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Schizophrenia and negative symptoms

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https://www.readbyqxmd.com/read/28340425/increased-nucleus-accumbens-volume-in-first-episode-psychosis
#1
Mireia Forns-Nadal, Daniel Bergé, Federico Sem, Anna Mané, Laura Igual, Dani Guinart, Oscar Vilarroya
Nucleus accumbens has been reported as a key structure in the neurobiology of schizophrenia. Studies analyzing structural abnormalities have shown conflicting results, possibly related to confounding factors. We investigated the nucleus accumbens volume using manual delimitation in first-episode psychosis (FEP) controlling for age, cannabis use and medication. Thirty-one FEP subjects who were naive or minimally exposed to antipsychotics and a control group were MRI scanned and clinically assessed from baseline to 6 months of follow-up...
March 18, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28337332/bms-933043-a-selective-%C3%AE-7-nachr-partial-agonist-for-the-treatment-of-cognitive-deficits-associated-with-schizophrenia
#2
Dalton King, Christiana Iwuagwu, Jim Cook, Ivar M McDonald, Robert Mate, F Christopher Zusi, Matthew D Hill, Haiquan Fang, Rulin Zhao, Bei Wang, Amy E Easton, Regina Miller, Debra Post-Munson, Ronald J Knox, Lizbeth Gallagher, Ryan Westphal, Thaddeus Molski, Jingsong Fan, Wendy Clarke, Yulia Benitex, Kimberley A Lentz, Rex Denton, Daniel Morgan, Robert Zaczek, Nicholas J Lodge, Linda J Bristow, John E Macor, Richard E Olson
The therapeutic treatment of negative symptoms and cognitive dysfunction associated with schizophrenia is a significant unmet medical need. Preclinical literature indicates that α7 neuronal nicotinic acetylcholine (nACh) receptor agonists may provide an effective approach to treating cognitive dysfunction in schizophrenia. We report herein the discovery and evaluation of 1c (BMS-933043), a novel and potent α7 nACh receptor partial agonist with high selectivity against other nicotinic acetylcholine receptor subtypes (>100-fold) and the 5-HT3A receptor (>300-fold)...
March 9, 2017: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28336195/cognitive-correlates-of-visual-neural-plasticity-in-schizophrenia
#3
Carol Jahshan, Jonathan K Wynn, Daniel H Mathalon, Michael F Green
Neuroplasticity may be an important treatment target to improve the cognitive deficits in schizophrenia (SZ). Yet, it is poorly understood and difficult to assess. Recently, a visual high-frequency stimulation (HFS) paradigm that potentiates electroencephalography (EEG)-based visual evoked potentials (VEP) has been developed to assess neural plasticity in the visual cortex. Using this paradigm, we examined visual plasticity in SZ patients (N=64) and its correlations with clinical symptoms, neurocognition, functional capacity, and community functioning...
March 20, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28334045/plasma-soluble-l-selectin-in-medicated-patients-with-schizophrenia-and-healthy-controls
#4
Satyajit Mohite, Fang Yang, Pooja A Amin, Giovana Zunta-Soares, Gabriela D Colpo, Laura Stertz, Ajaykumar N Sharma, Gabriel R Fries, Consuelo Walss-Bass, Jair C Soares, Olaoluwa O Okusaga
Immune dysfunction has been implicated in the pathophysiology of schizophrenia. Leukocyte migration to the site of inflammation is a fundamental step of immune response which involves P-, E-, and L-selectins. Elevated selectin levels have been reported in un-medicated first-episode patients with schizophrenia but not in medicated patients with multi-episode schizophrenia. We measured fasting plasma soluble P-, E-, and L-selectin in 39 medicated patients with multi-episode schizophrenia and 19 healthy controls...
2017: PloS One
https://www.readbyqxmd.com/read/28326117/impaired-social-and-role-function-in-ultra-high-risk-for-psychosis-and-first-episode-schizophrenia-its-relations-with-negative-symptoms
#5
So Jung Lee, Kyung Ran Kim, Su Young Lee, Suk Kyoon An
OBJECTIVE: Psychosocial dysfunction was a nettlesome of schizophrenia even in their prodromal phase as well as first episode and its relations with psychopathology were not determined. The aim of the present study was to examine whether the social and role function impairment was found in ultra-high risk for psychosis (UHR) individuals as well as first-episode schizophrenia patients and to explore its relations with psychopathology. METHODS: Thirty-seven normal controls, 63 UHR participants and 28 young, first-episode schizophrenia patients were recruited...
March 2017: Psychiatry Investigation
https://www.readbyqxmd.com/read/28326111/the-korean-version-of-the-schizophrenia-cognition-rating-scale-reliability-and-validity
#6
Eun-Chan Kang, Sung-Jin Kim, Young-Soo Seo, Sung-Soo Jung, Beom-Joo Seo, Jeoung-Whan Ryu, Joo-Cheol Shim, Jung-Joon Moon, Dong-Wook Jeon, Kyoung-Duck Park, Do-Un Jung
OBJECTIVE: This study's aim was to develop and standardize a Korean version (SCoRS-K) of the Schizophrenia Cognition Rating Scale (SCoRS), which is used to evaluate the degree of cognitive dysfunction affecting the everyday functioning of people with schizophrenia. METHODS: Eighty-four schizophrenia patients with stable symptoms who were receiving outpatient treatment and rehabilitation therapy, and 29 demographically matched non-patient controls, participated in the study...
March 2017: Psychiatry Investigation
https://www.readbyqxmd.com/read/28320578/specific-cerebral-perfusion-patterns-in-three-schizophrenia-symptom-dimensions
#7
Katharina Stegmayer, Werner Strik, Andrea Federspiel, Roland Wiest, Stephan Bohlhalter, Sebastian Walther
Dimensional concepts such as the Research Domain Criteria initiative have been proposed to disentangle the heterogeneity of schizophrenia. One model introduced three neurobiologically informed behavioral dimensions: language, affectivity and motor behavior. To study the brain-behavior associations of these three dimensions, we investigated whether current behavioral alterations were linked to resting state perfusion in distinct brain circuits in schizophrenia. In total, 47 patients with schizophrenia spectrum disorders and 44 healthy controls were included...
March 17, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28318835/improvement-in-mismatch-negativity-generation-during-d-serine-treatment-in-schizophrenia-correlation-with-symptoms
#8
Joshua T Kantrowitz, Michael L Epstein, Migyung Lee, Nayla Lehrfeld, Karen A Nolan, Constance Shope, Eva Petkova, Gail Silipo, Daniel C Javitt
BACKGROUND: Deficits in N-methyl-d-aspartate-type (NMDAR) function contribute to symptoms and cognitive dysfunction in schizophrenia. The efficacy of NMDAR agonists in the treatment of persistent symptoms of schizophrenia has been variable, potentially reflecting limitations in functional target engagement. We recently demonstrated significant improvement in auditory mismatch negativity (MMN) with once-weekly treatment with d-serine, a naturally occurring NMDAR glycine-site agonist. This study investigates effects of continuous (daily) NMDAR agonists in schizophrenia/schizoaffective disorder...
March 17, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28316115/gabaa-and-gabab-receptor-dysregulation-in-superior-frontal-cortex-of-subjects-with-schizophrenia-and-bipolar-disorder
#9
S Hossein Fatemi, Timothy D Folsom, Paul D Thuras
Schizophrenia and bipolar disorder are complex psychiatric disorders that affect millions of people worldwide. Evidence from gene association and postmortem studies has identified abnormalities of the gamma-aminobutyric acid (GABA) signaling system in both disorders. Abnormal GABAergic signaling and transmission could contribute to the symptomatology of these disorders, potentially through impaired gamma oscillations which normally occur during cognitive processing. In the current study, we examined the protein expression of 14 GABAA and two GABAB receptor subunits in the superior frontal cortex of subjects with schizophrenia, bipolar disorder, and healthy controls...
March 18, 2017: Synapse
https://www.readbyqxmd.com/read/28315621/scales-for-assessment-of-depression-in-schizophrenia-factor-analysis-of-calgary-depression-rating-scale-and-hamilton-depression-rating-scale
#10
Sandeep Grover, Swapnajeet Sahoo, Devakshi Dua, Subho Chakrabarti, Ajit Avasthi
This study aimed to evaluate the factor structure of Calgary depression rating scale (CDSS) and Hamilton Depression Rating Scale (HDRS) among patients with schizophrenia in acute and remission phase of illness by using exploratory factor analysis. For this, 267 patients with schizophrenia were assessed on CDSS and HDRS. Exploratory factor analysis of CDSS yielded 2 factor models for the whole sample, patients in clinical remission and patients not in clinical remission phase of schizophrenia. Factor analysis of HDRS yielded 3 factor models; however, there was significant difference in the factor structure between those in clinical remission and those not in clinical remission phase of schizophrenia...
March 9, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28315614/repetitive-transcranial-magnetic-stimulation-for-treating-the-symptoms-of-schizophrenia-a-prisma-compliant-meta-analysis
#11
Hairong He, Jun Lu, Lihong Yang, Jie Zheng, Fan Gao, Yajing Zhai, Junqin Feng, Yajuan Fan, Xiancang Ma
OBJECTIVE: To explore the efficacies of 1-Hz (low frequency) and 10-Hz (high frequency) repetitive transcranial magnetic stimulation (rTMS) in treating auditory hallucinations and negative symptoms of schizophrenia, respectively. METHODS: Electronic databases were searched to identify relevant literature. Standard mean difference (SMD) and 95% confidence interval (CI) values were used to evaluate the effects of rTMS. The stability and sensitivity of the results, the source of heterogeneity, and the recommended grade of the evidence were also analyzed...
February 22, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28314129/crack-cocaine-inhalation-induces-schizophrenia-like-symptoms-and-molecular-alterations-in-mice-prefrontal-cortex
#12
Lorena Bianchine Areal, Alice Laschuk Herlinger, Fabrício Souza Pelição, Cristina Martins-Silva, Rita Gomes Wanderley Pires
Crack cocaine (crack) addiction represents a major social and health burden, especially seeing as users are more prone to engage in criminal and violent acts. Crack users show a higher prevalence of psychiatric comorbidities - particularly antisocial personality disorders - when compared to powder cocaine users. They also develop cognitive deficits related mainly to executive functions, including working memory. It is noteworthy that stimulant drugs can induce psychotic states, which appear to mimic some symptoms of schizophrenia among users...
March 6, 2017: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/28304340/neuroinflammation-and-oxidative-stress-in-psychosis-and-psychosis-risk
#13
REVIEW
Henry Barron, Sina Hafizi, Ana C Andreazza, Romina Mizrahi
Although our understanding of psychotic disorders has advanced substantially in the past few decades, very little has changed in the standard of care for these illnesses since the development of atypical anti-psychotics in the 1990s. Here, we integrate new insights into the pathophysiology with the increasing interest in early detection and prevention. First, we explore the role of N-methyl-d-aspartate receptors in a subpopulation of cortical parvalbumin-containing interneurons (PVIs). Postmortem and preclinical data has implicated these neurons in the positive and negative symptoms, as well as the cognitive dysfunction present in schizophrenia...
March 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28295046/transcriptomic-immaturity-of-the-hippocampus-and-prefrontal-cortex-in-patients-with-alcoholism
#14
Tomoyuki Murano, Hisatsugu Koshimizu, Hideo Hagihara, Tsuyoshi Miyakawa
Alcoholism, which is defined as the recurring harmful use of alcohol despite its negative consequences, has a lifetime prevalence of 17.8%. Previous studies have shown that chronic alcohol consumption disrupts various brain functions and behaviours. However, the precise mechanisms that underlie alcoholism are currently unclear. Recently, we discovered "pseudo-immature" brain cell states of the dentate gyrus and prefrontal cortex (PFC) in mouse models of psychotic disorders and epileptic seizure. Similar pseudo-immaturity has been observed in patients with psychotic disorders, such as schizophrenia and bipolar disorder...
March 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28294459/identifying-dynamic-functional-connectivity-biomarkers-using-gig-ica-application-to-schizophrenia-schizoaffective-disorder-and-psychotic-bipolar-disorder
#15
Yuhui Du, Godfrey D Pearlson, Dongdong Lin, Jing Sui, Jiayu Chen, Mustafa Salman, Carol A Tamminga, Elena I Ivleva, John A Sweeney, Matcheri S Keshavan, Brett A Clementz, Juan Bustillo, Vince D Calhoun
Functional magnetic resonance imaging (fMRI) studies have shown altered brain dynamic functional connectivity (DFC) in mental disorders. Here, we aim to explore DFC across a spectrum of symptomatically-related disorders including bipolar disorder with psychosis (BPP), schizoaffective disorder (SAD), and schizophrenia (SZ). We introduce a group information guided independent component analysis procedure to estimate both group-level and subject-specific connectivity states from DFC. Using resting-state fMRI data of 238 healthy controls (HCs), 140 BPP, 132 SAD, and 113 SZ patients, we identified measures differentiating groups from the whole-brain DFC and traditional static functional connectivity (SFC), separately...
March 10, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28294132/5-ht2c-agonists-modulate-schizophrenia-like-behaviors-in-mice
#16
Vladimir M Pogorelov, Ramona M Rodriguiz, Jianjun Cheng, Mei Huang, Claire M Schmerberg, Herbert Y Meltzer, Bryan L Roth, Alan P Kozikowski, William C Wetsel
All FDA-approved antipsychotic drugs (APDs) target primarily dopamine D2 or serotonin (5-HT2A) receptors, or both; however, these medications are not universally effective, they may produce undesirable side-effects, and provide only partial amelioration of negative and cognitive symptoms. The heterogeneity of pharmacological responses in schizophrenic patients suggests additional drug-targets may be effective in improving aspects of this syndrome. Recent evidence suggests that 5-HT2C receptors may be a promising target for schizophrenia since their activation reduces mesolimbic nigrostriatal dopamine release (which conveys antipsychotic action), they are expressed almost exclusively in CNS, and have weight-loss promoting capabilities...
March 15, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28293111/influence-of-cfh-gene-on-symptom-severity-of-schizophrenia
#17
Chen Zhang, Qinyu Lv, Weixing Fan, Wei Tang, Zhenghui Yi
OBJECTIVE: Recent advances have provided compelling evidence for the role of excessive complement activity in the pathophysiology of schizophrenia. In this study, we aimed to detect the association of the gene encoding complement factor H (CFH), a regulator in complement activation, with schizophrenia. MATERIALS AND METHODS: A sample of 1783 individuals with or without schizophrenia was recruited for genetic analysis. Genomic DNA samples were extracted from peripheral blood cells using multiplex polymerase chain reaction and the SNaPshot assay...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28293046/efficacy-of-risperidone-augmentation-with-ondansetron-in-the-treatment-of-negative-and-depressive-symptoms-in-schizophrenia-a-randomized-clinical-trial
#18
Roya Samadi, Susan Soluti, Reza Daneshmand, Shervin Assari, Ali Akhoundpour Manteghi
BACKGROUND: Given the potential role of the 5-hydroxytryptamine-3 receptor in the pathogenesis of schizophrenia, this study was performed to determine whether ondansetron plus risperidone could reduce the negative and depressive symptoms in patients with treatment-resistant schizophrenia. METHODS: In a double-blinded, placebo-controlled, randomized trial (IRCT registration # 201112125280N7), in 2012-2013 in Mashhad, Iran, 38 patients with treatment-resistant schizophrenia received risperidone either combined with a fixed dose (4-8 mg/d) of ondansetron (n=18) or with a placebo (n=20) for 12 weeks...
January 2017: Iranian Journal of Medical Sciences
https://www.readbyqxmd.com/read/28291691/explanatory-model-of-illness-of-the-patients-with-schizophrenia-and-the-role-of-educational-intervention
#19
Naila Riaz Awan, Syeda Farhana Jehangir, Muhammad Irfan, Farooq Naeem, Saeed Farooq
This randomized controlled trial was conducted at Department of Psychiatry, Lady Reading Hospital, Peshawar from February to August 2015 to explore beliefs and concepts of patients with schizophrenia about their illness and to find out the effectiveness of structured educational intervention in changing the explanatory models of illness of the patients and in their symptoms reduction. One hundred and three patients were recruited in the trial who were randomly assigned to two groups i.e., Experimental (n=53) and Control i...
March 10, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28291293/-adverse-effects-of-medication-and-quality-of-life-in-patients-receiving-second-generation-antipsychotics-a-comparison-of-long-acting-injectable-and-oral-therapies
#20
Demet Sağlam Aykut, Filiz Civil Arslan, Ahmet Tiryaki, Evrim Özkorumak, Serdar Karakullukçu
OBJECTIVE: Maintenance treatment with antipsychotic drugs for patients with schizophrenia is highly effective in decreasing the recurrence rate of the disease. In the current study, we aimed to compare long-acting second generation antipsychotic drug injections and oral forms of second generation antipsychotic drugs in terms of their adverse effects on quality of life. METHOD: Forty-one patients receiving second generation antipsychotic drugs and 139 patients diagnosed with schizophrenia or schizoaffective disorder were treated with oral second generation antipsychotic drugs and enrolled in the study...
2017: Türk Psikiyatri Dergisi, Turkish Journal of Psychiatry
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