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https://www.readbyqxmd.com/read/28926161/neural-basis-of-major-depression-beyond-monoamine-hypothesis
#1
Shuken Boku, Shin Nakagawa, Hiroyuki Toda, Akitoyo Hishimoto
Monoamine hypothesis has been accepted as the most common hypothesis of major depression for a long period because of its simplicity and understandability. Actually, most of currently used antidepressants have been considered to act based on monoamine hypothesis. However, it has been pointed out as an important problem of monoamine hypothesis that it is unable to explain the latency of response to antidepressants. In addition, a large number of patients with major depression has been refractory to currently used antidepressants yet...
September 19, 2017: Psychiatry and Clinical Neurosciences
https://www.readbyqxmd.com/read/28925998/a-critical-period-for-antidepressant-induced-acceleration-of-neuronal-maturation-in-adult-dentate-gyrus
#2
I Åmellem, S Suresh, C C Chang, S S L Tok, A Tashiro
Selective serotonin reuptake inhibitors (SSRIs) are the most commonly used medications for mood and anxiety disorders, and adult neurogenesis in the dentate gyrus has been shown to be involved in the behavioral effects of SSRIs in mice. Studies have shown the varied effects of chronic treatment with SSRIs on adult neurogenesis. One such effect is the acceleration of neuronal maturation, which affects the functional integration of new neurons into existing neuronal circuitry. In this study, we labeled new neurons by using GFP-expressing retroviral vectors in mice and investigated the effect of an SSRI, fluoxetine, on these neurons at different time points after neuronal birth...
September 19, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28925030/drug-repurposing-may-generate-novel-approaches-to-treating-depression
#3
REVIEW
Mohamed Elsaed Ebada
OBJECTIVES: The breakthrough advancements in scientific medical research have greatly improved our understanding of the pathogenesis of depression, encouraging drug discoverers to take a shorter path than ever through drug repurposing to generate new antidepressant medications. In addition to reduced noradrenergic and serotonergic neurotransmission in the brain, other coincidence features such as glutamate neurotoxicity, inflammation and/or cerebrovascular insufficiency are implicated in the pathogenesis of major depressive disorder and late-life depression...
September 18, 2017: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/28920927/no-impact-of-preadmission-anti-inflammatory-drug-use-on-risk-of-depression-and-anxiety-after-critical-illness
#4
Clara R Medici, Jaimie L Gradus, Lars Pedersen, Henrik T Sørensen, Søren D Østergaard, Christian F Christiansen
OBJECTIVES: Risk of depression and anxiety is elevated after intensive care. Drugs with anti-inflammatory properties may have antidepressant and anxiolytic effects. The aim of this study was to investigate the association between preadmission use of drugs with anti-inflammatory effects and risk of new-onset depression and anxiety among adult patients admitted to an ICU. DESIGN: Propensity score-matched, population-based cohort study. SETTING: All ICUs in Denmark from 2005 to 2013...
October 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28916557/study-of-fall-risk-increasing-drugs-in-elderly-patients-before-and-after-a-bone-fracture
#5
Mónica Beunza-Sola, Ángel M Hidalgo-Ovejero, Jon Martí-Ayerdi, José Germán Sánchez-Hernández, Miguel Menéndez-García, Serafín García-Mata
BACKGROUND: Accidental falls have a significant economic and human impact. The use of certain drugs is one of the modifiable risk factors associated with these events. OBJECTIVE: The aim of this study was to determine the prevalence of use and to explore changes in treatment with fall-related drugs in patients over 65 years of age admitted as a result of a fall-related fracture. METHODS: Observational and prospective study performed in a tertiary level hospital...
September 15, 2017: Postgraduate Medical Journal
https://www.readbyqxmd.com/read/28916441/monoamine-involvement-in-the-antidepressant-like-effect-induced-by-p2-blockade
#6
Cassiano Raf Diniz, Murilo Rodrigues, Plínio C Casarotto, Vítor S Pereira, Carlos C Crestani, Sâmia Rl Joca
Depression is a common mental disorder that affects millions of individuals worldwide. Available monoaminergic antidepressants are far from ideal since they show delayed onset of action and are ineffective in approximately 40% of patients, thus indicating the need of new and more effective drugs. ATP signaling through P2 receptors seems to play an important role in neurophatological mechanisms involved in depression, since their pharmacological or genetic inactivation induce antidepressant-like effects in the forced swimming test (FST)...
September 12, 2017: Brain Research
https://www.readbyqxmd.com/read/28914277/antidepressant-use-and-depressive-symptoms-in-intensive-care-unit-survivors
#7
Sophia Wang, Chris Mosher, Sujuan Gao, Kayla Kirk, Sue Lasiter, Sikander Khan, You Na Kheir, Malaz Boustani, Babar Khan
Nearly 30% of intensive care unit (ICU) survivors have depressive symptoms 2-12 months after hospital discharge. We examined the prevalence of depressive symptoms and risk factors for depressive symptoms in 204 patients at their initial evaluation in the Critical Care Recovery Center (CCRC), an ICU survivor clinic based at Eskenazi Hospital in Indianapolis, Indiana. Thirty-two percent (N = 65) of patients had depressive symptoms on initial CCRC visit. For patients who are not on an antidepressant at their initial CCRC visit (N = 135), younger age and lower education level were associated with a higher likelihood of having depressive symptoms...
September 2017: Journal of Hospital Medicine: An Official Publication of the Society of Hospital Medicine
https://www.readbyqxmd.com/read/28911339/emerging-treatments-for-the-behavioral-and-psychological-symptoms-of-dementia
#8
Abhinav Anand, Puneet Khurana, Jasneet Chawla, Neha Sharma, Navneet Khurana
Dementia is referred to a loss of memory and decline in other mental abilities at levels critical enough to hinder performance of daily activities. It can be of several types, depending on the underlying pathophysiology. The behavioral and psychological symptoms of dementia (BPSD) are various, but the most clinically significant are depression, apathy, and anxiety. Other BPSD include agitation, aberrant motor behavior, elation, hallucinations, and alterations in sleep and appetite. About 90% of sufferers of dementia are affected by BPSD during the course of the illness...
September 15, 2017: CNS Spectrums
https://www.readbyqxmd.com/read/28903117/the-mortality-and-myocardial-effects-of-antidepressants-are-moderated-by-preexisting-cardiovascular-disease-a-meta-analysis
#9
Marta M Maslej, Benjamin M Bolker, Marley J Russell, Keifer Eaton, Zachary Durisko, Steven D Hollon, G Marie Swanson, J Anderson Thomson, Benoit H Mulsant, Paul W Andrews
BACKGROUND: Antidepressants (ADs) are commonly prescribed medications, but their long-term health effects are debated. ADs disrupt multiple adaptive processes regulated by evolutionarily ancient biochemicals, potentially increasing mortality. However, many ADs also have anticlotting properties that can be efficacious in treating cardiovascular disease. We conducted a meta-analysis assessing the effects of ADs on all-cause mortality and cardiovascular events in general-population and cardiovascular-patient samples...
September 14, 2017: Psychotherapy and Psychosomatics
https://www.readbyqxmd.com/read/28899662/baseline-association-of-motoric-cognitive-risk-syndrome-with-sustained-attention-memory-and-global-cognition
#10
Fiachra J Maguire, Isabelle Killane, Andrew P Creagh, Orna Donoghue, Rose Anne Kenny, Richard B Reilly
OBJECTIVES: Slow gait has been shown to be a good predictor of declining cognitive function in healthy older adults. Motoric cognitive risk (MCR) syndrome is a new construct incorporating slow gait and subjective cognitive complaints in individuals without dementia who have preserved activities of daily living. This analysis investigated the prevalence of MCR and factors associated with MCR in a nationally representative population. In addition, cross-sectional associations between MCR and cognitive domains, an relationship yet to be fully elucidated in literature, was investigated...
September 9, 2017: Journal of the American Medical Directors Association
https://www.readbyqxmd.com/read/28893095/efficacy-of-antidepressants-bias-in-randomized-clinical-trials-and-related-issues
#11
Sheng-Min Wang, Changsu Han, Soo-Jung Lee, Tae-Youn Jun, Ashwin A Patkar, Prakash S Masand, Chi-Un Pae
Countless antidepressant randomized trials were conducted and showed statistically significant benefits of selective serotonin reuptake inhibitors (SSRIs) and serotonin-norepinephrine reuptake inhibitors (SNRIs) over placebo. Meanwhile, critics are increasing regarding the efficacy of antidepressants in the treatment of MDD because at least a proportion of clinical trials could be hampered by various biases. In contrast, number of failed trials is increasing in the recent years which have made developing psychiatric medications progressively more time-consuming and expensive...
September 14, 2017: Expert Review of Clinical Pharmacology
https://www.readbyqxmd.com/read/28888484/prediction-of-human-efficacious-antidepressant-doses-using-the-mouse-forced-swim-test
#12
Eunice Yuen, Steven Swanson, Jeffrey M Witkin
The forced swim test (FST) is a commonly used preclinical animal behavioural model for prediction of antidepressant activity in humans. While the FST may qualitatively predict efficacy, less is known about the quantitative translation of FST data to human efficacious doses. Assessing quantitative translation allows better predictions of human efficacious doses and a higher chance of success in the drug development process. Dose-response and time-course FST experiments were carried out on mice using four marketed antidepressants (citalopram, desipramine, bupropion, desvenlafaxine) in addition to ketamine, all with varying mechanisms of action...
September 6, 2017: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/28886235/in-the-search-for-a-lead-structure-among-series-of-potent-and-selective-hydantoin-5-ht7-r-agents-the-drug-likeness-in-vitro-study
#13
Gniewomir Latacz, Annamaria Lubelska, Magdalena Jastrzębska-Więsek, Anna Partyka, Andrzej Sobiło, Agnieszka Olejarz, Katarzyna Kucwaj-Brysz, Grzegorz Satała, Andrzej J Bojarski, Anna Wesołowska, Katarzyna Kieć-Kononowicz, Jadwiga Handzlik
Since the year 1993, when 5-HT7 receptor (5-HT7 R) was discovered, there is no selective 5-HT7 R ligand introduced to the pharmaceutical market. One out of the main reasons disqualifying the 5-HT7 R ligands are weak drugability properties, including metabolic instability or low permeability. This study is focused on the search of a lead compound by "drug-likeness" estimation of the first series of selective and potent 5-HT7 R ligands among 5-(4-fluorophenyl)-3-(2-hydroxy-3-(4-aryl-piperazin-1-yl)propyl)-5-methyl-imidazolidine-2,4-dione derivatives (11-16)...
September 8, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28880242/synthesis-and-antidepressant-activity-profile-of-some-novel-benzothiazole-derivatives
#14
Ümide Demir Özkay, Ceren Kaya, Ulviye Acar Çevik, Özgür Devrim Can
Within the scope of our new antidepressant drug development efforts, in this study, we synthesized eight novel benzothiazole derivatives 3a-3h. The chemical structures of the synthesized compounds were elucidated by spectroscopic methods. Test compounds were administered orally at a dose of 40 mg/kg to mice 24, 5 and 1 h before performing tail suspension, modified forced swimming, and activity cage tests. The obtained results showed that compounds 3c, 3d, 3f-3h reduced the immobility time of mice as assessed in the tail suspension test...
September 7, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28877907/antidepressant-use-during-pregnancy-and-psychiatric-disorders-in-offspring-danish-nationwide-register-based-cohort-study
#15
Xiaoqin Liu, Esben Agerbo, Katja G Ingstrup, Katherine Musliner, Samantha Meltzer-Brody, Veerle Bergink, Trine Munk-Olsen
Objective To investigate the association between in utero exposure to antidepressants and risk of psychiatric disorders.Design Population based cohort study.Setting Danish national registers.Participants 905 383 liveborn singletons born during 1998-2012 in Denmark and followed from birth until July 2014, death, emigration, or date of first psychiatric diagnosis, whichever came first. The children were followed for a maximum of 16.5 years and contributed 8.1×10(6) person years at risk.Exposures for observational studies Children were categorised into four groups according to maternal antidepressant use within two years before and during pregnancy: unexposed, antidepressant discontinuation (use before but not during pregnancy), antidepressant continuation (use both before and during pregnancy), and new user (use only during pregnancy)...
September 6, 2017: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/28873974/therapeutic-drug-monitoring-of-fluoxetine-norfluoxetine-and-paroxetine-a-new-tool-based-on-microextraction-by-packed-sorbent-coupled-to-liquid-chromatography
#16
Paulo Magalhães, Gilberto Alves, Adrián Llerena, Amílcar Falcão
The present article reports the first liquid chromatography (LC) assay for the simultaneous quantification of fluoxetine (FLU), its metabolite norfluoxetine (NFLU) and paroxetine (PAR) in human plasma, applying the microextraction by packed sorbent (MEPS) technology in sample preparation. Chromatographic analysis of FLU, NFLU and PAR was achieved in <13 min on a reverse-phase C18 column using isocratic elution and fluorescence detection (FLD). The mobile phase was composed by an aqueous solution of 25 mM sodium phosphate monobasic anhydrous and 7...
September 1, 2017: Journal of Analytical Toxicology
https://www.readbyqxmd.com/read/28871327/micronutrient-intake-adequacy-and-depression-risk-in-the-sun-cohort-study
#17
Almudena Sánchez-Villegas, Aurora Pérez-Cornago, Itziar Zazpe, Susana Santiago, Francisca Lahortiga, Miguel Angel Martínez-González
PURPOSE: The aim of the study was to prospectively assess the association between micronutrient intake adequacy and risk of depression. METHODS: This dynamic cohort study involves Spanish university graduates (SUN Project). Dietary intake was assessed at baseline and after 10 years of follow-up with a semi-quantitative food frequency questionnaire. Micronutrient intake adequacy for vitamins B1, B2, B3, B6, B12, C, A, D, E, folic acid, zinc, iodine, selenium, iron, calcium, potassium, phosphorus, magnesium and chrome was estimated...
September 4, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28867363/methoxetamine-produces-rapid-and-sustained-antidepressant-effects-probably-via-glutamatergic-and-serotonergic-mechanisms
#18
Chrislean Jun Botanas, June Bryan de la Peña, Raly James Custodio, Irene Joy Dela Peña, Mikyung Kim, Taeseon Woo, Hee Jin Kim, Hye In Kim, Min Chang Cho, Yong Sup Lee, Jae Hoon Cheong
Depression afflicts around 16% of the world's population, making it one of the leading causes of disease burden worldwide. Despite a number of antidepressants available today, the delayed onset time and low remission rate of these treatments are still a major challenge. The N-methyl-D-aspartate (NMDA) receptor antagonist ketamine has shown to produce rapid and sustained antidepressant effects and has paved the way for a new generation of glutamate-based antidepressants. Methoxetamine (MXE) is a ketamine analogue that acts as an NMDA receptor antagonist and a serotonin reuptake inhibitor...
September 1, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28858536/serotonin-and-brain-function-a-tale-of-two-receptors
#19
R L Carhart-Harris, D J Nutt
Previous attempts to identify a unified theory of brain serotonin function have largely failed to achieve consensus. In this present synthesis, we integrate previous perspectives with new and older data to create a novel bipartite model centred on the view that serotonin neurotransmission enhances two distinct adaptive responses to adversity, mediated in large part by its two most prevalent and researched brain receptors: the 5-HT1A and 5-HT2A receptors. We propose that passive coping (i.e. tolerating a source of stress) is mediated by postsynaptic 5-HT1AR signalling and characterised by stress moderation...
August 1, 2017: Journal of Psychopharmacology
https://www.readbyqxmd.com/read/28855875/therapeutic-potential-of-selectively-targeting-the-%C3%AE-2c-adrenoceptor-in-cognition-depression-and-schizophrenia-new-developments-and-future-perspective
#20
REVIEW
Madeleine Monique Uys, Mohammed Shahid, Brian Herbert Harvey
α2A- and α2C-adrenoceptors (ARs) are the primary α2-AR subtypes involved in central nervous system (CNS) function. These receptors are implicated in the pathophysiology of psychiatric illness, particularly those associated with affective, psychotic, and cognitive symptoms. Indeed, non-selective α2-AR blockade is proposed to contribute toward antidepressant (e.g., mirtazapine) and atypical antipsychotic (e.g., clozapine) drug action. Both α2C- and α2A-AR share autoreceptor functions to exert negative feedback control on noradrenaline (NA) release, with α2C-AR heteroreceptors regulating non-noradrenergic transmission (e...
2017: Frontiers in Psychiatry
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