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https://www.readbyqxmd.com/read/29352103/dynamic-cycling-of-t-snare-acylation-regulates-platelet-exocytosis
#1
Jinchao Zhang, Yunjie Huang, Jing Chen, Haining Zhu, Sidney W Whiteheart
Platelets regulate vascular integrity by secreting a host of molecules that promote hemostasis and its sequelae. Given the importance of platelet exocytosis, it is critical to understand how it is controlled. The t-SNAREs, SNAP-23 and syntaxin-11, lack classical transmembrane domains (TMDs), yet both are associated with platelet membranes and redistributed into cholesterol-dependent, lipid rafts when platelets were activated. Using metabolic labeling and hydroxylamine/HCl (HA) treatment, we showed that both contain thioester-linked acyl groups...
January 19, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29352054/increased-blood-brain-barrier-permeability-in-contralateral-hemisphere-predicts-worse-outcome-in-acute-ischemic-stroke-after-reperfusion-therapy
#2
Chang Liu, Shenqiang Yan, Ruiting Zhang, Zhicai Chen, Feina Shi, Ying Zhou, Meixia Zhang, Min Lou
AIMS: We sought to investigate the risk factors of blood-brain barrier (BBB) disruption, and its potential impact on 90-day clinical outcome in acute ischemic stroke (AIS) patients after reperfusion therapy. METHODS: Consecutive acute anterior circulation AIS patients imaged with computed tomographic perfusion (CTP) before reperfusion therapy were included. Tmax >6 s was used for the volumetric measurement of the hypoperfusion area. BBB permeability (BBBP) was calculated as the average relative permeability-surface area product (rPS) within the hypoperfusion region (rPShypo-i) and its contralateral mirror region (rPShypo-c) on CTP-derived PS color maps...
January 19, 2018: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/29352036/multiple-memory-systems-multiple-time-points-how-science-can-inform-treatment-to-control-the-expression-of-unwanted-emotional-memories
#3
REVIEW
Renée M Visser, Alex Lau-Zhu, Richard N Henson, Emily A Holmes
Memories that have strong emotions associated with them are particularly resilient to forgetting. This is not necessarily problematic, however some aspects of memory can be. In particular, the involuntary expression of those memories, e.g. intrusive memories after trauma, are core to certain psychological disorders. Since the beginning of this century, research using animal models shows that it is possible to change the underlying memory, for example by interfering with its consolidation or reconsolidation...
March 19, 2018: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/29352010/genetics-of-syndromic-and-non-syndromic-mitral-valve-prolapse
#4
REVIEW
Thierry Le Tourneau, Jean Mérot, Antoine Rimbert, Solena Le Scouarnec, Vincent Probst, Hervé Le Marec, Robert A Levine, Jean-Jacques Schott
Mitral valve prolapse (MVP) is a common condition that affects 2%-3% of the general population. MVP is thought to include syndromic forms such as Marfan syndrome and non-syndromic MVP, which is the most frequent form. Myxomatous degeneration and fibroelastic deficiency (FED) are regarded as two different forms of non-syndromic MVP. While FED is still considered a degenerative disease associated with ageing, frequent familial clustering has been demonstrated for myxomatous MVP. Familial and genetic studies led to the recognition of reduced penetrance and large phenotypic variability, and to the identification of prodromal or atypical forms as a part of the complex spectrum of the disease...
January 19, 2018: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/29351899/web-based-survey-application-to-collect-contextually-relevant-geographic-data-with-exposure-times-application-development-and-feasibility-testing
#5
Abby Rudolph, Karin Tobin, Jonathan Rudolph, Carl Latkin
BACKGROUND: Although studies that characterize the risk environment by linking contextual factors with individual-level data have advanced infectious disease and substance use research, there are opportunities to refine how we define relevant neighborhood exposures; this can in turn reduce the potential for exposure misclassification. For example, for those who do not inject at home, injection risk behaviors may be more influenced by the environment where they inject than where they live...
January 19, 2018: JMIR Public Health and Surveillance
https://www.readbyqxmd.com/read/29351881/phonotactic-processing-deficit-following-left-hemisphere-stroke
#6
Maryam Ghaleh, Laura M Skipper-Kallal, Shihui Xing, Elizabeth Lacey, Iain DeWitt, Andrew DeMarco, Peter Turkeltaub
The neural basis of speech processing is still a matter of great debate. Phonotactic knowledge-knowledge of the allowable sound combinations in a language-remains particularly understudied. The purpose of this study was to investigate the brain regions crucial to phonotactic knowledge in left-hemisphere stroke survivors. Results were compared to areas in which gray matter anatomy related to phonotactic knowledge in healthy controls. 44 patients with chronic left-hemisphere stroke, and 32 controls performed an English-likeness rating task on 60 auditory non-words of varying phonotactic regularities...
December 20, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29351872/low-cortical-iron-and-high-entorhinal-cortex-volume-promote-cognitive-functioning-in-the-oldest-old
#7
Jiri M G van Bergen, Xu Li, Frances C Quevenco, Anton F Gietl, Valerie Treyer, Sandra E Leh, Rafael Meyer, Alfred Buck, Philipp A Kaufmann, Roger M Nitsch, Peter C M van Zijl, Christoph Hock, Paul G Unschuld
The aging brain is characterized by an increased presence of neurodegenerative and vascular pathologies. However, there is substantial variation regarding the relationship between an individual's pathological burden and resulting cognitive impairment. To identify correlates of preserved cognitive functioning at highest age, the relationship between β-amyloid plaque load, presence of small vessel cerebrovascular disease (SVCD), iron-burden, and brain atrophy was investigated. Eighty cognitively unimpaired participants (44 oldest-old, aged 85-96 years; 36 younger-old, aged 55-80 years) were scanned by integrated positron emission tomography-magnetic resonance imaging for assessing beta regional amyloid plaque load (18F-flutemetamol), white matter hyperintensities as an indicator of SVCD (fluid-attenuated inversion recovery-magnetic resonance imaging), and iron load (quantitative susceptibility mapping)...
December 20, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/29351428/control-of-appetite-blood-glucose-and-blood-pressure-during-melanocortin-4-receptor-activation-in-normoglycemic-and-diabetic-npy-deficient-mice
#8
Alexandre A da Silva, John Nathan Freeman, John E Hall, Jussara M do Carmo
Although central melanocortin 4 receptor (MC4R) blockade abolishes the CNS-mediated anorexogenic, antidiabetic and cardiovascular actions of leptin, chronic MC4R stimulation fails to completely mimic leptin's effects. Because neuropeptide Y (NPY) and MC4R exert opposite effects on cardiovascular and metabolic functions, we tested its role in offsetting the long-term actions of MC4R activation. Wild-type (WT) and NPY-deficient (NPY-/-) mice were implanted with telemetry probes for measuring mean arterial pressure (MAP) and heart rate (HR) 24-h/d...
December 20, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29351011/a-migratory-divide-in-the-painted-bunting-passerina-ciris
#9
C J Battey, Ethan B Linck, Kevin L Epperly, Cooper French, David L Slager, Paul W Sykes, John Klicka
In the painted bunting (Passerina ciris), a North American songbird, populations on the Atlantic coast and interior southern United States are known to be allopatric during the breeding season, but efforts to map connectivity with wintering ranges have been largely inconclusive. Using genomic and morphological data from museum specimens and banded birds, we found evidence of three genetically differentiated painted bunting populations with distinct wintering ranges and molt-migration phenologies. In addition to confirming that the Atlantic coast population remains allopatric throughout the annual cycle, we identified an unexpected migratory divide within the interior breeding range...
February 2018: American Naturalist
https://www.readbyqxmd.com/read/29350878/perfusion-ct-in-posterior-circulation-stroke-predictors-and-prognostic-implications-of-focal-hypoperfusion
#10
Lars-Peder Pallesen, Dimitris Lambrou, Ashraf Eskandari, Jessica Barlinn, Kristian Barlinn, Heinz Reichmann, Vincent Dunet, Philippe Maeder, Volker Puetz, Patrik Michel
BACKGROUND: We aimed to determine predictors of focal hypoperfusion on CT Perfusion (CTP) in patients with acute posterior circulation stroke and its association with long-term outcome. METHODS: We selected patients with posterior circulation stroke from the Acute STroke Registry and Analysis of Lausanne (ASTRAL) who underwent CTP within 24 hours of stroke onset as part of the stroke imaging protocol. Hypoperfusion was defined as an area of visually well demarcated mean-transit-time (MTT) prolongation corresponding to an arterial territory on standard reconstruction CTP imaging maps...
January 19, 2018: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/29350592/geographic-proximity-to-specialized-pediatric-neurosurgical-care-in-the-contiguous-united-states
#11
Abdul-Kareem Ahmed, Ann-Christine Duhaime, Timothy R Smith
OBJECTIVE Absent from an analysis of supply is consideration of the geographic distribution of pediatric neurosurgeons. Several patient socioeconomic metrics are known to be associated with outcome in pediatric neurosurgical diseases, such as hydrocephalus. The purpose of this study was to determine current geographic proximity to pediatric neurosurgical care using professional society databases. This study also sought to establish how socioeconomic factors are related to distance to care, using federal government-collected data...
January 19, 2018: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/29350085/divergent-classification-methods-of-post-concussion-syndrome-after-mild-traumatic-brain-injury-prevalence-rates-risk-factors-and-functional-outcome
#12
Daphne Cloë Voormolen, Maryse C Cnossen, Suzanne Polinder, Nicole von Steinbuechel, Pieter E Vos, Juanita Antje Haagsma
Mild Traumatic Brian Injury (mTBI) is a common diagnosis and approximately one third of mTBI patients experience a variety of cognitive, emotional, psychosocial and behavioral post-concussion symptoms. When a cluster of these symptoms persists for more than three months they are often classified as post-concussion syndrome (PCS). The objective of this study was to determine prevalence rates, risk factors and functional outcome associated with PCS six months after mTBI applying divergent classification methods...
January 19, 2018: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29349608/comparative-transcriptomics-uncovers-differences-in-photoautotrophic-versus-photoheterotrophic-modes-of-nutrition-in-relation-to-secondary-metabolites-biosynthesis-in-swertia-chirayita
#13
Tarun Pal, Jibesh Kumar Padhan, Pawan Kumar, Hemant Sood, Rajinder S Chauhan
Swertia chirayita is a high-value medicinal herb exhibiting antidiabetic, hepatoprotective, anticancer, antiediematogenic and antipyretic properties. Scarcity of its plant material has necessitated in vitro production of therapeutic metabolites; however, their yields were low compared to field grown plants. Possible reasons for this could be differences in physiological and biochemical processes between plants grown in photoautotrophic versus photoheterotrophic modes of nutrition. Comparative transcriptomes of S...
January 18, 2018: Molecular Biology Reports
https://www.readbyqxmd.com/read/29349538/capturing-pair-wise-epistatic-effects-associated-with-three-agronomic-traits-in-barley
#14
Yi Xu, Yajun Wu, Jixiang Wu
Genetic association mapping has been widely applied to determine genetic markers favorably associated with a trait of interest and provide information for marker-assisted selection. Many association mapping studies commonly focus on main effects due to intolerable computing intensity. This study aims to select several sets of DNA markers with potential epistasis to maximize genetic variations of some key agronomic traits in barley. By doing so, we integrated a MDR (multifactor dimensionality reduction) method with a forward variable selection approach...
January 18, 2018: Genetica
https://www.readbyqxmd.com/read/29349203/neighbourhood-socioeconomic-status-indices-and-early-childhood-development
#15
Simon Webb, Magdalena Janus, Eric Duku, Rob Raos, Marni Brownell, Barry Forer, Martin Guhn, Nazeem Muhajarine
The developmental health of young children is highly influenced by the socioeconomic conditions in which they are raised. How to accurately measure these conditions is a point of debate in the current literature on child development, health, and social determinants. We have evaluated four existing indices of socioeconomic status (SES) to determine the most relevant for the analysis of early childhood development (ECD) in Canada. Following a literature review of published SES indices which used 2006 Canadian Census data, four indices were chosen based on their relevance to ECD and the number of citations in subsequent articles...
December 2017: SSM—Population Health
https://www.readbyqxmd.com/read/29348692/genome-wide-search-for-higher-order-epistasis-as-modifiers-of-treatment-effects-on-bone-mineral-density-in-childhood-cancer-survivors
#16
Cindy Im, Kirsten K Ness, Sue C Kaste, Wassim Chemaitilly, Wonjong Moon, Yadav Sapkota, Russell J Brooke, Melissa M Hudson, Leslie L Robison, Yutaka Yasui, Carmen L Wilson
Single-nucleotide polymorphisms (SNPs) contributing to interactions between regulatory elements that modulate gene transcription may explain some of the uncharacterized variation for complex traits. We explored this hypothesis among 856 adult survivors of pediatric cancer exposed to curative treatments that adversely affect bone mineral density (BMD). To restrict our search to interactions among SNPs in regulatory elements, our analysis considered 75523 SNPs mapped to putative promoter or enhancer regions. In anticipation that power to detect higher order epistasis would be low using an exhaustive search and a Bonferroni-corrected threshold for genome-wide significance (e...
January 18, 2018: European Journal of Human Genetics: EJHG
https://www.readbyqxmd.com/read/29347914/in-depth-proteomic-analysis-of-boar-spermatozoa-through-shotgun-and-gel-based-methods
#17
Jean M Feugang, Shengfa F Liao, Scott T Willard, Peter L Ryan
BACKGROUND: Mature spermatozoa contain numerous epididymal and seminal plasma proteins, which full identification through high-throughput technologies may allow for a better understanding of the sperm biology. Therefore, we conducted a global proteomic analysis of boar spermatozoa through shotgun and gel-based methodologies. RESULTS: The total proteins were extracted from mature spermatozoa and subjecsted to proteome analyses. Functional analyses of gene ontology representations and pathway enrichments were conducted on the shotgun dataset, followed by immunology and gene expression validations...
January 18, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29347608/mapping-and-discrimination-of-networks-in-the-complexity-entropy-plane
#18
Marc Wiedermann, Jonathan F Donges, Jürgen Kurths, Reik V Donner
Complex networks are usually characterized in terms of their topological, spatial, or information-theoretic properties and combinations of the associated metrics are used to discriminate networks into different classes or categories. However, even with the present variety of characteristics at hand it still remains a subject of current research to appropriately quantify a network's complexity and correspondingly discriminate between different types of complex networks, like infrastructure or social networks, on such a basis...
October 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347485/mixing-and-transport-from-combined-stretching-and-folding-and-cutting-and-shuffling
#19
Lachlan D Smith, Paul B Umbanhowar, Julio M Ottino, Richard M Lueptow
While structures and bifurcations controlling tracer particle transport and mixing have been studied extensively for systems with only stretching-and-folding, and to a lesser extent for systems with only cutting-and-shuffling, few studies have considered systems with a combination of both. We demonstrate two bifurcations for nonmixing islands associated with elliptic periodic points that only occur in systems with combined cutting-and-shuffling and stretching-and-folding, using as an example a map approximating biaxial rotation of a less-than-half-full spherical granular tumbler...
October 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347394/linking-biological-and-physical-aging-dynamical-scaling-of-multicellular-regeneration
#20
Yuting Lou, Jufeng Xia, Wei Tang, Yu Chen
The fight against biological aging (bio-aging) is long-standing, with the focus of intense research aimed at maintaining high rates of tissue regeneration to promote health and longevity. Nevertheless, there are overwhelming complexities associated with the quantitative analysis of aging. In this study, we sought to quantify bio-aging based on physical aging, by mapping instances of multicellular regeneration to the relaxation of physical systems. An experiment of delayed wound healing assays was devised to obtain delay-dependent healing data...
December 2017: Physical Review. E
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