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https://www.readbyqxmd.com/read/28138159/caspase-3-dependent-cleavage-of-akt-modulates-tau-phosphorylation-via-gsk3%C3%AE-kinase-implications-for-alzheimer-s-disease
#1
J Chu, E Lauretti, D Praticò
The pathological hallmark of Alzheimer's disease (AD) is accumulation of misfolded amyloid-β peptides and hyperphosphorylated tau protein in the brain. Increasing evidence suggests that serine-aspartyl proteases-caspases are activated in the AD brain. Previous studies identified a caspase-3 cleavage site within the amyloid-β precursor protein, and a caspase-3 cleavage of tau as the mechanisms involved in the development of Aβ and tau neuropathology, respectively. However, the potential role that caspase-3 could have on tau metabolism remains unknown...
January 31, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28100276/realising-stratified-psychiatry-using-multidimensional-signatures-and-trajectories
#2
Dan W Joyce, Angie A Kehagia, Derek K Tracy, Jessica Proctor, Sukhwinder S Shergill
BACKGROUND: Stratified or personalised medicine targets treatments for groups of individuals with a disorder based on individual heterogeneity and shared factors that influence the likelihood of response. Psychiatry has traditionally defined diagnoses by constellations of co-occurring signs and symptoms that are assigned a categorical label (e.g. schizophrenia). Trial methodology in psychiatry has evaluated interventions targeted at these categorical entities, with diagnoses being equated to disorders...
January 18, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/28089652/hippocampal-prefrontal-connectivity-as-a-translational-phenotype-for-schizophrenia
#3
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...
February 2017: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
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
#4
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/28053132/varieties-of-voice-hearing-psychics-and-the-psychosis-continuum
#5
Albert R Powers, Megan S Kelley, Philip R Corlett
Hearing voices that are not present is a prominent symptom of serious mental illness. However, these experiences may be common in the non-help-seeking population, leading some to propose the existence of a continuum of psychosis from health to disease. Thus far, research on this continuum has focused on what is impaired in help-seeking groups. Here we focus on protective factors in non-help-seeking voice-hearers. We introduce a new study population: clairaudient psychics who receive daily auditory messages...
January 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/28049075/abnormal-brain-oscillations-persist-after-recovery-from-bipolar-depression
#6
P Canali, S Casarotto, M Rosanova, G Sferrazza-Papa, A G Casali, O Gosseries, M Massimini, E Smeraldi, C Colombo, F Benedetti
When directly perturbed in healthy subjects, premotor cortical areas generate electrical oscillations in the beta range (20-40Hz). In schizophrenia, major depressive disorder and bipolar disorder (BD), these oscillations are markedly reduced, in terms of amplitude and frequency. However, it still remains unclear whether these abnormalities can be modulated over time, or if they can be still observed after treatment. Here, we employed transcranial magnetic stimulation (TMS) combined with EEG to assess the frontal oscillatory activity in eighteen BD patients before/after antidepressant treatments (sleep deprivation and light therapy), relative to nine healthy controls...
December 27, 2016: European Psychiatry: the Journal of the Association of European Psychiatrists
https://www.readbyqxmd.com/read/28044063/molecular-mechanisms-underlying-noncoding-risk-variations-in-psychiatric-genetic-studies
#7
REVIEW
X Xiao, H Chang, M Li
Recent large-scale genetic approaches such as genome-wide association studies have allowed the identification of common genetic variations that contribute to risk architectures of psychiatric disorders. However, most of these susceptibility variants are located in noncoding genomic regions that usually span multiple genes. As a result, pinpointing the precise variant(s) and biological mechanisms accounting for the risk remains challenging. By reviewing recent progresses in genetics, functional genomics and neurobiology of psychiatric disorders, as well as gene expression analyses of brain tissues, here we propose a roadmap to characterize the roles of noncoding risk loci in the pathogenesis of psychiatric illnesses (that is, identifying the underlying molecular mechanisms explaining the genetic risk conferred by those genomic loci, and recognizing putative functional causative variants)...
January 3, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28032396/computational-neuroscience-approach-to-biomarkers-and-treatments-for-mental-disorders
#8
Noriaki Yahata, Kiyoto Kasai, Mitsuo Kawato
Psychiatry research has long experienced a stagnation stemming from a lack of understanding of the neurobiological underpinnings of phenomenologically defined mental disorders. Recently, the application of computational neuroscience to psychiatry research has shown great promise in establishing a link between phenomenological and pathophysiological aspects of mental disorders, thereby recasting current nosology in more biologically meaningful dimensions. In this review, we highlight recent investigations in computational neuroscience that undertook either theory- or data-driven approaches to quantitatively delineate the mechanisms of mental disorders...
December 29, 2016: Psychiatry and Clinical Neurosciences
https://www.readbyqxmd.com/read/28017817/towards-a-better-understanding-on-the-role-of-prediction-error-on-memory-processes-from-bench-to-clinic
#9
María C Krawczyk, Rodrigo S Fernández, María E Pedreira, Mariano M Boccia
psychology defines Prediction Error (PE) as a mismatch between expected and current events. It represents a unifier concept within the memory field, as it is the driving force of memory acquisition and updating. Prediction error induces updating of consolidated memories in strength or content by memory reconsolidation. This process has two different neurobiological phases, which involves the destabilization (labilization) of a consolidated memory followed by its restabilization. The aim of this work is to emphasize the functional role of PE on the neurobiology of learning and memory, integrating and discussing different research areas: behavioural, neurobiological, computational and clinical psychiatry...
December 22, 2016: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28009246/locating-risk-in-the-adolescent-brain-ethical-challenges-in-the-use-of-biomarkers-for-adolescent-health-and-social-policy
#10
Suparna Choudhury, Sheehan Moore
Technological developments in neuroscience over the last 20 years have generated excitement about the potential of neuroscientific insights for the understanding of and intervention in children's and adolescents' behavior. This article introduces some ways in which new results from developmental cognitive neuroscience have been appropriated in the context of adolescent mental health. We also consider social and interpersonal factors that drive the use of neurobiological markers of mental disorders in pediatric psychiatry...
December 1, 2016: AMA Journal of Ethics
https://www.readbyqxmd.com/read/27994220/structural-dysconnectivity-of-key-cognitive-and-emotional-hubs-in-young-people-at-high-genetic-risk-for-bipolar-disorder
#11
G Roberts, A Perry, A Lord, A Frankland, V Leung, E Holmes-Preston, F Levy, R K Lenroot, P B Mitchell, M Breakspear
Emerging evidence suggests that psychiatric disorders are associated with disturbances in structural brain networks. Little is known, however, about brain networks in those at high risk (HR) of bipolar disorder (BD), with such disturbances carrying substantial predictive and etiological value. Whole-brain tractography was performed on diffusion-weighted images acquired from 84 unaffected HR individuals with at least one first-degree relative with BD, 38 young patients with BD and 96 matched controls (CNs) with no family history of mental illness...
December 20, 2016: Molecular Psychiatry
https://www.readbyqxmd.com/read/27994004/biological-aging-and-the-future-of-geriatric-psychiatry
#12
REVIEW
Bret R Rutherford, Warren D Taylor, Patrick J Brown, Joel R Sneed, Steven P Roose
Advances in understanding the biological bases of aging have intellectually revitalized the field of geriatric psychiatry and broadened its scope to include promoting successful aging and studying resilience factors in older adults. To describe the process by which this paradigm shift has occurred and illustrate its implications for treatment and research of late-life brain disorders, late-life depression is discussed as a prototype case. Prior phases of geriatric psychiatry research were focused on achieving depressive symptom relief, outlining pharmacokinetic and pharmacodynamic differences between older and younger adults, and identifying moderators of treatment response...
December 18, 2016: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/27992453/helpful-factors-in-the-treatment-of-depression-from-the-patient-s-carer-s-and-professional-s-perspective-a-concept-map-study
#13
Rosa A van Grieken, Hanka F Verburg, Maarten W J Koeter, Jessica Stricker, Udo W Nabitz, Aart H Schene
OBJECTIVE: Depression research has resulted in knowledge about neurobiology, pharmacological strategies and short-term cost-effective treatments. However, more than two-thirds of all depressed patients experience insufficient improvement. Therefore, a better understanding of what patients, carers and professionals perceive as most helpful in the treatment of depression is needed. METHODS: Concept mapping, a mixed-method design, was used to identify the patients (n = 33), carers (n = 22) and professionals (n = 50) perspectives...
2016: PloS One
https://www.readbyqxmd.com/read/27918562/resting-state-connectivity-biomarkers-define-neurophysiological-subtypes-of-depression
#14
Andrew T Drysdale, Logan Grosenick, Jonathan Downar, Katharine Dunlop, Farrokh Mansouri, Yue Meng, Robert N Fetcho, Benjamin Zebley, Desmond J Oathes, Amit Etkin, Alan F Schatzberg, Keith Sudheimer, Jennifer Keller, Helen S Mayberg, Faith M Gunning, George S Alexopoulos, Michael D Fox, Alvaro Pascual-Leone, Henning U Voss, B J Casey, Marc J Dubin, Conor Liston
Biomarkers have transformed modern medicine but remain largely elusive in psychiatry, partly because there is a weak correspondence between diagnostic labels and their neurobiological substrates. Like other neuropsychiatric disorders, depression is not a unitary disease, but rather a heterogeneous syndrome that encompasses varied, co-occurring symptoms and divergent responses to treatment. By using functional magnetic resonance imaging (fMRI) in a large multisite sample (n = 1,188), we show here that patients with depression can be subdivided into four neurophysiological subtypes ('biotypes') defined by distinct patterns of dysfunctional connectivity in limbic and frontostriatal networks...
January 2017: Nature Medicine
https://www.readbyqxmd.com/read/27786179/the-road-to-precision-psychiatry-translating-genetics-into-disease-mechanisms
#15
REVIEW
Michael J Gandal, Virpi Leppa, Hyejung Won, Neelroop N Parikshak, Daniel H Geschwind
Hundreds of genetic loci increasing risk for neuropsychiatric disorders have recently been identified. This success, perhaps paradoxically, has posed challenges for therapeutic development, which are amplified by the highly polygenic and pleiotropic nature of these genetic contributions. Success requires understanding the biological impact of single genetic variants and predicting their effects within an individual. Comprehensive functional genomic annotation of risk loci provides a framework for interpretation of neurobiological impact, requiring experimental validation with in vivo or in vitro model systems...
October 26, 2016: Nature Neuroscience
https://www.readbyqxmd.com/read/27671475/transgenerational-disruption-of-functional-5-ht1ar-induced-connectivity-in-the-adult-mouse-brain-by-traumatic-stress-in-early-life
#16
F Razoux, H Russig, T Mueggler, C Baltes, K Dikaiou, M Rudin, I M Mansuy
Traumatic stress in early life is a strong risk factor for psychiatric disorders that can affect individuals across several generations. Although the underlying mechanisms have been proposed to implicate serotonergic transmission in the brain, the neural circuits involved remain poorly delineated. Using pharmacological functional magnetic resonance imaging in mice, we demonstrate that traumatic stress in postnatal life alters 5-HT1A receptor-evoked local and global functions in both, the exposed animals and their progeny when adult...
September 27, 2016: Molecular Psychiatry
https://www.readbyqxmd.com/read/27570905/-the-concept-of-typology-in-psychiatry-in-the-context-of-historical-contributions-of-max-weber-and-karl-jaspers
#17
M Jäger, T Becker, M E Wigand
Against the background of Max Weber's and Karl Jaspers' outstanding historical contributions to the conceptual development of different typologies, the importance of a psychiatric typology is examined. The term "ideal type" was introduced into social science by Weber as an analytical construct to describe and classify cultural phenomena. This concept was adopted for the psychiatric context by Jaspers who proposed to establish a typological system in the field of psychotic disturbances without an organic correlate...
August 2016: Fortschritte der Neurologie-Psychiatrie
https://www.readbyqxmd.com/read/27551945/therapeutic-drug-monitoring-as-a-measure-of-proactive-pharmacovigilance-in-child-and-adolescent-psychiatry
#18
Manfred Gerlach, Karin Egberts, Su-Yin Dang, Paul Plener, Regina Taurines, Claudia Mehler-Wex, Marcel Romanos
Off-label or unlicensed use of psychotropic drugs is common rather than the exception in child and adolescent psychiatry. This use exposes patients to an unknown additional risk of ineffective or even harmful treatment. In addition, treatment with psychotropic drugs during a period of life when the patient undergoes marked developmental hormonal and neurobiological changes often requires different dosing regimes in later life and may result in adverse drug reactions, which are either not seen in adults at all or not in the same frequency...
November 2016: Expert Opinion on Drug Safety
https://www.readbyqxmd.com/read/27514542/how-valid-is-placebo-in-the-indian-setting
#19
Himanshu Sharma, Bharti Sharma
Background-The Placebo is defined as an inert substance with a potent therapeutic effect. Its effect is attributed to its psychological and neurobiological effect. Its use in Psychiatric drug practice in drug trials and clinical practice is common, especially in India .Currently there is a debate whether to use it or not as there are ethical, moral and legal issues. Also, its mechanism of action is not known. Discussion-The Indian Psychiatry scenario is muddled in relation to use of placebo in Randomized Controlled Trials or Psychiatric clinical practice...
August 10, 2016: Central Nervous System Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/27491537/-social-psychiatry-and-neurobiology-a-long-overdue-convergence-exemplified-by-schizophrenia
#20
W Kawohl, C Wyss, P Roser, M Brüne, W Rössler, G Juckel
BACKGROUND: The proliferation of biological psychiatry has greatly increased over the last two decades. With the possibility to carry out brain research using modern technical methods, it seemed that social influencing factors would lose importance in the development of mental diseases; however, in actual fact this does not seem to be justified. It is necessary to overcome this separation, in that social factors are incorporated into a conceptual framework in the development of mental diseases, which simultaneously also takes the results of current neurobiological research into consideration...
August 4, 2016: Der Nervenarzt
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