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https://www.readbyqxmd.com/read/28326508/exposure-to-high-ambient-temperatures-alters-embryology-in-rabbits
#1
M L García, M J Argente
High ambient temperatures are a determining factor in the deterioration of embryo quality and survival in mammals. The aim of this study was to evaluate the effect of heat stress on embryo development, embryonic size and size of the embryonic coats in rabbits. A total of 310 embryos from 33 females in thermal comfort zone and 264 embryos of 28 females in heat stress conditions were used in the experiment. The traits studied were ovulation rate, percentage of total embryos, percentage of normal embryos, embryo area, zona pellucida thickness and mucin coat thickness...
March 22, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/28326094/selection-and-validation-of-reference-genes-for-accurate-rt-qpcr-data-normalization-in-coffea-spp-under-a-climate-changes-context-of-interacting-elevated-co2-and-temperature
#2
Madlles Q Martins, Ana S Fortunato, Weverton P Rodrigues, Fábio L Partelli, Eliemar Campostrini, Fernando C Lidon, Fábio M DaMatta, José C Ramalho, Ana I Ribeiro-Barros
World coffee production has faced increasing challenges associated with ongoing climatic changes. Several studies, which have been almost exclusively based on temperature increase, have predicted extensive reductions (higher than half by 2,050) of actual coffee cropped areas. However, recent studies showed that elevated [CO2] can strongly mitigate the negative impacts of heat stress at the physiological and biochemical levels in coffee leaves. In addition, it has also been shown that coffee genotypes can successfully cope with temperatures above what has been traditionally accepted...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28325834/structural-model-of-dodecameric-heat-shock-protein-hsp21-flexible-n-terminal-arms-interact-with-client-proteins-while-c-terminal-tails-maintain-the-dodecamer-and-chaperone-activity
#3
Gudrun Rutsdottir, Johan Härmark, Yoran Weide, Hans Hebert, Morten Ib Rasmussen, Sven Wernersson, Michal Respondek, Mikael Akke, Peter Højrup, Philip J B Koeck, Christopher A G Söderberg, Cecilia Emanuelsson
Small heat shock proteins (sHsps) prevent aggregation of thermosensitive client proteins in a first line of defense against cellular stress. The mechanisms by which they perform this function have been hard to define due to limited structural information; currently there is only one high-resolution structure of a plant sHsp published, of the cytosolic Hsp16.9. We took interest in Hsp21, a chloroplast-localized sHsp crucial for plant stress resistance, which has even longer N-terminals arms than Hsp16.9, with a functionally important and conserved methionine-rich motif...
March 21, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28325832/physiological-effects-of-temperature-do-not-explain-prevalence-of-females-in-populations-of-gynodioecious-lobelia-siphilitica-growing-in-warmer-climates
#4
Maia F Bailey, Andrea L Case, Christina M Caruso
PREMISE OF THE STUDY: Gynodioecy is a sexual polymorphism whereby female and hermaphroditic plants co-occur within populations. In many gynodioecious species, stressful abiotic environments are associated with higher frequencies of females. This association suggests that abiotic stress affects the relative fitness of females and hermaphrodites and, thus, the maintenance of gynodioecy. METHODS: To test whether abiotic stress affects the fitness of females and hermaphrodites, we grew open-pollinated Lobelia siphilitica families in temperature regimes characteristic of the southern portion of the species' range (where females are common) and the northern portion of the range (where females are rare)...
March 21, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28324683/thermal-stress-impacts-reproductive-development-and-grain-yield-in-rice
#5
REVIEW
Muhammad Shakeel Arshad, Muhammad Farooq, Folkard Asch, Jagadish S V Krishna, P V Vara Prasad, Kadambot H M Siddique
Rice is highly sensitive to temperature stress (cold and heat), particularly during the reproductive and grain-filling stages. In this review, we discuss the effects of low- and high-temperature sensitivity in rice at various reproductive stages (from meiosis to grain development) and propose strategies for improving the tolerance of rice to terminal thermal stress. Cold stress impacts reproductive development through (i) delayed heading, due to its effect on anther respiration, which increases sucrose accumulation, protein denaturation and asparagine levels, and decreases proline accumulation, (ii) pollen sterility owing to tapetal hypertrophy and related nutrient imbalances, (iii) reduced activity of cell wall bound invertase in the tapetum of rice anthers, (iv) impaired fertilization due to inhibited anther dehiscence, stigma receptivity and ability of the pollen tube to germinate through the style towards the ovary, and (v) floret sterility, which increases grain abortion, restricts grain size, and thus reduces grain yield...
March 16, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28324352/the-six-tomato-yellow-leaf-curl-virus-genes-expressed-individually-in-tomato-induce-different-levels-of-plant-stress-response-attenuation
#6
Rena Gorovits, Adi Moshe, Linoy Amrani, Rotem Kleinberger, Ghandi Anfoka, Henryk Czosnek
Tomato yellow leaf curl virus (TYLCV) is a begomovirus infecting tomato plants worldwide. TYLCV needs a healthy host environment to ensure a successful infection cycle for long periods. Hence, TYLCV restrains its destructive effect and induces neither a hypersensitive response nor cell death in infected tomatoes. On the contrary, TYLCV counteracts cell death induced by other factors, such as inactivation of HSP90 functionality. Suppression of plant death is associated with the inhibition of the ubiquitin 26S proteasome degradation and with a deactivation of the heat shock transcription factor HSFA2 pathways (including decreased HSP17 levels)...
March 21, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28324160/regulation-of-blood-oxygen-transport-in-hibernating-mammals
#7
Inge G Revsbech, Angela Fago
Along with the periodic reductions in O2 requirements of mammalian hibernators during winter, the O2 affinity of the blood of mammalian hibernators is seasonally regulated to help match O2 supply to consumption, contributing to limit tissue oxidative stress, particularly at arousals. Specifically, mammalian hibernators consistently show an overall increase in the blood-O2 affinity, which causes a decreased O2 unloading to tissues, while having similar or lower tissue O2 tensions during hibernation. This overview explores how the decreased body temperature and concentration of red blood cell 2,3-diphosphoglycerate (DPG) that occur in hibernation contribute separately or in combination to the concurrent increase in the O2 affinity of the hemoglobin, the O2 carrier protein of the blood...
March 21, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/28322928/a-temperature-responsive-gene-in-sorghum-encodes-a-glycine-rich-protein-that-interacts-with-calmodulin
#8
Supreet Singh, Amardeep Singh Virdi, Rajdeep Jaswal, Mrinalini Chawla, Sanjay Kapoor, Samar B Mohapatra, Narayanan Manoj, Ashwani Pareek, Sanjay Kumar, Prabhjeet Singh
Imposition of different biotic and abiotic stress conditions results in an increase in intracellular levels of Ca(2+) which is sensed by various sensor proteins. Calmodulin (CaM) is one of the best studied transducers of Ca(2+) signals. CaM undergoes conformational changes upon binding to Ca(2+) and interacts with different types of proteins, thereby, regulating their activities. The present study reports the cloning and characterization of a sorghum cDNA encoding a protein (SbGRBP) that shows homology to glycine-rich RNA-binding proteins...
March 18, 2017: Biochimie
https://www.readbyqxmd.com/read/28322253/ubiquitylation-of-p62-sequestosome1-activates-its-autophagy-receptor-function-and-controls-selective-autophagy-upon-ubiquitin-stress
#9
Hong Peng, Jiao Yang, Guangyi Li, Qing You, Wen Han, Tianrang Li, Daming Gao, Xiaoduo Xie, Byung-Hoon Lee, Juan Du, Jian Hou, Tao Zhang, Hai Rao, Ying Huang, Qinrun Li, Rong Zeng, Lijian Hui, Hongyan Wang, Qin Xia, Xuemin Zhang, Yongning He, Masaaki Komatsu, Ivan Dikic, Daniel Finley, Ronggui Hu
Alterations in cellular ubiquitin (Ub) homeostasis, known as Ub stress, feature and affect cellular responses in multiple conditions, yet the underlying mechanisms are incompletely understood. Here we report that autophagy receptor p62/sequestosome-1 interacts with E2 Ub conjugating enzymes, UBE2D2 and UBE2D3. Endogenous p62 undergoes E2-dependent ubiquitylation during upregulation of Ub homeostasis, a condition termed as Ub(+) stress, that is intrinsic to Ub overexpression, heat shock or prolonged proteasomal inhibition by bortezomib, a chemotherapeutic drug...
March 21, 2017: Cell Research
https://www.readbyqxmd.com/read/28322172/immune-neuroendocrine-dysregulation-in-patients-with-osteoarthritis-a-revision-and-a-pilot-study
#10
Isabel Gálvez, Silvia Torres-Piles, María Dolores Hinchado, Alberto Álvarez-Barrientos, Pilar Torralbo-Jiménez, Jorge Guerrero, Leticia Martín-Cordero, Eduardo Ortega
BACKGROUND: Although osteoarthritis has predominantly been considered a non-inflammatory degenerative arthropathy, there is growing evidence that various inflammatory and immunological processes might contribute to the onset, progression, and burden of the disease. OBJECTIVE: The purpose of the present investigation was to study the systemic inflammatory and stress responses and the innate response mediated by neutrophils in OA patients. METHOD: A group of patients diagnosed with primary OA according to the American College of Rheumatology criteria and a control group of age-matched healthy volunteers were enrolled in the study...
March 20, 2017: Endocrine, Metabolic & Immune Disorders Drug Targets
https://www.readbyqxmd.com/read/28321638/wearing-graduated-compression-stockings-augments-cutaneous-vasodilation-in-heat-stressed-resting-humans
#11
Naoto Fujii, Toshiya Nikawa, Bun Tsuji, Narihiko Kondo, Glen P Kenny, Takeshi Nishiyasu
PURPOSE: We investigated whether graduated compression induced by stockings enhances cutaneous vasodilation in passively heated resting humans. METHODS: Nine habitually active young men were heated at rest using water-perfusable suits, resulting in a 1.0 °C increase in body core temperature. Heating was repeated twice on separate occasions while wearing either (1) stockings that cause graduated compression (pressures of 26.4 ± 5.3, 17.5 ± 4.4, and 6...
March 20, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28320639/exposure-to-polycyclic-aromatic-hydrocarbons-and-volatile-organic-compounds-among-recently-pregnant-rural-guatemalan-women-cooking-and-heating-with-solid-fuels
#12
John R Weinstein, Renée Asteria-Peñaloza, Anaité Diaz-Artiga, Gilberto Davila, S Katharine Hammond, Ian T Ryde, Joel N Meyer, Neal Benowitz, Lisa M Thompson
BACKGROUND: Household air pollution is a major contributor to death and disability worldwide. Over 95% of rural Guatemalan households use woodstoves for cooking or heating. Woodsmoke contains carcinogenic or fetotoxic polycyclic aromatic hydrocarbons (PAHs) and volatile organic compounds (VOCs). Increased PAHs and VOCs have been shown to increase levels of oxidative stress. OBJECTIVE: We examined PAH and VOC exposures among recently pregnant rural Guatemalan women exposed to woodsmoke and compared exposures to levels seen occupationally or among smokers...
March 10, 2017: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/28319253/heat-shock-protein-expression-in-cerebral-x-linked-adrenoleukodystrophy-reveals-astrocyte-stress-prior-to-myelin-loss
#13
Anna Lena Görtz, Laura A N Peferoen, Wouter H Gerritsen, Johannes M van Noort, Marianna Bugiani, Sandra Amor
AIMS: X-linked adrenoleukodystrophy (X-ALD) is a genetic white matter disorder in which demyelination occurs due to accumulation of very long chain fatty acids. Inflammation in the brain white matter is a hallmark of the pathology of cerebral X-ALD, but the underlying pathogenic mechanisms are still largely unknown. In other inflammatory demyelinating disorders such as multiple sclerosis, the expression of heat shock proteins (HSPs) in combination with interferon-γ (IFN-γ) has been suggested to play a prominent role in the initiation of demyelination and inflammation...
March 20, 2017: Neuropathology and Applied Neurobiology
https://www.readbyqxmd.com/read/28319117/comparative-genomics-of-clavibacter-michiganensis-subspecies-pathogens-of-important-agricultural-crops
#14
James T Tambong
Subspecies of Clavibacter michiganensis are important phytobacterial pathogens causing devastating diseases in several agricultural crops. The genome organizations of these pathogens are poorly understood. Here, the complete genomes of 5 subspecies (C. michiganensis subsp. michiganensis, Cmi; C. michiganensis subsp. sepedonicus, Cms; C. michiganensis subsp. nebraskensis, Cmn; C. michiganensis subsp. insidiosus, Cmi and C. michiganensis subsp. capsici, Cmc) were analyzed. This study assessed the taxonomic position of the subspecies based on 16S rRNA and genome-based DNA homology and concludes that there is ample evidence to elevate some of the subspecies to species-level...
2017: PloS One
https://www.readbyqxmd.com/read/28318792/halogen-free-organophosphorus-flame-retardants-caused-oxidative-stress-and-multixenobiotic-resistance-in-asian-freshwater-clams-corbicula-fluminea
#15
Saihong Yan, Huimin Wu, Jianhui Qin, Jinmiao Zha, Zijian Wang
Halogen-free organophosphorus flame retardants are widespread in aquatic environments. Although it has been documented that they affect the behavior and reproduction of aquatic species, researches investigating cellular detoxification and the defense system in bivalves are scarce. In this study, adult Asian clams (C. fluminea) were exposed to tris (2-butoxyethyl) phosphate (TBEP) and tributyl phosphate (TBP) at 20, 200, and 2000 μg/L for 28 d. The results showed no noticeable difference in siphoning behavior...
March 16, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28316142/evolutionary-ecology-of-beta-lactam-gene-clusters-in-animals
#16
Wouter Suring, Karen Meusemann, Alexander Blanke, Janine Mariën, Tim Schol, Valeria Agamennone, Anna Faddeeva-Vakhrusheva, Matty P Berg, Bram Brouwer, Nico M van Straalen, Dick Roelofs
Beta-lactam biosynthesis was thought to occur only in fungi and bacteria, but we recently reported the presence of isopenicillin N synthase in a soil-dwelling animal, Folsomia candida. However, it has remained unclear whether this gene is part of a larger beta-lactam biosynthesis pathway and how widespread the occurrence of penicillin biosynthesis is among animals. Here, we analyzed the distribution of beta-lactam biosynthesis genes throughout the animal kingdom and identified a beta-lactam gene cluster in the genome of F...
March 18, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28316054/the-effect-of-fluid-intake-following-dehydration-on-subsequent-athletic-and-cognitive-performance-a-systematic-review-and-meta-analysis
#17
REVIEW
Danielle McCartney, Ben Desbrow, Christopher Irwin
BACKGROUND: The deleterious effects of dehydration on athletic and cognitive performance have been well documented. As such, dehydrated individuals are advised to consume fluid in volumes equivalent to 1.25 to 1.5 L kg(-1) body mass (BM) lost to restore body water content. However, individuals undertaking subsequent activity may have limited time to consume fluid. Within this context, the impact of fluid intake practices is unclear. This systematic review investigated the effect of fluid consumption following a period of dehydration on subsequent athletic and cognitive performance...
December 2017: Sports Medicine—Open
https://www.readbyqxmd.com/read/28315793/highlighting-the-effects-of-coumarin-on-adult-plants-of-arabidopsis-thaliana-l-heynh-by-an-integrated-omic-approach
#18
Fabrizio Araniti, Monica Scognamiglio, Angela Chambery, Rosita Russo, Assunta Esposito, Brigida D'Abrosca, Antonio Fiorentino, Antonio Lupini, Francesco Sunseri, Maria Rosa Abenavoli
In this study, the effects of the allelochemical coumarin through a metabolomic, proteomic and morpho-physiological approach in Arabidopsis adult plants (25days old) were investigated. Metabolomic analysis evidenced an increment of amino acids and a high accumulation of soluble sugars, after 6days of coumarin treatment. This effect was accompanied by a strong decrease on plant fresh and dry weights, as well as on total protein content. On the contrary, coumarin did not affect leaf number but caused a reduction in leaf area...
March 1, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28315791/neurotoxic-effects-molecular-responses-and-oxidative-stress-biomarkers-in-nile-tilapia-oreochromis-niloticus-linnaeus-1758-exposed-to-verapamil
#19
Malachy N O Ajima, Pramod K Pandey, Kundan Kumar, Nalini Poojary
Pharmaceutical drugs and their metabolites are detected in aquatic ecosystems and have been reported to cause ecotoxicological consequences to resident aquatic organisms The study investigated the effects of acute and long-term exposure to verapamil on activities of acetylcholinesterase and antioxidant enzymes as well as mRNA expression of stress-related genes in brain and muscle tissues of Nile tilapia, Oreochromis niloticus. The 96h LC50 of verapamil to O. niloticus was 2.29mg L(-1). Exposure to sub-lethal concentrations of verapamil (0...
March 15, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28315647/a-device-that-allows-rodents-to-behaviorally-thermoregulate-when-housed-in-vivariums
#20
Christopher J Gordon, Earl T Puckett, Elizabeth S Repasky, Andrew F M Johnstone
Laboratories and vivariums typically are maintained at ambient temperatures of 20 to 24 °C, leading to cold stress in mice. When mice are inactive and sleeping during the light phase, their zone of thermoneutrality associated with a basal metabolic rate is 30 to 32 °C. If given a choice, mice will use thermoregulatory behavior to seek out thermoneutral temperatures during the light phase. The cold stress of a vivarium can be problematic to researchers requiring an animal model that is not stressed metabolically...
March 1, 2017: Journal of the American Association for Laboratory Animal Science: JAALAS
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