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https://www.readbyqxmd.com/read/29676713/-deep-brain-stimulation-for-psychiatric-disorders
#1
M Figee, P R Schuurman, D Denys
- Deep brain stimulation (DBS) corrects pathological activity of neuropsychiatric brain networks with high frequency current via implanted brain electrodes.- DBS is an effective and safe treatment for therapy-refractory obsessive-compulsive disorder and potentially also for therapy-refractory major depressive disorder.- Experimental psychiatric indications for DBS are Tourette syndrome, addiction, anorexia nervosa, post-traumatic stress disorder, autism and schizophrenia.- DBS influences brain networks that are relevant for a variety of psychiatric symptoms...
2018: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/29656951/auditory-system-target-engagement-during-plasticity-based-interventions-in-schizophrenia-a-focus-on-modulation-of-n-methyl-d-aspartate-type-glutamate-receptor-function
#2
REVIEW
Joshua T Kantrowitz, Neal R Swerdlow, Walter Dunn, Sophia Vinogradov
Cognitive deficits are predictive of long-term social and occupational functional deficits in schizophrenia but are currently without gold-standard treatments. In particular, augmentation of auditory cortical neuroplasticity may represent a rate-limiting first step before addressing higher-order cognitive deficits. We review the rationale for N-methyl-d-aspartate-type glutamate receptor (NMDAR) modulators as treatments for auditory plasticity deficits in schizophrenia, along with potential serum and electroencephalographic target engagement biomarkers for NMDAR function...
February 22, 2018: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
https://www.readbyqxmd.com/read/29611450/elevated-serum-vascular-endothelial-growth-factor-in-treatment-resistant-schizophrenia-treated-with-electroconvulsive-therapy-positive-association-with-therapeutic-effects
#3
Wenhuan Xiao, Qiongqiong Zhan, Fei Ye, Xiaowei Tang, Jin Li, Hui Dong, Weiwei Sha, Xiaobin Zhang
OBJECTIVES: As the name implies, vascular endothelial growth factor (VEGF) enhances angiogenesis, promotes vascular permeability, and stimulates neurogenesis in the adult brain. Furthermore, animal model studies have shown that electroconvulsive therapy (ECT), which is primarily utilized in cases of treatment-resistant schizophrenia (TRS), regulates the expression of VEGF. The current study focuses largely on the effect of ECT on VEGF serum concentration, and the relationship between VEGF and therapeutic effects in patients diagnosed with TRS...
April 3, 2018: World Journal of Biological Psychiatry
https://www.readbyqxmd.com/read/29610457/cntnap2-stabilizes-interneuron-dendritic-arbors-through-cask
#4
Ruoqi Gao, Nicolas H Piguel, Alexandria E Melendez-Zaidi, Maria Dolores Martin-de-Saavedra, Sehyoun Yoon, Marc P Forrest, Kristoffer Myczek, Gefei Zhang, Theron A Russell, John G Csernansky, D James Surmeier, Peter Penzes
Contactin associated protein-like 2 (CNTNAP2) has emerged as a prominent susceptibility gene implicated in multiple complex neurodevelopmental disorders, including autism spectrum disorders (ASD), intellectual disability (ID), and schizophrenia (SCZ). The presence of seizure comorbidity in many of these cases, as well as inhibitory neuron dysfunction in Cntnap2 knockout (KO) mice, suggests CNTNAP2 may be crucial for proper inhibitory network function. However, underlying cellular mechanisms are unclear. Here we show that cultured Cntnap2 KO mouse neurons exhibit an inhibitory neuron-specific simplification of the dendritic tree...
April 2, 2018: Molecular Psychiatry
https://www.readbyqxmd.com/read/29602521/animal-models-of-addiction-and-neuropsychiatric-disorders-and-their-role-in-drug-discovery-honoring-the-legacy-of-athina-markou
#5
REVIEW
Paul J Kenny, Daniel Hoyer, George F Koob
Each of the co-authors worked with Athina Markou, at different stages of our careers and in different capacities, to develop, optimize, and use animal models of drug addiction and, more generally, mental health disorders such as anxiety, depression, and schizophrenia. Here, we briefly summarize some of our work with Athina, primarily involving the use of the intracranial self-stimulation and intravenous drug self-administration procedures. This work established that excessive consumption of addictive drugs can induce profound dysfunction in brain reward circuits...
February 22, 2018: Biological Psychiatry
https://www.readbyqxmd.com/read/29596955/alterations-of-complex-mismatch-negativity-cmmn-elicited-by-a-two-tone-pattern-paradigm-in-early-phase-psychosis
#6
Emma M L Ells, Erica D Rudolph, Lauren Sculthorpe-Petley, Shelagh C Abriel, Debra J Campbell, Philip G Tibbo, Derek J Fisher
The mismatch negativity (MMN) is a component of the event-related potential (ERP) elicited by a change in auditory stimulation (e.g., the occurrence of a deviant sound that violates the rules or regularities of the preceding stimulus sequence) regardless of whether one is attending to the change or not. As such, the MMN provides a useful index of pre-attentive cognition. While decreases in MMN amplitude are robustly observed in chronic schizophrenia, these deficits are less consistently present at the early phase of the illness...
March 26, 2018: Biological Psychology
https://www.readbyqxmd.com/read/29559020/gene-polymorphisms-and-response-to-transcranial-direct-current-stimulation-for-auditory-verbal-hallucinations-in-schizophrenia
#7
Harleen Chhabra, Venkataram Shivakumar, Manjula Subbanna, Sunil V Kalmady, Anushree Bose, Sri Mahavir Agarwal, Vanteemar S Sreeraj, Damodharan Dinakaran, Janardhanan C Narayanaswamy, Monojit Debnath, Ganesan Venkatasubramanian
OBJECTIVE: Recent observations demonstrate a significant ameliorative effect of add-on transcranial direct current stimulation (tDCS) on auditory verbal hallucinations (AVHs) in schizophrenia. Of the many SNPs, NRG1 rs35753505 and catechol-o-methyl transferase (COMT) rs4680 polymorphisms have shown to have a strong association with neuroplasticity effect in schizophrenia. METHODS: Schizophrenia patients (n=32) with treatment resistant auditory hallucinations were administered with an add-on tDCS...
March 21, 2018: Acta Neuropsychiatrica
https://www.readbyqxmd.com/read/29552509/effects-of-transcranial-direct-current-stimulation-on-working-memory-and-negative-symptoms-in-schizophrenia-a-phase-ii-randomized-sham-controlled-trial
#8
J S Gomes, A P Trevizol, D V Ducos, A Gadelha, B B Ortiz, A O Fonseca, H T Akiba, C C Azevedo, L S P Guimaraes, P Shiozawa, Q Cordeiro, A Lacerda, A M Dias
Background: The lack of efficacy of pharmacological treatments for cognitive and negative symptoms in schizophrenia highlights the need for new interventions. We investigated the effects of tDCS on working memory and negative symptoms in patients with schizophrenia. Method: Double-blinded, randomized, sham-controlled clinical trial, investigating the effects of 10 sessions of tDCS in schizophrenia subjects. Stimulation used 2 mA, for 20 min, with electrodes of 25 cm2 wrapped in cotton material soaked in saline solution...
June 2018: Schizophrenia Research. Cognition
https://www.readbyqxmd.com/read/29533819/randomized-trial-of-transcranial-alternating-current-stimulation-for-treatment-of-auditory-hallucinations-in-schizophrenia
#9
Juliann M Mellin, Sankaraleengam Alagapan, Caroline Lustenberger, Courtney E Lugo, Morgan L Alexander, John H Gilmore, L Fredrik Jarskog, Flavio Fröhlich
BACKGROUND: Approximately 30% of patients with schizophrenia experience auditory hallucinations that are refractory to antipsychotic medications. Here, we evaluated the feasibility and efficacy of transcranial alternating current stimulation (tACS) that we hypothesized would improve auditory hallucination symptoms by enhancing synchronization between the frontal and temporo-parietal areas of the left hemisphere. METHOD: 22 participants were randomized to one of three arms and received twice daily, 20 min sessions of sham, 10 Hz 2 mA peak-to-peak tACS, or 2 mA tDCS over the course of 5 consecutive days...
March 10, 2018: European Psychiatry: the Journal of the Association of European Psychiatrists
https://www.readbyqxmd.com/read/29529412/transsaccadic-perception-deficits-in-schizophrenia-reflect-the-improper-internal-monitoring-of-eye-movement-rather-than-abnormal-sensory-processing
#10
Sonia Bansal, Laurence C Jayet Bray, Barbara L Schwartz, Wilsaan M Joiner
BACKGROUND: Symptoms of psychosis in schizophrenia reflect disturbances in sense of agency-difficulty distinguishing internally from externally generated sensory and perceptual experiences. One theory attributes these anomalies to a disruption in corollary discharge (CD), an internal copy of generated motor commands used to distinguish self-movement-generated sensations from externally generated stimulation. METHODS: We used a transsaccadic shift detection paradigm to examine possible deficits in CD and sense of agency based on the ability to perceive visual changes in 31 schizophrenia patients (SZPs) and 31 healthy control subjects...
February 2018: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
https://www.readbyqxmd.com/read/29528896/toward-personalized-treatment-of-hallucinations
#11
Iris E Sommer, Hidde Kleijer, Kenneth Hugdahl
PURPOSE OF REVIEW: Hallucinations are common and often stressful experiences, occurring in all sensory modalities. They frequently complicate many disorders or situations, such as Parkinson's disease, schizophrenia, hearing or vision loss, intoxications and delirium. Although psychoeducation, coping techniques and psychotherapy may be broadly applicable, they do not address a specific underlying brain mechanism. Pharmacotherapy may effectively alleviate hallucinations if the corresponding mechanism is present, whereas in its absence, may only cause harmful side effects...
May 2018: Current Opinion in Psychiatry
https://www.readbyqxmd.com/read/29523414/presynaptic-effects-of-n-methyl-d-aspartate-receptors-enhance-parvalbumin-cell-mediated-inhibition-of-pyramidal-cells-in-mouse-prefrontal-cortex
#12
Diego E Pafundo, Takeaki Miyamae, David A Lewis, Guillermo Gonzalez-Burgos
BACKGROUND: Testing hypotheses regarding the role of N-methyl-D-aspartate receptor (NMDAR) hypofunction in schizophrenia requires understanding the mechanisms of NMDAR regulation of prefrontal cortex (PFC) circuit function. NMDAR antagonists are thought to produce pyramidal cell (PC) disinhibition. However, inhibitory parvalbumin-positive basket cells (PVBCs) have modest NMDAR-mediated excitatory drive and thus are unlikely to participate in NMDAR antagonist-mediated disinhibition. Interestingly, recent studies demonstrated that presynaptic NMDARs enhance transmitter release at central synapses...
January 31, 2018: Biological Psychiatry
https://www.readbyqxmd.com/read/29519756/effects-of-cannabis-use-on-body-mass-fasting-glucose-and-lipids-during-the-first-12-months-of-treatment-in-schizophrenia-spectrum-disorders
#13
F Scheffler, S Kilian, B Chiliza, L Asmal, L Phahladira, S du Plessis, M Kidd, R M Murray, M Di Forti, S Seedat, R Emsley
While acute cannabis use stimulates appetite, general population studies suggest that chronic use is associated with reduced risk of obesity and other cardiometabolic risk factors. In this study we investigated changes in body mass index (BMI), fasting blood glucose and lipids, and rates of metabolic syndrome risk factors in cannabis users vs. non-users in 109 minimally treated patients with first-episode schizophrenia, schizophreniform or schizo-affective disorder who were treated according to a standardized treatment regime with depot antipsychotic medication over 12 months...
March 6, 2018: Schizophrenia Research
https://www.readbyqxmd.com/read/29518740/sleep-endocrine-effects-of-growth-hormone-releasing-hormone-ghrh-in-patients-with-schizophrenia
#14
Heike Künzel, Katja Held, Dagmar Schmidt, Marc Ziegenbein, Harald Murck, Axel Steiger
Changes in sleep-EEG after endocrine stimulation tests in patients with schizophrenia include reduced sleep efficiency, prolonged sleep latency and increased awaking after sleep onset Findings on sleep associated growth hormone (GH) secretion were ambiguous. The aim of this study was to elucidate the sleep-endocrine activity especially in the GH system of patients with schizophrenia after repeated administration of GHRH. The effect of repetitive injections of 4 × 50 μg GHRH between 22.00 and 01.00 h on sleep endocrine parameters was investigated in 9 patients diagnosed for schizophrenia...
March 1, 2018: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/29516204/seeing-the-world-as-it-is-mimicking-veridical-motion-perception-in-schizophrenia-using-non-invasive-brain-stimulation-in-healthy-participants
#15
Gorana Pobric, Johan Hulleman, Michal Lavidor, Gail Silipo, Stephanie Rohrig, Elisa Dias, Daniel C Javitt
Schizophrenia (Sz) is a mental health disorder characterized by severe cognitive, emotional, social, and perceptual deficits. Visual deficits are found in tasks relying on the magnocellular/dorsal stream. In our first experiment we established deficits in global motion processing in Sz patients compared to healthy controls. We used a novel task in which background optic flow produces a distortion of the apparent trajectory of a moving stimulus, leading control participants to provide biased estimates of the true motion trajectory under conditions of global stimulation...
March 7, 2018: Brain Topography
https://www.readbyqxmd.com/read/29496479/multisensory-cortical-processing-and-dysfunction-across-the-neuropsychiatric-spectrum
#16
REVIEW
Betty E Hornix, Robbert Havekes, Martien J H Kas
Sensory processing is affected in multiple neuropsychiatric disorders like schizophrenia and autism spectrum disorders. Genetic and environmental factors guide the formation and fine-tuning of brain circuitry necessary to receive, organize, and respond to sensory input in order to behave in a meaningful and consistent manner. During certain developmental stages the brain is sensitive to intrinsic and external factors. For example, disturbed expression levels of certain risk genes during critical neurodevelopmental periods may lead to exaggerated brain plasticity processes within the sensory circuits, and sensory stimulation immediately after birth contributes to fine-tuning of these circuits...
February 26, 2018: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/29492786/functional-coupling-between-adenosine-a-1-receptors-and-g-proteins-in-rat-and-postmortem-human-brain-membranes-determined-with-conventional-guanosine-5-o-3-35-s-thio-triphosphate-35-s-gtp%C3%AE-s-binding-or-35-s-gtp%C3%AE-s-immunoprecipitation-assay
#17
Yuji Odagaki, Masakazu Kinoshita, Toshio Ota, J Javier Meana, Luis F Callado, Isao Matsuoka, Jesús A García-Sevilla
Adenosine signaling plays a complex role in multiple physiological processes in the brain, and its dysfunction has been implicated in pathophysiology of neuropsychiatric diseases such as schizophrenia and affective disorders. In the present study, the coupling between adenosine A1 receptor and G-protein was assessed by means of two [35 S]GTPγS binding assays, i.e., conventional filtration method and [35 S]GTPγS binding/immunoprecipitation in rat and human brain membranes. The latter method provides information about adenosine A1 receptor-mediated Gαi-3 activation in rat as well as human brain membranes...
February 28, 2018: Purinergic Signalling
https://www.readbyqxmd.com/read/29486960/effects-of-short-term-high-frequency-repetitive-transcranial-magnetic-stimulation-to-bilateral-dorsolateral-prefrontal-cortex-on-smoking-behavior-and-cognition-in-patients-with-schizophrenia-and-non-psychiatric-controls
#18
Karolina Kozak, Maryam Sharif-Razi, Marya Morozova, Erin V Gaudette, Mera S Barr, Zafiris J Daskalakis, Daniel M Blumberger, Tony P George
BACKGROUND: High rates of tobacco smoking and smoking cessation failure in schizophrenia may be related to prefrontal cortical dysfunction. Novel treatment options for tobacco use disorder are needed given the limited efficacy of current pharmacotherapies. Preliminary evidence suggests high-frequency repetitive transcranial magnetic stimulation (rTMS) to bilateral dorsolateral prefrontal cortex (DLPFC) may suppress tobacco craving in smokers with schizophrenia. The goal of this study was to determine effects of rTMS for tobacco craving and cognition using a short-term (3-day) human laboratory paradigm...
February 24, 2018: Schizophrenia Research
https://www.readbyqxmd.com/read/29483660/multiple-long-range-inputs-evoke-nmda-currents-in-prefrontal-cortex-fast-spiking-interneurons
#19
Luke Joseph Bogart, Patricio O'Donnell
Several aspects of schizophrenia can be mimicked acutely in healthy human volunteers via administration of NMDA glutamate receptor (NMDAR) antagonists. As these agents decrease firing rates in prefrontal cortical (PFC) GABAergic fast-spiking interneurons (FSI) in animal studies, a leading hypothesis on schizophrenia pathophysiology is that NMDAR in FSI are impaired. However, whole-cell recordings of FSI in slices of adult mouse PFC revealed limited amounts of NMDAR-mediated current. Since those studies used local electrical stimulation to activate a heterogeneous set of synaptic inputs to the recorded cell, it is unclear whether specific afferent inputs may preferentially drive NMDAR responses in FSI...
February 26, 2018: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29482042/efficacy-of-high-frequency-repetitive-transcranial-magnetic-stimulation-on-panss-factors-in-schizophrenia-with-predominant-negative-symptoms-results-from-an-exploratory-re-analysis
#20
Maximilian Hansbauer, Thomas Wobrock, Birgit Kunze, Berthold Langguth, Michael Landgrebe, Peter Eichhammer, Elmar Frank, Joachim Cordes, Wolfgang Wölwer, Georg Winterer, Wolfgang Gaebel, Göran Hajak, Christian Ohmann, Pablo E Verde, Marcella Rietschel, Raees Ahmed, William G Honer, Berend Malchow, Wolfgang Strube, Thomas Schneider-Axmann, Peter Falkai, Alkomiet Hasan
Repetitive transcranial magnetic stimulation (rTMS) applied to the left frontal lobe is discussed to be a promising add-on treatment for negative symptoms in schizophrenia. The Positive and Negative Syndrome Scale (PANSS) has been used as outcome parameter in several previous rTMS trials, but studies focusing on PANSS factor analyses are lacking. For this purpose, we used the available PANSS data of the 'rTMS for the Treatment of Negative Symptoms in Schizophrenia' (RESIS) trial to calculate different literature-based PANSS factors and to re-evaluate the impact of rTMS on negative symptoms in this trial...
February 17, 2018: Psychiatry Research
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