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https://www.readbyqxmd.com/read/28732027/serum-irisin-and-myostatin-levels-after-2-weeks-of-high-altitude-climbing
#1
Ewa Śliwicka, Tomasz Cisoń, Zbigniew Kasprzak, Alicja Nowak, Łucja Pilaczyńska-Szcześniak
Exposure to high-altitude hypoxia causes physiological and metabolic adaptive changes by disturbing homeostasis. Hypoxia-related changes in skeletal muscle affect the closely interconnected energy and regeneration processes. The balance between protein synthesis and degradation in the skeletal muscle is regulated by several molecules such as myostatin, cytokines, vitamin D, and irisin. This study investigates changes in irisin and myostatin levels in male climbers after a 2-week high-altitude expedition, and their association with 25(OH)D and indices of inflammatory processes...
2017: PloS One
https://www.readbyqxmd.com/read/28730509/effect-of-a-2000-m-running-test-on-antioxidant-and-cytokine-response-in-plasma-and-circulating-cells
#2
Lucrecia Carrera-Quintanar, Lorena Funes, Miguel Sánchez-Martos, Pascual Martinez-Peinado, José M Sempere, Antoni Pons, Vicente Micol, Enrique Roche
Exercise intensity usually correlates with increased oxidative stress and enhanced cytokine production. However, it is unknown if all types of exercise that induce muscle damage can cause a parallel response in the oxidation balance and cytokine production. To this end, the effect of a 2000-m running test in a group of volunteers that regularly train in aerobic routines was studied. Different circulating parameters were measured, oxidative stress markers (protein carbonyls and malondialdehyde), antioxidant enzyme activity, and cytokine levels in plasma as well as in the main circulating cells of blood samples obtained in basal conditions and after test execution...
July 20, 2017: Journal of Physiology and Biochemistry
https://www.readbyqxmd.com/read/28728400/studies-on-meat-color-myoglobin-content-enzyme-activities-and-genes-associated-with-oxidative-potential-of-pigs-slaughtered-at-different-growth-stages
#3
Qin Ping Yu, Ding Yuan Feng, Juan Xiao, Fan Wu, Xiao Jun He, Min Hao Xia, Tao Dong, Yi Hua Liu, Hui Ze Tan, Shi Geng Zou, Tao Zheng, Xian Hua Ou, Jian Jun Zuo
Objective: This experiment was conducted to investigate meat color, myoglobin (Mb) content, enzyme activities, and expression of genes associated with oxidative potential of pigs slaughtered at different growth stages. Methods: Sixty 4-week-old Duroc × Landrace × Yorkshire pigs were assigned to 6 replicate groups, each containing 10 pigs. One pig from each group was sacrificed at day 35, 63, 98, and 161 to isolate longissimus dorsi and triceps muscles. Results: Meat color scores were higher in pigs at 35 d than those at 63 d and 98 d (P < 0...
May 14, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28723610/pediatric-reference-intervals-for-29-ortho-vitros-5600-immunoassays-using-the-caliper-cohort-of-healthy-children-and-adolescents
#4
Victoria Higgins, Angela W S Fung, Man Khun Chan, Joseph Macri, Khosrow Adeli
BACKGROUND: Accurate reference intervals (RIs) based on a healthy pediatric population are essential for pediatric test result interpretation. The CALIPER project has recruited a large healthy cohort and completed a series of a priori studies to address gaps in pediatric RIs. As immunoassays from different manufacturers for endocrine and special chemistry markers are not standardized and show marked intermethod differences, direct RI studies are needed for each major analytical platform...
July 19, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28721671/front-end-electron-transfer-dissociation-coupled-to-a-21-tesla-ft-icr-mass-spectrometer-for-intact-protein-sequence-analysis
#5
Chad R Weisbrod, Nathan K Kaiser, John E P Syka, Lee Early, Christopher Mullen, Jean-Jacques Dunyach, A Michelle English, Lissa C Anderson, Greg T Blakney, Jeffrey Shabanowitz, Christopher L Hendrickson, Alan G Marshall, Donald F Hunt
High resolution mass spectrometry is a key technology for in-depth protein characterization. High-field Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) enables high-level interrogation of intact proteins in the most detail to date. However, an appropriate complement of fragmentation technologies must be paired with FTMS to provide comprehensive sequence coverage, as well as characterization of sequence variants, and post-translational modifications. Here we describe the integration of front-end electron transfer dissociation (FETD) with a custom-built 21 tesla FT-ICR mass spectrometer, which yields unprecedented sequence coverage for proteins ranging from 2...
July 18, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28716186/formation-of-protein-surfactant-adsorption-layer-as-studied-by-dilational-surface-rheology
#6
REVIEW
Boris A Noskov, Michael M Krycki
The review discusses the mechanism of formation of protein/surfactant adsorption layers at the liquid - gas interface. The complexes of globular proteins usually preserve their compact structure a low surfactant concentrations. Therefore a simple kinetic model of the adsorption of charged compact nanoparticles is discussed first and compared with experimental data. The increase of surfactant concentrations results in various conformational transitions in the surface layer. One can obtain information on the changes of the adsorption layer structure using the dilational surface rheology...
July 6, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28714586/activation-of-autophagy-is-involved-in-the-protective-effect-of-17%C3%AE-oestradiol-on-endotoxaemia-induced-multiple-organ-dysfunction-in-ovariectomized-rats
#7
Ming-Tzeung Chung, Yen-Mei Lee, Hsin-Hsueh Shen, Pao-Yun Cheng, Yu-Chen Huang, Yu-Ju Lin, Yu-Yang Huang, Kwok-Keung Lam
Oestrogens have been reported to attenuate acute inflammation in sepsis. In this study, the effects of long-term oestrogen replacement with 17β-oestradiol (E2 ) on endotoxaemia-induced circulatory dysfunction and multiple organ dysfunction syndrome were evaluated in ovariectomized (Ovx) rats. E2 (50 μg/kg, s.c., 3 times/week) was administered for 8 weeks, followed by the induction of endotoxaemia by intravenous infusion of lipopolysaccharides (LPS; 30 mg/kg/4 hrs). Oestrogen deficiency induced by ovariectomy for 9 weeks augmented the LPS-induced damage, including endotoxic shock, myocardial contractile dysfunction, renal dysfunction and rhabdomyolysis...
July 17, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28713460/effects-of-an-elastic-hamstring-assistance-device-during-downhill-running
#8
Randy L Aldret, Brittany A Trahan, Greggory Davis, Brian Campbell, David M Bellar
The purpose of this study was to determine the appropriateness of using an elastic hamstring assistance device to reduce perceived levels of soreness, increase isometric strength, increase passive range of motion, and decrease biomarkers of muscle damage after eccentric exercise, specifically, downhill running This study was conducted in a university exercise physiology laboratory placing sixteen apparently healthy males (X = 21.6 ± 2.5 years) into two groups using a pre-test/post-test design. Pre-intervention measures taken included participants' body height, body mass, body fat, capillary blood samples, VO2max, isometric hamstring strength at 45 and 90 degrees of flexion and passive hamstring range of motion...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28709800/detection-of-autoantibodies-to-3-hydroxy-3-methylglutaryl-coenzyme-a-reductase-by-elisa-in-a-reference-laboratory-setting
#9
Troy D Jaskowski, Sonia L La'ulu, Michael Mahler, Anne E Tebo
BACKGROUND: We investigated the performance of an ELISA for the detection of 3-hydroxy-3-methyl-glutaryl-coenzyme A reductase (HMGCR) IgG antibodies in immune-mediated necrotizing myopathies (IMNM). METHODS: Patients positive for HMGCR antibodies (n=61) or negative (n=78) by protein immunoprecipitation (IP), and healthy controls (n=100) were used to evaluate the ELISA. Unique consecutive serum samples (n=155) received at ARUP Laboratories for HMGCR IgG testing by ELISA were also investigated and analysed for serum muscle enzymes (aldolase, creatine kinase, and myoglobin)...
July 11, 2017: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/28707888/mechanism-of-initiation-association-and-formation-of-amyloid-fibrils-modeled-with-the-n-terminal-peptide-fragment-ikylefis-of-myoglobin-g-helix
#10
Sunita Patel, Yellamraju U Sasidhar, Kandala V R Chary
Some peptides and proteins undergo self-aggregation under certain conditions, leading to amyloid fibrils formation, which is related to many disease conditions. It is important to understand such amyloid fibrils formation to provide mechanistic detail that governs the process. A predominantly α-helical myoglobin has been reported recently to readily form amyloid fibrils at a higher temperature, similar to its G-helix segment. Here, we have investigated the mechanism of amyloid fibrils formation by performing multiple long molecular dynamics simulations (27 μs) on the N-terminal segment of the G-helix of myoglobin...
July 14, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28704479/dynamic-changes-in-bach1-expression-in-the-kidney-of-rhabdomyolysis-associated-acute-kidney-injury
#11
Masakazu Yamaoka, Hiroko Shimizu, Toru Takahashi, Emiko Omori, Hiroshi Morimatsu
Free heme, a pro-oxidant released from myoglobin, is thought to contribute to the pathogenesis of rhabdomyolysis-associated acute kidney injury (RM-AKI), because renal overexpression of heme oxygenase-1 (HO-1), the rate-limiting enzyme in heme catabolism, confers protection against RM-AKI. BTB and CNC homology 1 (Bach1) is a heme-responsive transcription factor that represses HO-1. Here, we examined the changes with time in the gene expression of Bach1, HO-1, and δ-aminolevulinate synthase (ALAS1, a heme biosynthetic enzyme) in the rat kidney using an RM-AKI model induced by the injection of 50% glycerol (10 mL/kg body weight) into bilateral limbs...
2017: PloS One
https://www.readbyqxmd.com/read/28702438/examination-of-levels-pentraxin-3-interleukin-6-and-c-reactive-protein-in-rat-model-acute-and-chronic-exercise
#12
Melek Tunc-Ata, Gunfer Turgut, Mukaddes Mergen-Dalyanoglu, Sebahat Turgut
Different types of exercise occurs damage at the cellular level in the muscles. Muscle damage caused by exercise is determined creatine kinase, myoglobin, and increase in levels of acute phase protein and interleukin in blood. The purpose of this study was investigated the levels of pentraxin-3 (PTX-3), interleukin-6 (IL-6), and C-reactive protein (CRP) following acute and chronic exercising in rats. Twenty-six Wistar Albino male rats were divided in to three groups. A treadmill exercise was performed 3 days/week, 10 min/day for 1 week in acute groups...
June 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/28700223/metabolomics-profiling-to-determine-the-effect-of-postmortem-aging-on-color-and-lipid-oxidative-stabilities-of-different-bovine-muscles
#13
Danyi Ma, Yuan H Brad Kim, Bruce R Cooper, Ji-Hwan Oh, Hyonho Chun, Juhui Choe, J P Schoonmaker, Kolapo Matthew Ajuwon, Byungrok Min
The objective of this study was to identify the metabolites that could be associated with oxidative stability of aged bovine muscles. Three muscles (longissimus lumbrum (LL), semimembranosus (SM), and psoas major (PM)) from 7 beef carcasses at 1 day postmortem were divided into three sections and assigned to three aging periods (9, 16 and 23 days). While an increase in discoloration was found in all muscles with aging, LL was the most color/lipid oxidative stable, followed by SM and PM (P < 0.05). Lower myoglobin and non-heme iron contents were observed in LL compared to SM and PM (P < 0...
July 12, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28699064/joule-heating-and-thermal-denaturation-of-proteins-in-nano-esi-theta-tips
#14
Feifei Zhao, Sarah M Matt, Jiexun Bu, Owen G Rehrauer, Dor Ben-Amotz, Scott A McLuckey
Electro-osmotically induced Joule heating in theta tips and its effect on protein denaturation were investigated. Myoglobin, equine cytochrome c, bovine cytochrome c, and carbonic anhydrase II solutions were subjected to electro-osmosis in a theta tip and all of the proteins were denatured during the process. The extent of protein denaturation was found to increase with the applied square wave voltage and electrolyte concentration. The solution temperature at the end of a theta tip was measured directly by Raman spectroscopy and shown to increase with the square wave voltage, thereby demonstrating the effect of Joule heating through an independent method...
July 11, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28697886/revisiting-the-structure-of-haemoglobin-and-myoglobin-with-cryo-electron-microscopy
#15
REVIEW
Maryam Khoshouei, Radostin Danev, Juergen M Plitzko, Wolfgang Baumeister
Sixty years ago the first protein structure was determined by John Kendrew and his colleagues, that of myoglobin; haemoglobin followed shortly thereafter. For quite some time it seemed that only X-ray crystallography would be capable of determining the structure of proteins to high resolution. In recent years, cryo- electron microscopy has emerged as a viable alternative and indeed in many cases the preferred approach. It is capable of studying proteins which span a size range from several megadaltons to proteins as small as myoglobin and haemoglobin...
July 8, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/28695211/solving-protein-structures-using-short-distance-cross-linking-constraints-as-a-guide-for-discrete-molecular-dynamics-simulations
#16
Nicholas I Brodie, Konstantin I Popov, Evgeniy V Petrotchenko, Nikolay V Dokholyan, Christoph H Borchers
We present an integrated experimental and computational approach for de novo protein structure determination in which short-distance cross-linking data are incorporated into rapid discrete molecular dynamics (DMD) simulations as constraints, reducing the conformational space and achieving the correct protein folding on practical time scales. We tested our approach on myoglobin and FK506 binding protein-models for α helix-rich and β sheet-rich proteins, respectively-and found that the lowest-energy structures obtained were in agreement with the crystal structure, hydrogen-deuterium exchange, surface modification, and long-distance cross-linking validation data...
July 2017: Science Advances
https://www.readbyqxmd.com/read/28693728/electrochemical-detection-of-cardiac-biomarker-myoglobin-using-polyphenol-as-imprinted-polymer-receptor
#17
J A Ribeiro, C M Pereira, A F Silva, M Goreti F Sales
An electrochemical biosensor was developed by merging the features of Molecular Imprinting technique and Screen-Printed Electrode (SPE) for the simple and fast screening of cardiac biomarker myoglobin (Myo) in point-of-care (POC). The MIP artificial receptor for Myo was prepared by electrooxidative polymerization of phenol (Ph) on a AuSPE in the presence of Myo as template molecule. The choice of the most effective protein extraction procedure from the various extraction methods tested (mildly acidic/basic solutions, pure/mixed organic solvents, solutions containing surfactants and enzymatic digestion methods), and the optimization of the thickness of the polymer film was carefully undertaken in order to improve binding characteristics of Myo to the imprinted polymer receptor and increase the sensitivity of the MIP biosensor...
August 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28692495/the-clinical-significance-of-technetium-99m-methylene-diphosphonate-bone-scintigraphy-findings-in-patients-with-rhabdomyolysis
#18
Jeong Won Lee, Eun-Young Lee, Sae-Yong Hong, Ik Dong Yoo, Sang Mi Lee
OBJECTIVE: This study evaluated the relationship between bone scintigraphy finding and clinical factors and assessed the prognostic value of bone scintigraphy finding in patients with rhabdomyolysis. PATIENTS AND METHODS: We retrospectively enrolled 143 patients with rhabdomyolysis who had undergone bone scintigraphy. Bone scintigraphy was classified into three groups: no or equivocal soft tissue uptake, a localized uptake, and a diffuse uptake. The relationship of bone scintigraphy findings with clinical factors was evaluated...
July 7, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28677871/well-leg-compartment-syndrome-after-laparoscopic-low-anterior-resection-for-lower-rectal-cancer-in-the-lithotomy-position-a-case-report
#19
Masaya Nishino, Miho Okano, Junji Kawada, Yongkook Kim, Mami Yamada, Toshimasa Tsujinaka
A 64-year-old man underwent laparoscopic low anterior resection for lower rectal cancer. Because he was overweight (BMI, 28.1 kg/m(2) ) with rich visceral fat and a narrow pelvic cavity, the operation was technically difficult and the operation time was 686 min. Postoperatively, the patient immediately complained of pain and swelling of the left lower limb. Laboratory examination showed that serum creatinine kinase was markedly increased and urine myoglobin was positive on postoperative day 1. He was diagnosed with well-leg compartment syndrome and was transported to the trauma and critical care center for emergency fasciotomy...
July 5, 2017: Asian Journal of Endoscopic Surgery
https://www.readbyqxmd.com/read/28675658/spectroscopic-study-of-the-interaction-between-horse-heart-myoglobin-and-zr-iv-substituted-polyoxometalates-as-artificial-proteases
#20
Tatjana N Parac-Vogt, Hong GiangHong Giang Thi Ly
Our recent study (Angew. Chem. Int. Ed. 2015, 54, 7391-7394) has shown that Horse heart myoglobin (HHM) was selectively hydrolyzed by a range of Zr(IV)-substituted polyoxometalates (POMs) under mild conditions. In this study the molecular interactions between the Zr-POM catalysts and HHM were investigated by using a range of complementary techniques that include circular dichroism (CD), UV-Vis spectroscopy, tryptophan fluorescence spectroscopy, 1H NMR and 31P NMR spectroscopy. Trp fluorescence quenching study revealed that among all examined Zr-POMs, the most reactive POM, 2:2 Zr(IV)-Keggin, exhibited the strongest interaction with HHM...
July 4, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
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