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Hydroxybutyrate

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https://www.readbyqxmd.com/read/28430010/prolonged-injectable-formulation-of-nafarelin-using-in-situ-gel-combination-delivery-system
#1
Behnoush Alizadeh, Nika Bahari Javan, Hamid Akbari Javar, Mohammad Reza Khoshayand, Farid Abedin Dorkoosh
The principal purpose of the present study was to prepare and characterize a complex drug delivery system consisting of Nafarelin- poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) nanoparticles (NPs) in combination with sodium alginate/poloxamer 407 in situ gel. Nafarelin loaded PHBV NPs were prepared via double emulsion solvent evaporation technique. Box-Behnken Response Surface Methodology was utilized to optimize NPs. Mean particle size, polydispersity index (PDI), entrapment efficiency (EE) and drug loading (DL) of the optimized NPs were measured...
April 21, 2017: Pharmaceutical Development and Technology
https://www.readbyqxmd.com/read/28429505/total-synthesis-of-albocycline
#2
Vijay K Chatare, Rodrigo B Andrade
The macrolactone natural product (-)-albocycline is a promising antibiotic candidate for the treatment of both methicillin resistant Staphylococcus aureus (MRSA) and vancomycin-resistant strains. Herein we report a concise total synthesis of (-)-albocycline in 14 steps from commercially available methyl (R)-3-hydroxybutyrate. Novel key steps include the highly regio- and stereoselective reactions of chiral N-sulfinyl metallodienamines (NSMDs) with aldehydes and the Davis oxaziridine, in addition to the Horner-Wadsworth-Emmons olefination of N-sulfinyl imines...
April 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28429067/neuronal-oscillations-and-synchronicity-associated-with-gamma-hydroxybutyrate-during-resting-state-in-healthy-male-volunteers
#3
Robin von Rotz, Michael Kometer, Dario Dornbierer, Jürg Gertsch, M Salomé Gachet, Franz X Vollenweider, Erich Seifritz, Oliver G Bosch, Boris B Quednow
RATIONALE: Gamma-hydroxybutyrate (GHB) is a putative neurotransmitter, a drug of abuse, an anesthetic agent, and a treatment for neuropsychiatric disorders. In previous electroencephalography (EEG) studies, GHB was shown to induce an electrophysiological pattern of "paradoxical EEG-behavioral dissociation" characterized by increased delta and theta oscillations usually associated with sleep during awake states. However, no detailed source localization of these alterations and no connectivity analyses have been performed yet...
April 20, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28425205/engineering-the-xylose-catabolizing-dahms-pathway-for-production-of-poly-d-lactate-co-glycolate-and-poly-d-lactate-co-glycolate-co-d-2-hydroxybutyrate-in-escherichia-coli
#4
So Young Choi, Won Jun Kim, Seung Jung Yu, Si Jae Park, Sung Gap Im, Sang Yup Lee
Poly(lactate-co-glycolate), PLGA, is a representative synthetic biopolymer widely used in medical applications. Recently, we reported one-step direct fermentative production of PLGA and its copolymers by metabolically engineered Escherichia coli from xylose and glucose. In this study, we report development of metabolically engineered E. coli strains for the production of PLGA and poly(d-lactate-co-glycolate-co-d-2-hydroxybutyrate) having various monomer compositions from xylose as a sole carbon source. To achieve this, the metabolic flux towards Dahms pathway was modulated using five different synthetic promoters for the expression of Caulobacter crescentus XylBC...
April 19, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28425102/fatal-overdose-of-gamma-hydroxybutyrate-acid-after-ingestion-of-1-4-butanediol
#5
Erwan Le Garff, Vadim Mesli, Raphael Cornez, Christophe Demarly, Gilles Tournel, Valery Hédouin
We report a case of fatal intoxication from 1,4-butanediol (1,4-BD), which was ingested by a young and "naïve" gamma-hydroxybutyrate (GHB) consumer during a party with the co-ingestion of alcohol, cannabis, and methylene-dioxy-methamphetamine. The following drug concentrations were found using gas chromatography coupled with mass spectrometry on autopsy samples and on a cup and a glass found at the scene: 20,350 mg/L (bottle) for 1,4-BD; 1020 mg/L (femoral blood), 3380 mg/L (cardiac blood), 47,280 mg/L (gastric content), and 570 mg/L (vitreous humor) for GHB...
April 20, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28424564/new-developments-in-the-management-of-narcolepsy
#6
REVIEW
Vivien C Abad, Christian Guilleminault
Narcolepsy is a life-long, underrecognized sleep disorder that affects 0.02%-0.18% of the US and Western European populations. Genetic predisposition is suspected because of narcolepsy's strong association with HLA DQB1*06-02, and genome-wide association studies have identified polymorphisms in T-cell receptor loci. Narcolepsy pathophysiology is linked to loss of signaling by hypocretin-producing neurons; an autoimmune etiology possibly triggered by some environmental agent may precipitate hypocretin neuronal loss...
2017: Nature and Science of Sleep
https://www.readbyqxmd.com/read/28422130/assessment-of-metabolic-phenotypic-variability-in-children-s-urine-using-1-h-nmr-spectroscopy
#7
Léa Maitre, Chung-Ho E Lau, Esther Vizcaino, Oliver Robinson, Maribel Casas, Alexandros P Siskos, Elizabeth J Want, Toby Athersuch, Remy Slama, Martine Vrijheid, Hector C Keun, Muireann Coen
The application of metabolic phenotyping in clinical and epidemiological studies is limited by a poor understanding of inter-individual, intra-individual and temporal variability in metabolic phenotypes. Using (1)H NMR spectroscopy we characterised short-term variability in urinary metabolites measured from 20 children aged 8-9 years old. Daily spot morning, night-time and pooled (50:50 morning and night-time) urine samples across six days (18 samples per child) were analysed, and 44 metabolites quantified...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28421806/diet-and-liver-apoptosis-in-rats-a-particular-metabolic-pathway
#8
Maria Emilia Lopes Monteiro, Analucia Rampazzo Xavier, Vilma Blondet Azeredo
INTRODUCTION: Various studies have indicated an association between modifi cation in dietary macronutrient composition and liver apoptosis. OBJECTIVE: To explain how changes in metabolic pathways associated with a high-protein, high-fat, and low-carbohydrate diet causes liver apoptosis. METHODS: Two groups of rats were compared. An experimental diet group (n = 8) using a high-protein (59.46%), high-fat (31.77%), and low-carbohydrate (8.77%) diet versus a control one (n = 9) with American Institute of Nutrition (AIN)-93-M diet...
March 30, 2017: Nutrición Hospitalaria: Organo Oficial de la Sociedad Española de Nutrición Parenteral y Enteral
https://www.readbyqxmd.com/read/28419829/characterization-of-polyhydroxyalkanoates-produced-by-synechocystis-salina-from-digestate-supernatant
#9
Adriana Kovalcik, Katharina Meixner, Matthias Mihalic, Wolfgang Zeilinger, Ines Fritz, Werner Fuchs, Pavel Kucharczyk, Franz Stelzer, Bernhard Drosg
The current commercial production of polyhydroxyalkanoates (PHA) is based on heterotrophic bacteria, using organic carbon sources from crops. To avoid the competition with food and feed production, cyanobacteria, metabolising PHA from carbon dioxide can be used. This research focuses on the investigation of the thermal and rheological properties of PHA polymers accumulated by Synechocystis salina, which had been cultivated in digestate supernatant and a mineral medium. The dried bacterial cells had a polymer content of 5...
April 15, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28417527/effects-of-dapagliflozin-on-insulin-requirement-glucose-excretion-and-%C3%A3-hydroxybutyrate-levels-are-not-related-to-baseline-hba1c-in-youth-with-type-1-diabetes
#10
Torben Biester, Baerbel Aschemeier, Maryam Fath, Marcel Frey, Markus F Scheerer, Olga Kordonouri, Thomas Danne
Youth with type 1 diabetes (T1D) infrequently achieve HbA1c targets. Therefore, this placebo-controlled, randomized, crossover study was set up to assess the safety, effect and pharmacokinetics of a single dose of 10 mg dapagliflozin (DAPA) as add-on to insulin in relationship to HbA1c in youth. 33 youths (14 males, median age 16 years, diabetes duration 8 years) were included and stratified into three baseline HbA1c categories (<7.5%, 7.5 to 9.0% or >9.0; n = 11 each). During the study period of 24 hours, intravenous insulin administration and glucose-infusion kept blood glucose levels between 160-220 mg/dl...
April 17, 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28412387/germ-cells-regulate-3-hydroxybutyrate-production-in-rat-sertoli-cells
#11
Regueira Mariana, Rindone Gustavo Marcelo, Galardo María Noel, Pellizzari Eliana Herminia, Cigorraga Selva Beatriz, Meroni Silvina Beatriz, Riera María Fernanda
Paracrine regulation of Sertoli cell function by germ cells is an outstanding characteristic of testicular physiology. It has been demonstrated that Sertoli cells produce ketone bodies and that germ cells may use them as energy source. The aim of the study was to analyze a possible regulation by germ cells of ketogenesis in Sertoli cells. Cultures of Sertoli cells (SC) obtained from 31-day-old rats were co-cultured with germ cells (GC). The results presented herein show that the presence of GC stimulated 3-hydroxybutyrate production and increased mRNA levels of two enzymes involved in ketogenesis -carnitine palmitoyltransferase 1a (CPT1a) and mitochondrial 3-hydroxy-3-methylglutaryl-CoA (mHMGCoA) synthase- in SC...
April 12, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28407826/-a-retrospective-analysis-of-6-children-with-duchenne-muscular-dystrophy
#12
Yu-Jie Yin, Yu-Ping Huang, Chao Lu, Xue-Ping Sun, Feng-Nan Niu, Rui Jin, Guo-Ping Zhou
OBJECTIVE: To analyze the clinical features of 6 children with Duchenne muscular dystrophy (DMD) and review related literature, and to provide a basis for early diagnosis and effective treatment of this disease. METHODS: A retrospective analysis was performed on the clinical data of 6 children with DMD who were admitted to the First Affiliated Hospital of Nanjing Medical University from January 2010 to October 2015. RESULTS: All the 6 cases were boys without a family history of DMD, and the age of diagnosis of DMD was 1...
April 2017: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/28402690/reduction-of-abdominal-adhesions-with-elecrospun-fiber-membranes-in-rat-models
#13
Junsheng Li, Guanghui Ren, Weiyu Zhang
PURPOSE: The aim of this study was to assess the effects three electrospun fiber membranes on postoperative adhesion formation in rat surgical models. MATERIALS AND METHODS: The PEG-PHBV (polyethylene glycol and poly-β-hydroxybutyrate valerate), PLA(Polylactic acid) and CS-PEG(chitosan and polyethylene glycol) were used for submicrometric membranes fabrication by electrospinning. A total of 64 SD male rats were randomly divided into 4 groups, one control group and 3 treatment groups, each consisting of 16 rats...
April 12, 2017: Journal of Investigative Surgery: the Official Journal of the Academy of Surgical Research
https://www.readbyqxmd.com/read/28398950/a-ketone-ester-drink-increases-postexercise-muscle-glycogen-synthesis-in-humans
#14
David A Holdsworth, Peter J Cox, Tom Kirk, Huw Stradling, Samuel G Impey, Kieran Clarke
INTRODUCTION: Physical endurance can be limited by muscle glycogen stores, in that glycogen depletion markedly reduces external work. During carbohydrate restriction, the liver synthesises the ketone bodies, D-β-hydroxybutyrate and acetoacetate, from fatty acids. In animals and in the presence of glucose, D-β-hydroxybutyrate promotes insulin secretion and increases glycogen synthesis. Here we determined whether a dietary ketone ester, combined with plentiful glucose, can increase post-exercise glycogen synthesis in human skeletal muscle...
April 10, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28397627/influence-of-fumaric-acid-on-ruminal-parameters-and-organ-weights-of-growing-bulls-fed-with-grass-or-maize-silage
#15
N Remling, S Riede, U Meyer, A Beineke, G Breves, G Flachowsky, S Dänicke
The influence of the potential methane reducer, fumaric acid (FA), on ruminal parameters, the rumen wall and organ weights was investigated in a long-term study with growing bulls. In all, 20 bulls were fed with maize or grass silage as roughage, and with concentrate with or without 300 g FA per animal and day during the whole fattening period. After slaughtering, the organs were weighed and blood serum was analysed for glucose, β-hydroxybutyric acid (BHB) and non-esterified fatty acid concentration. The ruminal fluid was analysed for short-chain fatty acids, ammonia-N and the microbial community via single strand conformation polymorphism analysis...
April 11, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28397621/performance-of-holstein-calves-receiving-equal-quantities-of-milk-at-fixed-or-variable-amounts-per-day-during-milk-feeding-period
#16
M Khani, F Ahmadi, M Ariana, S Omidian, S Sharifi, M H Ghaffari, H Beiranvand
Two experiments were conducted to determine the effects of feeding equal quantities of milk during the pre-weaning period through different milk-feeding regimes on calf growth, starter intake and selected blood metabolites. In experiment 1, 44 female Holstein calves (3 days of age and 39.2±4.3 kg of BW) were distributed randomly to one of two milk-feeding programs (1 calf per pen; 22 pens per treatment group): (1) consistent (CONS; 6 l/day of milk from days 3 to 60 and 3 l/day from days 61 to 65 of age) or (2) step-up/step-down (SUSD; 5 l/day of milk from days 3 to 15, 8 l/day from days 16 to 40, 6 l/day from days 41 to 50, 3 l/day from days 51 to 60 and then 2 l/day from days 61 to 65 of age)...
April 11, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28397070/ketone-bodies-as-anti-seizure-agents
#17
Timothy A Simeone, Kristina A Simeone, Jong M Rho
There is growing evidence that ketone bodies (KB)-derived from fatty acid oxidation and produced during fasting or consumption of high-fat diets-can exert broad neuroprotective effects. With respect to epilepsy, KB (such as β-hydroxybutyrate or BHB, acetoacetate and acetone) have been shown to block acutely induced and spontaneous recurrent seizures in various animal models. Although the mechanisms underlying the anti-seizure effects of KB have not been fully elucidated, recent experimental studies have invoked ketone-mediated effects on both inhibitory (e...
April 10, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28395176/the-ketogenic-diet-metabolite-beta-hydroxybutyrate-%C3%AE-hb-reduces-incidence-of-seizure-like-activity-sla-in-a-katp-and-gabab-dependent-manner-in-a-whole-animal-drosophila-melanogaster-model
#18
Jinglu Li, Emma I O'Leary, Geoffrey R Tanner
The high-fat, low-carbohydrate ketogenic diet (KD) is an effective clinical treatment for epilepsy in juveniles, especially for drug-resistant seizures. The KD results in elevated production of ketone bodies (KB's), such as beta-hydroxybutyrate (β-HB), which are thought to have anticonvulsant properties; however, their exact mechanism of action is unknown. In vitro, KB effects on reducing neuronal firing rates are mediated in part by Katp channel activity and GABAb signaling. In order to study metabolic and pharmacological effects in a whole-animal model, we used the eas "bang-sensitive" (BS) mutant strain of Drosophila, which exhibits seizure-like activity (SLA) upon mechanical stimulation...
April 5, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28394518/-the-study-of-effectiveness-of-polyhydroxyalkanoates-based-biodegradable-stents-in-ureteropelvic-segment-pyeloplasty
#19
M P Myltygashev, A N Boyandin, A A Shumilova, F P Kapsargin, E I Shishatskaya, A K Kirichenko, T G Volova
INTRODUCTION: Among urologic diseases, ureteropelvic segment stenosis with hydronephrosis is a common indication for instrumental or surgical correction. The restriction of urine flow with dilatation proximal to obstruction develops in 6.5-37% of cases at different times after the ureteral reconstruction. All this urges to develop and improve stents and search for effective ways to place stents and control their function. AIM: To investigate the effectiveness of polyhydroxyalkanoates based biodegradable stent compared with a commercial analogue in upper urinary tract drainage after ureteropelvic segment pyeloplasty...
April 2017: Urologii︠a︡
https://www.readbyqxmd.com/read/28393487/poly-3-hydroxybutyrate-co-3-hydroxyvalerate-production-from-biodiesel-by-product-and-propionic-acid-by-mutant-strains-of-pandoraea-sp
#20
Fabrício C de Paula, Jonas Contiero, Carolina B C de Paula, José Gregório C Gomez, Alexander Steinbüchel
Pandoraea sp. MA03 wild type strain was subjected to UV mutation in order to obtain mutants unable to grow on propionic acid (PA) but still able to produce poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [P(3HB-co-3HV)] from glycerol and PA at high 3HV yields. In shake flask experiments, mutant prp25 was selected from 52 mutants affected in the propionate metabolism exhibiting a conversion rate of PA into 3HV units of 0.78 gg(-1) . The utilization of crude glycerol (CG) plus PA or valeric acid resulted in a copolymer with 3HV contents varying from 21...
April 10, 2017: Biotechnology Progress
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