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Heat acclimation

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https://www.readbyqxmd.com/read/28634817/identification-of-the-acclimation-genes-in-transcriptomic-responses-to-heat-stress-of-white-pekin-duck
#1
Jun-Mo Kim, Kyu-Sang Lim, Mijeong Byun, Kyung-Tai Lee, Young-Rok Yang, Mina Park, Dajeong Lim, Han-Ha Chai, Han-Tae Bang, Jong Hwangbo, Yang-Ho Choi, Yong-Min Cho, Jong-Eun Park
White Pekin duck is an important meat resource in the livestock industries. However, the temperature increase due to global warming has become a serious environmental factor in duck production, because of hyperthermia. Therefore, identifying the gene regulations and understanding the molecular mechanism for adaptation to the warmer environment will provide insightful information on the acclimation system of ducks. This study examined transcriptomic responses to heat stress treatments (3 and 6 h at 35 °C) and control (C, 25 °C) using RNA-sequencing analysis of genes from the breast muscle tissue...
June 20, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28628625/neural-progenitor-cell-proliferation-in-the-hypothalamus-is-involved-in-acquired-heat-tolerance-in-long-term-heat-acclimated-rats
#2
Kentaro Matsuzaki, Masanori Katakura, Naotoshi Sugimoto, Toshiko Hara, Michio Hashimoto, Osamu Shido
Constant exposure to moderate heat facilitates progenitor cell proliferation and neuronal differentiation in the hypothalamus of heat-acclimated (HA) rats. In this study, we investigated neural phenotype and responsiveness to heat in HA rats' hypothalamic newborn cells. Additionally, the effect of hypothalamic neurogenesis on heat acclimation in rats was evaluated. Male Wistar rats (5 weeks old) were housed at an ambient temperature (Ta) of 32°C for 6 days (STHA) or 40 days (LTHA), while control (CN) rats were kept at a Ta of 24°C for 6 days (STCN) or 40 days (LTCN)...
2017: PloS One
https://www.readbyqxmd.com/read/28605253/pre-cooling-with-crushed-ice-is-as-effective-as-heat-acclimation-at-improving-cycling-time-trial-performance-in-the-heat
#3
Matthew Zimmermann, Grant J Landers, Karen E Wallman, Georgina Kent
This study compared pre-cooling (ice ingestion) with heat acclimation training on cycling time trial (CTT) performance in the heat. Fifteen male cyclists/triathletes completed two 800 kJ cycle time trials in the heat, with a 12-day training program in between. Initially, all participants consumed 7 g·kg(-1) of water (22°C) in 30 min, prior to completing an 800 kJ CTT in hot, humid conditions (pre-CTT) (35°C, 50% relative humidity; RH). Participants were then split into two groups, pre-cooling (n=7): trained in thermoneutral conditions then underwent pre-cooling with ice ingestion (7 g·kg(-1),1°C) prior to the final CTT (post-CTT), heat acclimation (n=8): trained in hot conditions (35°C, 50% RH) and consumed water (7 g·kg(-1)) prior to post-CTT...
June 12, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28592459/the-effects-of-10-days-of-separate-heat-and-hypoxic-exposure-on-heat-acclimation-and-temperate-exercise-performance
#4
Rebecca A Neal, Jamie Prout, Joseph Costello, Heather C Massey, Michael J Tipton, John S Young, Jo Corbett
Adaptations to heat and hypoxia are typically studied in isolation, but are often encountered in combination. Whether the adaptive response to multiple stressors affords the same response as when examined in isolation is unclear. We examined: i) the influence of overnight moderate normobaric hypoxia on the time course and magnitude of adaption to daily heat exposure; ii) whether heat acclimation (HA) was ergogenic and if this was influenced by an additional hypoxic-stimulus. Eight males (V̇O2max=58.5[8.3] mL·kg(-1)·min(-1)) undertook two 11-day HA programmes (balanced-crossover design), once with overnight normobaric hypoxia (8[1] h per night; 10 nights; FIO2=0...
June 7, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28550206/the-pseudoenzyme-pdx1-2-sustains-vitamin-b6-biosynthesis-as-a-function-of-heat-stress
#5
Elisa Dell'Aglio, Svetlana Boycheva, Teresa B Fitzpatrick
Plants sense temperature changes and respond by altering growth and metabolic activity to acclimate to the altered environmental conditions. The B vitamins give rise to vital coenzymes that are indispensable for growth and development but their inherent reactive nature renders them prone to destruction especially under stress conditions. Therefore, plant survival strategies would be expected to include mechanisms to sustain B vitamin supply under demanding circumstances. Here, using the example of vitamin B6, we investigate the regulation of biosynthesis across eudicot and monocot species under heat stress...
May 26, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28542380/more-oxygen-during-development-enhanced-flight-performance-but-not-thermal-tolerance-of-drosophila-melanogaster
#6
Shayan Shiehzadegan, Jacqueline Le Vinh Thuy, Natalia Szabla, Michael J Angilletta, John M VandenBrooks
High temperatures can stress animals by raising the oxygen demand above the oxygen supply. Consequently, animals under hypoxia could be more sensitive to heating than those exposed to normoxia. Although support for this model has been limited to aquatic animals, oxygen supply might limit the heat tolerance of terrestrial animals during energetically demanding activities. We evaluated this model by studying the flight performance and heat tolerance of flies (Drosophila melanogaster) acclimated and tested at different concentrations of oxygen (12%, 21%, and 31%)...
2017: PloS One
https://www.readbyqxmd.com/read/28535860/effects-of-nesting-material-on-energy-homeostasis-in-balb-canncrl-c57bl-6ncrl-and-crl-cd1-icr-mice-housed-at-20-%C3%A2-c
#7
Jay S Johnson, Daniel J Taylor, Angela R Green, Brianna N Gaskill
Discrepancies exist between the preferred temperature range for mice (26 to 32 °C) and current recommendations (20 to 26 °C), which may alter metabolism and negatively affect studies using mice. Previous research indicates that nesting material can alleviate cold stress in mice; therefore, we sought to determine the effects of the amount of nesting material provided (0, 6, or 12 g) on heat energy loss and energy balance in 3 mouse strains housed at currently recommended temperatures during the daytime, a period of presumed inactivity...
May 1, 2017: Journal of the American Association for Laboratory Animal Science: JAALAS
https://www.readbyqxmd.com/read/28491321/thermotolerance-capacities-of-native-and-exotic-coastal-plants-will-lead-to-changes-in-species-composition-under-increased-heat-waves
#8
Kris French, Sharon A Robinson, Jodie Lia
With an increase in the frequency and intensity of extreme heat events, plants are likely to reach their thermal limits and show slower growth or increased mortality. We investigated differences amongst coastal native and invasive shrubs and grasses to investigate if particular species might be more at risk in the future. Using an ecologically relevant experimental set of heat waves over a month, we assessed changes in biomass and photosynthetic efficiency in a laboratory setting using 25 coastal Australian species divided into native and exotic shrubs, and native and exotic grasses...
2017: Conservation Physiology
https://www.readbyqxmd.com/read/28486332/short-term-heat-acclimation-and-precooling-independently-and-combined-improve-5-km-running-performance-in-the-heat
#9
C A James, A J Richardson, A G B Willmott, P W Watt, O R Gibson, N S Maxwell
Following heat acclimation (HA), endurance running performance remains impaired in hot vs temperate conditions. Combining HA with precooling demonstrates no additive benefit in intermittent sprint, or continuous cycling exercise protocols, during which heat strain may be less severe compared to endurance running. This study investigated the effect of short-term heat acclimation (STHA) combined with mixed-methods precooling, on endurance running performance and directly compared precooling and HA. Nine amateur trained runners completed 5 km treadmill time trials in the heat (32°C, 60% RH) under four conditions; no intervention (CON), precooling (PC), short-term heat acclimation (5 days - HA) and short-term heat acclimation with precooling (HA+PC)...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28482796/effects-of-cold-acclimation-on-gene-expression-in-fall-field-cricket-gryllus-pennsylvanicus-ionoregulatory-tissues
#10
Lauren E Des Marteaux, Alexander H McKinnon, Hiroko Udaka, Jantina Toxopeus, Brent J Sinclair
BACKGROUND: Cold tolerance is a key determinant of temperate insect distribution and performance. Chill-susceptible insects lose ion and water homeostasis during cold exposure, but prior cold acclimation improves both cold tolerance and defense of homeostasis. The mechanisms underlying these processes are mostly unknown; cold acclimation is thought to enhance ion transport in the cold and/or prevent leak of water and ions. To identify candidate mechanisms of cold tolerance plasticity we generated transcriptomes of ionoregulatory tissues (hindgut and Malpighian tubules) from Gryllus pennsylvanicus crickets and compared gene expression in warm- and cold-acclimated individuals...
May 8, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28474894/thermal-shock-induces-host-proteostasis-disruption-and-endoplasmic-reticulum-stress-in-the-model-symbiotic-cnidarian-aiptasia
#11
Clinton A Oakley, Elysanne Durand, Shaun P Wilkinson, Lifeng Peng, Virginia M Weis, Arthur R Grossman, Simon K Davy
Coral bleaching has devastating effects on coral survival and reef ecosystem function, but many of the fundamental cellular effects of thermal stress on cnidarian physiology are unclear. We used label-free liquid chromatography-tandem mass spectrometry to compare the effects of rapidly (33.5 °C, 24 h) and gradually (30 and 33.5 °C, 12 days) elevated temperatures on the proteome of the model symbiotic anemone Aiptasia. We identified 2133 proteins in Aiptasia, 136 of which were differentially abundant between treatments...
May 11, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28462685/effect-of-heat-exposure-on-cognition-in-persons-with-tetraplegia
#12
John P Handrakis, Zhen Ni Guan, John W Nulty, Oriana Tascione, Dwindally Rosado-Rivera, Daniel White, Charlene Bang, Ann Spungen, William A Bauman
Individuals with cervical spinal cord injury (SCI) have impaired thermoregulatory mechanisms due to interruption of motor, sensory, and autonomic neuropathways. To determine the effects of heat exposure on core body temperature (Tcore) and cognitive performance in persons with tetraplegia, eight individuals with chronic tetraplegia (C3-C7, AIS A-B) and 9 able-bodied controls were acclimated to 27°C at baseline (BL) before being exposed to 35°C for up to 120 minutes (Heat Challenge). Rectal temperature (Tcore), distal skin temperatures (Tsk<sub>avg</sub>), sweat rate (QS<sub>avg</sub>), microvascular skin perfusion (LDF<sub>avg</sub>), and plasma norepinephrine (NE) were measured...
May 2, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28454925/cross-tolerance-effects-due-to-adult-heat-hardening-desiccation-and-starvation-acclimation-of-tropical-drosophilid-zaprionus-indianus
#13
Bhawna Kalra, Aditya Moktan Tamang, Ravi Parkash
Some insect taxa from polar or temperate habitats have shown cross-tolerance for multiple stressors but tropical insect taxa have received less attention. Accordingly, we considered adult flies of a tropical drosophilid-Zaprionus indianus for testing direct as well as cross-tolerance effects of rapid heat hardening (HH), desiccation acclimation (DA) and starvation acclimation (SA) after rearing under warmer and drier season specific simulated conditions. We observed significant direct acclimation effects of HH, DA and SA; and four cases of cross-tolerance effects but no cross-tolerance between desiccation and starvation...
July 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/28443536/effects-of-nesting-material-on-energy-homeostasis-in-balb-canncrl-c57bl-6ncrl-and-crl-cd1-icr-mice-housed-at-20-%C3%A2-c
#14
Daniel Taylor, Angela Green, Brianna Gaskill
Discrepancies exist between the preferred temperature range for mice (26 to 32 °C) and current recommendations (20 to26 °C), which may alter metabolism and negatively affect studies using mice. Previous research indicates that nesting materialcan alleviate cold stress in mice; therefore, we sought to determine the effects of the amount of nesting material provided(0, 6, or 12 g) on heat energy loss and energy balance in 3 mouse strains housed at currently recommended temperatures duringthe daytime, a period of presumed inactivity...
April 25, 2017: Journal of the American Association for Laboratory Animal Science: JAALAS
https://www.readbyqxmd.com/read/28433751/elevated-chaperone-proteins-are-a-feature-of-winter-freeze-avoidance-by-larvae-of-the-goldenrod-gall-moth-epiblema-scudderiana
#15
Guijun Zhang, Janet M Storey, Kenneth B Storey
Winter survival for many insect species includes a need to maintain metabolic homeostasis and structural/functional integrity of macromolecules not only over a wide range of cold temperatures but also in response to rapid temperature change. Chaperones are well-known to protect/stabilize protein structure with regard to heat stress but less is known about their potential involvement in long-term protection of the proteome at subzero temperatures. The present study assessed the participation of chaperone proteins in the cold hardiness of larvae of the goldenrod gall moth, Epiblema scudderiana (Clemens) (Lepidoptera, Olethreutidae), monitoring changes in nine proteins over the winter months as well as their responses to laboratory cold acclimation or anoxia exposure...
April 19, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28424950/estimated-work-ability-in-warm-outdoor-environments-depends-on-the-chosen-heat-stress-assessment-metric
#16
Peter Bröde, Dusan Fiala, Bruno Lemke, Tord Kjellstrom
With a view to occupational effects of climate change, we performed a simulation study on the influence of different heat stress assessment metrics on estimated workability (WA) of labour in warm outdoor environments. Whole-day shifts with varying workloads were simulated using as input meteorological records for the hottest month from four cities with prevailing hot (Dallas, New Delhi) or warm-humid conditions (Managua, Osaka), respectively. In addition, we considered the effects of adaptive strategies like shielding against solar radiation and different work-rest schedules assuming an acclimated person wearing light work clothes (0...
April 19, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/28413684/physiological-effects-of-environmentally-relevant-multi-day-thermal-stress-on-wild-juvenile-atlantic-salmon-salmo-salar
#17
Emily Corey, Tommi Linnansaari, Richard A Cunjak, Suzanne Currie
The frequency of extreme thermal events in temperate freshwater systems is expected to increase alongside global surface temperature. The Miramichi River, located in eastern Canada, is a prominent Atlantic salmon (Salmo salar) river where water temperatures can exceed the proposed upper thermal limit for the species (~27°C). Current legislation closes the river to recreational angling when water temperatures exceed 20°C for two consecutive nights. We aimed to examine how natural thermal variation, representative of extreme high thermal events, affected the thermal tolerance and physiology of wild, juvenile Atlantic salmon...
2017: Conservation Physiology
https://www.readbyqxmd.com/read/28400749/radiative-energy-budgets-of-phototrophic-surface-associated-microbial-communities-and-their-photosynthetic-efficiency-under-diffuse-and-collimated-light
#18
Mads Lichtenberg, Kasper E Brodersen, Michael Kühl
We investigated the radiative energy budgets of a heterogeneous photosynthetic coral reef sediment and a compact uniform cyanobacterial biofilm on top of coastal sediment. By combining electrochemical, thermocouple and fiber-optic microsensor measurements of O2, temperature and light, we could calculate the proportion of the absorbed light energy that was either dissipated as heat or conserved by photosynthesis. We show, across a range of different incident light regimes, that such radiative energy budgets are highly dominated by heat dissipation constituting up to 99...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28398156/a-simulated-heat-wave-has-diverse-effects-on-immune-function-and-oxidative-physiology-in-the-corn-snake-pantherophis-guttatus
#19
Z R Stahlschmidt, S S French, A Ahn, A Webb, M W Butler
Animals will continue to encounter increasingly warm environments, including more frequent and intense heat waves. Yet the physiological consequences of heat waves remain equivocal, potentially because of variation in adaptive plasticity (reversible acclimation) and/or aspects of experimental design. Thus, we measured a suite of physiological variables in the corn snake (Pantherophis guttatus) after exposure to field-parameterized, fluctuating temperature regimes (moderate temperature and heat wave treatments) to address two hypotheses: (1) a heat wave causes physiological stress, and (2) thermal performance of immune function exhibits adaptive plasticity in response to a heat wave...
July 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/28389828/cross-adaptation-heat-and-cold-adaptation-to-improve-physiological-and-cellular-responses-to-hypoxia
#20
REVIEW
Oliver R Gibson, Lee Taylor, Peter W Watt, Neil S Maxwell
To prepare for extremes of heat, cold or low partial pressures of oxygen (O2), humans can undertake a period of acclimation or acclimatization to induce environment-specific adaptations, e.g. heat acclimation (HA), cold acclimation (CA), or altitude training. While these strategies are effective, they are not always feasible due to logistical impracticalities. Cross-adaptation is a term used to describe the phenomenon whereby alternative environmental interventions, e.g. HA or CA, may be a beneficial alternative to altitude interventions, providing physiological stress and inducing adaptations observable at altitude...
April 7, 2017: Sports Medicine
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