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https://www.readbyqxmd.com/read/28107346/decreased-functional-connectivity-of-insular-cortex-in-drug-na%C3%A3-ve-first-episode-schizophrenia-in-relation-to-symptom-severity
#1
Lijuan Pang, David Kennedy, Qinling Wei, Luxian Lv, Jinsong Gao, Hong Li, Meina Quan, Xue Li, Yongfeng Yang, Xiaoduo Fan, Xueqin Song
BACKGROUND: This study was to examine the insular cortical functional connectivity in drug naïve patients with first episode schizophrenia and to explore the relationship between the connectivity and the severity of clinical symptoms. METHODS: Thirty-seven drug naïve patients with schizophrenia and 25 healthy controls were enrolled in this study. A seed-based approach was used to analyze the resting-state functional imaging data. Insular cortical connectivity maps were bilaterally extracted for group comparison and validated by voxel-based morphometry (VBM) analysis...
2017: PloS One
https://www.readbyqxmd.com/read/28104737/cerebral-blood-flow-alterations-specific-to-auditory-verbal-hallucinations-in-schizophrenia
#2
Chuanjun Zhuo, Jiajia Zhu, Wen Qin, Hongru Qu, Xiaolei Ma, Chunshui Yu
BACKGROUND: Auditory verbal hallucinations (AVHs) have been associated with deficits in auditory and speech-related networks. However, the resting-state cerebral blood flow (CBF) alterations specific to AVHs in schizophrenia remain unknown. AIMS: To explore AVH-related CBF alterations in individuals with schizophrenia. METHOD: In total, 35 individuals with schizophrenia with AVHs, 41 individuals with schizophrenia without AVHs and 50 controls underwent arterial spin labelling magnetic resonance imaging...
January 19, 2017: British Journal of Psychiatry: the Journal of Mental Science
https://www.readbyqxmd.com/read/28104410/the-drd2-rs1076560-polymorphism-and-schizophrenia-related-intermediate-phenotypes-a-systematic-review-and-meta-analysis
#3
REVIEW
Jurjen J Luykx, Juliette L Broersen, Max de Leeuw
Intermediate phenotypes may contribute to elucidate the genetic determinants of schizophrenia. A regulatory dopamine 2-receptor gene (DRD2) polymorphism (rs1076560; G > T) has been identified as a genetic risk factor for schizophrenia. Studies report conflicting results on its involvement in schizophrenia intermediate phenotypes and no systematic review on this topic has been published. Therefore, we aimed to assess whether this polymorphism is implicated in schizophrenia intermediate phenotypes by performing a systematic review and meta-analysis...
January 16, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28102528/alteration-of-gray-matter-microstructure-in-schizophrenia
#4
Seitz Johanna, Rathi Yogesh, Lyall Amanda, Pasternak Ofer, Del Re Elisabetta C, Niznikiewicz Margaret, Nestor Paul, J Seidman Larry, L Petryshen Tracey, I Mesholam-Gately Raquelle, Wojcik Joanne, W McCarley Robert, E Shenton Martha, K Koerte Inga, Kubicki Marek
Neuroimaging studies demonstrate gray matter (GM) macrostructural abnormalities in patients with schizophrenia (SCZ). While ex-vivo and genetic studies suggest cellular pathology associated with abnormal neurodevelopmental processes in SCZ, few in-vivo measures have been proposed to target microstructural GM organization. Here, we use diffusion heterogeneity- to study GM microstructure in SCZ. Structural and diffusion magnetic resonance imaging (MRI) were acquired on a 3 Tesla scanner in 46 patients with SCZ and 37 matched healthy controls (HC)...
January 19, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28097738/enhanced-predictive-signalling-in-schizophrenia
#5
Katharina Schmack, Marcus Rothkirch, Josef Priller, Philipp Sterzer
Positive symptoms of schizophrenia such as delusions and hallucinations are thought to arise from an alteration in predictive mechanisms of the brain. Here, we empirically tested the hypothesis that schizophrenia is associated with an enhanced signalling of higher-level predictions that shape perception into conformity with acquired beliefs. Twenty-one patients with schizophrenia and twenty-eight healthy controls matched for age and gender took part in a functional magnetic resonance imaging (fMRI) experiment that assessed the effect of an experimental manipulation of cognitive beliefs on the perception of an ambiguous visual motion stimulus...
January 18, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28094815/drd2-co-expression-network-and-a-related-polygenic-index-predict-imaging-behavioral-and-clinical-phenotypes-linked-to-schizophrenia
#6
G Pergola, P Di Carlo, E D'Ambrosio, B Gelao, L Fazio, M Papalino, A Monda, G Scozia, B Pietrangelo, M Attrotto, J A Apud, Q Chen, V S Mattay, A Rampino, G Caforio, D R Weinberger, G Blasi, A Bertolino
Genetic risk for schizophrenia (SCZ) is determined by many genetic loci whose compound biological effects are difficult to determine. We hypothesized that co-expression pathways of SCZ risk genes are associated with system-level brain function and clinical phenotypes of SCZ. We examined genetic variants related to the dopamine D2 receptor gene DRD2 co-expression pathway and associated them with working memory (WM) behavior, the related brain activity and treatment response. Using two independent post-mortem prefrontal messenger RNA (mRNA) data sets (total N=249), we identified a DRD2 co-expression pathway enriched for SCZ risk genes...
January 17, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28094812/putative-presynaptic-dopamine-dysregulation-in-schizophrenia-is-supported-by-molecular-evidence-from-post-mortem-human-midbrain
#7
T D Purves-Tyson, S J Owens, D A Rothmond, G M Halliday, K L Double, J Stevens, T McCrossin, C Shannon Weickert
The dopamine hypothesis of schizophrenia posits that increased subcortical dopamine underpins psychosis. In vivo imaging studies indicate an increased presynaptic dopamine synthesis capacity in striatal terminals and cell bodies in the midbrain in schizophrenia; however, measures of the dopamine-synthesising enzyme, tyrosine hydroxylase (TH), have not identified consistent changes. We hypothesise that dopamine dysregulation in schizophrenia could result from changes in expression of dopamine synthesis enzymes, receptors, transporters or catabolic enzymes...
January 17, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28093569/translational-evaluation-of-translocator-protein-as-a-marker-of-neuroinflammation-in-schizophrenia
#8
T Notter, J M Coughlin, T Gschwind, U Weber-Stadlbauer, Y Wang, M Kassiou, A C Vernon, D Benke, M G Pomper, A Sawa, U Meyer
Positron emission tomography (PET) imaging with radiotracers that target translocator protein 18 kDa (TSPO) has become a popular approach to assess putative neuroinflammatory processes and associated microglia activation in psychotic illnesses. It remains unclear, however, whether TSPO imaging can accurately capture low-grade inflammatory processes such as those present in schizophrenia and related disorders. Therefore, we evaluated the validity of TSPO as a disease-relevant marker of inflammation using a translational approach, which combined neurodevelopmental and neurodegenerative mouse models with PET imaging in patients with recent-onset schizophrenia and matched controls...
January 17, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28093278/similar-patterns-of-brain-activation-abnormalities-during-emotional-and-non-emotional-judgments-of-faces-in-a-schizophrenia-family-study
#9
Michael J Spilka, Vina M Goghari
Schizophrenia patients have impaired performance and abnormal brain activation during facial emotion recognition, which may represent a marker of genetic liability to schizophrenia. However, it remains unclear whether the impairment is specific to recognizing emotion from faces or is instead attributable to more generalized dysfunction. The current study aimed to distinguish between specific and generalized neural dysfunction underlying impaired facial emotion recognition in schizophrenia and examine associations with genetic liability...
January 13, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28079061/progressive-decline-in-hippocampal-ca1-volume-in-individuals-at-ultra-high-risk-for-psychosis-who-do-not-remit-findings-from-the-longitudinal-youth-at-risk-study
#10
New Fei Ho, Daphne J Holt, Mike Cheung, Juan Eugenio Iglesias, Alex Goh, Mingyuan Wang, Joseph Kw Lim, Joshua de Souza, Joann S Poh, Yuen Mei See, Alison R Adcock, Stephen J Wood, Michael Wl Chee, Jimmy Lee, Juan Zhou
Most individuals identified as ultra high-risk for psychosis (UHR) do not develop frank psychosis. They continue to exhibit subthreshold symptoms, or go on to fully remit. Prior work has shown that the volume of CA1, a subfield of the hippocampus, is selectively reduced in the early stages of schizophrenia. Here, we aimed to determine whether patterns of volume change of CA1 are different in UHR individuals who do or do not achieve symptomatic remission. Structural MRI scans were acquired at baseline and at 1-2 follow-up time points (at 12-month intervals) from 147 UHR and healthy control subjects...
January 12, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28076640/frontal-lobe-alterations-in-schizophrenia-a-review
#11
Ateeq Mubarik, Hassaan Tohid
Objective: To highlight the changes in the frontal lobe of the human brain in people with schizophrenia. Methods: This was a qualitative review of the literature. Results: Many schizophrenic patients exhibit functional, structural, and metabolic abnormalities in the frontal lobe. Some patients have few or no alterations, while some have more functional and structural changes than others. Magnetic resonance imaging (MRI) shows structural and functional changes in volume, gray matter, white matter, and functional activity in the frontal lobe, but the mechanisms underlying these changes are not yet fully understood...
October 2016: Trends in Psychiatry and Psychotherapy
https://www.readbyqxmd.com/read/28073491/gray-matter-neuritic-microstructure-deficits-in-schizophrenia-and-bipolar-disorder
#12
Arash Nazeri, Benoit H Mulsant, Tarek K Rajji, Melissa L Levesque, Jon Pipitone, Laura Stefanik, Saba Shahab, Tina Roostaei, Anne L Wheeler, Sofia Chavez, Aristotle N Voineskos
BACKGROUND: Postmortem studies have demonstrated considerable dendritic pathologies among persons with schizophrenia and to some extent among those with bipolar I disorder. Modeling gray matter (GM) microstructural properties is now possible with a recently proposed diffusion-weighted magnetic resonance imaging modeling technique: neurite orientation dispersion and density imaging. This technique may bridge the gap between neuroimaging and histopathological findings. METHODS: We performed an extended series of multishell diffusion-weighted imaging and other structural imaging series using 3T magnetic resonance imaging...
December 8, 2016: Biological Psychiatry
https://www.readbyqxmd.com/read/28072415/functional-neuroimaging-effects-of-recently-discovered-genetic-risk-loci-for-schizophrenia-and-polygenic-risk-profile-in-five-rdoc-subdomains
#13
S Erk, S Mohnke, S Ripke, T A Lett, I M Veer, C Wackerhagen, O Grimm, N Romanczuk-Seiferth, F Degenhardt, H Tost, M Mattheisen, T W Mühleisen, K Charlet, N Skarabis, F Kiefer, S Cichon, S H Witt, M M Nöthen, M Rietschel, A Heinz, A Meyer-Lindenberg, H Walter
Recently, 125 loci with genome-wide support for association with schizophrenia were identified. We investigated the impact of these variants and their accumulated genetic risk on brain activation in five neurocognitive domains of the Research Domain Criteria (working memory, reward processing, episodic memory, social cognition and emotion processing). In 578 healthy subjects we tested for association (i) of a polygenic risk profile score (RPS) including all single-nucleotide polymorphisms (SNPs) reaching genome-wide significance in the recent genome-wide association studies (GWAS) meta-analysis and (ii) of all independent genome-wide significant loci separately that showed sufficient distribution of all allelic groups in our sample (105 SNPs)...
January 10, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28067006/addressing-reverse-inference-in-psychiatric-neuroimaging-meta-analyses-of-task-related-brain-activation-in-common-mental-disorders
#14
Emma Sprooten, Alexander Rasgon, Morgan Goodman, Ariella Carlin, Evan Leibu, Won Hee Lee, Sophia Frangou
Functional magnetic resonance imaging (fMRI) studies in psychiatry use various tasks to identify case-control differences in the patterns of task-related brain activation. Differently activated regions are often ascribed disorder-specific functions in an attempt to link disease expression and brain function. We undertook a systematic meta-analysis of data from task-fMRI studies to examine the effect of diagnosis and study design on the spatial distribution and direction of case-control differences on brain activation...
January 9, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28062203/semi-mechanistic-computer-simulation-of-psychotic-symptoms-in-schizophrenia-with-a-model-of-a-humanized-cortico-striatal-thalamocortical-loop
#15
Athan Spiros, Patrick Roberts, Hugo Geerts
Despite new insights into the pathophysiology of schizophrenia and clinical trials with highly selective drugs, no new therapeutic breakthroughs have been identified. We present a semi-mechanistic Quantitative Systems Pharmacology (QSP) computer model of a biophysically realistic cortical-striatal-thalamo-cortical loop. The model incorporates the direct, indirect and hyperdirect pathway of the basal ganglia and CNS drug targets that modulate neuronal firing, based on preclinical data about their localization and coupling to voltage-gated ion channels...
January 3, 2017: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28049619/synthesis-and-evaluation-of-1-cyclopropylmethyl-4-4-11-c-methoxyphenyl-piperidin-1-yl-2-oxo-1-2-dihydropyridine-3-carbonitrile-11-c-cmdc-for-pet-imaging-of-metabotropic-glutamate-receptor-2-in-the-rat-brain
#16
Yufei Ma, Katsushi Kumata, Joji Yui, Yiding Zhang, Tomoteru Yamasaki, Akiko Hatori, Masayuki Fujinaga, Nobuki Nengaki, Lin Xie, Hui Wang, Ming-Rong Zhang
Brain metabotropic glutamate receptor 2 (mGluR2) has been proposed as a therapeutic target for the treatment of schizophrenia-like symptoms arising from increased glutamate transmission in the forebrain. However, there does not exist a reliable tool for the study of mGluR2 in human neuroimaging. The purpose of this study was to radiosynthesize 1-(cyclopropylmethyl)-4-(4-[(11)C]methoxyphenyl)piperidin-1-yl-2-oxo-1,2-dihydropyridine-3-carbonitrile ([(11)C]CMDC) and evaluate its potential as a positron emission tomography (PET) radiotracer for imaging mGluR2 in the rat brain...
December 23, 2016: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28047652/su-f-sps-07-magnetic-resonance-spectroscopy-findings-in-early-phase-psychosis
#17
A Wright, R Ma, T Hummer, M Francis, N Mehdiyoun, U Dydak, A Breier
PURPOSE: Schizophrenia is a psychiatric disorder characterized by disordered thoughts, abnormal social behaviors, flat affect, and auditory or visual hallucinations. The current study aims to investigate alterations in brain metabolism in patients near the onset of psychosis (early-phase psychosis, EPP), to characterize abnormalities during the early stages of schizophrenia. To this end, we used magnetic resonance imaging (MRI) and spectroscopy (MRS) to measure metabolite levels and subsequently monitor the effect of treatment with N-acetylcysteine (NAC)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28032370/modular-level-alterations-of-structure-function-coupling-in-schizophrenia-connectome
#18
Yu Sun, Zhongxiang Dai, Junhua Li, Simon L Collinson, Kang Sim
Convergent evidences have revealed that schizophrenia is associated with brain dysconnectivity, which leads to abnormal network organization. However, discrepancies were apparent between the structural connectivity (SC) and functional connectivity (FC) studies, and the relationship between structural and functional deficits in schizophrenia remains largely unknown. In this study, resting-state functional magnetic resonance imaging and structural diffusion tensor imaging were performed in 20 patients with schizophrenia and 20 matched healthy volunteers (patients/controls = 19/17 after head motion rejection)...
December 29, 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/28032254/white-matter-correlates-of-the-disorganized-speech-dimension-in-schizophrenia
#19
Petra V Viher, Katharina Stegmayer, Stéphanie Giezendanner, Andrea Federspiel, Stephan Bohlhalter, Roland Wiest, Werner Strik, Sebastian Walther
Disorganized speech is related to functional abnormalities in schizophrenia. To test the association between formal thought disorders (FTDs) and white matter microstructure, we applied a behavioral rating and diffusion tensor imaging in 61 patients with schizophrenia spectrum disorders. The Bern Psychopathology Scale was used to rate the dimension of language abnormalities ranging from negative FTDs, basically unaltered speech, to positive FTDs. Tract-based spatial statistics indicated increased fractional anisotropy in left hemispheric pathways of the language system in patients with negative FTDs...
December 28, 2016: European Archives of Psychiatry and Clinical Neuroscience
https://www.readbyqxmd.com/read/28027496/allostatic-load-and-reduced-cortical-thickness-in-schizophrenia
#20
Joshua Chiappelli, Peter Kochunov, Anya Savransky, Feven Fisseha, Krista Wisner, Xiaoming Du, Laura M Rowland, L Elliot Hong
Structural imaging studies have consistently found reduced gray matter thickness of the cerebral cortex in schizophrenia, a finding that is evident in first episode psychosis and may be progressive in some cases. Although genetic predisposition and medication effects may contribute to cortical thinning, we hypothesize that the cumulative effects of stress may represent an environmental factor impacting brain morphology in schizophrenia. We examined the relationship between allostatic load, an index of peripheral biomarkers representing the cumulative effects of stress, and cortical thickness...
November 24, 2016: Psychoneuroendocrinology
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