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https://www.readbyqxmd.com/read/28938472/dopamine-neuron-restricted-leptin-receptor-lepr-signaling-reduces-some-aspects-of-food-reward-but-exacerbates-the-obesity-of-lepr-deficient-male-mice
#1
Maggie C Evans, Greg M Anderson
The contribution of leptin-induced modulation of dopamine neurons to feeding behavior and energy homeostasis remains unclear. Midbrain dopamine neurons regulate the reward value of food, and direct leptin administration to the midbrain reduces food intake. However, selective deletion of leptin receptors (Lepr) from dopamine neurons has no effect on body weight, food intake or hedonic responses, either suggesting leptin acts indirectly or demonstrating sufficient compensation occurs to mask any direct leptin-dopamine effects...
August 18, 2017: Endocrinology
https://www.readbyqxmd.com/read/28938181/cortical-inhibitory-interneurons-control-sensory-processing
#2
REVIEW
Katherine C Wood, Jennifer M Blackwell, Maria Neimark Geffen
Inhibitory and excitatory neurons form intricate interconnected circuits in the mammalian sensory cortex. Whereas the function of excitatory neurons is largely to integrate and transmit information within and between brain areas, inhibitory neurons are thought to shape the way excitatory neurons integrate information, and they exhibit context-specific and behavior-specific responses. Over the last few years, work across sensory modalities has begun unraveling the function of distinct types of cortical inhibitory neurons in sensory processing, identifying their contribution to controlling stimulus selectivity of excitatory neurons and modulating information processing based on the behavioral state of the subject...
September 19, 2017: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/28938176/genotypic-differences-in-physiological-and-biochemical-responses-to-salinity-stress-in-melon-cucumis-melo-l-plants-prospects-for-selection-of-salt-tolerant-landraces
#3
Behrooz Sarabi, Sahebali Bolandnazar, Nasser Ghaderi, Jaleh Ghashghaie
Melon (Cucumis melo L.) is one of the most important horticultural crops in Iran often cultivated in arid and semiarid regions of the country with salinity problems. The objective of this work was to better understand the mechanisms of physiological and biochemical responses to salinity stress of five Iranian melon landraces "Samsuri", "Kashan", "Khatouni", "Suski-e-Sabz", and "Ghobadlu" from different geographical origins, and "Galia" F1 cultivar. Plants were grown under greenhouse conditions and irrigated with half-strength Hoagland solution containing 0, 30, 60, or 90 mM NaCl for 60 days...
September 13, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28938055/photosynthetic-phenological-variation-may-promote-coexistence-among-co-dominant-tree-species-in-a-madrean-sky-island-mixed-conifer-forest
#4
D L Potts, R L Minor, Z Braun, G A Barron-Gafford
Across much of western North America, forests are predicted to experience a transition from snow- to rain-dominated precipitation regimes due to anthropogenic climate warming. Madrean sky island mixed conifer forests receive a large portion of their precipitation from summertime convective storms and may serve as a lens into the future for snow-dominated forests after prolonged warming. To better understand the linkage between physiological traits, climate variation, and the structure and function of mixed conifer forests, we measured leaf photosynthetic (A) responses to controlled variation in internal CO2 concentration (Ci) to quantify interspecific phenological variation in A/Ci-derived ecophysiological traits among ponderosa pine (Pinus ponderosa Lawson and C...
September 1, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28937978/a-new-discrete-dynamic-model-of-aba-induced-stomatal-closure-predicts-key-feedback-loops
#5
Réka Albert, Biswa R Acharya, Byeong Wook Jeon, Jorge G T Zañudo, Mengmeng Zhu, Karim Osman, Sarah M Assmann
Stomata, microscopic pores in leaf surfaces through which water loss and carbon dioxide uptake occur, are closed in response to drought by the phytohormone abscisic acid (ABA). This process is vital for drought tolerance and has been the topic of extensive experimental investigation in the last decades. Although a core signaling chain has been elucidated consisting of ABA binding to receptors, which alleviates negative regulation by protein phosphatases 2C (PP2Cs) of the protein kinase OPEN STOMATA 1 (OST1) and ultimately results in activation of anion channels, osmotic water loss, and stomatal closure, over 70 additional components have been identified, yet their relationships with each other and the core components are poorly elucidated...
September 22, 2017: PLoS Biology
https://www.readbyqxmd.com/read/28937960/prenatal-exposure-to-nonpersistent-endocrine-disruptors-and-behavior-in-boys-at-3-and-5-years
#6
Claire Philippat, Dorothy Nakiwala, Antonia M Calafat, Jérémie Botton, Maria De Agostini, Barbara Heude, Rémy Slama
BACKGROUND: Sex-specific associations have been reported between phthalates, bisphenol A (BPA), and child behavior. No data on large study populations are available for other phenols with possible endocrine-disrupting properties. OBJECTIVES: We aimed to study associations between prenatal exposure to phthalates and several phenols on behavior among male infants. METHODS: We quantified 11 phthalate metabolites and nine phenols (four parabens, benzophenone-3, BPA, two dichlorophenols, triclosan) in spot urine samples collected during pregnancy among EDEN cohort mothers who delivered a boy...
September 15, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28937914/collective-psychological-ownership-and-intergroup-relations
#7
Maykel Verkuyten, Borja Martinovic
Whereas much social psychological research has studied the in-group and out-group implications of social categorization and collective identity ("we"), little research has examined the nature and relevance of collective psychological ownership ("ours") for intergroup relations. We make a case for considering collective psychological ownership as an important source of intergroup tensions. We do so by integrating theory and research from various social sciences, and we draw out implications for future social psychological research on intergroup relations...
September 1, 2017: Perspectives on Psychological Science: a Journal of the Association for Psychological Science
https://www.readbyqxmd.com/read/28937814/comparative-analyses-of-phenotypic-trait-covariation-within-and-among-populations
#8
Kathryn S Peiman, Beren W Robinson
Many morphological, behavioral, physiological, and life-history traits covary across the biological scales of individuals, populations, and species. However, the processes that cause traits to covary also change over these scales, challenging our ability to use patterns of trait covariance to infer process. Trait relationships are also widely assumed to have generic functional relationships with similar evolutionary potentials, and even though many different trait relationships are now identified, there is little appreciation that these may influence trait covariation and evolution in unique ways...
October 2017: American Naturalist
https://www.readbyqxmd.com/read/28937653/differential-functional-roles-of-aldh1a1-and-aldh1a3-in-mediating-metastatic-behavior-and-therapy-resistance-of-human-breast-cancer-cells
#9
Alysha K Croker, Mauricio Rodriguez-Torres, Ying Xia, Siddika Pardhan, Hon Sing Leong, John D Lewis, Alison L Allan
Previous studies indicate that breast cancer cells with high aldehyde dehydrogenase (ALDH) activity and CD44 expression (ALDH(hi)CD44⁺) contribute to metastasis and therapy resistance, and that ALDH1 correlates with poor outcome in breast cancer patients. The current study hypothesized that ALDH1 functionally contributes to breast cancer metastatic behavior and therapy resistance. Expression of ALDH1A1 or ALDH1A3 was knocked down in MDA-MB-468 and SUM159 human breast cancer cells using siRNA. Resulting impacts on ALDH activity (Aldefluor(®) assay); metastatic behavior and therapy response in vitro (proliferation/adhesion/migration/colony formation/chemotherapy and radiation) and extravasation/metastasis in vivo (chick choroiallantoic membrane assay) was assessed...
September 22, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28937579/pyrethroids-inhibit-k2p-channels-and-activate-sensory-neurons-basis-of-insecticide-induced-paraesthesias
#10
Aida Castellanos, Alba Andres, Laura Bernal, Gerard Callejo, Nuria Comes, Arcadi Gual, Jonathan P Giblin, Carolina Roza, Xavier Gasull
Pyrethroid insecticides are widely used for pest control, in agriculture or in human public health commonly as a topical treatment for scabies and head lice. Exposure to pyrethroids such as permethrin or tetramethrin (TM) causes sensory alterations such as transient pain, burning, stinging sensations and paraesthesias. Despite the well-known effects of pyrethroids on sodium channels, actions on other channels that control sensory neuron excitability are less studied. Given the role of two-pore domain potassium (K2P) channels in modulating sensory neuron excitability and firing, both in physiological and pathological conditions, we examined the effect of pyrethroids on K2P channels mainly expressed in sensory neurons...
September 19, 2017: Pain
https://www.readbyqxmd.com/read/28937371/npm1-and-flt3-mutations-in-acute-myeloid-leukemia-with-normal-karyotype-indian-perspective
#11
Sudha Sazawal, Neha Singh, Sonal Jain, Sunita Chhikara, Rekha Chaubey, Jina Bhattacharyya, Kandarpa Kr Saikia, Manoranjan Mahapatra, Renu Saxena
BACKGROUND: FLT3-ITD and NPM1 mutations are considered to be the major determinants of the patient response to therapy and outcome. The primary aim of this study was to establish the correlation between these molecular mutations and the clinico-hematologic parameters as well as the prognostic outcome of the Indian acute myeloid leukemia (AML) patients. MATERIALS AND METHODS: This prospective study involved newly diagnosed nonpromyelocytic AML patients who had undergone complete diagnostic workup, including immunophenotyping, conventional cytogenetics and molecular analysis for NPM1 and FLT3-ITD mutation by reverse transcriptase polymerase chain reaction at presentation...
July 2017: Indian Journal of Pathology & Microbiology
https://www.readbyqxmd.com/read/28937316/age-dependent-responses-of-brain-myelin-integrity-and-behavioral-performance-to-radiation-in-mice
#12
Zhimeng Fu, Yunfei Zhao, Kaixiang Zhang, Jian Wang, Min Zhang, Xianghui Zhao
Radiation therapy is widely used to treat primary and metastatic brain tumors, but it may also lead to delayed neurological complications. Oligodendrocytes in the central nervous system produce myelin, and myelin integrity becomes highly vulnerable after brain irradiation. In this study, mice at different developmental stages were used to test the age-dependent sensitivity of myelin formation and maintenance, as well as behavioral performance after whole-brain irradiation (WBI). Mice at postnatal days 21 and 28 and at 2 months received a single dose of 25 Gy WBI...
September 22, 2017: Radiation Research
https://www.readbyqxmd.com/read/28937300/infants-processing-of-prosodic-cues-electrophysiological-evidence-for-boundary-perception-beyond-pause-detection
#13
Julia Holzgrefe-Lang, Caroline Wellmann, Barbara Höhle, Isabell Wartenburger
Infants as young as six months are sensitive to prosodic phrase boundaries marked by three acoustic cues: pitch change, final lengthening, and pause. Behavioral studies suggest that a language-specific weighting of these cues develops during the first year of life; recent work on German revealed that eight-month-olds, unlike six-month-olds, are capable of perceiving a prosodic boundary on the basis of pitch change and final lengthening only. The present study uses Event-Related Potentials (ERPs) to investigate the neuro-cognitive development of prosodic cue perception in German-learning infants...
September 1, 2017: Language and Speech
https://www.readbyqxmd.com/read/28937282/development-and-implementation-of-nutrition-education-on-dietary-diversification-for-primary-school-children
#14
Vanessa Hlekani Mbhatsani, Xikombiso G Mbhenyane, Solomon Ngoako Mabapa
A quasi-experimental one group pretest/posttest design study was undertaken in two primary schools from two rural villages of Vhembe District in Limpopo Province, South Africa. About 172 children aged 9-14 years in Grades 5 and 6 were recruited for the study. All children in the grades were invited to participate pending written consent from parents and verbal assent from children. Due to school migration and absenteeism, only 154 children were available for posttest evaluation. However, nutrition education was administered to all 172 children...
September 22, 2017: Ecology of Food and Nutrition
https://www.readbyqxmd.com/read/28937233/new-perspectives-in-the-model-of-stress-response
#15
I Tonhajzerova, M Mestanik
The reactions of human organism to changes of internal or external environment termed as stress response have been at the center of interest during recent decades. Several theories were designed to describe the regulatory mechanisms which maintain the stability of vital physiological functions under conditions of threat or other environmental challenges. However, most of the models of stress reactivity were focused on specific aspects of the regulatory outcomes - physiological (e.g. neuroendocrine), psychological or behavioral regulation...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28936735/dual-behavior-of-exosomes-in-septic-cardiomyopathy
#16
Valter Vinícius Silva Monteiro, Jordano Ferreira Reis, Rafaelli de Souza Gomes, Kely Campos Navegantes, Marta Chagas Monteiro
Sepsis is one of the main causes of ICU hospitalization worldwide, with a high mortality rate, and is associated with a large number of comorbidities. One of the main comorbidities associated with sepsis is septic cardiomyopathy. This process occurs mainly due to mechanisms of damage in the cardiovascular system that will lead to changes in cardiovascular physiology, such as decreased Ca(2+) response, mitochondrial dysfunction and decreased β-adrenergic receptor response. Within this process the exosomes play an important role in the pathophysiology of this disease, in which the exosomal content is related to mechanisms that will trigger its development...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28936725/ampa-receptors-at-ribbon-synapses-in-the-mammalian-retina-kinetic-models-and-molecular-identity
#17
Espen Hartveit, Bas-Jan Zandt, Eirik Madsen, Áurea Castilho, Svein Harald Mørkve, Margaret Lin Veruki
In chemical synapses, neurotransmitter molecules released from presynaptic vesicles activate populations of postsynaptic receptors that vary in functional properties depending on their subunit composition. Differential expression and localization of specific receptor subunits are thought to play fundamental roles in signal processing, but our understanding of how that expression is adapted to the signal processing in individual synapses and microcircuits is limited. At ribbon synapses, glutamate release is independent of action potentials and characterized by a high and rapidly changing rate of release...
September 21, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28936362/albumin-protein-cleavage-affects-the-wear-and-friction-of-ultra-high-molecular-weight-polyethylene
#18
Yasha Dwivedi, Michel P Laurent, Shravan Sarvepalli, Thomas M Schmid, Markus A Wimmer
It is well established that the total protein concentration and albumin-to-globulin ratio influence the wear of ultra-high molecular polyethylene (UHMWPE, "polyethylene") in joint prostheses. A factor on wear not yet studied, but of possible clinical relevance, is protein cleavage. Such cleavage is expected in the presence of an inflammatory response and as a result of wear processes at the articular interface. The aim of this study was to compare the tribological behavior of polyethylene articulated against an orthopedic wrought CoCrMo alloy for three lubricants: cleaved albumin, uncleaved albumin, and newborn calf serum (control)...
September 2017: Lubricants
https://www.readbyqxmd.com/read/28936227/hospital-nurses-attitudes-negative-perceptions-and-negative-acts-regarding-workplace-bullying
#19
Shu-Ching Ma, Hsiu-Hung Wang, Tsair-Wei Chien
BACKGROUND: Workplace bullying is a prevalent problem in today's work places that has adverse effects on both bullying victims and organizations. To investigate the predictors of workplace bullying is an important task to prevent bullying victims of nurses in hospitals. OBJECTIVE: This study aims to explore the relationships among nurses' attitudes, negative perceptions, and negative acts regarding workplace bullying under the framework of the theory of planned behavior (TPB)...
2017: Annals of General Psychiatry
https://www.readbyqxmd.com/read/28936161/oxidative-stress-modifies-the-levels-and-phosphorylation-state-of-tau-protein-in-human-fibroblasts
#20
Alejandro Ibáñez-Salazar, Bernardo Bañuelos-Hernández, Ildefonso Rodríguez-Leyva, Erika Chi-Ahumada, Elizabeth Monreal-Escalante, María E Jiménez-Capdeville, Sergio Rosales-Mendoza
Since the tau protein is closely involved in the physiopathology of Alzheimer's disease (AD), studying its behavior in cellular models might lead to new insights on understanding this devastating disease at molecular levels. In the present study, primary cultures of human fibroblasts were established and used to determine the expression and localization of the tau protein in distinct phosphorylation states in both untransfected and tau gene-transfected cells subjected to oxidative stress. Higher immunopositivity to phospho-tau was observed in cell nuclei in response to oxidative stress, while the levels of total tau in the cytosol remained unchanged...
2017: Frontiers in Neuroscience
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