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https://www.readbyqxmd.com/read/28533430/heme-thiolate-sulfenylation-of-human-cytochrome-p450-4a11-functions-as-a-redox-switch-for-catalytic-inhibition
#1
Matthew E Albertolle, Donghak Kim, Leslie D Nagy, Chul-Ho Yun, Ambra Pozzi, Uzen Savas, Eric F Johnson, F Peter Guengerich
Cytochrome P450 (P450, CYP) 4A11 is a human fatty acid ω-hydroxylase that catalyzes the oxidation of arachidonic acid to the eicosanoid 20- hydroxyeicosatetraenoic acid (20-HETE), which plays important roles in regulating blood pressure regulation. Variants of P450 4A11 have been associated with high blood pressure and resistance to anti-hypertensive drugs, and 20-HETE has both pro- and antihypertensive properties relating to increased vasoconstriction and natriuresis, respectively. These physiological activities are likely influenced by the redox environment, but the mechanisms are unclear...
May 22, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28532831/cryosurvival-of-in%C3%A2-vitro-produced-bovine-embryos-supplemented-with-l-carnitine-and-concurrent-reduction-of-fatty-acids
#2
E Held-Hoelker, S L Klein, F Rings, D Salilew-Wondim, M Saeed-Zidane, C Neuhoff, D Tesfaye, K Schellander, M Hoelker
Lipid accumulation is associated with reduced embryonic quality, causing limited survival after cryopreservation. Therefore, in the present study we aimed to reveal the effects of supplementation of a lipid reducing agent, l-carnitine and the removal of fatty acids during in vitro culture on the morphological as well as on the molecular level. To accomplish that, presumptive zygotes were cultured in 4 contrasting groups: namely SOFaa medium supplemented with BSA, (BSA), SOFaa medium supplemented with fatty acid free BSA (FAF), SOFaa medium supplemented with BSA as well as l-Carnitine (BSA + LC) and SOFaa medium concurrently supplemented with fatty acid free BSA and l-Carnitine (FAF + LC)...
July 1, 2017: Theriogenology
https://www.readbyqxmd.com/read/28528383/pretreatment-of-hardwood-and-miscanthus-with-trametes-versicolor-for-bioenergy-conversion-and-densification-strategies
#3
Ryan M Kalinoski, Hector D Flores, Sunil Thapa, Erin R Tuegel, Michael A Bilek, Evelin Y Reyes-Mendez, Michael J West, Tim J Dumonceaux, Thomas Canam
The pretreatment of plant biomass negatively impacts the economics of many bioenergy and bioproduct processes due to the thermochemical requirements for deconstruction of lignocelluluose. An effective strategy to reduce these severity requirements is to pretreat the biomass with white-rot fungi, such as Trametes versicolor, which have the innate ability to deconstruct lignocellulose with a suite of specialized enzymes. In the present study, the effects of 12 weeks of pretreatment with a wild-type strain (52J) and a cellobiose dehydrogenase-deficient strain (m4D) of T...
May 20, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28528081/click-strategy-using-disodium-salts-of-amino-acids-improves-the-water-solubility-of-plinabulin-and-kpu-300
#4
Fumika Yakushiji, Kyohei Muguruma, Yoshiki Hayashi, Takuya Shirasaka, Ryosuke Kawamata, Hironari Tanaka, Yushi Yoshiwaka, Akihiro Taguchi, Kentaro Takayama, Yoshio Hayashi
Plinabulin and KPU-300 are promising anti-microtubule agents; however, the low water solubility of these compounds (<0.1µg/mL) has limited their pharmaceutical advantages. Here, we developed five water-soluble derivatives of plinabulin and KPU-300 with a click strategy using disodium salts of amino acids. The mother skeleton, diketopiperazine (DKP), was transformed into a monolactim-type alkyne and a copper-catalyzed alkyne azide cycloaddition (CuAAC) combined azides that was derived from amino acids as a water-solubilizing moiety...
May 4, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28527058/headache-and-arterial-hypertension
#5
Cinzia Finocchi, Davide Sassos
Elevated blood pressure (BP) and headache have long been linked in the medical literature. Headache associated with arterial hypertension is a main concern in emergency department. It is believed that headache may be a symptom attributed to arterial hypertension only if the BP values are very high or rise quickly. Many studies support the hypothesis that migraine patients have an increased risk of developing hypertension, while hypertensive subjects do not seem to have an increased risk of migraine or other types of headache...
May 2017: Neurological Sciences
https://www.readbyqxmd.com/read/28525715/ultra-small-magnetic-cufese2-ternary-nanocrystals-for-multimodal-imaging-guided-photothermal-therapy-of-cancer
#6
Xinxin Jiang, Shaohua Zhang, Feng Ren, Lei Chen, Jianfeng Zeng, Mo Zhu, Zhenxiang Cheng, Mingyuan Gao, Zhen Li
Nanoscale ternary chalcogenides have attracted intense research interest due to their wealth of tunable properties and diverse applications in energy, environmental and biomedical fields. In this article, ultra-small magnetic CuFeSe2 ternary nanocrystals (< 5.0 nm) were fabricated in the presence of thiol functionalized poly(methacrylic acid) (PTMP-PMAA) by an environmentally friendly aqueous method under ambient conditions. The small band gap and the existence of intermediate bands lead to a broad NIR absorbance in the range of 500 - 1100 nm, and high photothermal conversion efficiency (82%) of CuFeSe2 nanocrystals...
May 19, 2017: ACS Nano
https://www.readbyqxmd.com/read/28523918/current-status-of-viral-diseases-in-indian-shrimp-aquaculture
#7
G M Tandel, K Riji John, M Rosalind George, M J Prince Jeyaseelan
The intensification of aquaculture has been unique in showing the overwhelming changes in global food production in the last 100 years. Presently, it is playing a vital role in the economies of several countries. Conversely, it is also to be noted that the progression of aquaculture has been the foundation of anthropogenic alteration of a gigantic hierarchy and hence not astonishingly, it resulted in spread and emergence of an increasing group of new unknown diseases. In India, Penaeus monodon, black tiger shrimp was previously the foremost-cultivated shrimp species...
2017: Acta Virologica
https://www.readbyqxmd.com/read/28523248/the-keap1-nrf2-system-in-cancer
#8
REVIEW
Keiko Taguchi, Masayuki Yamamoto
Cancer cells first adapt to the microenvironment and then propagate. Mutations in tumor suppressor genes or oncogenes are frequently found in cancer cells. Comprehensive genomic analyses have identified somatic mutations and other alterations in the KEAP1 or NRF2 genes and in well-known tumor suppressor genes or oncogenes, such as TP53, CDKN2A, PTEN, and PIK3CA, in various types of cancer. Aberrant NRF2 activation in cancer cells occurs through somatic mutations in the KEAP1 or NRF2 gene as well as through other mechanisms that disrupt the binding of KEAP1 to NRF2...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28522813/in-situ-assembly-of-ag-nanoparticles-agnps-on-porous-silkworm-cocoon-based-would-film-enhanced-antimicrobial-and-wound-healing-activity
#9
Kun Yu, Fei Lu, Qing Li, Honglei Chen, Bitao Lu, Jiawei Liu, Zhiquan Li, Fangying Dai, Dayang Wu, Guangqian Lan
Preventing wound infection and retaining an appropriate level of moisture around wounds represent the most critical issues in wound treatment. Towards these ends, special focus has been placed on Bombyx mori cocoons because the protective function of the silkworm cocoon resembles the manner in which the skin protects the human body. We have designed a facile technique to develop a novel silkworm cocoon-based wound film (SCWF) wound dressing utilizing a CaCl2-ethanol-H2O solution. To improve the anti-bacterial performance of SCWF, we have incorporated the ability of silk sericin to act as a reducing agent for the conversion of Ag(+) to Ag, yielding nanoparticles (AgNPs) linked together by peptide bonds of silkworm cocoon wound film (SCWF-AgNPs)...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28521682/repurposing-of-copper-ii-chelating-drugs-for-the-treatment-of-neurodegenerative-diseases
#10
Valeria Lanza, Danilo Milardi, Giuseppe Di Natale, Giuseppe Pappalardo
BACKGROUND: There is mounting urgency to find new drugs for the treatment of neurodegenerative disorders. A large number of reviews has exhaustively described either the molecular or clinical aspects of neurodegenerative diseases as Alzheimer's (AD) and Parkinson's (PD). Conversely, reports outlining how known drugs in use for other diseases can be also effective as therapeutic agents in neurodegenerative diseases are less reported. This review focuses on the current uses of some copper(II) interacting molecules as potential drug candidates in neurodegeneration...
May 17, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28518145/cytoplasmic-rap1-mediates-cisplatin-resistance-of-non-small-cell-lung-cancer
#11
Lu Xiao, Xiaoying Lan, Xianping Shi, Kai Zhao, Dongrui Wang, Xuejun Wang, Faqian Li, Hongbiao Huang, Jinbao Liu
Cytotoxic chemotherapy agents (e.g., cisplatin) are the first-line drugs to treat non-small cell lung cancer (NSCLC) but NSCLC develops resistance to the agent, limiting therapeutic efficacy. Despite many approaches to identifying the underlying mechanism for cisplatin resistance, there remains a lack of effective targets in the population that resist cisplatin treatment. In this study, we sought to investigate the role of cytoplasmic RAP1, a previously identified positive regulator of NF-κB signaling, in the development of cisplatin resistance in NSCLC cells...
May 18, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28516783/antidiabetic-disruptors-of-the-glucokinase-glucokinase-regulatory-protein-complex-reorganize-a-coulombic-interface
#12
Juliana Martinez, Qing Xiao, Armen Zakarian, Brian G Miller
The glucokinase regulatory protein (GKRP) plays an essential role in glucose homeostasis by acting as a competitive inhibitor of glucokinase (GCK) and triggering its localization to the hepatocyte nucleus upon glucose deprivation. Metabolites such as fructose 6-phosphate and sorbitol 6-phosphate promote assembly of the GCK-GKRP complex, whereas fructose 1-phosphate and functionalized piperazines with potent in vivo antidiabetic activity disrupt the complex. Here, we establish the molecular basis by which these natural and synthetic ligands modulate the GCK-GKRP interaction...
May 18, 2017: Biochemistry
https://www.readbyqxmd.com/read/28513783/influence-of-addition-of-2-methacryloyloxy-ethyl-trimethylammonium-chloride-to-an-experimental-adhesive
#13
Fabrício Mezzomo Collares, Vicente Castelo Branco Leitune, Patrícia Franken, Clarissa Fatturi Parollo, Fabrício Aulo Ogliari, Susana Maria Werner Samuel
The aim of this study was to develop an experimental adhesive with addition of [2-(methacryloyloxy)ethyl]trimethylammonium chloride (METAC) and to evaluate its mechanical and biological properties and its in vitro antibacterial activity. An experimental adhesive resin was formulated with Bis-GMA, TEGDMA, and HEMA. The antibacterial monomer was added at concentrations of 1%, 2.5%, and 5% (METAC groups). A group without METAC addition was used as control. The experimental adhesives were evaluated as to their antibacterial potential against Streptococcus mutans, degree of conversion, and softening in ethanol for 2 hours...
May 4, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28513534/unraveling-prion-protein-interactions-with-aptamers-and-other-prp-binding-nucleic-acids
#14
REVIEW
Bruno Macedo, Yraima Cordeiro
Transmissible spongiform encephalopathies (TSEs) are a group of neurodegenerative disorders that affect humans and other mammals. The etiologic agents common to these diseases are misfolded conformations of the prion protein (PrP). The molecular mechanisms that trigger the structural conversion of the normal cellular PrP (PrP(C)) into the pathogenic conformer (PrP(Sc)) are still poorly understood. It is proposed that a molecular cofactor would act as a catalyst, lowering the activation energy of the conversion process, therefore favoring the transition of PrP(C) to PrP(Sc)...
May 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28511143/dna-assisted-upconversion-nanoplatform-for-imaging-guided-synergistic-therapy-and-laser-switchable-drug-detoxification
#15
Luoyuan Li, Panlong Hao, Peng Wei, Limin Fu, Xicheng Ai, Jianping Zhang, Jing Zhou
The side effects of chemotherapy bring significant physical and psychological suffering to patients. To solve this urgent medical problem, Yb(3+) and Er(3+) co-doped NaLuF4 upconversion nanoparticles (UCNPs) were constructed for upconversion luminescence (UCL)-labeled diagnosis under 980 nm laser irradiation. The UCNPs were then modified layer by layer with polypyrrole and a special programming DNA segment as photothermal conversion agents and controllable drug carriers, respectively. The nanoplatform was successfully used for imaging-guided synergistic therapy (photothermal therapy and chemotherapy) at a safe power density (300 mW cm(-2)), and DNA-assisted detoxification at lower temperature in cancer cells when the laser off...
May 5, 2017: Biomaterials
https://www.readbyqxmd.com/read/28508635/polydopamine-coated-manganese-carbonate-nanoparticles-for-amplified-magnetic-resonance-imaging-guided-photothermal-therapy
#16
Youxing Cheng, Shupeng Zhang, Ning Kang, Jianpan Huang, Xiaolin Lv, Kai Wen, Shefang Ye, Zhiwei Chen, Xi Zhou, Lei Ren
This study reports a multifunctional nanoparticle (NP) that can be used for amplified magnetic resonance image (MRI)-guided photothermal therapy (PTT) due to its surface coating with a polydopamine (PDA) shell. Importantly, by means of introducing the surface coating of PDA, large quantities of water can be trapped around the NPs allowing more efficient water exchange, leading to greatly improved MR contrast signals compared with those from NPs without the PDA coating. Further, a distinct photothermal effect can be obtained arising from the strong absorption of PDA in the near-infrared (NIR) region...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28507917/systemic-meta-analysis-assessing-the-short-term-applicability-of-early-conversion-to-mammalian-target-of-rapamycin-inhibitors-in-kidney-transplant
#17
Jayant Kumar, Isabella Reccia, Tomokazu Kusano, Bridson M Julie, Ajay Sharma, Ahmed Halawa
AIM: To consolidate the present evidence of effectiveness in renal functioning and graft survival following early introduction of mammalian target of rapamycin (mTOR) inhibitors with or without calcineurin inhibitors (CNIs) in renal transplant recipients. METHODS: We analysed the current literature following PROSPERO approval describing the role of immunosuppressive agent, mTOR inhibitors as an alternative to CNI within six months of renal transplant by searching the PubMed, EMBASE, Cochrane, Crossref, and Scopus using MeSH terms...
April 24, 2017: World Journal of Transplantation
https://www.readbyqxmd.com/read/28503196/synthesis-and-analysis-of-separation-networks-for-the-recovery-of-intracellular-chemicals-generated-from-microbial-based-conversions
#18
Kirti M Yenkie, Wenzhao Wu, Christos T Maravelias
BACKGROUND: Bioseparations can contribute to more than 70% in the total production cost of a bio-based chemical, and if the desired chemical is localized intracellularly, there can be additional challenges associated with its recovery. Based on the properties of the desired chemical and other components in the stream, there can be multiple feasible options for product recovery. These options are composed of several alternative technologies, performing similar tasks. The suitability of a technology for a particular chemical depends on (1) its performance parameters, such as separation efficiency; (2) cost or amount of added separating agent; (3) properties of the bioreactor effluent (e...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28500948/using-reduced-graphene-oxide-ca-cdse-nanocomposite-to-enhance-photoelectrochemical-activity-of-gold-nanoparticles-functionalized-tungsten-oxide-for-highly-sensitive-prostate-specific-antigen-detection
#19
Xueping Wang, Rui Xu, Xu Sun, Yaoguang Wang, Xiang Ren, Bin Du, Dan Wu, Qin Wei
An ultrasensitive sandwich-type photoelectrochemical (PEC) immunosensor was constructed for the detection of prostate specific antigen (PSA). In this work, Au-nanoparticle-loaded tungsten oxide (WO3-Au) hybrid composites was applied as PEC sensing platform, while Ca ions doped CdSe equipped on the conducting framework of reduced graphene oxide (rGO-Ca:CdSe) nanocomposites were employed as the signal amplification probe. As for WO3-Au, massive Au nanoparticles were formed on the surface of WO3 without any additional reducing agent, providing a novel nanocarriers for anchoring plenty of the primary antibodies due to the large specific surface area and good biocompatibility by chemical bonding between Au nanoparticles and -NH2 of antibodies...
May 10, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28498889/uk-anaesthetists-perspectives-and-experiences-of-severe-perioperative-anaphylaxis-nap6-baseline-survey%C3%A2
#20
H I Kemp, T M Cook, M Thomas, N J N Harper
Background: There is limited information on UK anaesthetists' perspectives and experiences of perioperative anaphylaxis. This baseline survey of the Sixth National Audit Project (NAP6) aimed to identify relevant departmental preparedness and practices, and individual experiences, perceptions and drug-avoidance patterns. Methods: All anaesthetists in 356 UK NHS hospitals were invited to complete an electronic survey. Results: 11 104 anaesthetists (77% crude response rate) from 341 (96%) hospitals responded...
May 12, 2017: British Journal of Anaesthesia
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