Read by QxMD icon Read


Shiraz A Maskatia, Rodrigo Ruano, Alireza A Shamshirsaz, Pouya Javadian, Joshua A Kailin, Michael A Belfort, Carolyn A Altman, Nancy A Ayres
INTRODUCTION: Twin-twin transfusion syndrome (TTTS) is the major cause for fetal demise in monochorionic diamniotic pregnancies. Estimated combined cardiac output (CCO) has not been studied in this setting. The primary aims of this study were to compare CCO in twin donor and recipient fetuses and assess differences in CCO before and after laser coagulation therapy. A secondary aim was to evaluate the relationship of CCO with perinatal mortality, defined as intrauterine or neonatal mortality (≤30 days of age) in fetuses that underwent laser coagulation therapy...
October 19, 2016: Echocardiography
Se-Jung Kwak, Young-Min Kim, Hee Jin Baek, Se Hong Kim, Hyeon Woo Yim
OBJECTIVE: Our aim was to compare the compression quality, exercise intensity, and energy expenditure in 5-minute single-rescuer cardiopulmonary resuscitation (CPR) using 15:1 or 30:2 compression-to-ventilation (C:V) ratios or chest compression only (CCO). METHODS: This was a randomized, crossover manikin study. Medical students were randomized to perform either type of CPR and do the others with intervals of at least 1 day. We measured compression quality, ratings of perceived exertion (RPE) score, heart rate, maximal oxygen uptake, and energy expenditure during CPR...
September 2016: Clin Exp Emerg Med
Claudia R Oliva, Tahireh Markert, Larry J Ross, E Lucile White, Lynn Rasmussen, Wei Zhang, Maaike Everts, Douglas R Moellering, Shannon M Bailey, Mark J Suto, Corinne E Griguer
The enzyme cytochrome c oxidase (CcO), or complex IV (EC, is a large transmembrane protein complex that serves as the last enzyme in the respiratory electron transport chain of eukaryotic mitochondria. CcO promotes the switch from glycolytic to oxidative phosphorylation (OXPHOS) metabolism and has been associated with increased self-renewal characteristics in gliomas. Increased CcO activity in tumors has been associated with tumor progression after chemotherapy failure, and patients with primary glioblastoma multiforme and high tumor CcO activity have worse clinical outcomes than those with low tumor CcO activity...
September 27, 2016: Journal of Biological Chemistry
Venkat Reddy Pannala, Amadou K S Camara, Ranjan K Dash
Cytochrome c oxidase (CcO) catalyzes the exothermic reduction of O2 to H2O by utilizing electrons from cytochrome c, and hence plays a crucial role in ATP production. Although details on the enzyme structure and redox centers involved in O2 reduction have been known, there still remains a considerable ambiguity on its mechanism of action, e.g. the number of sequential electrons donated to O2 in each catalytic step, the sites of protonation and proton pumping, and nitric oxide (NO) inhibition mechanism. In this work, we developed a thermodynamically-constrained mechanistic mathematical model for the catalytic action of CcO based on available kinetic data...
September 15, 2016: Journal of Applied Physiology
Chang-Liang Hou, Jing-Bo Wang, Hua Wu, Jia-Yu Liu, Zhi-Qing Ma, Jun-Tao Feng, Xing Zhang
Cytochrome c oxidase subunit II (COX II) containing a dual core CuA active site is one of the core subunits of mitochondrial Cytochrome c oxidase (Cco), which plays a significant role in the physiological process. In this report, the full-length cDNA of COXII gene was cloned from Sitophilus zeamais, which had an open reading frame (ORF) of 684 bp encoding 227 amino acids residues. The predicted COXII protein had a molecular mass of 26.2 kDa with pI value of 6.37. multiple sequence alignment and phylogenetic analysis indicated that Sitophilus zeamais COXII had high sequence identity with the COXII of other insect species...
September 30, 2016: Biochemical and Biophysical Research Communications
Naomine Yano, Kazumasa Muramoto, Atsuhiro Shimada, Shuhei Takemura, Junpei Baba, Hidenori Fujisawa, Masao Mochizuki, Kyoko Shinzawa-Itoh, Eiki Yamashita, Tomitake Tsukihara, Shinya Yoshikawa
Bovine heart cytochrome c oxidase (CcO) pumps 4 proton equivalents per catalytic cycle through the H-pathway, a proton-conducting pathway, which includes a hydrogen-bond network and a water channel operating in tandem. Protons are transferred by H3O(+) through the water channel from the N-side into the hydrogen-bond network where they are pumped to the P-side by electrostatic repulsion between protons and net positive charges created at heme a as a result of electron donation to O2 bound to heme a3 To block backward proton movement, the water channel remains closed after O2 binding until the sequential four-proton pumping process is complete...
September 7, 2016: Journal of Biological Chemistry
Ifeoma Muoto, Jeff Luck, Jangho Yoon, Stephanie Bernell, Jonathan M Snowden
Policies at the state and federal levels affect access to health services, including prenatal care. In 2012 the State of Oregon implemented a major reform of its Medicaid program. The new model, called a coordinated care organization (CCO), is designed to improve the coordination of care for Medicaid beneficiaries. This reform effort provides an ideal opportunity to evaluate the impact of broad financing and delivery reforms on prenatal care use. Using birth certificate data from Oregon and Washington State, we evaluated the effect of CCO implementation on the probability of early prenatal care initiation, prenatal care adequacy, and disparities in prenatal care use by type of insurance...
September 1, 2016: Health Affairs
Donald R Noll, Brian F Degenhardt, Jane C Johnson
CONTEXT: Osteopathic manipulative treatment (OMT) is a promising adjunctive treatment for older adults hospitalized for pneumonia. OBJECTIVE: To report subgroup analyses from the Multicenter Osteopathic Pneumonia Study in the Elderly (MOPSE) relating to hospital length of stay (LOS), ventilator-dependent respiratory failure rate, and in-hospital mortality rate. DESIGN: Multicenter randomized controlled trial. SETTING: Seven community hospitals...
September 1, 2016: Journal of the American Osteopathic Association
Helen Seliman
No abstract text is available yet for this article.
August 2016: Chinese Clinical Oncology
Longhua Yang, Åge A Skjevik, Wen-Ge Han Du, Louis Noodleman, Ross C Walker, Andreas W Götz
Cytochrome c oxidase (CcO) is a vital enzyme that catalyzes the reduction of molecular oxygen to water and pumps protons across mitochondrial and bacterial membranes. This article presents parameters for the cofactors of ba3-type CcO that are compatible with the all-atom Amber ff12SB and ff14SB force fields. Specifically, parameters were developed for the CuA pair, heme b, and the dinuclear center that consists of heme a3 and CuB bridged by a hydroperoxo group. The data includes geometries in XYZ coordinate format for cluster models that were employed to compute proton transfer energies and derive bond parameters and point charges for the force field using density functional theory...
September 2016: Data in Brief
Shreyas Supekar, Ana P Gamiz-Hernandez, Ville R I Kaila
Cytochrome c oxidase (CcO) is a redox-driven proton pump that powers aerobic respiratory chains. We show here by multi-scale molecular simulations that a protonated water cluster near the active site is likely to serve as the transient proton-loading site (PLS) that stores a proton during the pumping process. The pKa of this water cluster is sensitive to the redox states of the enzyme, showing distinct similarities to other energy converting proton pumps.
September 19, 2016: Angewandte Chemie
Marianna E Jung, Daniel B Metzger
Ethanol withdrawal (EW) is referred to the abrupt termination of long-term heavy drinking, and provokes oxidative brain damage. Here, we investigated whether the cerebellum and hippocampus of female rats are less affected by prooxidant EW than male rats due to the antioxidant effect of 17β-estradiol (E2). Female and male rats received a four-week ethanol diet and three-week withdrawal per cycle for two cycles. Some female rats were ovariectomized with E2 or antioxidant (Vitamin E+Co-Q10) treatment. Measurements were cerebellum (Rotarod) and hippocampus (water-maze)-related behaviors, oxidative markers (O2(-), malondialdehyde, protein carbonyls), mitochondrial membrane swelling, and a key mitochondrial enzyme, cytochrome c oxidase (CcO)...
November 1, 2016: Behavioural Brain Research
Xinlong Wang, Fenghua Tian, Sagar S Soni, F Gonzalez-Lima, Hanli Liu
Photobiomodulation, also known as low-level laser/light therapy (LLLT), refers to the use of red-to-near-infrared light to stimulate cellular functions for physiological or clinical benefits. The mechanism of LLLT is assumed to rely on photon absorption by cytochrome c oxidase (CCO), the terminal enzyme in the mitochondrial respiratory chain that catalyzes the reduction of oxygen for energy metabolism. In this study, we used broadband near-infrared spectroscopy (NIRS) to measure the LLLT-induced changes in CCO and hemoglobin concentrations in human forearms in vivo...
2016: Scientific Reports
W Timothy Garvey, Jeffrey I Mechanick, Elise M Brett, Alan J Garber, Daniel L Hurley, Ania M Jastreboff, Karl Nadolsky, Rachel Pessah-Pollack, Raymond Plodkowski
OBJECTIVE: Development of these guidelines is mandated by the American Association of Clinical Endocrinologists (AACE) Board of Directors and the American College of Endocrinology (ACE) Board of Trustees and adheres to published AACE protocols for the standardized production of clinical practice guidelines (CPGs). METHODS: Recommendations are based on diligent review of clinical evidence with transparent incorporation of subjective factors. RESULTS: There are 9 broad clinical questions with 123 recommendation numbers that include 160 specific statements (85 [53...
July 2016: Endocrine Practice
Y Yang, Y Zhou, S Cheng, J L Sun, H Yao, L Ma
Here, we investigated the effect of uric acid (UA) on hepatocyte mitochondria. Hepatocytes cultured in vitro were treated with varying concentrations of UA. The change in apoptotic activity was detected by flow cytometry. The DNA damage index 8-hydroxy-deoxy-guanosine (8-OHdG) and mitochondrial function indices succinate dehydrogenase (SDH), cytochrome C oxidase (CCO), and adenosine triphosphate (ATP) were detected by enzyme assays. Reactive oxygen species (ROS) accumulation was confirmed by a dichloro-dihydro-fluorescein diacetate assay...
2016: Genetics and Molecular Research: GMR
Josep Martí-Solans, Olga V Belyaeva, Nuria P Torres-Aguila, Natalia Y Kedishvili, Ricard Albalat, Cristian Cañestro
The bloom of genomics is revealing gene loss as a pervasive evolutionary force generating genetic diversity that shapes the evolution of species. Outside bacteria and yeast, however, the understanding of the process of gene loss remains elusive, especially in the evolution of animal species. Here, using the dismantling of the retinoic acid metabolic gene network (RA-MGN) in the chordate Oikopleura dioica as a case study, we combine approaches of comparative genomics, phylogenetics, biochemistry, and developmental biology to investigate the mutational robustness associated to biased patterns of gene loss...
September 2016: Molecular Biology and Evolution
Masahiro Fujimoto, Masato Chijiwa, Tatsuya Nishiyama, Hideaki Takano, Kenji Ueda
To study the link between energy metabolism and secondary metabolism/morphological development in Streptomyces, knockout mutants were generated with regard to the subunits of the cytochrome oxidase supercomplex (CcO) in Streptomyces coelicolor A3(2). All mutants exhibited an identical phenotype: viable but defective in antibiotic production and cell differentiation when grown in both complex and minimal media. The growth yield of the CcO mutant was about half of that of the WT strain on glucose medium while both strains grew similarly on maltose medium...
August 2016: Microbiology
C Mutawila, C Stander, F Halleen, M A Vivier, L Mostert
Cell suspension cultures of Vitis vinifera cv. Dauphine berries were used to study the response to the vascular pathogen, Eutypa lata, in comparison with a biological control agent, Trichoderma atroviride, that was previously shown to be effective in pruning wound protection. The expression of genes coding for enzymes of the phenylpropanoid pathway and pathogenesis-related (PR) proteins was profiled over a 48-h period using quantitative reverse transcriptase PCR. The cell cultures responded to elicitors of both fungi with a hypersensitive-like response that lead to a decrease in cell viability...
June 28, 2016: Protoplasma
Julie Grasset, Élodie Ollivier, Bérénice Bougas, Glenn Yannic, Peter G C Campbell, Louis Bernatchez, Patrice Couture
In this study, we measured the effects of temperature (9°C, 20°C, and 28°C), metal contamination (cadmium and nickel) and their interaction on yellow perch (Perca flavescens) using liver enzymatic and transcriptomic endpoints and biometric indices. Kidney metal concentrations increased with a rise of temperature. The biometric indices analysed (Fulton condition factor, pyloric cæca, hepatosomatic and gonadosomatic indices) generally decreased with an increase of temperature but not with metal contamination...
August 2016: Aquatic Toxicology
Anju Yadav, Asheesh Gupta, Gaurav K Keshri, Saurabh Verma, Sanjeev K Sharma, Shashi Bala Singh
Burn wounds exhibit impaired healing as the progression through the normal sequential stages of tissue repair gets hampered by epidermal barrier disruption, compromised blood circulation, abrogated defence mechanism, pathologic inflammation, and septicemia. Our earlier results reported that superpulsed 904nm LLLT enhanced healing and attenuated inflammatory response in burn wounds. The present study investigated the effect of superpulsed 904nm LLLT (200ns pulse width; 100Hz; 0.7mW mean output power; 0.4mW/cm(2) average irradiance) on biochemical and molecular markers pertaining to bioenergetics and redox homeostasis on full-thickness burn wounds in experimental rats...
September 2016: Journal of Photochemistry and Photobiology. B, Biology
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"