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https://www.readbyqxmd.com/read/29135465/thermally-activated-trp-channels-molecular-sensors-for-temperature-detection
#1
Karen Castillo, Ignacio Diaz-Franulic, Jonathan Canan, Fernando Gonzalez-Nilo, Ramon Latorre
Temperature sensing is one of the most ancient capabilities of living organisms and is essential to sustain life, because failures in avoiding extreme noxious temperatures can result in tissue damage or death. A subset of members of the transient receptor potential (TRP) ion channel family is finely tuned to detect temperatures ranging from extreme cold to noxious heat, giving rise to thermoTRP channels. Structural and functional experiments have shown that thermoTRP channels are allosteric proteins, containing different domains that sense changes in temperature, among other stimuli, triggering pore opening...
November 14, 2017: Physical Biology
https://www.readbyqxmd.com/read/29129702/fkbp8-protects-the-heart-from-hemodynamic-stress-by-preventing-the-accumulation-of-misfolded-proteins-and-endoplasmic-reticulum-associated-apoptosis-in-mice
#2
Tomofumi Misaka, Tomokazu Murakawa, Kazuhiko Nishida, Yosuke Omori, Manabu Taneike, Shigemiki Omiya, Chris Molenaar, Yoshihiro Uno, Osamu Yamaguchi, Junji Takeda, Ajay M Shah, Kinya Otsu
Protein quality control in cardiomyocytes is crucial to maintain cellular homeostasis. The accumulation of damaged organelles, such as mitochondria and misfolded proteins in the heart is associated with heart failure. During the process to identify novel mitochondria-specific autophagy (mitophagy) receptors, we found FK506-binding protein 8 (FKBP8), also known as FKBP38, shares similar structural characteristics with a yeast mitophagy receptor, autophagy-related 32 protein. However, knockdown of FKBP8 had no effect on mitophagy in HEK293 cells or H9c2 myocytes...
November 9, 2017: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/29114011/albuterol-delivery-efficiency-in-a-pediatric-model-of-noninvasive-ventilation-with-double-limb-circuit
#3
Jeanne Velasco, Ariel Berlinski
BACKGROUND: Noninvasive ventilation (NIV) is used to treat respiratory failure in patients with concomitant need for aerosol delivery. Limited pediatric data are available on aerosol delivery efficiency, and none at all regarding aerosol delivery efficiency with a double-limb circuit. We compared the effect of position in the double-limb ventilator circuit, types of nebulizer, and ventilator settings on aerosol delivery efficiency in a pediatric model of NIV. We hypothesized that placing a vibrating mesh nebulizer at the ventilator and using the highest inspiratory pressures would increase aerosol delivery efficiency...
November 7, 2017: Respiratory Care
https://www.readbyqxmd.com/read/29089254/biocompatibility-and-degradation-properties-of-we43-mg-alloys-with-and-without-heat-treatment-in%C3%A2-vivo-evaluation-and-comparison-in-a-cranial-bone-sheep-model
#4
Andrea Torroni, Chongchen Xiang, Lukasz Witek, Eduardo D Rodriguez, Paulo G Coelho, Nikhil Gupta
PURPOSE: Orthopedic and maxillofacial bone fractures are routinely treated by titanium internal fixation, which may be prone to exposure, infection or intolerance. Magnesium (Mg) and its alloys represent promising alternatives to produce biodegradable osteosynthesis devices, with biocompatibility and, specifically, hydrogen gas production during the degradation process, being the main drawback. Aim of this study is to test and compare biocompatibility, degradation rate and physiscochemical properties of two Mg-alloys to identify which one possesses the most suitable characteristics to be used as resorbable hardware in load-bearing fracture sites...
September 28, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29079532/virulence-of-entomopathogenic-bacteria-in-the-bed-bug-cimex-lectularius
#5
Jose E Pietri, Dangsheng Liang
Due in part to the development of insecticide resistance, the common bed bug, Cimex lectularius, has overcome human intervention efforts to make a global resurgence. The failure of chemical pesticides has created a need for novel strategies to combat bed bugs. While a number of insect pests are susceptible to the use of entomopathogenic microbes or microbial-derived toxins, biological control methods have not been thoroughly explored in bed bugs. Here, we tested the virulence of three entomopathogenic bacterial species in C...
October 24, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/29078393/hspb7-is-indispensable-for-heart-development-by-modulating-actin-filament-assembly
#6
Tongbin Wu, Yongxin Mu, Julius Bogomolovas, Xi Fang, Jennifer Veevers, Roberta B Nowak, Christopher T Pappas, Carol C Gregorio, Sylvia M Evans, Velia M Fowler, Ju Chen
Small heat shock protein HSPB7 is highly expressed in the heart. Several mutations within HSPB7 are associated with dilated cardiomyopathy and heart failure in human patients. However, the precise role of HSPB7 in the heart is still unclear. In this study, we generated global as well as cardiac-specific HSPB7 KO mouse models and found that loss of HSPB7 globally or specifically in cardiomyocytes resulted in embryonic lethality before embryonic day 12.5. Using biochemical and cell culture assays, we identified HSPB7 as an actin filament length regulator that repressed actin polymerization by binding to monomeric actin...
November 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29066588/effect-of-high-flow-nasal-cannula-on-expiratory-pressure-and-ventilation-in-infant-pediatric-and-adult-models
#7
Katie R Nielsen, Laura E Ellington, Alan J Gray, Larissa I Stanberry, Lincoln S Smith, Robert M DiBlasi
BACKGROUND: Heated and humidified high-flow nasal cannula (HFNC) is a widely used form of respiratory support; however, data regarding optimal flows for a given patient size or disease state are lacking. A comprehensive study of the physiologic effects of HFNC is needed to better understand the mechanisms of action. The objective of the current study was to quantify the effect of HFNC settings in age-specific, anatomically correct nasal airways and spontaneously breathing lung models...
October 24, 2017: Respiratory Care
https://www.readbyqxmd.com/read/29065950/indices-of-heart-rate-variability-as-potential-early-markers-of-metabolic-stress-and-compromised-regulatory-capacity-in-dried-off-high-yielding-dairy-cows
#8
S Erdmann, E Mohr, M Derno, A Tuchscherer, C Schäff, S Börner, U Kautzsch, B Kuhla, H M Hammon, M Röntgen
High performing dairy cows experience distinct metabolic stress during periods of negative energy balance. Subclinical disorders of the cow's energy metabolism facilitate failure of adaptational responses resulting in health problems and reduced performance. The autonomic nervous system (ANS) with its sympathetic and parasympathetic branches plays a predominant role in adaption to inadequate energy and/or fuel availability and mediation of the stress response. Therefore, we hypothesize that indices of heart rate variability (HRV) that reflect ANS activity and sympatho-vagal balance could be early markers of metabolic stress, and possibly useful to predict cows with compromised regulatory capacity...
October 25, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/29052864/short-term-hypoxia-upregulated-mas-receptor-expression-to-repress-the-at1-r-signaling-pathway-and-attenuate-ang-ii-induced-cardiomyocyte-apoptosis
#9
Ruey-Lin Chang, Chih-Fen Chang, Da-Tong Ju, Tsung-Jung Ho, Tung-Ti Chang, Jing-Wei Lin, Jia-Chun Le, Shiu-Min Cheng, Cecilia-Hsuan Day, V Vijaya Padma, Chih-Yang Huang
Hypertension-stimulated cardiac hypertrophy and apoptosis play critical roles in the progression of heart failure. Our previous study suggested that hypertensive angiotensin II (Ang II) enhanced insulin-like growth factor receptor II (IGF-IIR) expression and cardiomyocyte apoptosis, which are involved JNK activation, sirtuin1 (SIRT1) degradation, and heat-shock transcription factor 1 (HSF1) acetylation. Moreover, previous studies have implied that short-term hypoxia (STH) might exert cardioprotective effects...
October 20, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29040221/thermoeffector-responses-at-a-fixed-rate-of-heat-production-in-heart-failure-patients
#10
Bryce N Balmain, Ollie Jay, Norman R Morris, Kenji Shiino, Glenn M Stewart, Rohan Jayasinghe, Jonathan Chan, Surendran Sabapathy
PURPOSE: Heart failure (HF) patients appear to exhibit altered thermoregulatory responses during exercise in the heat. However, the extent to which these responses are altered due to physiological impairments independently of biophysical factors associated with differences in metabolic heat production (Hprod), evaporative heat balance requirements (Ereq) and/or body size, is presently unclear. Therefore, we examined thermoregulatory responses in 10 HF and 10 age-matched controls (CON) similar in body size during exercise at a fixed rate of Hprod, and therefore Ereq in a 30°C environment...
October 16, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29037393/aerobic-function-in-mitochondria-persists-beyond-death-by-heat-stress-in-insects
#11
Erica C Heinrich, Emilie M Gray, Ashley Ossher, Stephen Meigher, Felix Grun, Timothy J Bradley
The critical thermal maximum (CTmax) of insects can be determined using flow-through thermolimit respirometry. It has been demonstrated that respiratory patterns cease and insects do not recover once the CTmax temperature has been reached. However, if high temperatures are maintained following the CTmax, researchers have observed a curious phenomenon whereby the insect body releases a large burst of carbon dioxide at a rate and magnitude that often exceed that of the live insect. This carbon dioxide release has been termed the post-mortal peak (PMP)...
October 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29028771/mechanisms-of-thrombocytopenia-during-septic-shock-a-multiplex-cluster-analysis-of-endogenous-sepsis-mediators
#12
Alexandre Bedet, Keyvan Razazi, Florence Boissier, Mathieu Surenaud, Sophie Hue, Stéphane Giraudier, Christian Brun-Buisson, Armand Mekontso Dessap
BACKGROUND: Thrombocytopenia is a common feature of sepsis and may involve various mechanisms often related to the inflammatory response. This study aimed at evaluating factors associated with thrombocytopenia during human septic shock. In particular, we used a multiplex analysis to assess the role of endogenous sepsis mediators. METHODS: Prospective, observational study. Thrombocytopenia was defined as an absolute platelet count <100 G/L or a 50% relative decrease in platelet count during the first week of septic shock...
October 12, 2017: Shock
https://www.readbyqxmd.com/read/28978590/liver-transplantation-for-non-exertional-heat-stroke-related-acute-liver-failure
#13
Sandra Coenen, Khe Tran, Jubi de Haan, Rob de Man
Heat stroke is a life-threatening condition characterised by hyperthermia leading to multiple organ dysfunction. Acute liver failure is a rare and potentially fatal consequence of heat stroke. Management of heat stroke is mainly supportive but liver transplantation can be considered as the treatment of acute liver failure in heat stroke. However, literature on liver transplantation as a treatment for acute liver failure in heat stroke is scarce. Until now, no cases of liver transplantation for acute liver failure in non-exertional heat stroke have been reported...
October 4, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28977653/to-compare-the-efficacy-of-heated-humidified-high-flow-nasal-cannula-and-continuous-positive-airway-pressure-in-post-extubation-period-in-vlbw-infants
#14
Bhawan Deep Garg, Naveen Bajaj, Deepak Sharma
Objective: The objective of this study was to compare efficacy of continuous positive airway pressure (CPAP) and heated humidified high-flow nasal cannula (HHHFNC) as noninvasive respiratory support in post-extubation period in very low birth weight (VLBW) infants. Method: This retrospective study enrolled 136 neonates, ≤32 weeks gestation and ≤1500 grams birth weight, requiring noninvasive respiratory support during post-extubation period. Results: There was no significant difference in post-extubation failure in HHHFNC group when compared with CPAP group ( p  > 0...
August 8, 2017: Journal of Tropical Pediatrics
https://www.readbyqxmd.com/read/28973020/dynamic-adaptation-of-myocardial-proteome-during-heart-failure-development
#15
Julia Rüdebusch, Alexander Benkner, Axel Poesch, Marcus Dörr, Uwe Völker, Karina Grube, Elke Hammer, Stephan B Felix
Heart failure (HF) development is characterized by huge structural changes that are crucial for disease progression. Analysis of time dependent global proteomic adaptations during HF progression offers the potential to gain deeper insights in the disease development and identify new biomarker candidates. Therefore, hearts of TAC (transverse aortic constriction) and sham mice were examined by cardiac MRI on either day 4, 14, 21, 28, 42, and 56 after surgery (n = 6 per group/time point). At each time point, proteomes of the left (LV) and right ventricles (RV) of TAC and sham mice were analyzed by mass spectrometry (MS)...
2017: PloS One
https://www.readbyqxmd.com/read/28964966/ambient-temperature-and-added-heat-wave-effects-on-hospitalizations-in-california-from-1999-to-2009
#16
Toki Sherbakov, Brian Malig, Kristen Guirguis, Alexander Gershunov, Rupa Basu
Investigators have examined how heat waves or incremental changes in temperature affect health outcomes, but few have examined both simultaneously. We utilized distributed lag nonlinear models (DLNM) to explore temperature associations and evaluate possible added heat wave effects on hospitalizations in 16 climate zones throughout California from May through October 1999-2009. We define heat waves as a period when daily mean temperatures were above the zone- and month-specific 95th percentile for at least two consecutive days...
September 28, 2017: Environmental Research
https://www.readbyqxmd.com/read/28955443/solar-thermotherapy-reduces-the-titer-of-candidatus-liberibacter-asiaticus-and-enhances-canopy-growth-by-altering-gene-expression-profiles-in-hlb-affected-citrus-plants
#17
Melissa M Doud, Yungsheng Wang, Michelle T Hoffman, Christina L Latza, Weiqi Luo, Cheryl M Armstrong, Tim R Gottwald, Liangying Dai, Feng Luo, Yongping Duan
Huanglongbing (HLB), a systemic and destructive disease of citrus, is associated with 'Candidatus Liberibacter asiaticus' (Las) in the United States. Our earlier work has shown that Las bacteria were significantly reduced or eliminated when potted HLB-affected citrus were continuously exposed to high temperatures of 40 to 42 °C for a minimum of 48 h. To determine the feasibility and effectiveness of solar thermotherapy in the field, portable plastic enclosures were placed over commercial and residential citrus, exposing trees to high temperatures through solarization...
2017: Horticulture Research
https://www.readbyqxmd.com/read/28949703/skyrme-insulators-insulators-at-the-brink-of-superconductivity
#18
Onur Erten, Po-Yao Chang, Piers Coleman, Alexei M Tsvelik
Current theories of superfluidity are based on the idea of a coherent quantum state with topologically protected quantized circulation. When this topological protection is absent, as in the case of ^{3}He-A, the coherent quantum state no longer supports persistent superflow. Here, we argue that the loss of topological protection in a superconductor gives rise to an insulating ground state. We specifically introduce the concept of a Skyrme insulator to describe the coherent dielectric state that results from the topological failure of superflow carried by a complex-vector order parameter...
August 4, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28946962/high-temperatures-and-nephrology-the-climate-change-problem
#19
Alberto de Lorenzo, Fernando Liaño
It is well known that climate change greatly affects human health, even though there are few studies on renal outcomes. Heat waves have been found to increase cardiovascular and respiratory morbidity and mortality, as well as the risk of acute renal failure and hospitalisation due to renal diseases, with related mortality. Recurrent dehydration in people regularly exposed to high temperatures seems to be resulting in an unrecognised cause of proteinuric chronic kidney disease, the underlying pathophysiological mechanism of which is becoming better understood...
September 2017: Nefrología: Publicación Oficial de la Sociedad Española Nefrologia
https://www.readbyqxmd.com/read/28937603/proteome-stability-as-a-key-factor-of-genome-integrity
#20
REVIEW
Sentiljana Gumeni, Zoi Evangelakou, Vassilis G Gorgoulis, Ioannis P Trougakos
DNA damage is constantly produced by both endogenous and exogenous factors; DNA lesions then trigger the so-called DNA damaged response (DDR). This is a highly synchronized pathway that involves recognition, signaling and repair of the damage. Failure to eliminate DNA lesions is associated with genome instability, a driving force in tumorigenesis. Proteins carry out the vast majority of cellular functions and thus proteome quality control (PQC) is critical for the maintenance of cellular functionality. PQC is assured by the proteostasis network (PN), which under conditions of proteome instability address the triage decision of protein fold, hold, or degrade...
September 22, 2017: International Journal of Molecular Sciences
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