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Neuropsychopharmacology of Psychosis: Relation of Brain Signals, Cognition and Chemistry

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Book Series: Frontiers Research Topics ISSN: 16648714 ISBN: 9782889193356 Year: Pages: 276 DOI: 10.3389/978-2-88919-335-6 Language: English
Publisher: Frontiers Media SA
Subject: Psychiatry --- Medicine (General)
Added to DOAB on : 2016-03-10 08:14:32
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Abstract

Previous research over the past decades has identified diverse neurobiological underpinnings of psychosis. In particular, by combining a variety of different neuroimaging modalities, it has been shown that psychotic states and the actual transition phase from a clinical high-risk state to established psychosis is characterized by structural, functional and neurochemical changes across different brain regions.Further evidence revealed that maybe not only focal brain abnormalities are characteristic for psychosis but specifically also an abnormal functional integration among various brain areas. Some evidence also suggests that dysfunctional brain connectivity proceeds during the development of psychosis when subjects perform a cognitive task. Notably, altered brain connectivity during cognitive challenges was often found to be associated with psychopathological measures, suggesting a mechanistic relation between functional network integrity and the clinical expression of psychosis.Several works proposed that disordered brain connectivity in psychosis results from abnormal N-methyl- D -aspartate receptor (NMDAR)-dependent synaptic plasticity, which can be mediated by other neurotransmitter systems such as dopamine or serotonin. Specific chemically mediated changes in synaptic plasticity may contribute to abnormal functional integration among brain regions and in consequence to impaired learning performances and inferences. Model-based connectivity investigations on synaptic signalling demonstrated for example that manipulation of the NMDA or α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor system altered synaptic plasticity in healthy volunteers, which was predictive for subjects’ cognitive performance and psychopathology. In patients with psychosis, the activity in the prefrontal cortex during the processing of prediction errors, a specific form of learning, which is conveyed via synaptic connections, was linked with individuals’ formation of delusions. These results fit well with many works suggesting that psychotic symptoms or also drug-induced psychosis-like experiences can be explained by disturbances within a hierarchically organized neuronal network, leading to maladaptive integrations of new incoming evidence and thereby to false formations of prediction errors and false beliefs.In this research topic, we like to cover the most recent neurobiological correlates for early stage psychosis and in particular for the prediction of psychosis by using different neurophysiological measures (e.g. structural and functional MRI, EEG, DTI or PET). Studies exploring effective connectivity or complex brain networks such as small-world properties with techniques like dynamic causal modelling, structural equation modelling, or graph theory analysis are highly appreciated. Very welcome are studies proving a link between clinical features such as psychopathology and cognition, brain signals, and chemistry (also in regard of antipsychotic treatments or substance-induced psychotic states). Moreover, environmental factors that may influence psychosis onset or its’ developmental processes will be brought together with a diversity of different research modalities. We also collect critical reviews, mini-reviews or theoretical reflections from leading international researcher and clinicians in this field. The purpose of our research topic is intended to provide a state-of-the-art cognitive perspective to consider developing psychosis, which might shed more lights into the pathophysiological and neurobiological mechanisms of psychosis.

Family Iridoviridae Molecular and Ecological Studies of a Family Infecting Invertebrates and Ectothermic Vertebrates

Authors: ---
ISBN: 9783039215164 9783039215171 Year: Pages: 234 DOI: 10.3390/books978-3-03921-517-1 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Biology
Added to DOAB on : 2019-12-09 11:49:15
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Abstract

Ranaviruses and other viruses within the family Iridoviridae, infect a wide range of ecologically and commercially important ectothermic vertebrates, i.e., bony fish, amphibians, and reptiles, and invertebrates, including agricultural and medical pests and cultured shrimp and crayfish, and are responsible for considerable morbidity and mortality. Understanding the impact of these various agents on diverse host species requires the combined efforts of ecologists, veterinarians, pathologists, comparative immunologists and molecular virologists. Unfortunately, investigators involved in these studies often work in discipline-specific silos that preclude interaction with others whose insights and approaches are required to comprehensively address problems related to ranavirus/iridovirus disease. Our intent here is to breakdown these silos and provide a forum where diverse researchers with a common interest in ranavirus/iridovirus biology can profitably interact. As a colleague once quipped, “Three people make a genius.” We are hoping to do something along those lines by presenting a collection of research articles dealing with issues of anti-viral immunity, identification of a potentially novel viral genus exemplified by erythrocytic necrosis virus, viral inhibition of innate immunity, identification of novel hosts for lymphocystivirus and invertebrate iridoviruses, and modelling studies of ranavirus transmission. Collectively these and others will exemplify the breadth of ongoing studies focused on this virus family.

Keywords

amphibians --- histopathology --- immunohistochemistry --- Mexico --- outbreak --- ranavirus --- risk assessment --- Iridoviridae --- frog virus 3 --- FV3 --- ranavirus --- immunofluorescence --- intracellular localization --- iridovirus --- ranavirus --- epidemiology --- antibody --- ELISA --- virus isolation --- prevalence --- native-fish conservation --- biosecurity --- endemic disease --- Unconventional T cell --- nonclassical MHC --- antiviral immunity --- interferon --- DIV1 --- SHIV --- CQIV --- Macrobrachium rosenbergii --- Macrobrachium nipponense --- Procambarus clarkii --- white head --- susceptible species --- viral load --- erythrocytic necrosis virus (ENV) --- viral erythrocytic necrosis (VEN) --- Pacific salmon --- Pacific herring --- British Columbia --- SHIV --- DIV1 --- Decapodiridovirus --- Exopalaemon carinicauda --- susceptibility --- host --- ISDL --- amphibian --- Ranavirus --- frog virus 3 --- mathematical models --- Bayesian inference --- viral immune evasion --- immunomodulators --- NF-?B --- Imd --- DNA virus --- host-pathogen interactions --- IIV-6 --- Rana grylio virus (RGV) --- iridovirus core proteins --- protein interaction --- aquatic animals --- cross-species transmission --- yeast two-hybrid (Y2H) --- co-immunoprecipitation (Co-IP) --- megalocytivirus --- iridovirus --- European chub --- Lymphocystis disease virus --- Artemia spp. --- viral infection --- Sparus aurata --- viral transmission --- eDNA --- Ranavirus --- Common frog --- Rana temporaria --- early detection --- virus surveillance --- n/a --- transmission modelling --- susceptible-infected (SI) models --- emerging infection --- ranavirosis --- Iridoviridae --- disease dynamics --- ranavirus --- virus binding --- heparan sulfate --- Andrias davidianus ranavirus --- Rana grylio virus --- envelope protein --- lizard --- bearded dragon --- Pogona vitticeps --- cricket --- Gryllus bimaculatus

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