads to neurophysiological modifications in brain regions of the default mode network (DMN), purportedly through a glutamatergic mechanism. Post-acutely, ayahuasca potentiates mindfulness capacities in volunteers, and induces rapid and sustained antidepressant effects in treatment-resistant patients. However, the mechanisms underlying these fast and maintained effects are poorly understood...
May 19, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28525569/comparative-effects-of-methylphenidate-modafinil-and-mdma-on-response-inhibition-neural-networks-in-healthy-subjects
#13
André Schmidt, Felix Müller, Patrick C Dolder, Yasmin Schmid, Davide Zanchi, Matthias E Liechti, Stefan Borgwardt
Background: Psychostimulants such as methylphenidate (MPH) and modafinil are increasingly used by healthy people for cognitive enhancement purposes, whereas the acute effect of 3,4-methylenedioxymethamphetamine (MDMA, ecstasy) on cognitive functioning in healthy subjects remains unclear. This study directly compared the acute effects of MPH, modafinil and MDMA on the neural mechanisms underlying response inhibition in healthy subjects. Methods: Using a double-blind within-subject placebo-controlled cross-over design, MPH, modafinil and MDMA were administrated to 21 healthy subjects, while performing a Go/No-Go event-related functional magnetic resonance imaging task to assess brain activation during motor response inhibition...
May 19, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28520926/investigation-of-mir-1202-mir-135a-and-mir-16-in-major-depressive-disorder-and-antidepressant-response
#14
Laura M Fiori, Juan Pablo Lopez, Stephane Richard-Devantoy, Marcelo Berlim, Eduardo Chachamovich, Fabrice Jollant, Jane Foster, Susan Rotzinger, Sidney Kennedy, Gustavo Turecki
Background: Major depressive disorder is a debilitating illness, which is most commonly treated with antidepressant drugs. As the majority of patients do not respond on their first trial, there is great interest in identifying biological factors which indicate the most appropriate treatment for each patient. Studies suggest that microRNA represent excellent biomarkers to predict antidepressant response. Methods: We investigated the expression of miR-1202, miR-135a, and miR-16 in peripheral blood from two cohorts of depressed patients who received eight weeks of antidepressant therapy...
May 16, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28498954/cognitive-impairment-in-bipolar-disorder-treatment-and-prevention-strategies
#15
Brisa Sole, Esther Jimenez, Carla Torrent, Maria Reinares, Caterina Del Mar Bonnin, Imma Torres, Cristina Varo, Iria Grande, Elia Valls, Estela Salagre, Jose Sanchez-Moreno, Anabel Martinez-Aran, André F Carvalho, Eduard Vieta
Over the last decade there has been a growing appreciation of the importance of identifying and treating cognitive impairment associated with bipolar disorder (BD) since it persists in remission periods. Evidence indicates that neurocognitive dysfunction may significantly influence patients' psychosocial outcomes. An ever increasing body of research seeks to achieve a better understanding of potential moderators contributing to cognitive impairment in BD in order to develop prevention strategies and effective treatments...
May 11, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28482015/a-new-paradigm-for-evaluating-avoidance-escape-motivation
#16
Iku Tsutsui-Kimura, Youcef Bouchekioua, Masaru Mimura, Kenji F Tanaka
Backgrounds: Organisms have evolved to approach pleasurable opportunities and to avoid or escape from aversive experiences. These two distinct motivations are referred to as approach and avoidance/escape motivations and are both considered vital for survival. Despite several recent advances in understanding the neurobiology of motivation, most studies addressed approach but not avoidance/escape motivation. Here we develop a new experimental paradigm to quantify avoidance/escape motivation and examine the pharmacological validity...
May 6, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28482013/hydrogen-sulfide-inhibits-chronic-unpredictable-mild-stress-induced-depressive-like-behavior-by-upregulation-of-sirt-1-involvement-in-suppression-of-hippocampal-endoplasmic-reticulum-stress
#17
Shu-Yun Liu, Dan Li, Hai-Ying Zeng, Li-Yuan Kan, Wei Zou, Ping Zhang, Hong-Feng Gu, Xiao-Qing Tang
Background: Hydrogen sulfide (H2S) is a crucial signaling molecule with a wide range of physiological functions. Previously, we have confirmed that stress-induced depression is accompanied with disturbance of H2S generation in hippocampus. The present work attempted to investigate the inhibitory effect of H2S on chronic unpredictable mild stress (CUMS)-induced depressive-like behaviors and the underlying mechanism. Methods: We established the rat model of CUMS to simulate depression...
May 6, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28453642/facilitation-of-contextual-fear-extinction-by-orexin-1-receptor-antagonism-is-associated-with-the-activation-of-specific-amygdala-cell-subpopulations
#18
África Flores, Cyril Herry, Rafael Maldonado, Fernando Berrendero
Background: Orexins are hypothalamic neuropeptides recently involved in the regulation of emotional memory. The basolateral amygdala (BLA), an area orchestrating fear memory processes, appears to be modulated by orexin transmission during fear extinction. However, the neuronal types within the BLA involved in this modulation remain to be elucidated. Methods: We used retrograde tracing combined with immunofluorescence techniques in mice to identify BLA projection neurons and cell subpopulations in this brain region influenced by orexin transmission during contextual fear extinction consolidation...
April 27, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28444326/preclinical-evidence-that-5-ht1b-receptor-agonists-show-promise-as-medications-for-psychostimulant-use-disorders
#19
Raul Garcia, Austin R Cotter, Kenneth Leslie, M Foster Olive, Janet L Neisewander
Background: 5-HT1B receptor (5-HT1BR) agonists enhance cocaine intake during daily self-administration sessions, but decrease cocaine intake when tested after prolonged abstinence. We examined if 5-HT1BR agonists produce similar abstinence-dependent effects on methamphetamine intake. Methods: Male rats were trained to self-administer methamphetamine (0.1 mg/kg, IV) on low (FR5 and VR5) and high (progressive ratio; PR) effort schedules of reinforcement until intake was stable...
April 22, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28444246/lateral-orbitofrontal-cortical-modulation-on-medial-prefrontal-cortex-amygdala-pathway-differential-regulation-of-intra-amygdala-gabaa-and-gabab-receptors
#20
Chun-Hui Chang
Background: The basolateral complex of the amygdala receives inputs from neocortical areas, including the medial prefrontal cortex (mPFC) and lateral orbitofrontal cortex (lOFC). Earlier studies have shown that lOFC activation exerts an inhibitory gating on mPFC-amygdala information flow. Here we examined the individual role of GABAA and GABAB receptors in this process. Methods: In vivo extracellular single-unit recordings were done in anesthetized rats. We searched amygdala neurons that fire in response to mPFC activation, tested lOFC gating at different delays (lOFC-mPFC delays: 25, 50, 100, 250, 500, and 1000 ms), and examined differential contribution of GABAA and GABAB receptors with iontophoresis...
April 22, 2017: International Journal of Neuropsychopharmacology
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