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Motomu Endo, Masayasu Yoshida, Youhei Sasaki, Katsuya Negishi, Kobo Horikawa, Yasufumi Daimon, Ken-Ichi Kurotani, Michitaka Notaguchi, Mitsutomo Abe, Takashi Araki
In many plants, timing of flowering is regulated by day length. In Arabidopsis, florigen, FLOWERING LOCUS T (FT) protein, is synthesized in leaf phloem companion cells in response to long days and is transported to the shoot apical meristem (SAM) through the phloem. The temporal aspects of florigen transportation have been studied in various plants by physiological experiments. Nevertheless, little is known how FT protein transportation is regulated in Arabidopsis. In this study, we performed heat-shock based transient FT induction in a single leaf blade and detected the FT protein in shoot apex by two-dimensional polyacrylamide gel electrophoresis (2D-PAGE)...
March 19, 2018: Plant & Cell Physiology
William H Curley, Peter B Forgacs, Henning U Voss, Mary M Conte, Nicholas D Schiff
Patients with severe brain injury are difficult to assess and frequently subject to misdiagnosis. 'Cognitive motor dissociation' is a term used to describe a subset of such patients with preserved cognition as detected with neuroimaging methods but not evident in behavioural assessments. Unlike the locked-in state, cognitive motor dissociation after severe brain injury is prominently marked by concomitant injuries across the cerebrum in addition to limited or no motoric function. In the present study, we sought to characterize the EEG signals used as indicators of cognition in patients with disorders of consciousness and examine their reliability for potential future use to re-establish communication...
March 19, 2018: Brain: a Journal of Neurology
Ulrike Bechtold, John N Ferguson, Philip M Mullineaux
The emergence of Arabidopsis as a model species and the availability of genetic and genomic resources have resulted in the identification and detailed characterisation of abiotic stress signalling pathways. However, this has led only to limited success in engineering abiotic stress tolerance in crops. This is because there needs to be a deeper understanding in how to combine resistances to a range of stresses with growth and productivity. The natural variation and genomic resources of Arabidopsis thaliana (Arabidopsis) is a great asset to understand the mechanisms of multiple stress tolerances...
March 17, 2018: Journal of Experimental Botany
Alicia Donnellan Barraclough, Roman Zweifel, Jarrod Cusens, Sebastian Leuzinger
Diurnal courses of stem radial water dynamics represent the sum of all internal and external conditions affecting tree water relations. Changes in stem radius due to early morning water depletion and night time refilling of storage tissues is generally well documented. This study seeks to understand the unusual daytime refilling of stem elastic storage tissues present in the mangrove species Avicennia marina (Forssk.) Vierh, which deviates from our traditional understanding of hydraulics in terrestrial trees...
March 17, 2018: Tree Physiology
Penny J Tricker, Abdeljalil ElHabti, Jessica Schmidt, Delphine Fleury
Drought and heat stress cause losses in wheat productivity in major growing regions worldwide, and both the occurrence and the severity of these events is likely to increase with global climate change. Water deficits and high temperatures frequently occur simultaneously at sensitive growth stages, reducing wheat yields by reducing grain number or weight. Although genetic variation and underlying quantitative trait loci for either individual stress are known, the combination of the two stresses has rarely been studied...
March 17, 2018: Journal of Experimental Botany
Paula Prieto, Helga Ochagavía, Roxana Savin, Simon Griffiths, Gustavo A Slafer
As wheat yield is linearly related to grain number, understanding the physiological determinants of the number of fertile florets based on floret development dynamics due to the role of the particular genes is relevant. The effects of photoperiod genes on dynamics of floret development are largely ignored. Field experiments were carried out to (i) characterize the dynamics of floret primordia initiation and degeneration and (ii) to determine which are the most critical traits of such dynamics in establishing genotypic differences in the number of fertile florets at anthesis in near isogenic lines (NILs) carrying photoperiod insensitive alleles...
March 19, 2018: Journal of Experimental Botany
Mary C Davis, Kathryn Lemery-Chalfant, Ellen WanHeung Yeung, Linda J Luecken, Alex J Zautra, Michael R Irwin
Background: Childhood abuse is a risk factor for the development of cognitive deficits in adulthood, a relation that is likely mediated by stress-sensitive psychological and physiological indicators. Purpose: To evaluate whether the link between exposure to childhood abuse and cognitive function in middle adulthood is mediated by interleukin-6 (IL-6), metabolic risk, and depressive mood symptoms. Methods: Participants were 770 adults aged 40-65 recruited from the community, who completed the following: (i) a questionnaire assessing exposure to abuse prior to age 18, (ii) a phone interview assessing current depressive mood symptoms, and (iii) a home visit that included blood sampling for evaluation of IL-6 and assessment of metabolic risk indices...
March 19, 2018: Annals of Behavioral Medicine: a Publication of the Society of Behavioral Medicine
Ji She, Jiangtao Guo, Qingfeng Chen, Weizhong Zeng, Youxing Jiang, Xiao-Chen Bai
The organellar two-pore channel (TPC) functions as a homodimer, in which each subunit contains two homologous Shaker-like six-transmembrane (6-TM)-domain repeats. TPCs belong to the voltage-gated ion channel superfamily and are ubiquitously expressed in animals and plants. Mammalian TPC1 and TPC2 are localized at the endolysosomal membrane, and have critical roles in regulating the physiological functions of these acidic organelles. Here we present electron cryo-microscopy structures of mouse TPC1 (MmTPC1)-a voltage-dependent, phosphatidylinositol 3,5-bisphosphate (PtdIns(3,5)P2 )-activated Na+ -selective channel-in both the apo closed state and ligand-bound open state...
March 21, 2018: Nature
Jie Meng, Wen-Xiong Wang, Li Li, Guofan Zhang
Lead (Pb) is one of the ubiquitous and toxic elements in aquatic environment. In oysters, gills and digestive glands are the main target organs for Pb-induced toxicity, but there is limited information on the molecular mechanisms underlying its toxicity. The present study investigated the Pb-induced toxicity mechanisms in the Pacific oyster (Crassostrea gigas) based on transcriptome, phenotypic anchoring, and validation of targeted gene expression. Gene ontology and pathway enrichment analyses revealed the differential Pb toxicity mechanisms in the tissues...
March 13, 2018: Aquatic Toxicology
Veronica Mendoza-Reinoso, Annemiek Beverdam
The skin constantly self-renews throughout adult life. Wnt/β-catenin signaling plays a key role in promoting keratinocyte proliferation in the hair follicles and in the interfollicular epidermis. A recent report demonstrated that epidermal YAP activity drives β-catenin activation to promote keratinocyte proliferation in the murine skin. However, it remains unclear whether this is caused by paracrine activation of canonical Wnt signaling or through other YAP/β-catenin regulatory interactions. In the present study, we found that XAV939-inhibition of canonical WNT signaling in skin of YAP2-5SA-ΔC mice resulted in diminished β-catenin activation, reduced keratinocyte proliferation, and a mitigation of the hyperplastic abnormalities in the interfollicular epidermis, signifying a canonical WNT ligand-dependent mechanism...
March 10, 2018: Stem Cell Research
Daehun Park, Unghwi Lee, Eunji Cho, Haiyan Zhao, Jung Ah Kim, Byoung Ju Lee, Philip Regan, Won-Kyung Ho, Kwangwook Cho, Sunghoe Chang
Despite being a highly enriched synaptic vesicle (SV) protein and a candidate gene for autism, the physiological function of SCAMP5 remains mostly enigmatic. Here, using optical imaging and electrophysiological experiments, we demonstrate that SCAMP5 plays a critical role in release site clearance at the active zone. Truncation analysis revealed that the 2/3 loop domain of SCAMP5 directly interacts with adaptor protein 2, and this interaction is critical for its role in release site clearance. Knockdown (KD) of SCAMP5 exhibited pronounced synaptic depression accompanied by a slower recovery of the SV pool...
March 20, 2018: Cell Reports
Julius A Edson, Dominique Ingato, Shirley Wu, Bianca Lee, Young Jik Kwon
Despite its promises for biomedical applications, the lack of solubility in a physiological solution, the limited molecular interactions with nucleic acids due to the rigid backbone, and the inefficient intracellular release limits the use of chitosan, a natural cationic polysaccharide, for gene delivery. In this study, a flexible, aqueous-soluble aminoethoxy branch was conjugated to the primary hydroxyl group of chitosan via an acid-cleavable ketal linkage, resulting in acid-transforming chitosan (ATC) with greatly increased aqueous solubility, improved siRNA complexation, and degradability in response to an acidic pH...
March 21, 2018: Biomacromolecules
Bhavik N Modi, Kalpa De Silva, Ronak Rajani, Nick Curzen, Divaka Perera
Importance: Ischemia-guided revascularization is the cornerstone of contemporary management of coronary artery disease and has evolved from noninvasive functional evaluation to real-time assessment with invasive physiological indices during diagnostic catheterization. However, serial/diffuse disease is common, and revascularization decisions often need to be made about individual lesions within the same vessel. It is unclear whether current physiological techniques, such as fractional flow reserve, can be reliably used to discern the individual contribution of lesions within a serially diseased vessel with erroneous measurements, potentially leading to suboptimal revascularization decisions...
March 21, 2018: JAMA Cardiology
Morton J Kern, Arnold H Seto
No abstract text is available yet for this article.
March 21, 2018: JAMA Cardiology
Rupen Shah, Kristopher Attwood, Shipra Arya, Daniel E Hall, Jason M Johanning, Emmanuel Gabriel, Anthony Visioni, Steven Nurkin, Moshim Kukar, Steven Hochwald, Nader N Massarweh
Importance: Failure to rescue (FTR), or death after a potentially preventable complication, is a nationally endorsed, publicly reported quality measure. However, little is known about the impact of frailty on FTR, in particular after low-risk surgical procedures. Objective: To assess the association of frailty with FTR in patients undergoing inpatient surgery. Design, Setting, and Participants: This study assessed a cohort of 984 550 patients undergoing inpatient general, vascular, thoracic, cardiac, and orthopedic surgery in the National Surgical Quality Improvement Program between January 1, 2005, and December 31, 2012...
March 21, 2018: JAMA Surgery
Fernando Garagoli, Ezequiel Guzzetti, Ezequiel Lillo, Luciano Lucas, César Belziti
No abstract text is available yet for this article.
February 2018: Arquivos Brasileiros de Cardiologia
W C Chen, Y T Chang, S F Chen, W C Lin, Y Y Su, S D Luo
BACKGROUND: Dysregulation of the autonomic system can affect sinonasal physiological function and may exacerbate the symptom burden associated with rhinosinusitis. However, the association between autonomic dysfunction and chronic rhinosinusitis (CRS) has seldom been studied. Here, we investigated the relationship between autonomic dysfunction and CRS. METHODS: Patients with CRS who failed medical treatment were prospectively enrolled. All patients underwent pre-operative examinations and completed questionnaires, including the reflux symptom index (RSI) and the Sino-nasal Outcome Test-22 (SNOT-22)...
March 21, 2018: Rhinology
Panteleimon D Mavroudis, Helen E Hermes, Donato Teutonico, Thomas G Preuss, Sebastian Schneckener
The environmental fates of pharmaceuticals and the effects of crop protection products on non-target species are subjects that are undergoing intense review. Since measuring the concentrations and effects of xenobiotics on all affected species under all conceivable scenarios is not feasible, standard laboratory animals such as rabbits are tested, and the observed adverse effects are translated to focal species for environmental risk assessments. In that respect, mathematical modelling is becoming increasingly important for evaluating the consequences of pesticides in untested scenarios...
2018: PloS One
Chrysovalantis Voutouri, Triantafyllos Stylianopoulos
Hyaluronan is abundant in the extracellular matrix of many desmoplastic tumors and determines in large part the tumor biochemical and mechanical microenvironment. Additionally, it has been identified as one of the major physiological barriers to the effective delivery of drugs to solid tumors and its targeting with the use of pharmaceutical agents has shown to decompress tumor blood vessels, and thus improve tumor perfusion and efficacy of cytotoxic drugs. In this study, we investigated the contribution of hyaluronan to the accumulation of mechanical forces in tumors...
2018: PloS One
Daniela Hulcová, Kateřina Breiterová, Tomáš Siatka, Kamila Klímová, Lara Davani, Marcela Šafratová, Anna Hošťálková, Angela De Simone, Vincenza Andrisano, Lucie Cahlíková
Glycogen synthase kinase-3β (GSK-3β) is a multifunctional serine/threonine protein kinase that was originally identified as an enzyme involved in the control of glycogen metabolism. It plays a key role in diverse physiological processes including metabolism, the cell cycle, and gene expression by regulating a wide variety of well-known substances like glycogen synthase, tau-protein, and β-catenin. Recent studies have identified GSK-3β as a potential therapeutic target in Alzheimer´s disease, bipolar disorder, stroke, more than 15 types of cancer, and diabetes...
March 21, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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