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https://www.readbyqxmd.com/read/28513289/detection-of-meat-species-adulteration-using-high-resolution-mass-spectrometry-and-a-proteogenomics-strategy
#1
Alberto Ruiz Orduna, Erik Husby, Charles T Yang, Dipankar Ghosh, Francis Beaudry
Due to the internationalization of food production and distribution, there has been a significant increase of food fraud in recent years. Food fraud can have serious health implications, and occurs when food manufacturers implement unethical practices such as making false label claims as well as using additives and fillers within their products to increase profitability. This has been a serious concern. Meat adulteration was examined using a well-defined proteogenomic annotation, carefully selected surrogate tryptic peptides and high-resolution mass spectrometry...
May 17, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28513179/consumption-of-watermelon-juice-enriched-in-l-citrulline-and-pomegranate-ellagitannins-enhanced-metabolism-during-physical-exercise
#2
Ascension Martinez-Sanchez, Fernando Alacid, Jacobo A Rubio-Arias, Bárbara Fernandez-Lobato, Domingo J Ramos-Campo, Encarna Aguayo
L-citrulline is a non-essential amino acid precursor of arginine and indirectly a precursor of nitric oxide (NO), which is a vasodilator and increases mitochondrial respiration. On the other hand, the antioxidant pomegranate ellagitannins are precursors of urolithin A, which has been associated with mitophagy and increased muscle function. To elucidate if a single dose of watermelon enrichment with these compounds have a positive effect after a high intensity exercise (8 sets of 8 repetitions of half squat exercise), a double-blind randomized crossover in vivo study was performed in healthy male subjects (n=19)...
May 17, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28502932/rhabdomyolysis-after-high-intensity-resistance-training
#3
Sakiko Honda, Tatsuya Kawasaki, Tadaaki Kamitani, Keisuke Kiyota
Rhabdomyolysis, which is a characteristic occurrence in associated with muscle cell necrosis, develops due to various causes. We herein report a rare case of a patient with rhabdomyolysis after high intensity resistance training, in which markedly elevated levels of serum creatine kinase (CK) and urine myoglobin were observed. A previously healthy 37-year-old man presented with severe myalgia and dark urine after performing high-intensity exercise. The patient's serum CK level was 95,100 U/L and his urine myoglobin level was 160,000 ng/mL...
2017: Internal Medicine
https://www.readbyqxmd.com/read/28502074/causes-and-consequences-of-mesenteric-embolization-after-endovascular-aorto-iliac-intervention-a-nested-case-control-study
#4
Stefan Acosta, Jussi Kärkkäinen
BACKGROUND: Causes and consequences of mesenteric embolization after endovascular aorto-iliac procedures have not been studied adequately. METHODS: Consecutive patients with mesenteric embolization after endovascular aorto-iliac intervention between 2011 and 2015 (case-group, n = 9) were investigated and compared with age, gender and procedure-matched random controls (n = 36). RESULTS: Compared to the control group, a higher proportion of patients with mesenteric embolization were current smokers (89% vs...
May 14, 2017: Anaesthesiology Intensive Therapy
https://www.readbyqxmd.com/read/28500193/viral-myositis-in-children
#5
Haley Magee, Ran D Goldman
Question I recently evaluated a child in my clinic after an emergency department visit where she presented having woken up that morning refusing to walk and was crawling around the house. The parents reported she was getting over a cold, and I recall similar cases of myositis during the H1N1 influenza epidemic a few years ago. What are the key features of myositis that I should recognize? Which investigations are needed to confirm the diagnosis and how should affected patients be managed? Answer Benign acute childhood myositis is a mild and self-limited sudden onset of lower extremity pain during or following recovery from a viral illness...
May 2017: Canadian Family Physician Médecin de Famille Canadien
https://www.readbyqxmd.com/read/28497398/early-markers-of-myocardial-ischemia-from-the-experimental-model-to-forensic-pathology-cases-of-sudden-cardiac-death
#6
Sara Sabatasso, Milena Moretti, Patrice Mangin, Tony Fracasso
The goal of this study was to assess whether early markers of myocardial ischemia, identified in a previous experimental work, can be applied in forensic pathology cases of sudden, ischemic cardiac death. These markers include desphosphorylated connexin 43 (Cx43), JunB, TUNEL assay, myoglobin, and troponin T. Fourteen cases of sudden cardiac death with gross and/or histological signs of myocardial infarction and 14 cases of sudden cardiac death with signs of early ischemia at histology and positive immunoreactions for fibronectin and C5b-9 were investigated...
May 11, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28497146/the-effect-of-the-buffer-solution-on-the-adsorption-and-stability-of-horse-heart-myoglobin-on-commercial-mesoporous-titanium-dioxide-a-matter-of-the-right-choice
#7
Stefano Loreto, Bert Cuypers, Jacotte Brokken, Sabine Van Doorslaer, Karolien De Wael, Vera Meynen
Despite the numerous studies on the adsorption of different proteins onto mesoporous titanium dioxide and indications on the important role of buffer solutions in bioactivity, a systematic study on the impact of the buffer on the protein incorporation into porous substrates is still lacking. We here studied the interaction between a commercial mesoporous TiO2 and three of the most used buffers for protein incorporation, i.e. HEPES, Tris and phosphate buffer. In addition, this paper analyzes the adsorption of horse heart myoglobin (hhMb) onto commercial mesoporous TiO2 as a model system to test the influence of buffers on the protein incorporation behavior in mesoporous TiO2...
May 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28488836/effects-of-low-load-resistance-exercise-with-blood-flow-restriction-on-intramuscular-hemodynamics-oxygenation-level-and-water-content
#8
Osamu Yanagisawa, Atsuki Fukutani
BACKGROUND: Muscle metabolism during and after low-load blood flow restriction (BFR) exercise should be further investigated to clarify the mechanism by which the exercise leads to muscle hypertrophy, and increases strength and endurance. We aimed to investigate the effects of low-load resistance exercise with BFR on intramuscular hemodynamics, oxygenation level, and water content. METHODS: Seven men performed ankle plantar flexion exercise (120 repetitions, 30% one repetition maximum) using a custom-made device with and without BFR inside a magnetic resonance scanner...
May 9, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28487743/delirium-and-high-creatine-kinase-and-myoglobin-levels-related-to-synthetic-cannabinoid-withdrawal
#9
Ahmet Bulent Yazici, Esra Yazici, Atila Erol
Synthetic cannabinoids (SCs) are included in a group of drugs called new psychoactive substances. Effects of SCs on the central nervous system are similar to other cannabinoids, but 2-100 times more potent than marijuana. Thus, addiction and withdrawal symptoms are more severe than natural cannabinoids. Withdrawal symptoms of SCs were reported in the literature previously. But there is no report about SC withdrawal delirium and its treatment. Several studies reported that agonists of CB1 receptors play a role in GABA and glutamatergic neurotransmission, which is similar to the effects of alcohol on GABA and glutamatergic receptors...
2017: Case Reports in Medicine
https://www.readbyqxmd.com/read/28471085/highly-charged-protein-ions-the-strongest-organic-acids-to-date
#10
Muhammad A Zenaidee, Michael G Leeming, Fangtong Zhang, Toby T Funston, William A Donald
The basicity of highly protonated cytochrome c (cyt c) and myoglobin (myo) ions were investigated using tandem mass spectrometry, ion-molecule reactions (IMRs), and theoretical calculations as a function of charge state. Surprisingly, highly charged protein ions (HCPI) can readily protonate non-polar molecules and inert gases, including Ar, O2 , and N2 in thermal IMRs. The most HCPIs that can be observed are over 130 kJ mol(-1) less basic than the least basic neutral organic molecules known (tetrafluoromethane and methane)...
May 4, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28470988/insights-into-how-heme-reduction-potentials-modulate-enzymatic-activities-of-a-myoglobin-based-functional-oxidase
#11
Ambika Bhagi-Damodaran, Maximilian Kahle, Yelu Shi, Yong Zhang, Pia Ädelroth, Yi Lu
Heme-copper oxidase (HCO) is a class of respiratory enzymes that use a heme-copper center to catalyze O2 reduction to H2 O. While heme reduction potential (E°') of different HCO types has been found to vary >500 mV, its impact on HCO activity remains poorly understood. Here, we use a set of myoglobin-based functional HCO models to investigate the mechanism by which heme E°' modulates oxidase activity. Rapid stopped-flow kinetic measurements show that increasing heme E°' by ca. 210 mV results in increases in electron transfer (ET) rates by 30-fold, rate of O2 binding by 12-fold, O2 dissociation by 35-fold, while decreasing O2 affinity by 3-fold...
May 4, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28469752/il-6-antioxidant-capacity-and-muscle-damage-markers-following-high-intensity-interval-training-protocols
#12
Lukas Cipryan
The aim of this study was to investigate changes of interleukin-6 (IL-6), total antioxidant capacity (TAC) and muscle damage markers (creatine kinase (CK), myoglobin and lactate dehydrogenase (LDH)) in response to three different high-intensity interval training (HIIT) protocols of identical external work. Twelve moderately-trained males participated in the three HIIT trials which consisted of a warm-up, followed by 12 min of 15 s, 30 s or 60 s HIIT sequences with the work/rest ratio 1. The biochemical markers of inflammation, oxidative stress and muscle damage were analysed POST, 3 h and 24 h after the exercise...
February 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28458145/chlorite-reactivity-with-myoglobin-analogy-with-peroxide-and-nitrite-chemistry
#13
Cristina Bischin, Augustin Mot, Andrei Stefancu, Nicolae Leopold, Denisa Hathazi, Grigore Damian, Radu Silaghi-Dumitrescu
Stopped-flow UV-vis data allow for the first time direct spectroscopic detection of a ferryl species during the reaction of met myoglobin (Mb) with chlorite, analogous to what is observed in the reaction with peroxides. Ferryl is also observed in the reaction of oxy Mb+chlorite. A pathway involving Fe-O-O-ClO2 is explored by analogy with the Fe-O-O-NO and Fe-O-O-NO2 previously proposed as intermediates in the reactions of oxy globins with nitric oxide and nitrite, respectively. However, Fe-O-O-ClO2 is not detectable in these stopped-flow experiments and is in fact, unlike its nitrogenous congeners, predicted by density functional theory (DFT) to be impossible for a heme complex...
April 23, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28454727/proteomic-approach-to-characterize-biochemistry-of-meat-quality-defects
#14
REVIEW
M W Schilling, S P Suman, X Zhang, M N Nair, M A Desai, K Cai, M A Ciaramella, P J Allen
Proteomics can be used to characterize quality defects including pale, soft, and exudative (PSE) meat (pork and poultry), woody broiler breast meat, reddish catfish fillets, meat toughness, and beef myoglobin oxidation. PSE broiler meat was characterized by 15 proteins that differed in abundance in comparison to normal broiler breast meat, and eight proteins were differentially expressed in woody breast meat in comparison to normal breast meat. Hemoglobin was the only protein that was differentially expressed between red and normal catfish fillets...
April 21, 2017: Meat Science
https://www.readbyqxmd.com/read/28450187/nitrosoamphetamine-binding-to-myoglobin-and-hemoglobin-crystal-structure-of-the-h64a-myoglobin-nitrosoamphetamine-adduct
#15
Bing Wang, Samantha M Powell, Ye Guan, Nan Xu, Leonard M Thomas, George B Richter-Addo
N-hydroxyamphetamine (AmphNHOH) is an oxidative metabolite of amphetamine and methamphetamine. It is known to form inhibitory complexes upon binding to heme proteins. However, its interactions with myoglobin (Mb) and hemoglobin (Hb) have not been reported. We demonstrate that the reactions of AmphNHOH with ferric Mb and Hb generate the respective heme-nitrosoamphetamine derivatives characterized by UV-vis spectroscopy. We have determined the X-ray crystal structure of the H64A Mb-nitrosoamphetamine complex to 1...
April 24, 2017: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/28447186/comparison-of-the-recovery-response-from-high-intensity-and-high-volume-resistance-exercise-in-trained-men
#16
Sandro Bartolomei, Eliahu Sadres, David D Church, Eliott Arroyo, Joseph A Gordon Iii, Alyssa N Varanoske, Ran Wang, Kyle S Beyer, Leonardo P Oliveira, Jeffrey R Stout, Jay R Hoffman
PURPOSE: The purpose of this study was to compare the physiological responses of a high-volume (HV; 8 sets of 10 repetitions) versus high-intensity (HI; 8 sets of 3 repetitions) exercise protocol in resistance-trained men. METHODS: Twelve men (24.5 ± 4.2 years; 82.3 ± 8.4 kg; 175.2 ± 5.5 cm) with 6.3 ± 3.4 years of resistance training experience performed each protocol in a counterbalanced, randomized order. Performance [counter movement jump peak power (CMJP), isokinetic (ISOK) and isometric leg extension (MVIC), isometric mid-thigh pull (IMTP), and isometric squat (ISQ)] and muscle morphological [cross-sectional area (CSA) of vastus lateralis] assessments were performed at baseline (BL), 30-min (P-30 min), 24-h (P-24 h), 48-h (P-48 h), and 72-h (P-72 h) post-exercise for each testing session...
April 26, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28443661/engineering-of-rumb-toward-a-green-catalyst-for-carbene-insertion-reactions
#17
Matthew W Wolf, David A Vargas, Nicolai Lehnert
The small, stable heme protein myoglobin (Mb) was modified through cofactor substitution and mutagenesis to develop a new catalyst for carbene transfer reactions. The native heme was removed from wild-type Mb and several Mb His64 mutants (H64D, H64A, H64V), and the resulting apoproteins were reconstituted with ruthenium mesoporphyrin IX (RuMpIX). The reconstituted proteins (RuMb) were characterized by UV-vis and circular dichroism spectroscopy and were used as catalysts for the N-H insertion of aniline derivatives and the cyclopropanation of styrene derivatives...
April 26, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28439629/transitioning-to-the-direct-anterior-approach-in-total-hip-arthroplasty-is-it-a-true-muscle-sparing-approach-when-performed-by-a-low-volume-hip-replacement-surgeon
#18
Dan-Viorel Nistor, Sergiu Caterev, Sorana-Daniela Bolboacă, Dan Cosma, Dan Osvald Gheorghe Lucaciu, Adrian Todor
PURPOSE: We conducted this study to establish if the transition from a lateral approach (LA) to the direct anterior approach (DAA) for a low volume hip arthroplasty surgeon during the steep learning curve can be performed maintaining the muscle sparing approach of the DAA without increasing the complication rates. METHODS: In this controlled, prospective, randomized clinical study we investigated 70 patients (35 DAA, 35 LA) with similar demographics that underwent a total hip arthroplasty...
April 24, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28437706/three-phases-in-ph-dependent-heme-abstraction-from-myoglobin
#19
Sohini Mukherjee, Manjistha Mukherjee, Sabyasachi Bandyopadhyay, Abhishek Dey
The extent of heme extraction from myoglobin (Mb) by methylethyl ketone is found to be pH dependent and show three distinct phases. Parallel investigations of the protein using resonance Raman (rR) and circular dichroism (CD) across these pH regions indicate that these phases correspond to three different protonation steps in holoMb as the pH of the solution changed. The first transition occurs between pH5-6 and is due to the protonation of one of the heme propionate groups which disrupts its H-bonding with Arg 45 in the loop...
April 9, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28432454/cobalt-tetradehydrocorrins-coordinated-by-imidazolate-like-histidine-in-the-heme-pocket-of-horseradish-peroxidase
#20
Koji Oohora, Ning Tang, Yoshitsugu Morita, Takashi Hayashi
Horseradish peroxidase was reconstituted with cobalt tetradehydrocorrin, rHRP(Co(TDHC)), as a structural analog of cobalamin coordinated with an imidazolate-like His residue, which is generally seen in native enzymes. In contrast to the previously reported cobalt tetradehydrocorrin-reconstituted myoglobin, rMb(Co(TDHC)), the HRP matrix was expected to provide strong axial ligation by His170 which has imidazolate character. rHRP(Co(II)(TDHC)) was characterized by EPR and its reaction with reductants indicates a negative shift of its redox potential compared to rMb(Co(TDHC))...
April 21, 2017: Journal of Biological Inorganic Chemistry: JBIC
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