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https://www.readbyqxmd.com/read/28091572/a-computational-psychiatry-approach-identifies-how-alpha-2a-noradrenergic-agonist-guanfacine-affects-feature-based-reinforcement-learning-in-the-macaque
#1
S A Hassani, M Oemisch, M Balcarras, S Westendorff, S Ardid, M A van der Meer, P Tiesinga, T Womelsdorf
Noradrenaline is believed to support cognitive flexibility through the alpha 2A noradrenergic receptor (a2A-NAR) acting in prefrontal cortex. Enhanced flexibility has been inferred from improved working memory with the a2A-NA agonist Guanfacine. But it has been unclear whether Guanfacine improves specific attention and learning mechanisms beyond working memory, and whether the drug effects can be formalized computationally to allow single subject predictions. We tested and confirmed these suggestions in a case study with a healthy nonhuman primate performing a feature-based reversal learning task evaluating performance using Bayesian and Reinforcement learning models...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28089652/hippocampal-prefrontal-connectivity-as-a-translational-phenotype-for-schizophrenia
#2
REVIEW
Florian Bähner, Andreas Meyer-Lindenberg
Finding novel biological targets in psychiatry has been difficult, partly because current diagnostic categories are not defined by pathophysiology and difficult to model in animals. The study of species-conserved systems-level mechanisms implicated in psychiatric disease could be a promising strategy to address some of these difficulties. Altered hippocampal-prefrontal (HC-PFC) connectivity during working memory (WM) processing is a candidate for such a translational phenotype as it has been repeatedly associated with impaired cognition in schizophrenia patients and animal models for psychiatric risk factors...
January 12, 2017: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28089559/microglia-derived-neuregulin-expression-in-psychiatric-disorders
#3
Daisuke Ikawa, Manabu Makinodan, Keiko Iwata, Masahiro Ohgidani, Takahiro A Kato, Yasunori Yamashita, Kazuhiko Yamamuro, Sohei Kimoto, Michihiro Toritsuka, Takahira Yamauchi, Shin-Ichi Fukami, Hiroki Yoshino, Kazuki Okumura, Tatsuhide Tanaka, Akio Wanaka, Yuji Owada, Masatsugu Tsujii, Toshiro Sugiyama, Kenji Tsuchiya, Norio Mori, Ryota Hashimoto, Hideo Matsuzaki, Shigenobu Kanba, Toshifumi Kishimoto
Several studies have revealed that neuregulins (NRGs) are involved in brain function and psychiatric disorders. While NRGs have been regarded as neuron- or astrocyte-derived molecules, our research has revealed that microglia also express NRGs, levels of which are markedly increased in activated microglia. Previous studies have indicated that microglia are activated in the brains of individuals with autism spectrum disorders (ASD). Therefore, we investigated microglial NRG mRNA expression in multiple lines of mice considered models of ASD...
January 9, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28089383/-long-term-psychiatric-hospitalizations
#4
L Plancke, A Amariei
BACKGROUND: Long-term hospitalizations in psychiatry raise the question of desocialisation of the patients and the inherent costs. METHODS: Individual indicators were extracted from a medical administrative database containing full-time psychiatric hospitalizations for the period 2011-2013 of people over 16 years old living in the French region of Nord-Pas-de-Calais. We calculated the proportion of people who had experienced a hospitalization with a duration of 292 days or more during the study period...
January 11, 2017: Revue D'épidémiologie et de Santé Publique
https://www.readbyqxmd.com/read/28089312/hunting-down-an-evidence-base-for-adolescent-mental-health
#5
EDITORIAL
The Lancet Psychiatry
No abstract text is available yet for this article.
January 11, 2017: Lancet Psychiatry
https://www.readbyqxmd.com/read/28088867/the-political-use-of-psychiatry-a-comparison-between-totalitarian-regimes
#6
Massimiliano Buoli, Aldo Sabino Giannuli
BACKGROUND: After the end of Second World War, the recent experience of the Nazi horrors stimulated a debate about the political use of psychiatry. Over the years, the focus shifted on major dictatorships of the time and especially on Soviet Union. AIMS: This article aims to provide a critical review of the ways in which psychiatry was used by totalitarian regimes of the 20th century. METHODS: We summarized relevant literature about political use of psychiatry in totalitarian regimes of the 20th century, with particular focus on Fascism, Nazism, Argentina dictatorship, Soviet Union and China...
January 1, 2017: International Journal of Social Psychiatry
https://www.readbyqxmd.com/read/28086761/is-treatment-resistant-schizophrenia-categorically-distinct-from-treatment-responsive-schizophrenia-a-systematic-review
#7
Amy L Gillespie, Ruta Samanaite, Jonathan Mill, Alice Egerton, James H MacCabe
BACKGROUND: Schizophrenia is a highly heterogeneous disorder, and around a third of patients are treatment-resistant. The only evidence-based treatment for these patients is clozapine, an atypical antipsychotic with relatively weak dopamine antagonism. It is plausible that varying degrees of response to antipsychotics reflect categorically distinct illness subtypes, which would have significant implications for research and clinical practice. If these subtypes could be distinguished at illness onset, this could represent a first step towards personalised medicine in psychiatry...
January 13, 2017: BMC Psychiatry
https://www.readbyqxmd.com/read/28078203/catatonia-our-current-understanding-of-its-diagnosis-treatment-and-pathophysiology
#8
REVIEW
Sean A Rasmussen, Michael F Mazurek, Patricia I Rosebush
Catatonia is a psychomotor syndrome that has been reported to occur in more than 10% of patients with acute psychiatric illnesses. Two subtypes of the syndrome have been identified. Catatonia of the retarded type is characterized by immobility, mutism, staring, rigidity, and a host of other clinical signs. Excited catatonia is a less common presentation in which patients develop prolonged periods of psychomotor agitation. Once thought to be a subtype of schizophrenia, catatonia is now recognized to occur with a broad spectrum of medical and psychiatric illnesses, particularly affective disorders...
December 22, 2016: World Journal of Psychiatry
https://www.readbyqxmd.com/read/28076638/the-future-of-psychiatric-research
#9
Marco Antonio Caldieraro
Psychiatric disorders place considerable burden on individuals and on public health. Funding for research in psychiatry is less than ideal, but even so high quality research is being conducted at many centers. However, these studies have not impacted clinical practice as much as expected. The complexity of psychiatric disorders is one of the reasons why we face difficulties in translating research results to patient care. New technologies and improved methodologies are now available and must be incorporated to deal with this complexity and to accelerate the translational process...
October 2016: Trends in Psychiatry and Psychotherapy
https://www.readbyqxmd.com/read/28073811/exploratory-trials-in-mental-health-anything-to-learn-from-other-disciplines
#10
Sven Trelle
OBJECTIVE: Confirmatory randomised controlled trials require solid justifications, especially with regard to whether the experimental intervention is promising. Such evidence is generated in exploratory trials. However, empirical evidence shows that the quality of such trials is still suboptimal. More generally, the development process of healthcare interventions and especially of drugs, remains inefficient. Over the past 10-20 years, a vast amount of methodological work has been published about exploratory trials...
January 10, 2017: Evidence-based Mental Health
https://www.readbyqxmd.com/read/28073112/space-and-objects-on-the-phenomenology-and-cognitive-neuroscience-of-anomalous-perception-in-schizophrenia-ancillary-article-to-eawe-domain-1
#11
Steven M Silverstein, Docia Demmin, Borut Škodlar
BACKGROUND/AIMS: Perception of space and objects is a traditional focus within phenomenology, and disturbances in these aspects of perception among people with schizophrenia have long been discussed within phenomenological psychiatry. Despite this, there has been little empirical work on the causes and effects of most of these perceptual alterations in people with schizophrenia. Progress towards this goal can be accelerated by the use of EAWE (Examination of Anomalous World Experience), an interview-based tool to elicit, categorize, and quantify abnormal perceptual and other experiential phenomena...
January 11, 2017: Psychopathology
https://www.readbyqxmd.com/read/28071147/abstracts-of-presentations-at-the-joint-meeting-of-the-eeg-clinical-neuroscience-society-ecns-the-international-society-for-brain-electromagnetic-topography-isbet-and-the-international-society-for-neuroimaging-in-psychiatry-isnip-in-halifax-nova-scotia-canada
#12
(no author information available yet)
No abstract text is available yet for this article.
October 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/28071142/erratum
#13
(no author information available yet)
Lee J, Takeuchi H, Fervaha G, Sin GL, Foussias G, Agid O, Farooq S, Remington G. Subtyping schizophrenia by treatment response: antipsychotic development and the central role of positive symptoms. Can J Psychiatry. 2015;60(11):515-522. Original DOI: 10.1177/070674371506001107. In Table 2 of the above article, in "Proposed criteria for clozapine resistance" for "Current illness severity," the CGI-SCH positive was stated as "> 4" but it should be "CGI-SCH positive ≥ 4." The corrected table is below. [Table: see text]...
March 2016: Canadian Journal of Psychiatry. Revue Canadienne de Psychiatrie
https://www.readbyqxmd.com/read/28070643/candidate-gene-associations-studies-in-psychiatry-time-to-move-forward
#14
EDITORIAL
C Arango
No abstract text is available yet for this article.
January 9, 2017: European Archives of Psychiatry and Clinical Neuroscience
https://www.readbyqxmd.com/read/28070126/lipocalin-2-protects-the-brain-during-inflammatory-conditions
#15
S S Kang, Y Ren, C-C Liu, A Kurti, K E Baker, G Bu, Y Asmann, J D Fryer
Sepsis is a prevalent health issue that can lead to central nervous system (CNS) inflammation with long-term behavioral and cognitive alterations. Using unbiased proteomic profiling of over 100 different cytokines, we found that Lipocalin-2 (LCN2) was the most substantially elevated protein in the CNS after peripheral administration of lipopolysaccharide (LPS). To determine whether the high level of LCN2 in the CNS is protective or deleterious, we challenged Lcn2(-/-) mice with peripheral LPS and determined effects on behavior and neuroinflammation...
January 10, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28070124/an-endophenotype-approach-to-the-genetics-of-alcohol-dependence-a-genome-wide-association-study-of-fast-beta-eeg-in-families-of-african-ancestry
#16
J L Meyers, J Zhang, J C Wang, J Su, S I Kuo, M Kapoor, L Wetherill, S Bertelsen, D Lai, J E Salvatore, C Kamarajan, D Chorlian, A Agrawal, L Almasy, L Bauer, K K Bucholz, G Chan, V Hesselbrock, L Koganti, J Kramer, S Kuperman, N Manz, A Pandey, M Seay, D Scott, R E Taylor, D M Dick, H J Edenberg, A Goate, T Foroud, B Porjesz
Fast beta (20-28 Hz) electroencephalogram (EEG) oscillatory activity may be a useful endophenotype for studying the genetics of disorders characterized by neural hyperexcitability, including substance use disorders (SUDs). However, the genetic underpinnings of fast beta EEG have not previously been studied in a population of African-American ancestry (AA). In a sample of 2382 AA individuals from 482 families drawn from the Collaborative Study on the Genetics of Alcoholism (COGA), we performed a genome-wide association study (GWAS) on resting-state fast beta EEG power...
January 10, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28070123/a-meta-analysis-of-peripheral-blood-nerve-growth-factor-levels-in-patients-with-schizophrenia
#17
X-Y Qin, H-T Wu, C Cao, Y P Loh, Y Cheng
Neurotrophins particularly brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF) are crucial modulators in the neurodevelopment and maintenance of central and peripheral nervous systems. Neurotrophin hypothesis of schizophrenia (SCZ) postulated that the changes in the brains of SCZ patients are the result of disturbances of developing processes involving neurotrophic factors. This hypothesis was mainly supported by the abnormal regulation of BDNF in SCZ, especially the decreased peripheral blood BDNF levels in SCZ patients validated by several meta-analyses...
January 10, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28070121/nrsf-dependent-epigenetic-mechanisms-contribute-to-programming-of-stress-sensitive-neurons-by-neonatal-experience-promoting-resilience
#18
A Singh-Taylor, J Molet, S Jiang, A Korosi, J L Bolton, Y Noam, K Simeone, J Cope, Y Chen, A Mortazavi, T Z Baram
Resilience to stress-related emotional disorders is governed in part by early-life experiences. Here we demonstrate experience-dependent re-programming of stress-sensitive hypothalamic neurons, which takes place through modification of neuronal gene expression via epigenetic mechanisms. Specifically, we found that augmented maternal care reduced glutamatergic synapses onto stress-sensitive hypothalamic neurons and repressed expression of the stress-responsive gene, Crh. In hypothalamus in vitro, reduced glutamatergic neurotransmission recapitulated the repressive effects of augmented maternal care on Crh, and this required recruitment of the transcriptional repressor repressor element-1 silencing transcription factor/neuron restrictive silencing factor (NRSF)...
January 10, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28070120/the-protocadherin-17-gene-affects-cognition-personality-amygdala-structure-and-function-synapse-development-and-risk-of-major-mood-disorders
#19
H Chang, N Hoshina, C Zhang, Y Ma, H Cao, Y Wang, D-D Wu, S E Bergen, M Landén, C M Hultman, M Preisig, Z Kutalik, E Castelao, M Grigoroiu-Serbanescu, A J Forstner, J Strohmaier, J Hecker, T G Schulze, B Müller-Myhsok, A Reif, P B Mitchell, N G Martin, P R Schofield, S Cichon, M M Nöthen, H Walter, S Erk, A Heinz, N Amin, C M van Duijn, A Meyer-Lindenberg, H Tost, X Xiao, T Yamamoto, M Rietschel, M Li
Major mood disorders, which primarily include bipolar disorder and major depressive disorder, are the leading cause of disability worldwide and pose a major challenge in identifying robust risk genes. Here, we present data from independent large-scale clinical data sets (including 29 557 cases and 32 056 controls) revealing brain expressed protocadherin 17 (PCDH17) as a susceptibility gene for major mood disorders. Single-nucleotide polymorphisms (SNPs) spanning the PCDH17 region are significantly associated with major mood disorders; subjects carrying the risk allele showed impaired cognitive abilities, increased vulnerable personality features, decreased amygdala volume and altered amygdala function as compared with non-carriers...
January 10, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28070119/ocd-like-behavior-is-caused-by-dysfunction-of-thalamo-amygdala-circuits-and-upregulated-trkb-erk-mapk-signaling-as-a-result-of-spred2-deficiency
#20
M Ullrich, M Weber, A M Post, S Popp, J Grein, M Zechner, H Guerrero González, A Kreis, A G Schmitt, N Üçeyler, K-P Lesch, K Schuh
Obsessive-compulsive disorder (OCD) is a common neuropsychiatric disease affecting about 2% of the general population. It is characterized by persistent intrusive thoughts and repetitive ritualized behaviors. While gene variations, malfunction of cortico-striato-thalamo-cortical (CSTC) circuits, and dysregulated synaptic transmission have been implicated in the pathogenesis of OCD, the underlying mechanisms remain largely unknown. Here we show that OCD-like behavior in mice is caused by deficiency of SPRED2, a protein expressed in various brain regions and a potent inhibitor of Ras/ERK-MAPK signaling...
January 10, 2017: Molecular Psychiatry
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