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https://www.readbyqxmd.com/read/29155259/polyi-c-model-of-schizophrenia-in-rats-induces-functional-brain-changes-detected-by-mri-irreversible-by-aripiprazole-treatment
#1
Eva Drazanova, Jana Ruda-Kucerova, Lucie Kratka, Katerina Horska, Regina Demlova, Zenon Starcuk, Tomas Kasparek
BACKGROUND AND PURPOSE: One of the hallmarks of schizophrenia is altered brain structure, potentially due to antipsychotic treatment, the disorder itself or both. It was proposed that functional changes may precede the structural ones. In order to understand and potentially prevent this unwanted process, brain function assessment should be validated as a diagnostic tool. METHODS: We used Arterial Spin Labelling MRI technique for the evaluation of brain perfusion in several brain regions in a neurodevelopmental poly(I:C) model of schizophrenia (8 mg/kg on a gestational day 15) in rats taking into account sex-dependent effects and chronic treatment with aripiprazole (30 days), an atypical antipsychotic acting as a partial agonist on dopaminergic receptors...
November 16, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/29153446/the-instability-of-functional-connectivity-in-patients-with-schizophrenia-and-their-siblings-a-dynamic-connectivity-study
#2
Shuixia Guo, Wei Zhao, Haojuan Tao, Zhening Liu, Lena Palaniyappan
BACKGROUND: The distributed connectivity among brain regions is in a constant state of flux, even when a subject is at rest. This instability (temporal variability), when optimal, may contribute to efficient cross-network communications. We investigate the role of this variability in the genetic diathesis and symptom expression of schizophrenia. METHODS: Resting state functional MRI data acquired from 116 subjects (28 patients with schizophrenia, 28 siblings and 60 matched healthy controls)...
November 15, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/29136642/common-and-distinct-structural-features-of-schizophrenia-and-bipolar-disorder-the-european-network-on-psychosis-affective-disorders-and-cognitive-trajectory-enpact-study
#3
Eleonora Maggioni, Benedicto Crespo-Facorro, Igor Nenadic, Francesco Benedetti, Christian Gaser, Heinrich Sauer, Roberto Roiz-Santiañez, Sara Poletti, Veronica Marinelli, Marcella Bellani, Cinzia Perlini, Mirella Ruggeri, A Carlo Altamura, Vaibhav A Diwadkar, Paolo Brambilla
INTRODUCTION: Although schizophrenia (SCZ) and bipolar disorder (BD) share elements of pathology, their neural underpinnings are still under investigation. Here, structural Magnetic Resonance Imaging (MRI) data collected from a large sample of BD and SCZ patients and healthy controls (HC) were analyzed in terms of gray matter volume (GMV) using both voxel based morphometry (VBM) and a region of interest (ROI) approach. METHODS: The analysis was conducted on two datasets, Dataset1 (802 subjects: 243 SCZ, 176 BD, 383 HC) and Dataset2, a homogeneous subset of Dataset1 (301 subjects: 107 HC, 85 BD and 109 SCZ)...
2017: PloS One
https://www.readbyqxmd.com/read/29111383/disturbed-glutathione-antioxidative-defense-is-associated-with-structural-brain-changes-in-neuroleptic-na%C3%A3-ve-first-episode-psychosis-patients
#4
K Langbein, J Hesse, A Gussew, B Milleit, S Lavoie, G P Amminger, C Gaser, G Wagner, J R Reichenbach, U-C Hipler, D Winter, S Smesny
BACKGROUND: Oxidative stress and impaired antioxidant defense are reported in schizophrenia and are thought to be associated with disturbed neurodevelopment, brain structural alterations, glutamatergic imbalance, negative symptomatology, and cognitive impairment. To test some of these assumptions we investigated the glutathione (GSH) antioxidant defense system (AODS) and brain structural abnormalities in drug-naïve individuals with first acute episode of psychosis (FEP). METHOD: The study involved 27 drug-naïve FEP patients and 31 healthy controls (HC)...
October 18, 2017: Prostaglandins, Leukotrienes, and Essential Fatty Acids
https://www.readbyqxmd.com/read/29079398/the-neural-correlates-of-apathy-in-schizophrenia-an-exploratory-investigation
#5
Fernando Caravaggio, Gagan Fervaha, Mahesh Menon, Gary Remington, Ariel Graff-Guerrero, Philip Gerretsen
BACKGROUND: Motivational deficits represent a core negative symptom in patients with schizophrenia. Previous morphology studies have demonstrated that apathy in patients with schizophrenia is associated with reduced frontal grey matter (GM). We attempted to replicate this previous finding, and explored whether it was distinct from potential associations with a distinct subdomain of negative symptoms, namely Affective Flattening, and GM. METHODS: Twenty medicated patients with schizophrenia provided structural T1-weighted images acquired on a 3-Tesla MRI scanner and negative symptoms were evaluated using the Scale for the Assessment of Negative Symptoms...
October 24, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/29079060/omega-3-fatty-acid-supplementation-may-prevent-loss-of-gray-matter-thickness-in-the-left-parieto-occipital-cortex-in-first-episode-schizophrenia-a-secondary-outcome-analysis-of-the-offer-randomized-controlled-study
#6
Tomasz Pawełczyk, Ewa Piątkowska-Janko, Piotr Bogorodzki, Piotr Gębski, Marta Grancow-Grabka, Elżbieta Trafalska, Natalia Żurner, Agnieszka Pawełczyk
The aim of the study was to assess changes in cortical thickness related to the use of n-3 polyunsaturated fatty acids (PUFA) as add-on therapy in patients with first episode schizophrenia. A double-blind randomized controlled study was conducted using a 26-week intervention composed of concentrated fish oil containing 2.2g/d of eicosapentaenoic (EPA) and docosahexaenoic acid (DHA) or placebo (olive oil). Participants underwent MRI scanning twice to assess changes in cortical thickness: at the beginning and at the end of intervention...
October 24, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/29074330/motor-dysfunction-as-an-intermediate-phenotype-across-schizophrenia-and-other-psychotic-disorders-progress-and-perspectives
#7
Dusan Hirjak, Katharina M Kubera, Philipp A Thomann, Robert C Wolf
Primary motor abnormalities (PMA), as found in patients with schizophrenia, are quantitatively and qualitatively distinct markers of motor system abnormalities. PMA have been often referred to phenomena that are present across schizophrenia-spectrum disorders. A dysfunction of frontoparietal and subcortical networks has been proposed as core pathophysiological mechanism underlying the expression of PMA. However, it is unclear at present if such mechanisms are a common within schizophrenia and other psychotic disorders...
October 23, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/29058358/an-investigation-of-regional-cerebral-blood-flow-and-tissue-structure-changes-after-acute-administration-of-antipsychotics-in-healthy-male-volunteers
#8
Peter C T Hawkins, Tobias C Wood, Anthony C Vernon, Alessandro Bertolino, Fabio Sambataro, Juergen Dukart, Emilio Merlo-Pich, Celine Risterucci, Hanna Silber-Baumann, Eamonn Walsh, Ndabezinhle Mazibuko, Fernando O Zelaya, Mitul A Mehta
Chronic administration of antipsychotic drugs has been linked to structural brain changes observed in patients with schizophrenia. Recent MRI studies have shown rapid changes in regional brain volume following just a single dose of these drugs. However, it is not clear if these changes represent real volume changes or are artefacts ("apparent" volume changes) due to drug-induced physiological changes, such as increased cerebral blood flow (CBF). To address this, we examined the effects of a single, clinical dose of three commonly prescribed antipsychotics on quantitative measures of T1 and regional blood flow of the healthy human brain...
October 23, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/29050384/stimulating-thought-a-functional-mri-study-of-transcranial-direct-current-stimulation-in-schizophrenia
#9
RANDOMIZED CONTROLLED TRIAL
Natasza D Orlov, Owen O'Daly, Derek K Tracy, Yusuf Daniju, John Hodsoll, Lorena Valdearenas, John Rothwell, Sukhi S Shergill
Individuals with schizophrenia typically suffer a range of cognitive deficits, including prominent deficits in working memory and executive function. These difficulties are strongly predictive of functional outcomes, but there is a paucity of effective therapeutic interventions targeting these deficits. Transcranial direct current stimulation is a novel neuromodulatory technique with emerging evidence of potential pro-cognitive effects; however, there is limited understanding of its mechanism. This was a double-blind randomized sham controlled pilot study of transcranial direct current stimulation on a working memory (n-back) and executive function (Stroop) task in 28 individuals with schizophrenia using functional magnetic resonance imaging...
September 1, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29049083/ketamine-and-pharmacological-imaging-use-of-functional-magnetic-resonance-imaging-to-evaluate-mechanisms-of-action
#10
Eric A Maltbie, Gopinath S Kaundinya, Leonard L Howell
Ketamine has been used as a pharmacological model for schizophrenia as subanesthetic infusions have been shown to produce temporary schizophrenia-like symptoms in healthy humans. More recently, ketamine has emerged as a potential treatment for multiple psychiatric disorders, including treatment-resistant depression and suicidal ideation. However, the mechanisms underlying both the psychotomimetic and the therapeutic effects of ketamine remain poorly understood. This review provides an overview of what is known of the neural mechanisms underlying the effects of ketamine and details what functional MRI studies have yielded at a systems level focused on brain circuitry...
December 2017: Behavioural Pharmacology
https://www.readbyqxmd.com/read/29042073/functional-network-dysconnectivity-as-a-biomarker-of-treatment-resistance-in-schizophrenia
#11
Carolyn B McNabb, Roger J Tait, Meghan E McIlwain, Valerie M Anderson, John Suckling, Robert R Kydd, Bruce R Russell
Schizophrenia may develop from disruptions in functional connectivity regulated by neurotransmitters such as dopamine and acetylcholine. The modulatory effects of these neurotransmitters might explain how antipsychotics attenuate symptoms of schizophrenia and account for the variable response to antipsychotics observed in clinical practice. Based on the putative mechanisms of antipsychotics and evidence of disrupted connectivity in schizophrenia, we hypothesised that functional network connectivity, as assessed using network-based statistics, would exhibit differences between treatment response subtypes of schizophrenia and healthy controls...
October 14, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/29036668/neurobiological-commonalities-and-distinctions-among-three-major-psychiatric-diagnostic-categories-a-structural-mri-study
#12
Miao Chang, Fay Y Womer, E Kale Edmiston, Chuan Bai, Qian Zhou, Xiaowei Jiang, Shengnan Wei, Yange Wei, Yuting Ye, Haiyan Huang, Yong He, Ke Xu, Yanqing Tang, Fei Wang
BACKGROUND: Schizophrenia (SZ), bipolar disorder (BD), and major depressive disorder (MDD) are distinct diagnostic categories in current psychiatric nosology, yet there is increasing evidence for shared clinical and biological features in these disorders. No previous studies have examined brain structural features concurrently in these 3 disorders. The aim of this study was to identify the extent of shared and distinct brain alterations in SZ, BD, and MDD. We examined gray matter (GM) volume and white matter (WM) integrity in a total of 485 individuals (135 with SZ, 86 with BD, 108 with MDD, and 156 healthy controls [HC]) who underwent high-resolution structural magnetic resonance imaging (MRI) and diffusion tensor imaging (DTI) at a single site...
June 13, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/29036371/additive-effect-of-cigarette-smoking-on-gray-matter-abnormalities-in-schizophrenia
#13
Naoto Yokoyama, Hitoshi Sasaki, Yasuo Mori, Miki Ono, Kousuke Tsurumi, Ryosaku Kawada, Yukiko Matsumoto, Yujiro Yoshihara, Genichi Sugihara, Jun Miyata, Toshiya Murai, Hidehiko Takahashi
It is widely known that there is a high prevalence of cigarette smoking in schizophrenia. One of the explanations is the self-medication hypothesis. Based on this hypothesis, it has been suggested that nicotine has procognitive effect or even neuroprotective effect in schizophrenia. However, cigarettes contain numerous neurotoxic substances, making the net effect of cigarette smoking on brain function and structure complex. Indeed, recent studies have called into question the self-medication hypothesis. We aimed to test whether there is an interaction between diagnosis and smoking status in gray matter volume, ie, whether smoking has specific effects on gray matter or whether main effects of these 2 variables additively affect common brain regions...
July 14, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/29024679/short-range-connections-in-the-developmental-connectome-during-typical-and-atypical-brain-maturation
#14
REVIEW
Minhui Ouyang, Huiying Kang, John A Detre, Timothy P L Roberts, Hao Huang
The human brain is remarkably complex with connectivity constituting its basic organizing principle. Although long-range connectivity has been focused on in most research, short-range connectivity is characterized by unique and spatiotemporally heterogeneous dynamics from infancy to adulthood. Alterations in the maturational dynamics of short-range connectivity has been associated with neuropsychiatric disorders, such as autism and schizophrenia. Recent advances in neuroimaging techniques, especially diffusion magnetic resonance imaging (dMRI), resting-state functional MRI (rs-fMRI), electroencephalography (EEG) and magnetoencephalography (MEG), have made quantification of short-range connectivity possible in pediatric populations...
October 9, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28982554/the-genetics-of-endophenotypes-of-neurofunction-to-understand-schizophrenia-genus-consortium-a-collaborative-cognitive-and-neuroimaging-genetics-project
#15
Gabriëlla A M Blokland, Elisabetta C Del Re, Raquelle I Mesholam-Gately, Jorge Jovicich, Joey W Trampush, Matcheri S Keshavan, Lynn E DeLisi, James T R Walters, Jessica A Turner, Anil K Malhotra, Todd Lencz, Martha E Shenton, Aristotle N Voineskos, Dan Rujescu, Ina Giegling, René S Kahn, Joshua L Roffman, Daphne J Holt, Stefan Ehrlich, Zora Kikinis, Paola Dazzan, Robin M Murray, Marta Di Forti, Jimmy Lee, Kang Sim, Max Lam, Rick P F Wolthusen, Sonja M C de Zwarte, Esther Walton, Donna Cosgrove, Sinead Kelly, Nasim Maleki, Lisa Osiecki, Marco M Picchioni, Elvira Bramon, Manuela Russo, Anthony S David, Valeria Mondelli, Antje A T S Reinders, M Aurora Falcone, Annette M Hartmann, Bettina Konte, Derek W Morris, Michael Gill, Aiden P Corvin, Wiepke Cahn, New Fei Ho, Jian Jun Liu, Richard S E Keefe, Randy L Gollub, Dara S Manoach, Vince D Calhoun, S Charles Schulz, Scott R Sponheim, Donald C Goff, Stephen L Buka, Sara Cherkerzian, Heidi W Thermenos, Marek Kubicki, Paul G Nestor, Erin W Dickie, Evangelos Vassos, Simone Ciufolini, Tiago Reis Marques, Nicolas A Crossley, Shaun M Purcell, Jordan W Smoller, Neeltje E M van Haren, Timothea Toulopoulou, Gary Donohoe, Jill M Goldstein, Larry J Seidman, Robert W McCarley, Tracey L Petryshen
BACKGROUND: Schizophrenia has a large genetic component, and the pathways from genes to illness manifestation are beginning to be identified. The Genetics of Endophenotypes of Neurofunction to Understand Schizophrenia (GENUS) Consortium aims to clarify the role of genetic variation in brain abnormalities underlying schizophrenia. This article describes the GENUS Consortium sample collection. METHODS: We identified existing samples collected for schizophrenia studies consisting of patients, controls, and/or individuals at familial high-risk (FHR) for schizophrenia...
October 3, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28974405/structural-anomalies-of-the-peripheral-olfactory-system-in-psychosis-high-risk-subjects
#16
Bruce I Turetsky, Paul J Moberg, Megan Quarmley, Erich Dress, Monica E Calkins, Kosha Ruparel, Karthik Prabhakaran, Raquel E Gur, David R Roalf
BACKGROUND: Olfactory impairments are prominent in both schizophrenia and the preceding at-risk state. Their presence prior to illness predicts poor functional outcome. In schizophrenia, these impairments reflect peripheral olfactory structural abnormalities, which are hypothesized to arise during early embryonic development. If this is correct, then similar structural anomalies should be apparent among clinical high-risk subjects. METHODS: Thirty-nine clinical high-risk (CR) subjects (24M/15F) were compared to 36 low-risk (LR) subjects (19M/17F)...
September 30, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28946750/age-related-changes-in-topological-degradation-of-white-matter-networks-and-gene-expression-in-chronic-schizophrenia
#17
Fon Powell, Eve LoCastro, Diana Acosta, Mohamed Ahmed, Stefani O'Donoghue, Natalie Forde, Dara Cannon, Cathy Scanlon, Tushar Rao, Colm McDonald, Ashish Raj
Current hypotheses stipulate core symptoms of schizophrenia (SZ) result from the brain's incapacity to integrate neural processes. Converging diffusion magnetic resonance imaging and graph theory studies provide evidence of macrostructural alterations in SZ. However, age-related topological changes within and between white matter (WM) networks and its relationship to gene expression with disease progression remain incompletely understood. This cross-sectional study uses network modeling to investigate changes in WM network organization with disease progression in chronic SZ as well its relationship with gene expression in healthy brains...
November 2017: Brain Connectivity
https://www.readbyqxmd.com/read/28945119/reduced-structural-connectivity-in-frontostriatal-white-matter-tracts-in-the-associative-loop-in-schizophrenia
#18
James J Levitt, Paul G Nestor, Laura Levin, Paula Pelavin, Pan Lin, Marek Kubicki, Robert W McCarley, Martha E Shenton, Yogesh Rathi
OBJECTIVE: The striatum receives segregated and integrative white matter tracts from the cortex facilitating information processing in the cortico-basal ganglia network. The authors examined both types of input tracts in the striatal associative loop in chronic schizophrenia patients and healthy control subjects. METHOD: Structural and diffusion MRI scans were acquired on a 3-T system from 26 chronic schizophrenia patients and 26 matched healthy control subjects...
November 1, 2017: American Journal of Psychiatry
https://www.readbyqxmd.com/read/28943848/multimodal-discrimination-of-schizophrenia-using-hybrid-weighted-feature-concatenation-of-brain-functional-connectivity-and-anatomical-features-with-an-extreme-learning-machine
#19
Muhammad Naveed Iqbal Qureshi, Jooyoung Oh, Dongrae Cho, Hang Joon Jo, Boreom Lee
Multimodal features of structural and functional magnetic resonance imaging (MRI) of the human brain can assist in the diagnosis of schizophrenia. We performed a classification study on age, sex, and handedness-matched subjects. The dataset we used is publicly available from the Center for Biomedical Research Excellence (COBRE) and it consists of two groups: patients with schizophrenia and healthy controls. We performed an independent component analysis and calculated global averaged functional connectivity-based features from the resting-state functional MRI data for all the cortical and subcortical anatomical parcellation...
2017: Frontiers in Neuroinformatics
https://www.readbyqxmd.com/read/28933314/effectiveness-of-a-low-support-remotely-accessible-cognitive-remediation-training-programme-for-chronic-psychosis-cognitive-functional-and-cortical-outcomes-from-a-single-blind-randomised-controlled-trial
#20
G Donohoe, R Dillon, A Hargreaves, O Mothersill, M Castorina, E Furey, A J Fagan, J F Meaney, B Fitzmaurice, B Hallahan, C McDonald, T Wykes, A Corvin, I H Robertson
BACKGROUND: Cognitive remediation (CR) training has emerged as a promising approach to improving cognitive deficits in schizophrenia and related psychosis. The limited availability of psychological services for psychosis is a major barrier to accessing this intervention however. This study investigated the effectiveness of a low support, remotely accessible, computerised working memory (WM) training programme in patients with psychosis. METHODS: Ninety patients were enrolled into a single blind randomised controlled trial of CR...
September 21, 2017: Psychological Medicine
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