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https://www.readbyqxmd.com/read/28222226/arctic-ground-squirrel-hippocampus-tolerates-oxygen-glucose-deprivation-independent-of-hibernation-season-even-when-not-hibernating-and-after-atp-depletion-acidosis-and-glutamate-efflux
#1
Saurav Bhowmick, Jeanette T Moore, Daniel L Kirschner, Kelly L Drew
Cerebral ischemia/reperfusion (I/R) triggers a cascade of uncontrolled cellular processes that perturb cell homeostasis. The arctic ground squirrel (AGS), a seasonal hibernator resists brain damage following cerebral I/R caused by cardiac arrest and resuscitation. However, it remains unclear if tolerance to I/R injury in AGS depends on the hibernation season. Moreover, it is also not clear if events such as depletion of ATP, acidosis and glutamate efflux that are associated with anoxic depolarization are attenuated in AGS...
February 21, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28216338/glutathione-redox-balance-in-hibernating-chinese-soft-shelled-turtle-pelodiscus-sinensis-hatchlings
#2
Wenyi Zhang, Cuijuan Niu, Yukun Liu, Bojian Chen
Glutathione (GSH) system is a critical component of antioxidant defense, which is important for hibernating survive of turtle hatchlings. The present work measured changes at the mRNA level of genes involved in GSH synthesis, GSH reduction and GSH utilization, as well as enzyme activity, in Pelodiscus sinensis hatchlings during hibernation. Samples were taken in the field at pre-hibernation (17°C, Mud temperature (MT)), hibernation (5.8°C, MT) and arousal (20.1°C, MT). Cerebral total GSH content decreased during hibernation, recovered after arousal along with a stable ratio of GSH/GSSG...
February 12, 2017: Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
https://www.readbyqxmd.com/read/28213638/hung-out-to-dry-intraspecific-variation-in-water-loss-in-a-hibernating-bat
#3
Brandon J Klüg-Baerwald, R Mark Brigham
Hibernation is a period of water deficit for some small mammals, and humidity strongly influences hibernation patterns. Dry conditions reduce length of torpor bouts, stimulate arousals, and decrease overwinter survival. To mitigate these effects, many small mammals hibernate in near saturated (100% RH) conditions. However, big brown bats (Eptesicus fuscus) hibernate in a wider variety of conditions and tolerate lower humidity than most other bats. To assess arid tolerance in this species, we compared torpid metabolic rates (TMR) and rates of total evaporative water loss (TEWL) between two populations of E...
February 17, 2017: Oecologia
https://www.readbyqxmd.com/read/28210076/potential-role-of-the-gut-microbiota-in-synthetic-torpor-and-therapeutic-hypothermia
#4
REVIEW
Claudia Sisa, Silvia Turroni, Roberto Amici, Patrizia Brigidi, Marco Candela, Matteo Cerri
Therapeutic hypothermia is today used in several clinical settings, among them the gut related diseases that are influenced by ischemia/reperfusion injury. This perspective paved the way to the study of hibernation physiology, in natural hibernators, highlighting an unexpected importance of the gut microbial ecosystem in hibernation and torpor. In natural hibernators, intestinal microbes adaptively reorganize their structural configuration during torpor, and maintain a mutualistic configuration regardless of long periods of fasting and cold temperatures...
January 21, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28202775/winter-is-coming-tumor-cells-go-into-hibernation
#5
Amanda W Lund
In response to hypoxia in the primary tumor microenvironment, tumor cells induce a state of dormancy enabling their persistence at metastatic sites and resistance to therapy.
February 15, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28196149/climatic-and-geographic-predictors-of-life-history-variation-in-eastern-massasauga-sistrurus-catenatus-a-range-wide-synthesis
#6
Eric T Hileman, Richard B King, John M Adamski, Thomas G Anton, Robyn L Bailey, Sarah J Baker, Nickolas D Bieser, Thomas A Bell, Kristin M Bissell, Danielle R Bradke, Henry Campa, Gary S Casper, Karen Cedar, Matthew D Cross, Brett A DeGregorio, Michael J Dreslik, Lisa J Faust, Daniel S Harvey, Robert W Hay, Benjamin C Jellen, Brent D Johnson, Glenn Johnson, Brooke D Kiel, Bruce A Kingsbury, Matthew J Kowalski, Yu Man Lee, Andrew M Lentini, John C Marshall, David Mauger, Jennifer A Moore, Rori A Paloski, Christopher A Phillips, Paul D Pratt, Thomas Preney, Kent A Prior, Andrew Promaine, Michael Redmer, Howard K Reinert, Jeremy D Rouse, Kevin T Shoemaker, Scott Sutton, Terry J VanDeWalle, Patrick J Weatherhead, Doug Wynn, Anne Yagi
Elucidating how life history traits vary geographically is important to understanding variation in population dynamics. Because many aspects of ectotherm life history are climate-dependent, geographic variation in climate is expected to have a large impact on population dynamics through effects on annual survival, body size, growth rate, age at first reproduction, size-fecundity relationship, and reproductive frequency. The Eastern Massasauga (Sistrurus catenatus) is a small, imperiled North American rattlesnake with a distribution centered on the Great Lakes region, where lake effects strongly influence local conditions...
2017: PloS One
https://www.readbyqxmd.com/read/28179513/immune-responses-in-hibernating-little-brown-myotis-myotis-lucifugus-with-white-nose-syndrome
#7
T M Lilley, J M Prokkola, J S Johnson, E J Rogers, S Gronsky, A Kurta, D M Reeder, K A Field
White-nose syndrome (WNS) is a fungal disease responsible for decimating many bat populations in North America. Pseudogymnoascus destructans (Pd), the psychrophilic fungus responsible for WNS, prospers in the winter habitat of many hibernating bat species. The immune response that Pd elicits in bats is not yet fully understood; antibodies are produced in response to infection by Pd, but they may not be protective and indeed may be harmful. To understand how bats respond to infection during hibernation, we studied the effect of Pd inoculation on the survival and gene expression of captive hibernating Myotis lucifugus with varying pre-hibernation antifungal antibody titres...
February 8, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28178988/nested-houses-domestication-dynamics-of-human-wasp-relations-in-contemporary-rural-japan
#8
Charlotte L R Payne, Joshua D Evans
BACKGROUND: Domestication is an important and contested concept. Insects are used as food worldwide, and while some have been described as domesticated and even 'semi-domesticated', the assumptions and implications of this designation are not clear. The purpose of this paper is to explore these aspects of insect domestication, and broader debates in domestication studies, through the case of edible wasps in central rural Japan. METHODS: Both authors conducted ethnographic fieldwork with communities in central rural Japan...
February 8, 2017: Journal of Ethnobiology and Ethnomedicine
https://www.readbyqxmd.com/read/28178279/snow-leopard-and-himalayan-wolf-food-habits-and-prey-selection-in-the-central-himalayas-nepal
#9
Madhu Chetri, Morten Odden, Per Wegge
Top carnivores play an important role in maintaining energy flow and functioning of the ecosystem, and a clear understanding of their diets and foraging strategies is essential for developing effective conservation strategies. In this paper, we compared diets and prey selection of snow leopards and wolves based on analyses of genotyped scats (snow leopards n = 182, wolves n = 57), collected within 26 sampling grid cells (5×5 km) that were distributed across a vast landscape of ca 5000 km2 in the Central Himalayas, Nepal...
2017: PloS One
https://www.readbyqxmd.com/read/28155661/functional-analysis-for-gut-microbes-of-the-brown-tree-frog-polypedates-megacephalus-in-artificial-hibernation
#10
Francis Cheng-Hsuan Weng, Yi-Ju Yang, Daryi Wang
BACKGROUND: Annual hibernation is an adaptation that helps many animals conserve energy during food shortage in winter. This natural cycle is also accompanied by a remodeling of the intestinal immune system, which is an aspect of host biology that is both influenced by, and can itself influence, the microbiota. In amphibians, the bacteria in the intestinal tract show a drop in bacterial counts. The proportion of pathogenic bacteria is greater in hibernating frogs than that found in nonhibernating frogs...
December 22, 2016: BMC Genomics
https://www.readbyqxmd.com/read/28149519/an-evaluation-of-the-use-of-pentosidine-as-a-biomarker-for-ageing-turtles
#11
John B Iverson, Randal S Stahl, Carol Furcolow, Fred Kraus
Concentrations of the biomarker pentosidine have been shown to be useful measures of age for a number of avian and mammalian species. However, no study has examined its usefulness as an age marker in a long-lived ectotherm despite the fact that such a marker could prove useful in understanding age distributions of populations subject to conservation programmes. Therefore, we evaluated pentosidine concentrations in the interdigital webbing of 117 female yellow mud turtles (Kinosternon flavescens) at a 35 year study site in western Nebraska where nearly all turtles are of known age...
2017: Conservation Physiology
https://www.readbyqxmd.com/read/28144740/hibernation-reduces-cellular-damage-caused-by-warm-hepatic-ischemia-reperfusion-in-ground-squirrels
#12
Jessica P Otis, Amanda C Pike, Jose R Torrealba, Hannah V Carey
During the hibernation season, livers from 13-lined ground squirrels (Ictidomys tridecemlineatus) are resistant to damage induced by ex vivo, cold ischemia-warm reperfusion (IR) compared with livers from summer squirrels or rats. Here, we tested the hypothesis that hibernation also reduces damage to ground squirrel livers in an in vivo, warm IR model, which more closely resembles complications associated with traumatic injury or surgical interventions. We also examined whether protection is mediated by two metabolites, inosine and biliverdin, that are elevated in ground squirrel liver during interbout arousals...
January 31, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/28120944/identification-of-cardiac-progenitors-that-survive-in-the-ischemic-human-heart-after-ventricular-myocyte-death
#13
Mariko Omatsu-Kanbe, Nozomi Nozuchi, Yuka Nishino, Ken-Ichi Mukaisho, Hiroyuki Sugihara, Hiroshi Matsuura
Atypically-shaped cardiomyocytes (ACMs) are beating heart cells identified in the cultures of cardiomyocyte-removed fractions obtained from adult mouse hearts. Since ACMs spontaneously develop into beating cells in the absence of hormones or chemicals, these cells are likely to be a type of cardiac progenitors rather than stem cells. "Native ACMs" are found as small interstitial cells among ventricular myocytes that co-express cellular prion protein (PrP) and cardiac troponin T (cTnT) in mouse and human heart tissues...
January 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28120237/hibernating-substrate-of-ventricular-tachycardia-a-three-dimensional-metabolic-and-electro-anatomic-assessment
#14
Ayman A Hussein, Michelle Niekoop, Vasken Dilsizian, Yousra Ghzally, Mohammed Abdulghani, Ramazan Asoglu, Wengen Chen, Mark Smith, Vincent See, Stephen R Shorofsky, Timm-Michael Dickfeld
PURPOSE: Hibernating myocardium (HM) is associated with sudden cardiac death (SCD). Little is known about the electrophysiological properties of HM and the basis of its association with SCD. We aimed to electrophysiologically characterize HM in patients with ventricular tachycardia (VT). METHODS: Endocardial voltage mapping, metabolic (18)FDG-positron emission tomography (PET) and perfusion (82)Rb, (201)Tl, or (99m)Tc scans were performed in 61 ischemic heart disease patients with VT...
January 25, 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/28096431/activation-of-respiratory-muscles-does-not-occur-during-cold-submergence-in-bullfrogs-lithobates-catesbeianus
#15
Joseph M Santin, Lynn K Hartzler
Semiaquatic frogs may not breathe air for several months because they overwinter in ice-covered ponds. In contrast to many vertebrates that experience decreased motor performance after inactivity, respiratory motor function in bullfrogs, Lithobates catesbeianus, remains functional following cold-submergence. Unlike mammalian hibernators with unloaded limb muscles and inactive locomotor systems, respiratory mechanics of frogs counterintuitively allow for ventilatory maneuvers when submerged. Thus we hypothesized that bullfrogs generate respiratory motor patterns during cold-submergence to avoid disuse and preserve motor performance...
January 17, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28094804/six-years-in-the-life-of-a-mother-bear-the-longest-continuous-heart-rate-recordings-from-a-free-ranging-mammal
#16
Timothy G Laske, Paul A Iaizzo, David L Garshelis
Physiological monitoring of free-ranging wild animals is providing new insights into their adaptations to a changing environment. American black bears (Ursus americanus) are highly adaptable mammals, spending up to half the year hibernating, and the remainder of the year attempting to gain weight on a landscape with foods that vary seasonally and year to year. We recorded heart rate (HR) and corresponding activity of an adult female black bear over the course of six years, using an implanted monitor. Despite yearly differences in food, and an every-other year reproductive cycle, this bear exhibited remarkable consistency in HR and activity...
January 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28080983/snake-fungal-disease-an-emerging-threat-to-wild-snakes
#17
REVIEW
Jeffrey M Lorch, Susan Knowles, Julia S Lankton, Kathy Michell, Jaime L Edwards, Joshua M Kapfer, Richard A Staffen, Erik R Wild, Katie Z Schmidt, Anne E Ballmann, Doug Blodgett, Terence M Farrell, Brad M Glorioso, Lisa A Last, Steven J Price, Krysten L Schuler, Christopher E Smith, James F X Wellehan, David S Blehert
Since 2006, there has been a marked increase in the number of reports of severe and often fatal fungal skin infections in wild snakes in the eastern USA. The emerging condition, referred to as snake fungal disease (SFD), was initially documented in rattlesnakes, where the infections were believed to pose a risk to the viability of affected populations. The disease is caused by Ophidiomyces ophiodiicola, a fungus recently split from a complex of fungi long referred to as the Chrysosporium anamorph of Nannizziopsis vriesii (CANV)...
December 5, 2016: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28080982/drivers-of-variation-in-species-impacts-for-a-multi-host-fungal-disease-of-bats
#18
Kate E Langwig, Winifred F Frick, Joseph R Hoyt, Katy L Parise, Kevin P Drees, Thomas H Kunz, Jeffrey T Foster, A Marm Kilpatrick
Disease can play an important role in structuring species communities because the effects of disease vary among hosts; some species are driven towards extinction, while others suffer relatively little impact. Why disease impacts vary among host species remains poorly understood for most multi-host pathogens, and factors allowing less-susceptible species to persist could be useful in conserving highly affected species. White-nose syndrome (WNS), an emerging fungal disease of bats, has decimated some species while sympatric and closely related species have experienced little effect...
December 5, 2016: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28077390/reversible-temperature-dependent-differences-in-brown-adipose-tissue-respiration-during-torpor-in-a-mammalian-hibernator
#19
Sarah Victoria McFarlane, Katherine E Mathers, James F Staples
While seasonal modifications of brown adipose tissue (BAT) in hibernators are well documented, we know little about functional regulation of BAT in different phases of hibernation. In the 13-lined ground squirrel, liver mitochondrial respiration is suppressed by up to 70% during torpor. This suppression is reversed during arousal an°°d interbout euthermia (IBE), and corresponds with patterns of maximal activities of electron transport system (ETS) enzymes. Uncoupling of BAT mitochondria is controlled by free-fatty acid release stimulated by sympathetic activation of adipocytes, so we hypothesized that further regulation at the level of the ETS would be of little advantage...
January 11, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28077389/enhanced-oxidative-capacity-of-ground-squirrel-brain-mitochondria-during-hibernation
#20
Mallory A Ballinger, Christine Schwartz, Matthew T Andrews
During hibernation, thirteen-lined ground squirrels (Ictidomys tridecemlineatus) regularly cycle between bouts of torpor and interbout arousal (IBA).  Most of the brain is electrically quiescent during torpor, but regains activity quickly upon arousal to IBA resulting in extreme oscillations in energy demand during hibernation.  We predicted increased functional capacity of brain mitochondria during hibernation compared to spring to accommodate the variable energy demands of hibernation.  To address this hypothesis, we examined mitochondrial bioenergetics in the ground squirrel brain across three time points: spring (SP), torpor (TOR), and IBA...
January 11, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
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