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Cognitive impairment associated with schizophrenia

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https://www.readbyqxmd.com/read/28434616/impaired-tuning-of-neural-ensembles-and-the-pathophysiology-of-schizophrenia-a-translational-and-computational-neuroscience-perspective
#1
REVIEW
John H Krystal, Alan Anticevic, Genevieve J Yang, George Dragoi, Naomi R Driesen, Xiao-Jing Wang, John D Murray
The functional optimization of neural ensembles is central to human higher cognitive functions. When the functions through which neural activity is tuned fail to develop or break down, symptoms and cognitive impairments arise. This review considers ways in which disturbances in the balance of excitation and inhibition might develop and be expressed in cortical networks in association with schizophrenia. This presentation is framed within a developmental perspective that begins with disturbances in glutamate synaptic development in utero...
May 15, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/28416092/cytokines-and-c-reactive-protein-alterations-with-respect-to-cognitive-impairment-in-schizophrenia-and-bipolar-disorder-a-systematic-review
#2
REVIEW
Błażej Misiak, Bartłomiej Stańczykiewicz, Kamila Kotowicz, Janusz K Rybakowski, Jerzy Samochowiec, Dorota Frydecka
BACKGROUND: The aim of this article was to perform a systematic review of studies investigating the association between peripheral levels of cytokines and C-reactive protein (CRP), cytokine gene polymorphisms and cognition in patients with schizophrenia and bipolar disorder (BD). METHODS: The following databases: PubMed, CINAHL Complete, Academic Search Complete, ERIC and Health Source: Nursing/Academic Edition databases were searched according to the PRISMA guidelines...
April 13, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28411272/disconnection-of-the-perirhinal-and-postrhinal-cortices-impairs-recognition-of-objects-in-context-but-not-contextual-fear-conditioning
#3
Victoria R Heimer-McGinn, D L Poeta, K Aghi, M Udawatta, R D Burwell
The perirhinal cortex (PER) is known to process object information, whereas the rodent postrhinal cortex (POR), homolog to the parahippocampal cortex (PHC) in primates, is thought to process spatial information. A number of studies, however, provide evidence that both areas are involved in processing contextual information. In this study, we tested the hypothesis that the rat POR relies on object information received from the PER to form complex representations of context. Using three fear conditioning paradigms (signaled, unsignaled, and renewal) and two context-guided object recognition tasks (with 3-dimensional and 2-dimensional objects), we examined the effects of crossed excitotoxic lesions to the POR and the contralateral PER...
April 14, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28410269/social-isolation-induces-schizophrenia-like-behavior-potentially-associated-with-hint1-nmda-receptor-1-and-dopamine-receptor-2
#4
Bai-Jia Li, Peng Liu, Zheng Chu, Ying Shang, Meng-Xi Huan, Yong-Hui Dang, Cheng-Ge Gao
Both genetic factors and early life adversity play major roles in the etiology of schizophrenia. Our previous studies indicated that social isolation (SI) during early postnatal development leads to several lasting abnormal behavioral and pathophysiological features resembling the core symptoms of some human neuropsychiatric disorders in mice. The glutamate and dopamine hypotheses are tightly linked to the development of schizophrenia. The cross-talk between glutamate N-methyl-D-aspartate acid receptors and dopamine receptors is associated with histidine triad nucleotide binding protein 1 (HINT1), which is correlated with diverse psychiatric disorders...
May 24, 2017: Neuroreport
https://www.readbyqxmd.com/read/28405888/effects-of-common-grm5-genetic-variants-on-cognition-hippocampal-volume-and-mglur5-protein-levels-in-schizophrenia
#5
Natalie Matosin, Kelly Anne Newell, Yann Quidé, Jessica Lee Andrews, Nina Teroganova, Melissa Jayne Green, Francesca Fernandez
GRM5 (coding for metabotropic glutamate receptor 5, mGluR5) is a promising target for the treatment of cognitive deficits in schizophrenia, but there has been little investigation of its association with cognitive and brain phenotypes within this disorder. We examined the effects of common genetic variation in GRM5 with cognitive function, hippocampal volume, and hippocampal mGluR5 protein levels in schizophrenia patients relative to healthy controls. Two independent GRM5 variants rs60954128 [C>T] and rs3824927 [G>T] were genotyped in a schizophrenia case/control cohort (n=249/261)...
April 13, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28402427/bdnf-overexpression-prevents-cognitive-deficit-elicited-by-adolescent-cannabis-exposure-and-host-susceptibility-interaction
#6
Hadar Segal-Gavish, Neta Gazit, Yael Barhum, Tali Ben-Zur, Michal Taler, Shay Henry Hornfeld, Irit Gil-Ad, Abraham Weizman, Inna Slutsky, Minae Niwa, Atsushi Kamiya, Akira Sawa, Daniel Offen, Ran Barzilay
Cannabis abuse in adolescence is associated with increased risk of psychotic disorders. Δ-9-tetrahydrocannabinol (THC) is the primary psychoactive component of cannabis. Disrupted-In-Schizophrenia-1 (DISC1) protein is a driver for major mental illness by influencing neurodevelopmental processes. Here, utilizing a unique mouse model based on host (DISC1) X environment (THC administration) interaction, we aimed at studying the pathobiological basis through which THC exposure elicits psychiatric manifestations...
April 11, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28399842/deficits-of-perceived-spatial-separation-induced-prepulse-inhibition-in-patients-with-schizophrenia-relationships-to-symptoms-and-neurocognition
#7
Ning-Bo Yang, Qing Tian, Yu Fan, Qi-Jing Bo, Liang Zhang, Liang Li, Chuan-Yue Wang
BACKGROUND: Prepulse inhibition (PPI) and attention were impaired, which may cause psychotic symptoms and (or) hinder the cognitive functions in schizophrenia. However, due to the measurement methods of PPI, findings about the relationship between PPI and clinical symptoms, cognitive performances have been equivocal. METHODS: Seventy-five schizophrenia patients (SZ) and 50 healthy controls (HC) were assessed in a modified acoustic PPI paradigm, named perceived spatial separation-induced PPI (PSS-PPI), compared to perceived spatial co-location PPI (PSC-PPI) with inter-stimulus interval (ISI) of 120 ms...
April 11, 2017: BMC Psychiatry
https://www.readbyqxmd.com/read/28393745/correlation-of-reduced-social-communicational-and-interactional-skills-with-regional-grey-matter-volumes-in-schizophrenia-patients
#8
Miho Ota, Junko Matsuo, Noriko Sato, Toshiya Teraishi, Hiroaki Hori, Kotaro Hattori, Yoko Kamio, Hiroshi Kunugi
OBJECTIVE: Recent studies have detected similarities between autism spectrum disorder and schizophrenia. We investigated structural abnormalities associated with autistic-like traits in patients with schizophrenia by voxel-based morphometry. METHODS: Patients with schizophrenia and healthy subjects were evaluated by the adult version of the social responsiveness scale (SRS-A), which is sensitive to autistic traits and symptoms even under subthreshold conditions, and magnetic resonance imaging...
April 10, 2017: Acta Neuropsychiatrica
https://www.readbyqxmd.com/read/28392471/expression-of-mutant-disc1-in-purkinje-cells-increases-their-spontaneous-activity-and-impairs-cognitive-and-social-behaviors-in-mice
#9
Alexey V Shevelkin, Chantelle E Terrillion, Bagrat N Abazyan, Tymoteusz J Kajstura, Yan A Jouroukhin, Gay L Rudow, Juan C Troncoso, David J Linden, Mikhail V Pletnikov
In addition to motor function, the cerebellum has been implicated in cognitive and social behaviors. Various structural and functional abnormalities of Purkinje cells (PCs) have been observed in schizophrenia and autism. As PCs express the gene Disrupted-In-Schizophrenia-1 (DISC1), and DISC1 variants have been associated with neurodevelopmental disorders, we evaluated the role of DISC1 in cerebellar physiology and associated behaviors using a mouse model of inducible and selective expression of a dominant-negative, C-terminus truncated human DISC1 (mutant DISC1) in PCs...
April 6, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28383650/schizotypy-independent-and-schizotypy-modulated-cognitive-impairments-in-unaffected-first-degree-relatives-of-schizophrenia-spectrum-patients
#10
Chrysoula Zouraraki, Penny Karamaouna, Leda Karagiannopoulou, Stella G Giakoumaki
Objective: The aim of the study was to compare the neurocognitive profile of unaffected first-degree relatives of schizophrenia patients with control individuals, controlling for different schizotypal traits. Method: One hundred and fifteen adult unaffected first-degree relatives of schizophrenia-spectrum patients and 122 controls were tested for schizotypy with the Schizotypal Personality Questionnaire. They also underwent a thorough neurocognitive assessment with a range of tasks covering several aspects of executive functioning...
April 5, 2017: Archives of Clinical Neuropsychology: the Official Journal of the National Academy of Neuropsychologists
https://www.readbyqxmd.com/read/28380108/the-relationship-between-moderate-to-vigorous-physical-activity-and-executive-function-among-individuals-with-schizophrenia-differences-by-illness-duration
#11
Viviane Grassmann, Mehala Subramaniapillai, Mark Duncan, Kelly Arbour-Nicitopoulos, Guy E Faulkner
Objective: Schizophrenia is a chronic mental illness characterized by positive and negative symptoms. Cognitive impairment continues to be a core and consistent deficit. Previous studies have shown that physical activity (PA) is positively associated with cognitive performance. Thus, it may play a supportive role in mitigating cognitive impairments among individuals with schizophrenia. The aim of this study was to analyze the relationship between moderate-to-vigorous physical activity (MVPA) and executive function among adults with schizophrenia...
March 30, 2017: Revista Brasileira de Psiquiatria
https://www.readbyqxmd.com/read/28373127/rp5063-an-atypical-antipsychotic-drug-with-a-unique-pharmacologic-profile-improves-declarative-memory-and-psychosis-in-mouse-models-of-schizophrenia
#12
Lakshmi Rajagopal, Sunoh Kwon, Mei Huang, Eric Michael, Laxminarayan Bhat, Marc Cantillon, Herbert Y Meltzer
Various types of atypical antipsychotic drugs (AAPDs) modestly improve the cognitive impairment associated with schizophrenia (CIAS). RP5063 is an AAPD with a diverse and unique pharmacology, including partial agonism at dopamine (DA) D2, D3, D4, serotonin (5-HT)1A, and 5-HT2A receptors (Rs), full agonism at α4β2 nicotinic acetylcholine (ACh)R (nAChR), and antagonism at 5-HT2B, 5-HT6, and 5-HT7Rs. Most atypical APDs are 5-HT2A inverse agonists. The efficacy of RP5063 in mouse models of psychosis and episodic memory were studied...
March 31, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28370310/pharmacotherapy-effectiveness-for-clinical-subgroups-among-children-and-adolescents-with-early-onset-schizophrenia
#13
Jeanette M Jerrell, Roger S McIntyre, Chelsea B Deroche
OBJECTIVE: This study aims to determine the effectiveness of pharmacotherapies among children and adolescents diagnosed with early onset schizophrenia subgrouped according to their co-occurring psychiatric disorders. METHODS: A retrospective cohort design was employed, using South Carolina's (USA) Medicaid claims dataset covering outpatient and inpatient medical services, between January, 1999 and December, 2013 to identify patients ≤17 years of age. Random effects regression analyses assessed differential changes in acute psychiatric service utilization over time across the 3 subgroups associated with antipsychotic, mood stabilizer, psychostimulant, or antidepressant pharmacotherapy...
March 2017: Human Psychopharmacology
https://www.readbyqxmd.com/read/28369611/attacking-heterogeneity-in-schizophrenia-by-deriving-clinical-subgroups-from-widely-available-symptom-data
#14
Dwight Dickinson, Danielle N Pratt, Evan J Giangrande, MeiLin Grunnagle, Jennifer Orel, Daniel R Weinberger, Joseph H Callicott, Karen F Berman
Previous research has identified (1) a "deficit" subtype of schizophrenia characterized by enduring negative symptoms and diminished emotionality and (2) a "distress" subtype associated with high emotionality-including anxiety, depression, and stress sensitivity. Individuals in deficit and distress categories differ sharply in development, clinical course and behavior, and show distinct biological markers, perhaps signaling different etiologies. We tested whether deficit and distress subtypes would emerge from a simple but novel data-driven subgrouping analysis, based on Positive and Negative Syndrome Scale (PANSS) negative and distress symptom dimensions, and whether subgrouping was informative regarding other facets of behavior and brain function...
March 20, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/28368180/predictors-of-response-to-cognitive-remediation-in-service-recipients-with-severe-mental-illness
#15
Jean-Pierre Lindenmayer, Veronica Anna Ozog, Anzalee Khan, Isidora Ljuri, Samantha Fregenti, Susan R McGurk
OBJECTIVE: Cognitive challenges are prominent features of individuals diagnosed with schizophrenia, impairing occupational, social, and economic functioning. These challenges are predictive of social and work outcomes. Cognitive remediation has been shown to be effective in improving both cognitive and social functions. However, cognitive remediation does not produce improvement in all participants. We investigated demographic, neurocognitive, and psychopathological predictors associated with improvement following cognitive remediation interventions in service recipients with severe mental illnesses...
March 2017: Psychiatric Rehabilitation Journal
https://www.readbyqxmd.com/read/28368179/supplementing-intensive-targeted-computerized-cognitive-training-with-social-cognitive-exercises-for-people-with-schizophrenia-an-interim-report
#16
Melissa Fisher, Mor Nahum, Elizabeth Howard, Abby Rowlands, Benjamin Brandrett, Amy Kermott, Joshua Woolley, Sophia Vinogradov
OBJECTIVE: Individuals with schizophrenia demonstrate cognitive, social cognitive, and motivational deficits that contribute to impairment in real-world functioning. In the current study, we investigated the effects of supplementing computerized neurocognitive training with social cognitive exercises, as compared with neurocognitive training alone. METHOD: In this ongoing, double-blind, randomized controlled trial of 111 participants with psychosis, we compare the effects of supplementing intensive targeted cognitive training with social cognitive training exercises (TCT + SCT) with the effects of targeted cognitive training alone (TCT-only)...
March 2017: Psychiatric Rehabilitation Journal
https://www.readbyqxmd.com/read/28358303/a-novel-bio-psychosocial-behavioral-treatment-model-in-schizophrenia
#17
REVIEW
Yong-Ku Kim, Joonho Choi, Seon-Cheol Park
Despite the substantial burden of illness in schizophrenia, there has been a discrepancy between the beneficial effects of an increased use of antipsychotic medications and achieving limited recovery or remission. Because the focus of the most common antipsychotic medications is on dopamine, which is associated with positive symptoms, there is an unmet need for patients with negative symptoms. Since cognitive and negative symptoms rather than positive symptoms are more closely associated with psychosocial impairments in patients with schizophrenia, the non-dopaminergic systems including glutamate and γ-aminobutyric acid (GABA) of the prefrontal cortex should be of concern as well...
March 30, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28349247/benzodiazepine-long-term-administration-is-associated-with-impaired-attention-working-memory-in-schizophrenia-results-from-the-national-multicentre-face-sz-data-set
#18
Guillaume Fond, F Berna, L Boyer, O Godin, L Brunel, M Andrianarisoa, B Aouizerate, D Capdevielle, I Chereau, J M Danion, C Dubertret, J Dubreucq, C Faget, F Gabayet, T Le Gloahec, P M Llorca, J Mallet, D Misdrahi, R Rey, R Richieri, C Passerieux, C Portalier, P Roux, A Vehier, H Yazbek, F Schürhoff, E Bulzacka
OBJECTIVE: The effect of benzodiazepine long-term administration (BLTA) in cognitive functioning of subjects with schizophrenia (SZ) has been partially explored to date. The objective was to assess BLTA-associated cognitive impairment with a comprehensive cognitive battery in a non-selected multicentric/national community-dwelling sample of stabilized SZ subjects. METHOD: 407 community-dwelling stabilized SZ subjects were consecutively included in the FondaMental Academic Centers of Expertise for Schizophrenia Cohort (FACE-SZ)...
March 27, 2017: European Archives of Psychiatry and Clinical Neuroscience
https://www.readbyqxmd.com/read/28348889/cortical-thinning-in-network-associated-regions-in-cognitively-normal-and-below-normal-range-schizophrenia
#19
R Walter Heinrichs, Farena Pinnock, Melissa Parlar, Colin Hawco, Lindsay Hanford, Geoffrey B Hall
This study assessed whether cortical thickness across the brain and regionally in terms of the default mode, salience, and central executive networks differentiates schizophrenia patients and healthy controls with normal range or below-normal range cognitive performance. Cognitive normality was defined using the MATRICS Consensus Cognitive Battery (MCCB) composite score (T = 50 ± 10) and structural magnetic resonance imaging was used to generate cortical thickness data. Whole brain analysis revealed that cognitively normal range controls (n = 39) had greater cortical thickness than both cognitively normal (n = 17) and below-normal range (n = 49) patients...
2017: Schizophrenia Research and Treatment
https://www.readbyqxmd.com/read/28347261/dopamine-d4-receptor-stimulation-contributes-to-novel-object-recognition-relevance-to-cognitive-impairment-in-schizophrenia
#20
Masanori Miyauchi, Nichole M Neugebauer, Herbert Y Meltzer
Several atypical antipsychotic drugs (APDs) have high affinity for the dopamine (DA) D4 receptor, but the relevance to the efficacy for the treatment of cognitive impairment associated with schizophrenia (CIAS) is poorly understood. The aim of this study was to investigate the effects of D4 receptor stimulation or blockade on novel object recognition (NOR) in normal rats and on the sub-chronic phencyclidine (PCP)-induced novel object recognition deficit. The effect of the D4 agonist, PD168077, and the D4 antagonist, L-745,870, were studied alone, and in combination with clozapine and lurasidone...
April 2017: Journal of Psychopharmacology
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