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Progress in neurobiology

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https://www.readbyqxmd.com/read/29231139/catechol-o-methyltransferase-cognition-and-alzheimer-s-disease
#1
Matea Nikolac Perkovic, Dubravka Svob Strac, Lucija Tudor, Marcela Konjevod, Gordana Nedic Erjavec, Nela Pivac
OBJECTIVE: Cognition is a complex trait representing a set of all mental abilities and processes related to knowledge. Although diverse brain regions are involved, most cognitive processes appear to engage cortical regions. The activity of dopaminergic neurons in prefrontal cortex represents a biological substrate underlying cognitive functions. Alzheimer's disease (AD) is the most frequent dementia associated with cognitive impairments. Cognitive impairment in AD starts slow with discrete deterioration in memory, language, thinking and reasoning, but it progresses into more severe and debilitating cognitive dysfunction...
December 11, 2017: Current Alzheimer Research
https://www.readbyqxmd.com/read/29198272/paradigm-shifts-in-the-neuropsychology-of-epilepsy
#2
Bruce Hermann, David W Loring, Sarah Wilson
This article reviews the major paradigm shifts that have occurred in the area of the application of clinical and experimental neuropsychology to epilepsy and epilepsy surgery since the founding of the International Neuropsychological Society. The five paradigm shifts discussed include: 1) The neurobiology of cognitive disorders in epilepsy - expanding the landscape of syndrome-specific neuropsychological impairment; 2) pathways to comorbidities: bidirectional relationships and their clinical implications; 3) discovering quality of life: The concept, its quantification and applicability; 4) outcomes of epilepsy surgery: challenging conventional wisdom; and 5) Iatrogenic effects of treatment: cognitive and behavioral effects of antiepilepsy drugs...
October 2017: Journal of the International Neuropsychological Society: JINS
https://www.readbyqxmd.com/read/29194693/the-development-and-implementation-of-a-multi-couple-therapy-model-with-torture-survivors-in-the-democratic-republic-of-the-congo
#3
Erin Morgan, Elizabeth Wieling, John Hubbard, Elsa Kraus
In this article, we present development and feasibility of implementation of a multi-couple group for use with torture-surviving couples. The model was developed in the Democratic Republic of the Congo in a community that experienced widespread torture during the wars from 1998 to 2004. The Torture-Surviving Couple Group model is a short-term intervention designed to use few human resources to address relational difficulties resulting from exposure to traumatic stressors. The model was guided by critical and feminist epistemologies and employed an ecological lens to incorporate neurobiology and attachment processes along with narrative therapy techniques...
December 1, 2017: Journal of Marital and Family Therapy
https://www.readbyqxmd.com/read/29190830/reduced-functional-connectivity-of-fronto-parietal-sustained-attention-networks-in-severe-childhood-abuse
#4
Heledd Hart, Lena Lim, Mitul A Mehta, Antonia Chatzieffraimidou, Charles Curtis, Xiaohui Xu, Gerome Breen, Andrew Simmons, Kah Mirza, Katya Rubia
Childhood maltreatment is associated with attention deficits. We examined the effect of childhood abuse and abuse-by-gene (5-HTTLPR, MAOA, FKBP5) interaction on functional brain connectivity during sustained attention in medication/drug-free adolescents. Functional connectivity was compared, using generalised psychophysiological interaction (gPPI) analysis of functional magnetic resonance imaging (fMRI) data, between 21 age-and gender-matched adolescents exposed to severe childhood abuse and 27 healthy controls, while they performed a parametrically modulated vigilance task requiring target detection with a progressively increasing load of sustained attention...
2017: PloS One
https://www.readbyqxmd.com/read/29188027/recent-advances-in-the-understanding-and-management-of-bipolar-disorder-in-adults
#5
REVIEW
Janusz K Rybakowski
This article focuses on some aspects of recent progress in the neurobiology and treatment of bipolar disorder (BD) in adults. A molecular-genetic approach to the etiopathogenesis of the illness resulted in the findings of a genetic overlap between BD and other major psychiatric disorders. Furthermore, a poly-gene-environmental interaction in the development of the illness has been demonstrated. For the management of BD, new drugs with putative mood-stabilizing properties have been introduced in the past two decades...
2017: F1000Research
https://www.readbyqxmd.com/read/29174112/mechanism-of-rhinella-icterica-spix-1824-toad-poisoning-using-in-vitro-neurobiological-preparations
#6
Raquel Soares Oliveira, Allan Pinto Leal, Barbara Ogata, Carlos Gabriel Moreira de Almeida, Douglas Silva Dos Santos, Leandro Homrich Lorentz, Cleci Menezes Moreira, Karla de Castro Figueiredo Bordon, Eliane Candiani Arantes, Tiago Gomes Dos Santos, Cháriston André Dal Belo, Lúcia Vinadé
The biological activity of Rhinella icterica toxic secretion (RITS) was evaluated on chick neuromuscular junctions, rat heart́s tissue and mice hippocampal slices. At chick biventer cervicis preparation, RITS (5, 10 and 20μg/mL) produced a concentration-independent irreversible neuromuscular blockade, which was preceded by a transitory increase of muscle twitch tension with the lowest concentration, in 120minutes recordings. In this set of experiments, RITS incubation partially prevented the curare neuromuscular blockade...
November 23, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/29171994/hippocampal-stratum-radiatum-lacunosum-and-moleculare-sparing-in-mild-cognitive-impairment
#7
Li Su, Lawrence Hayes, Soteris Soteriades, Guy Williams, Susannah A E Brain, Michael J Firbank, Giulia Longoni, Robert J Arnold, James B Rowe, John T O'Brien
BACKGROUND: Alzheimer's disease (AD) is associated with atrophy in entorhinal cortex (ERC), the hippocampus, and its subfields Cornu Ammonis 1 (CA1) and subiculum, which predict conversion from mild cognitive impairment (MCI) to clinical AD. The stratum radiatum, lacunosum, and moleculare (SRLM) are also important gateways involving ERC and CA1, which are affected by early AD pathology. OBJECTIVE: To assess whether the SRLM is affected in MCI and AD. METHODS: In this proof-of-concept study, 27 controls, 13 subjects with AD, and 22 with MCI underwent 3T MRI...
November 20, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29167833/disorder-specific-and-shared-brain-abnormalities-during-vigilance-in-autism-and-obsessive-compulsive-disorder
#8
Christina O Carlisi, Luke Norman, Clodagh M Murphy, Anastasia Christakou, Kaylita Chantiluke, Vincent Giampietro, Andrew Simmons, Michael Brammer, Declan G Murphy, David Mataix-Cols, Katya Rubia
Background: Autism spectrum disorder (ASD) and obsessive-compulsive disorder (OCD) are often comorbid and share similarities across some cognitive phenotypes, including certain aspects of attention. However, no functional magnetic resonance imaging studies have compared the underlying neural mechanisms contributing to these shared phenotypes. Methods: Age- and IQ-matched boys (11-17 years old) with ASD (n = 20), boys with OCD (n = 20), and healthy control boys (n = 20) performed a parametrically modulated psychomotor vigilance functional magnetic resonance imaging task...
November 2017: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
https://www.readbyqxmd.com/read/29158943/depression-in-parkinson-s-disease-the-contribution-from-animal-studies
#9
REVIEW
Jéssica Lopes Fontoura, Camila Baptista, Flávia de Brito Pedroso, José Augusto Pochapski, Edmar Miyoshi, Marcelo Machado Ferro
Besides being better known for causing motor impairments, Parkinson's disease (PD) can also cause many nonmotor symptoms, like depression and anxiety, which can cause significant loss of life quality and may not respond to regular drugs treatment. In this review, we discuss the depression in PD, based on data from studies in humans and rodents. Depression frequency seems higher in PD patients than in general population, despite high variation in data due to diagnosis disparities. Development of depression in PD seems more likely to be caused by the nigrostriatal pathway degeneration than as a consequence of the awareness of disease prognostic, and it seems to be related to dopaminergic, noradrenergic, and serotoninergic synapses deficits...
2017: Parkinson's Disease
https://www.readbyqxmd.com/read/29158111/brain-derived-neurotrophic-factor-bdnf-determines-a-sex-difference-in-cue-conditioned-alcohol-seeking-in-rats
#10
Samuel J Hogarth, Emily J Jaehne, Maarten van den Buuse, Elvan Djouma
Alcohol use disorder is a detrimental addictive disease that develops through prolonged ethanol exposure and regular intoxication. However, the changes in the underlying neurobiology leading to alcohol addiction remain unclear. Brain-Derived Neurotrophic Factor (BDNF) is implicated in substance abuse disorders including alcoholism. As the vast majority of previous animal model studies have concentrated on males only, the aim of this study was to determine whether endogenous BDNF mediates alcohol seeking in a sex-specific manner...
November 17, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/29146502/protracted-motivational-dopamine-related-deficits-following-adolescence-sugar-overconsumption
#11
Fabien Naneix, Florence Darlot, Véronique De Smedt-Peyrusse, Jean-Rémi Pape, Etienne Coutureau, Martine Cador
Adolescence represents a critical period characterized by major neurobiological changes. Chronic stimulation of the reward system during adolescence might constitute an important factor of vulnerability to pathological development. Increasing evidences suggest that adolescent overconsumption of sweet palatable foods impact reward-based processes. However, the neurobiological bases of these deficits remain poorly understood. Previous studies have demonstrated motivational deficits for palatable foods after sweet diet exposure during adolescence that might involve the dopamine (DA) system, a central actor in incentive processes...
February 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29128585/a-return-to-the-psychiatric-dark-ages-with-a-two-system-framework-for-fear
#12
Michael S Fanselow, Zachary T Pennington
The past several decades has seen considerable progress in our understanding of the neurobiology of fear and anxiety. These advancements were spurred on by envisioning fear as emerging from the coordinated activation of brain and behavioral systems that evolved for the purpose of defense from environmental dangers. Recently, Joseph LeDoux, a previous proponent of this view, published a series of papers in which he challenges the value of this approach. As an alternative, he and colleagues propose that a 'two-system' framework for the study of responses to threat will expedite the advancement of medical treatments for fear disorders...
November 9, 2017: Behaviour Research and Therapy
https://www.readbyqxmd.com/read/29118205/epigenetic-etiology-of-intellectual-disability
#13
Shigeki Iwase, Nathalie G Bérubé, Zhaolan Zhou, Nael Nadif Kasri, Elena Battaglioli, Marilyn Scandaglia, Angel Barco
Intellectual disability (ID) is a prevailing neurodevelopmental condition associated with impaired cognitive and adaptive behaviors. Many chromatin-modifying enzymes and other epigenetic regulators have been genetically associated with ID disorders (IDDs). Here we review how alterations in the function of histone modifiers, chromatin remodelers, and methyl-DNA binding proteins contribute to neurodevelopmental defects and altered brain plasticity. We also discuss how progress in human genetics has led to the generation of mouse models that unveil the molecular etiology of ID, and outline the direction in which this field is moving to identify therapeutic strategies for IDDs...
November 8, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29097192/the-endocannabinoid-system-and-its-therapeutic-exploitation-in-multiple-sclerosis-clues-for-other-neuroinflammatory-diseases
#14
REVIEW
Valerio Chiurchiù, Mario van der Stelt, Diego Centonze, Mauro Maccarrone
Multiple sclerosis is the most common inflammatory demyelinating disease of the central nervous system, caused by an autoimmune response against myelin that eventually leads to progressive neurodegeneration and disability. Although the knowledge on its underlying neurobiological mechanisms has considerably improved, there is a still unmet need for new treatment options, especially for the progressive forms of the disease. Both preclinical and clinical data suggest that cannabinoids, derived from the Cannabis sativa plant, may be used to control symptoms such as spasticity and chronic pain, whereas only preclinical data indicate that these compounds and their endogenous counterparts, i...
October 31, 2017: Progress in Neurobiology
https://www.readbyqxmd.com/read/29093685/bipolar-spectrum-disorders-in-male-youth-the-interplay-between-symptom-severity-inflammation-steroid-secretion-and-body-composition
#15
REVIEW
Andreas Walther, Marlene Penz, Daniela Ijacic, Timothy R Rice
The morbidity and societal burden of youth bipolar spectrum disorders (BSD) are high. These disorders are multisystemic in that adult populations there are clear interactions with inflammatory processes and steroidal physiological systems. There are much less data concerning these areas of study in youth populations with BSD. This is surprising given the association of youth-onset BSD with puberty and its associated physiological changes. In this mini-review, we overview the theoretical role of inflammatory processes and steroidal physiological systems in youth BSD, describe the greater literature in adult populations, detail the literature in youth populations when available, and overview current proposed molecular mechanistic pathways and interaction effects based on the available data...
2017: Frontiers in Psychiatry
https://www.readbyqxmd.com/read/29052153/food-for-thought-reward-mechanisms-and-hedonic-overeating-in-obesity
#16
REVIEW
Phong Ching Lee, John B Dixon
PURPOSE OF REVIEW: This review examines the food addiction model and the role of food hedonic pathways in the pathogenesis and treatment of obesity. RECENT FINDINGS: The hedonic pathway interacts with the obesogenic environment to override homeostatic mechanisms to cause increase in body weight. Weight gain sustained over time leads to "upward setting" of defended level of body-fat mass. There are neurobiological and phenotypic similarities and differences between hedonic pathways triggered by food compared with other addictive substances, and the entity of food addiction remains controversial...
December 2017: Current Obesity Reports
https://www.readbyqxmd.com/read/29050504/transgender-research-in-the-21st-century-a-selective-critical-review-from-a-neurocognitive-perspective
#17
Sven C Mueller, Griet De Cuypere, Guy T'Sjoen
Gender dysphoria describes the psychological distress caused by identifying with the sex opposite to the one assigned at birth. In recent years, much progress has been made in characterizing the needs of transgender persons wishing to transition to their preferred gender, thus helping to optimize care. This critical review of the literature examines their common mental health issues, several individual risk factors for psychiatric comorbidity, and current research on the underlying neurobiology. Prevalence rates of persons identifying as transgender and seeking help with transition have been rising steeply since 2000 across Western countries; the current U...
December 1, 2017: American Journal of Psychiatry
https://www.readbyqxmd.com/read/29046149/schizophrenia-and-nicotine-dependence-what-psychopharmacological-treatment-options-are-available-for-the-duo-perturbationes
#18
Yoong Mei Theng, Suzaily Wahab, Noor Alaudin Wahab, Hatta Sidi, Srijit Das
Nicotine dependence has progressively become a foremost community health interest in the both developed and developing nations due to the economic burden and health-related problem. Smoking was significantly higher among patients with schizophrenia in comparison to the general population. Nicotine dependence is not only associated with public stress, but among patients with schizophrenia, smoking brings major challenges to the management. Nicotine may diminish the therapeutic efficacy of the bioavailability of the psychopharmacological agents in-vivo...
October 17, 2017: Current Drug Targets
https://www.readbyqxmd.com/read/29023987/prevalence-of-delusions-in-drug-na%C3%A3-ve-alzheimer-disease-patients-a-meta-analysis
#19
Leo Lai, Philip E Lee, Peter Chan, Mark C Fok, Ging-Yuek R Hsiung, Amir A Sepehry
INTRODUCTION: Neuropsychiatric symptoms (NPS) are common at all stages of Alzheimer disease (AD). Delusions in AD are associated with negative clinical consequences and may signal rapid disease progression. Hence, we sought to determine the prevalence of delusions in drug-naïve (no cholinesterase inhibitor or neuroleptic medications) AD patients. METHODS: In this meta-analysis, a search of the EMBASE, MEDLINE, and PsycINFO databases was performed. We selected studies reporting delusion prevalence measured by the Neuropsychiatric Inventory (NPI) in drug-naïve AD patients...
October 11, 2017: International Journal of Geriatric Psychiatry
https://www.readbyqxmd.com/read/28993868/-dementia-view-of-sufferers-and-their-relatives
#20
REVIEW
Rainer Schaub, Heike von Lützau-Hohlbein
Dementia is the leading cause of cognitive and functional impairment in old age; however, within the scientific community this complex disease is predominantly viewed from a narrow neurobiological and medical perspective, whereas the subjective aspects of dementia, particularly the psychological and social consequences, albeit severe are more or less neglected. In this article the subjective side of experiences of persons with dementia and their relatives are discussed and special aspects of their specific problems and needs during the course of the illness are described...
October 9, 2017: Zeitschrift Für Gerontologie und Geriatrie
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