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Biological basis of depress*

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https://www.readbyqxmd.com/read/27993607/a-biological-perspective-on-differences-and-similarities-between-burnout-and-depression
#1
REVIEW
Ariane Orosz, Andrea Federspiel, Sarie Haisch, Christian Seeher, Thomas Dierks, Katja Cattapan
To compare and contrast burnout and depression is not only a conceptual issue, but may deliver important directions for treatment approaches and stabilize the awareness of disease which is essential for affected individuals. Because of the symptomatic overlap, it is a subject of multidimensional research and discussion to find specific signatures to differentiate between the two phenomena or to present evidence that they are different aspects of the same disorder. Both pathologies are regarded as stress-related disorders...
December 16, 2016: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/27991805/understanding-the-neural-basis-of-cognitive-bias-modification-as-a-clinical-treatment-for-depression
#2
Akihiro Eguchi, Daniel Walters, Nele Peerenboom, Hannah Dury, Elaine Fox, Simon Stringer
OBJECTIVE: Cognitive bias modification (CBM) eliminates cognitive biases toward negative information and is efficacious in reducing depression recurrence, but the mechanisms behind the bias elimination are not fully understood. The present study investigated, through computer simulation of neural network models, the neural dynamics underlying the use of CBM in eliminating the negative biases in the way that depressed patients evaluate facial expressions. METHOD: We investigated 2 new CBM methodologies using biologically plausible synaptic learning mechanisms-continuous transformation learning and trace learning-which guide learning by exploiting either the spatial or temporal continuity between visual stimuli presented during training...
December 19, 2016: Journal of Consulting and Clinical Psychology
https://www.readbyqxmd.com/read/27989405/aberrant-default-mode-network-homogeneity-in-patients-with-first-episode-treatment-naive-melancholic-depression
#3
Xilong Cui, Wenbin Guo, Yi Wang, Tian-Xiao Yang, Xin-Hua Yang, Yefei Wang, Jingbo Gong, Changlian Tan, Guangrong Xie
BACKGROUND: Melancholic depression is a relatively homogenous subtype of major depressive disorders (MDD). The condition has several endogenous symptoms and represents strong biological components. However, its specific neurobiological mechanisms remain unknown. Previous neuroimaging findings indicated that default mode network (DMN) is closely related to MDD. The present study examined the network homogeneity (NH) of the DMN in patients with melancholic MDD. METHODS: A total of 33 first-episode, treatment-naive melancholic MDD patients and 32 healthy controls underwent a resting-state functional magnetic resonance imaging scan...
February 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/27977069/biological-mechanism-of-post-herpetic-neuralgia-evidence-from-multiple-patho-psychophysiological-measures
#4
W W Peng, X L Guo, Q Q Jin, H Wei, X L Xia, Y Zhang, P C Huang, W C Wang, S L Li, J S Wang, J Chen, L Hu
BACKGROUND: Post-herpetic neuralgia (PHN), which develops after the resolution of a herpes zoster eruption, is an exceptionally drug-resistant neuropathic pain. The unsatisfactory management of PHN partly results from the difficulty in dissecting out its contributing factors due to the complexity of PHN mechanism. METHODS: Here, to elaborate our understanding of the PHN mechanism and to establish a basis for effective therapeutic strategies, we comprehensively investigated the contributions of multiple factors to PHN severity...
December 15, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27956745/altered-brain-processing-of-decision-making-in-healthy-first-degree-biological-relatives-of-suicide-completers
#5
Y Ding, F Pereira, A Hoehne, M-M Beaulieu, M Lepage, G Turecki, F Jollant
Suicidal behavior is heritable, with the transmission of risk being related to the transmission of vulnerability traits. Previous studies suggest that risky decision-making may be an endophenotype of suicide. Here, we aimed at investigating brain processing of decision-making in relatives of suicide completers in order to shed light on heritable mechanisms of suicidal vulnerability. Seventeen healthy first-degree biological relatives of suicide completers with no personal history of suicidal behavior, 16 relatives of depressed patients without any personal or family history of suicidal behavior, and 19 healthy controls were recruited...
December 13, 2016: Molecular Psychiatry
https://www.readbyqxmd.com/read/27955897/orexins-mediate-sex-differences-in-the-stress-response-and-in-cognitive-flexibility
#6
Laura A Grafe, Amanda Cornfeld, Sandra Luz, Rita Valentino, Seema Bhatnagar
BACKGROUND: Women are twice as likely as men to experience stress-related psychiatric disorders. The biological basis of these sex differences is poorly understood. Orexins are altered in anxious and depressed patients. Using a rat model of repeated stress, we examined whether orexins contribute to sex differences in outcomes relevant to stress-related psychiatric diseases. METHODS: Behavioral, neural, and endocrine habituation to repeated restraint stress and subsequent cognitive flexibility was examined in adult male and female rats...
October 18, 2016: Biological Psychiatry
https://www.readbyqxmd.com/read/27717262/abandoning-personalization-to-get-to-precision-in-the-pharmacotherapy-of-depression
#7
Roy H Perlis
Effectiveness studies and analyses of naturalistic cohorts demonstrate that many patients with major depressive disorder do not experience symptomatic remission with antidepressant treatments. In an effort to better match patients with effective treatments, numerous investigations of predictors or moderators of treatment response have been reported over the past five decades, including clinical features as well as biological measures. However, none of these have entered routine clinical practice; instead, clinicians typically personalize treatment on the basis of patient preferences as well as their own...
October 2016: World Psychiatry: Official Journal of the World Psychiatric Association (WPA)
https://www.readbyqxmd.com/read/27641441/gut-instincts-microbiota-as-a-key-regulator-of-brain-development-ageing-and-neurodegeneration
#8
Timothy G Dinan, John F Cryan
There is a growing realisation that the gut-brain axis and its regulation by the microbiota may play a key role in the biological and physiological basis of neurodevelopmental, age-related and neurodegenerative disorders. The routes of communication between the microbiota and brain are being unravelled and include the vagus nerve, gut hormone signalling, the immune system, tryptophan metabolism or by way of microbial metabolites such as short chain fatty acids. The importance of early life gut microbiota in shaping future health outcomes is also emerging...
January 15, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/27629369/genome-wide-association-study-of-loneliness-demonstrates-a-role-for-common-variation
#9
Jianjun Gao, Lea K Davis, Amy B Hart, Sandra Sanchez-Roige, Lide Han, John T Cacioppo, Abraham A Palmer
Loneliness is a complex biological trait that has been associated with numerous negative health outcomes. The measurement and environmental determinants of loneliness are well understood, but its genetic basis is not. Previous studies have estimated the heritability of loneliness between 37 and 55% using twins and family-based approaches, and have explored the role of specific candidate genes. We used genotypic and phenotypic data from 10 760 individuals aged ⩾50 years that were collected by the Health and Retirement Study (HRS) to perform the first genome-wide association study of loneliness...
October 12, 2016: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27616990/locus-ceruleus-norepinephrine-release-a-central-regulator-of-cns-spatio-temporal-activation
#10
Marco Atzori, Roberto Cuevas-Olguin, Eric Esquivel-Rendon, Francisco Garcia-Oscos, Roberto C Salgado-Delgado, Nadia Saderi, Marcela Miranda-Morales, Mario Treviño, Juan C Pineda, Humberto Salgado
Norepinephrine (NE) is synthesized in the Locus Coeruleus (LC) of the brainstem, from where it is released by axonal varicosities throughout the brain via volume transmission. A wealth of data from clinics and from animal models indicates that this catecholamine coordinates the activity of the central nervous system (CNS) and of the whole organism by modulating cell function in a vast number of brain areas in a coordinated manner. The ubiquity of NE receptors, the daunting number of cerebral areas regulated by the catecholamine, as well as the variety of cellular effects and of their timescales have contributed so far to defeat the attempts to integrate central adrenergic function into a unitary and coherent framework...
2016: Frontiers in Synaptic Neuroscience
https://www.readbyqxmd.com/read/27612656/systems-biology-integration-of-proteomic-data-in-rodent-models-of-depression-reveals-involvement-of-the-immune-response-and-glutamatergic-signaling
#11
Lucia Carboni, Thanh-Phuong Nguyen, Laura Caberlotto
PURPOSE: The pathophysiological basis of major depression is incompletely understood. Recently, numerous proteomic studies have been performed in rodent models of depression to investigate the molecular underpinnings of depressive-like behaviours with an unbiased approach. The objective of the study is to integrate the results of these proteomic studies in depression models to shed light on the most relevant molecular pathways involved in the disease. EXPERIMENTAL DESIGN: Network analysis is performed integrating preexisting proteomic data from rodent models of depression...
December 2016: Proteomics. Clinical Applications
https://www.readbyqxmd.com/read/27609760/previous-motor-activity-affects-the-transition-from-uncertainty-to-decision-making-in-snails
#12
Tatiana A Korshunova, Dmitry D Vorontsov, Varvara E Dyakonova
One of the most widely accepted benefits of enhanced physical activity is an improvement in the symptoms of depression, including the facilitation of decision making. Up until now, these effects have been shown in rodents and humans only. Little is known about their evolutionary origin or biological basis, and the underlying cellular mechanisms also remain relatively elusive. Here, we demonstrate for the first time that preceding motor activity accelerates decision making in an invertebrate, the pond snail Lymnaea stagnalis To investigate decision making in a novel environment, snails, which normally live in water, were placed on a flat dry surface to simulate the potentially threatening consequence of being in an arid environment...
November 15, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27567807/a-decade-of-cerebrospinal-fluid-biomarkers-for-alzheimer-s-disease-in-belgium
#13
Charisse Somers, Hanne Struyfs, Joery Goossens, Ellis Niemantsverdriet, Jill Luyckx, Naomi De Roeck, Ellen De Roeck, Bart De Vil, Patrick Cras, Jean-Jacques Martin, Peter-Paul De Deyn, Maria Bjerke, Sebastiaan Engelborghs
During the past ten years, over 5,000 cerebrospinal fluid (CSF) samples were analyzed at the Reference Center for Biological Markers of Dementia (BIODEM), UAntwerp, for core Alzheimer's disease (AD) CSF biomarkers: amyloid-β peptide of 42 amino acids (Aβ1-42), total tau protein (T-tau), and tau phosphorylated at threonine 181 (P-tau181P). CSF biomarker analyses were performed using single-analyte ELISA kits. In-house validated cutoff values were applied: Aβ1-42 <638.5 pg/mL, T-tau >296.5 pg/mL, P-tau181P >56...
August 10, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/27559167/partial-breakdown-of-input-specificity-of-stdp-at-individual-synapses-promotes-new-learning
#14
Maxim Volgushev, Jen-Yung Chen, Vladimir Ilin, Roman Goz, Marina Chistiakova, Maxim Bazhenov
UNLABELLED: Hebbian-type learning rules, which underlie learning and refinement of neuronal connectivity, postulate input specificity of synaptic changes. However, theoretical analyses have long appreciated that additional mechanisms, not restricted to activated synapses, are needed to counteract positive feedback imposed by Hebbian-type rules on synaptic weight changes and to achieve stable operation of learning systems. The biological basis of such mechanisms has remained elusive. Here we show that, in layer 2/3 pyramidal neurons from slices of visual cortex of rats, synaptic changes induced at individual synapses by spike timing-dependent plasticity do not strictly follow the input specificity rule...
August 24, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27481553/shaping-emotion-regulation-attunement-symptomatology-and-stress-recovery-within-mother-infant-dyads
#15
Brendan D Ostlund, Jeffrey R Measelle, Heidemarie K Laurent, Elisabeth Conradt, Jennifer C Ablow
The foundations of emotion regulation are organized, in part, through repeated interactions with one's caregiver in infancy. Less is known about how stress physiology covaries between a mother and her infant within these interactions, leaving a gap in our understanding of how the biological basis of emotion regulation develops. This study investigated physiological attunement between mothers and their 5-month-old infants, as well as the influence of maternal depression and anxiety, during stress recovery. During the reengagement phase of the Still Face Paradigm, mother-infant dyads exhibited negative attunement, as measured by inverse covariation of respiratory sinus arrhythmia (RSA)...
January 2017: Developmental Psychobiology
https://www.readbyqxmd.com/read/27440233/preliminary-assessment-of-pre-morbid-dna-methylation-in-individuals-at-high-genetic-risk-of-mood-disorders
#16
Rosie May Walker, Jessika Elizabeth Sussmann, Heather Clare Whalley, Niamh Margaret Ryan, David John Porteous, Andrew Mark McIntosh, Kathryn Louise Evans
OBJECTIVES: Accumulating evidence implicates altered DNA methylation in psychiatric disorders, including bipolar disorder (BD) and major depressive disorder (MDD). It is not clear, however, whether these changes are causative or result from illness progression or treatment. To disentangle these possibilities we profiled genome-wide DNA methylation in well, unrelated individuals at high familial risk of mood disorder. DNA methylation was compared between individuals who subsequently developed BD or MDD [ill later (IL)] and those who remained well [well later (WL)]...
August 2016: Bipolar Disorders
https://www.readbyqxmd.com/read/27428458/comparison-of-the-in-vitro-metabolism-of-psoralidin-among-different-species-and-characterization-of-its-inhibitory-effect-against-udp-glucuronosyltransferase-ugt-or-cytochrome-p450-cyp450-enzymes
#17
Xianbao Shi, Gang Zhang, Brianna Mackie, Shuman Yang, Jian Wang, Lina Shan
Psoralidin has shown a variety of biological and pharmacological activities such as anti-tumor anti-oxidant, anti-bacterial, anti-depressant and anti-inflammatory activities. Herein, we reported the metabolism of psoralidin among different species and its inhibitory effect against UGTs and CYP450s. Liquid chromatography was used to investigate the inhibitory activity of psoralidin against ten different UGTs and eight distinct CYP450 isoforms. In addition, we characterized the CYP450 isoforms involved in the psoralidin metabolism on the basis of chemical inhibition studies and screening assays with recombinant human cytochrome P450s...
September 1, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27377417/psychiatric-disorders-biochemical-pathways-unraveled-by-human-brain-proteomics
#18
REVIEW
Verônica M Saia-Cereda, Juliana S Cassoli, Daniel Martins-de-Souza, Juliana M Nascimento
Approximately 25 % of the world population is affected by a mental disorder at some point in their life. Yet, only in the mid-twentieth century a biological cause has been proposed for these diseases. Since then, several studies have been conducted toward a better comprehension of those disorders, and although a strong genetic influence was revealed, the role of these genes in disease mechanism is still unclear. This led most recent studies to focus on the molecular basis of mental disorders. One line of investigation that has risen in the post-genomic era is proteomics, due to its power of revealing proteins and biochemical pathways associated with biological systems...
February 2017: European Archives of Psychiatry and Clinical Neuroscience
https://www.readbyqxmd.com/read/27375045/sex-differences-in-the-effects-of-social-defeat-on-brain-and-behavior-in-the-california-mouse-insights-from-a-monogamous-rodent
#19
REVIEW
Michael Q Steinman, Brian C Trainor
Women are nearly twice as likely as men to be diagnosed with major depressive disorder, yet the use of female animal models in studying the biological basis of depression lags behind that of males. The social defeat model uses social stress to generate depression-like symptoms in order to study the neurobiological mechanisms. In general, social defeat is difficult to apply in female rodents. However, male and female California mice (Peromyscus californicus) are territorial. This allows defeat to be studied in both sexes...
January 2017: Seminars in Cell & Developmental Biology
https://www.readbyqxmd.com/read/27342631/prefrontal-inositol-levels-and-implicit-decision-making-in-healthy-individuals-and-depressed-patients
#20
Fabrice Jollant, Stéphane Richard-Devantoy, Yang Ding, Gustavo Turecki, Antoine Bechara, Jamie Near
Risky decision-making is found in several mental disorders and is associated with deleterious consequences. Current research aims at understanding the biological underpinnings of this complex cognitive function and the basis of individual variability. We used 3T proton Magnetic Resonance Spectroscopy to measure in vivo glutamate, GABA, N-acetyl-aspartate (NAA), and myo-inositol levels at rest in the right dorsal prefrontal cortex of 54 participants, comprising 24 unmedicated depressed patients and 30 healthy individuals...
August 2016: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
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