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Heat acclimation

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https://www.readbyqxmd.com/read/28808135/mutations-in-eif5b-confer-thermosensitive-and-pleiotropic-phenotypes-via-translation-defects-in-arabidopsis-thaliana
#1
Liyuan Zhang, Xinye Liu, Kishor Gaikwad, Xiaoxia Kou, Fei Wang, Xuejun Tian, Mingming Xin, Zhongfu Ni, Qixin Sun, Huiru Peng, Elizabeth Vierling
The conserved eukaryotic translation initiation factor 5B, eIF5B, is a GTPase that acts late in translation initiation. We found that an Arabidopsis thaliana mutant sensitive to hot temperatures 3 (hot3-1), which behaves as wild type in the absence of stress but is unable to acclimate to high temperature, carries a missense mutation in eIF5B1 gene (At1g76810),, producing a temperature sensitive protein. A more severe, T-DNA insertion allele (hot3-2) causes pleiotropic developmental phenotypes. Surprisingly, Arabidopsis has three other eIF5B genes that do not substitute for eIF5B1; two of these appear to be in the process of pseudogenization...
August 14, 2017: Plant Cell
https://www.readbyqxmd.com/read/28804462/heat-acclimation-mediated-cross-tolerance-origins-in-within-life-epigenetics
#2
REVIEW
Michal Horowitz
The primary outcome of heat acclimation is increased thermotolerance, which stems from enhancement of innate cytoprotective pathways. These pathways produce "ON CALL" molecules that can combat stressors to which the body has never been exposed, via cross-tolerance mechanisms (heat acclimation-mediated cross-tolerance-HACT). The foundation of HACT lies in the sharing of generic stress signaling, combined with tissue/organ- specific protective responses. HACT becomes apparent when acclimatory homeostasis is achieved, lasts for several weeks, and has a memory...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28800433/global-gene-expression-analysis-of-the-muscle-tissues-of-medaka-acclimated-to-low-and-high-environmental-temperatures
#3
Daisuke Ikeda, Hiroki Koyama, Nanami Mizusawa, Nobuhiro Kan-No, Engkong Tan, Shuichi Asakawa, Shugo Watabe
Medaka (Oryzias latipes) is a temperate eurythermal fish that is able to survive over a wide range of water temperatures ranging from near zero to over 30°C throughout the year; it maintains its normal physiological and biochemical processes through temperature acclimation. To determine the mechanisms involved in temperature acclimation of fish, the fast skeletal muscle tissues of medaka underwent global gene expression analysis using next-generation sequencing. Ten individuals were placed into two aquariums at 24°C...
August 2, 2017: Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics
https://www.readbyqxmd.com/read/28769941/arabidopsis-thaliana-mterf10-and-mterf11-but-not-mterf12-are-involved-in-the-response-to-salt-stress
#4
Duorong Xu, Dario Leister, Tatjana Kleine
Plastid gene expression (PGE) is crucial for plant development and acclimation to various environmental stress conditions. Members of the "mitochondrial transcription termination factor" (mTERF) family, which are present in both metazoans and plants, are involved in organellar gene expression. Arabidopsis thaliana contains 35 mTERF proteins, of which mTERF10, mTERF11, and mTERF12 were previously assigned to the "chloroplast-associated" group. Here, we show that all three are localized to chloroplast nucleoids, which are associated with PGE...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28747888/the-hsp72-and-hsp90%C3%AE-mrna-responses-to-hot-downhill-running-are-reduced-following-a-prior-bout-of-hot-downhill-running-and-occur-concurrently-within-leukocytes-and-the-vastus-lateralis
#5
James A Tuttle, Bryna C R Chrismas, Oliver R Gibson, James H Barrington, David C Hughes, Paul C Castle, Alan J Metcalfe, Adrian W Midgley, Oliver Pearce, Chindu Kabir, Faizal Rayanmarakar, Sami Al-Ali, Mark P Lewis, Lee Taylor
The leukocyte heat shock response (HSR) is used to determine individual's thermotolerance. The HSR and thermotolerance are enhanced following interventions such as preconditioning and/or acclimation/acclimatization. However, it is unclear whether the leukocyte HSR is an appropriate surrogate for the HSR in other tissues implicated within the pathophysiology of exertional heat illnesses (e.g., skeletal muscle), and whether an acute preconditioning strategy (e.g., downhill running) can improve subsequent thermotolerance...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28739443/sauna-exposure-immediately-prior-to-short-term-heat-acclimation-accelerates-phenotypic-adaptation-in-females
#6
Jessica A Mee, Sophie Peters, Jonathan H Doust, Neil S Maxwell
OBJECTIVES: Investigate whether a sauna exposure prior to short-term heat acclimation (HA) accelerates phenotypic adaptation in females. DESIGN: Randomised, repeated measures, cross-over trial. METHODS: Nine females performed two 5-d HA interventions (controlled hyperthermia Tre≥38.5°C), separated by 7-wk, during the follicular phase of the menstrual cycle confirmed by plasma concentrations of 17-β estradiol and progesterone. Prior to each 90-min HA session participants sat for 20-min in either a temperate environment (20°C, 40% RH; HAtemp) wearing shorts and sports bra or a hot environment (50°C, 30% RH) wearing a sauna suit to replicate sauna conditions (HAsauna)...
July 4, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28733391/diacylglycerol-acyltransferase-mediated-triacylglyerol-synthesis-augments-basal-thermotolerance
#7
Stephanie P Mueller, Melissa Unger, Lena Guender, Agnes Fekete, Martin J Mueller
High temperatures rapidly induce a genetically programmed heat shock response (HSR) that is essential to establish short-term acquired thermotolerance. In addition, an immediate HSR-independent metabolic response is triggered resulting in an accumulation of unsaturated triacylglycerols (TAGs) in the cytosol. The metabolic processes involved in heat-induced TAG formation in plants and their physiological significance remain to be clarified. Lipidomic analyses of Arabidopsis thaliana seedlings indicated that during heat stress polyunsaturated fatty acids from thylakoid galactolipids are incorporated into cytosolic TAGs...
July 21, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28731217/small-rnas-in-regulating-temperature-stress-response-in-plants
#8
Qing Liu, Shijuan Yan, Tifeng Yang, Shaohong Zhang, Yue-Qin Chen, Bin Liu
Due to global climate change, temperature stress has become one of the primary causes of crop losses worldwide. Much progress has been made in unraveling the complex stress response mechanisms in plants, particularly in the identification of temperature stress responsive protein-coding genes. Recently discovered microRNAs (miRNAs) and endogenous small-interfering RNAs (siRNAs) have also been demonstrated as important players in plant temperature stress response. Using high-throughput sequencing, many small RNAs, especially miRNAs, have been identified to be triggered by cold or heat...
July 21, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28729874/systematic-analysis-of-hsf-family-genes-in-the-brassica-napus-genome-reveals-novel-responses-to-heat-drought-and-high-co2-stresses
#9
Xiaoyi Zhu, Chunqian Huang, Liang Zhang, Hongfang Liu, Jinhui Yu, Zhiyong Hu, Wei Hua
Drought and heat stress are major causes of lost plant crop yield. In the future, high levels of CO2, in combination of other abiotic stress factors, will become a novel source of stress. Little is known of the mechanisms involved in the acclimation responses of plants to this combination of abiotic stress factors, though it has been demonstrated that heat shock transcription factors (Hsfs) are involved in plant response to various abiotic stresses. In this study, we performed a genome-wide identification and a systematic analysis of genes in the Hsf gene family in Brassica napus...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28727798/cloning-and-expression-of-genes-encoding-heat-shock-proteins-in-liriomyza-trifolii-and-comparison-with-two-congener-leafminer-species
#10
Ya-Wen Chang, Jing-Yun Chen, Ming-Xing Lu, Yuan Gao, Zi-Hua Tian, Wei-Rong Gong, Chang-Sheng Dong, Yu-Zhou Du
The polyphagous agromyzid fly, Liriomyza trifolii, is a significant and important insect pest of ornamental and vegetable crops worldwide. The adaptation of insects to different environments is facilitated by heat shock proteins (HSPs), which play an important role in acclimation to thermal stress. In this study, we cloned and characterized five HSP-encoding genes of L. trifolii (Lthsp20, Lthsp40, Lthsp60, Lthsp70, and Lthsp90) and monitored their expression under different thermal stresses using real-time quantitative PCR...
2017: PloS One
https://www.readbyqxmd.com/read/28706528/molecular-mechanisms-behind-the-physiological-resistance-to-intense-transient-warming-in-an-iconic-marine-plant
#11
Lazaro Marín-Guirao, Laura Entrambasaguas, Emanuela Dattolo, Juan M Ruiz, Gabriele Procaccini
The endemic Mediterranean seagrass Posidonia oceanica is highly threatened by the increased frequency and intensity of heatwaves. Meadows of the species offer a unique opportunity to unravel mechanisms marine plants activate to cope transient warming, since their wide depth distribution impose divergent heat-tolerance. Understanding these mechanisms is imperative for their conservation. Shallow and deep genotypes within the same population were exposed to a simulated heatwave in mesocosms, to analyze their transcriptomic and photo-physiological responses during and after the exposure...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28695332/systematic-identification-and-characterization-of-stress-inducible-heat-shock-proteins-hsps-in-the-salmon-louse-lepeophtheirus-salmonis
#12
Andreas Borchel, Anna Z Komisarczuk, Alexander Rebl, Tom Goldammer, Frank Nilsen
Salmon lice (Lepeophtheirus salmonis) are parasitic copepods, living mainly on Atlantic salmon and leading to large economical losses in aquaculture every year. Due to the emergence of resistances to several drugs, alternative treatments are developed, including treatment with hydrogen peroxide, freshwater or thermal treatment. The present study gives a first overview of the thermotolerance and stress response of salmon lice. Sea lice nauplii acclimated to 10 °C can survive heat shocks up to 30 °C and are capable of hardening by a sublethal heat shock...
July 10, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28689718/long-term-and-acute-effects-of-temperature-and-oxygen-on-metabolism-food-intake-growth-and-heat-tolerance-in-a-freshwater-gastropod
#13
K Natan Hoefnagel, Wilco C E P Verberk
Temperature affects the physiology and life-history of ectothermic animals, often increasing metabolic rate and decreasing body size. Oxygen limitation has been put forward as a mechanism to explain thermal responses of body size and the ability to survive stress. However the time-scales involved in growth performance and heat tolerance differ radically. In order to increase our understanding of oxygen and temperature effects on body size and heat tolerance and the time scale involved, we reared Lymnaea stagnalis under six combinations of temperature and oxygen tension from hatching up to an age of 300 days and recorded shell length during this whole period...
August 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/28684590/heat-acclimation-has-a-protective-effect-on-the-central-but-not-peripheral-nervous-system
#14
Sebastien Racinais, Mathew G Wilson, Nadia Gaoua, Julien D Périard
This study aimed to clarify the pathway mediating hyperthermia-induced alterations in neural drive transmission, and determine if heat acclimation protects voluntary muscle activation and cognitive function in hyperthermic humans. Electrically evoked potentials (H-reflex and M-wave), executive function (special planning and working memory) and maximal voluntary isometric contractions (120 s) were assessed in fourteen participants in control condition (CON, 24ºC, 40% RH) and hyperthermic states (HYP, 44-50ºC, 50% RH), on consecutive days in a counterbalanced order...
July 6, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28683139/genome-wide-survey-of-heat-shock-factors-and-heat-shock-protein-70s-and-their-regulatory-network-under-abiotic-stresses-in-brachypodium-distachyon
#15
Feng Wen, Xiaozhu Wu, Tongjian Li, Mingliang Jia, Xinshen Liu, Peng Li, Xiaojian Zhou, Xinxin Ji, Xiaomin Yue
The heat shock protein 70s (Hsp70s) and heat shock factors (Hsfs) play key roles in protecting plant cells or tissues from various abiotic stresses. Brachypodium distachyon, recently developed an excellent model organism for functional genomics research, is related to the major cereal grain species. Although B. distachyon genome has been fully sequenced, the information of Hsf and Hsp70 genes and especially the regulatory network between Hsfs and Hsp70s remains incomplete. Here, a total of 24 BdHsfs and 29 BdHsp70s were identified in the genome by bioinformatics analysis and the regulatory network between Hsfs and Hsp70s were performed in this study...
2017: PloS One
https://www.readbyqxmd.com/read/28680933/thermophysiological-adaptations-to-passive-mild-heat-acclimation
#16
H Pallubinsky, L Schellen, B R M Kingma, B Dautzenberg, M A van Baak, W D van Marken Lichtenbelt
Passive mild heat acclimation (PMHA) reflects realistic temperature challenges encountered in everyday life. Active heat acclimation, combining heat exposure and exercise, influences several important thermophysiological parameters; for example, it decreases core temperature and enhances heat exchange via the skin. However, it is unclear whether PMHA elicits comparable adaptations. Therefore, this study investigated the effect of PMHA on thermophysiological parameters. Participants were exposed to slightly increased temperatures (∼33°C/22% RH) for 6 h/d over 7 consecutive days...
2017: Temperature: Multidisciplinary Biomedical Journal
https://www.readbyqxmd.com/read/28670460/factors-affecting-heat-related-diseases-in-outdoor-workers-exposed-to-extreme-heat
#17
Jungsun Park, Yangho Kim, Inbo Oh
BACKGROUND: The objectives of the present study are to: (i) evaluate the effect of environmental and metabolic heat on heat-related illnesses in outdoor workers; and (ii) evaluate the effect of personal factors, including heat acclimation, on the risk of heat-related illnesses in outdoor workers. METHODS: We identified 47 cases of illnesses from exposure to environmental heat in outdoor workers in Korea from 2010 to 2014, based on review of workers' compensation data...
2017: Annals of Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28670286/short-term-low-volume-training-improves-heat-acclimatization-in-an-operational-context
#18
Keyne Charlot, Pierre-Emmanuel Tardo-Dino, Jean-François Buchet, Nathalie Koulmann, Stéphanie Bourdon, Benoit Lepetit, Martin Roslonski, Loïc Jousseaume, Alexandra Malgoyre
Personnel who travel to areas with a hot climate (WBGT > 27°C) may suffer from the heat (physiological strain, thermal discomfort, increased probability of heat illness), making them partially or fully inoperative. Performing physical activities during heat acclimatization is known to improve this process (i.e., improve measures of acclimatization for the same duration of acclimation). However, it is unknown whether such training would be efficient in an operative context, characterized by a high volume of work-related physical activity...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28662571/scaling-from-metabolism-to-population-growth-rate-to-understand-how-acclimation-temperature-alters-thermal-performance
#19
Thomas M Luhring, John P DeLong
The mean and variance of environmental temperature are changing as a consequence of human activities. Ectotherms are sensitive to these temperature changes in the short term, typically displaying a unimodal response of most biological rates to temperature (thermal performance curves; TPCs). Many organisms, however, may acclimate or evolve in response to new temperature regimes. In particular, population growth rate TPCs (r TPCs) reflect the ability to maintain positive growth under a range of temperatures, and therefore shifts in r TPCs due to acclimation are fundamental to our understanding of how ectotherms will respond to changes in climate...
June 28, 2017: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/28652334/dissecting-and-modeling-zeaxanthin-and-lutein-dependent-nonphotochemical-quenching-in-arabidopsis-thaliana
#20
Michelle Leuenberger, Jonathan M Morris, Arnold M Chan, Lauriebeth Leonelli, Krishna K Niyogi, Graham R Fleming
Photosynthetic organisms use various photoprotective mechanisms to dissipate excess photoexcitation as heat in a process called nonphotochemical quenching (NPQ). Regulation of NPQ allows for a rapid response to changes in light intensity and in vascular plants, is primarily triggered by a pH gradient across the thylakoid membrane (∆pH). The response is mediated by the PsbS protein and various xanthophylls. Time-correlated single-photon counting (TCSPC) measurements were performed on Arabidopsis thaliana to quantify the dependence of the response of NPQ to changes in light intensity on the presence and accumulation of zeaxanthin and lutein...
August 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
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