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https://www.readbyqxmd.com/read/28430776/aminoazo-dye-protein-adduct-enhances-inhibitory-effect-on-digestibility-and-damages-to-gastro-duodenal-hepatic-axis
#1
Li-Yun Lin, Chiung-Chi Peng, Yeh Chen, Boa-Chan Huang, Chun Chao Chang, Robert Y Peng
4-Dimethylaminoazobenzene (DAB, methyl yellow, or butter yellow), a human carcinogen, has been banned for use in foods since 1988. In 2014, DAB adulteration in Tofu occurred in Taiwan. We hypothesize that DAB can form [DAB•SBP]adduct adduct with soybean protein (SBP) which could damage Gastro-Duodenal-Hepatic axis. Sprague-Dawley rats gavage fed [DAB•SBP]adduct adduct revealed severely reduced body weight and damaged duodenum, liver, hepatic mitochondria, and spleen. Hepatic levels of glutathione and ATP were severely reduced...
2017: PloS One
https://www.readbyqxmd.com/read/28430666/myc-induced-glutaminolysis-bypasses-hif-driven-glycolysis-in-hypoxic-small-cell-lung-carcinoma-cells
#2
Matilda Munksgaard Thorén, Marica Vaapil, Johan Staaf, Maria Planck, Martin E Johansson, Sofie Mohlin, Sven Påhlman
We previously demonstrated that small cell lung carcinoma (SCLC) cells lack HIF-2α protein expression, whereas HIF-1α in these cells is expressed at both acute and prolonged hypoxia. Here we show that low HIF2A expression correlates with high expression of MYC genes. Knockdown of HIF1A expression had no or limited effect on cell survival and growth in vitro. Unexpectedly, hypoxic ATP levels were not affected by HIF-1α knockdown and SCLC cell viability did not decrease upon glucose deprivation. In line with these in vitro data, xenograft tumor-take and growth were not significantly affected by repressed HIF1A expression...
April 6, 2017: Oncotarget
https://www.readbyqxmd.com/read/28430399/targeting-conformational-activation-of-cdk2-kinase
#3
Morgan Pellerano, Sergey Tcherniuk, Corine Perals, Thi Nhu Ngoc Van, Elsa Garcin, Florence Mahuteau-Betzer, Marie-Paule Teulade-Fichou, May C Morris
Cyclin-dependent kinases constitute attractive pharmacological targets for cancer therapeutics, yet inhibitors in clinical trials target the ATP-binding pocket of the CDK and therefore suffer from limited selectivity and emergence of resistance. The more recent development of allosteric inhibitors targeting conformational plasticity of protein kinases offers promising perspectives for therapeutics. In particular tampering with T-loop dynamics of CDK2 kinase would provide a selective means of inhibiting this kinase, by preventing its conformational activation...
April 21, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28430359/sulfur-containing-gaseous-signal-molecules-ion-channels-and-cardiovascular-diseases
#4
REVIEW
Wen Yu, Hongfang Jin, Chaoshu Tang, Junbao Du, Zhiren Zhang
Sulfur-containing gaseous signal molecules including hydrogen sulfide (H2 S) and sulfur dioxide (SO2 ) were previously recognized as toxic gases. However, extensive studies have revealed that they can be generated in the cardiovascular system via a sulfur-containing amino acid metabolic pathway, playing an important part in cardiovascular physiology and pathophysiology. Ion channels are pore-forming membrane proteins present in the membrane of all biological cells; functions include establishing a resting membrane potential and controlling action potentials and other electrical signals by conducting ions across the cell membrane...
April 21, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28430273/the-interfacing-structural-effect-of-ag-graphene-oxide-nanohybrid-films-on-surface-enhanced-raman-scattering
#5
Young-Kwan Kim, Gyeongsik Ok, Sung-Wook Choi, Hongje Jang, Dal-Hee Min
The interfacing structural effect of Ag/graphene oxide (GO) nanohybrid films on SERS was investigated by using Ag nanostructures immobilized on polyallylamine hydrochloride (PAA) functionalized-GO and reduced GO (RGO) films. We found that the electron transfer from Ag nanostructures to GO derivatives dominantly occurred at the interfaces between Ag nanostructures and the sp(2) carbon domains of GO and RGO films. By utilizing 4-aminothiophenol (4-ATP) as a Raman probe, it was revealed that this electron transfer process augmented the enhancement factor (EF) of 4-ATP up to ∼1...
April 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28429991/effects-of-medium-chain-triglycerides-on-intestinal-morphology-and-energy-metabolism-of-intrauterine-growth-retarded-weanling-piglets
#6
Li-Li Zhang, Hao Zhang, Yue Li, Tian Wang
It has been shown that there is a relationship between intrauterine growth retardation (IUGR) and postnatal intestinal damage involved in energy deficits. Therefore, the present study was conducted to investigate the effect of medium-chain triglycerides (MCT) on the intestinal morphology, intestinal function and energy metabolism of piglets with IUGR. At weaning (21 ± 1.1 d of age), 24 IUGR piglets and 24 normal birth weight (NBW) piglets were selected according to their birth weights (BW) (IUGR: 0.95 ± 0...
June 2017: Archives of Animal Nutrition
https://www.readbyqxmd.com/read/28429918/relationship-between-fruit-and-vegetable-intake-and-the-risk-of-metabolic-syndrome-and-its-disorders-in-korean-women-according-to-menopausal-status
#7
Seo Ah Hong, Mi Kyung Kim
BACKGROUND AND OBJECTIVES: The association between fruit and vegetable (FV) intake and risk of the metabolic syndrome (MetS) has not been elucidated fully, particularly by menopausal status. Method and Study Design: The study population was 2,999 women aged 40-64 years participating in the 4th Korea National Health and Nutrition Examination Survey. The definition of MetS and its components was based on the modified National Cholesterol Education Program Adult Treatment Panel III (NCEP ATP III) for Koreans...
May 2017: Asia Pacific Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28429857/ndufa4l2-protects-against-ischemia-reperfusion-induced-cardiomyocyte-apoptosis-and-mitochondrial-dysfunction-by-inhibiting-complex-i
#8
Jianhua Li, Caiyan Bai, Junxia Guo, Wanqian Liang, Jingning Long
Myocardial ischemia/reperfusion (I/R) injury may cause the apoptosis of cardiomyocytes as well as mitochondrial dysfunction. The aims of the present study were to investigate whether NADH dehydrogenase 1 alpha subcomplex subunit 4-like 2 (NDUFA4L2) on myocardial ischemia-reperfusion (I/R) injury and the underlying molecular mechanism. The hypoxia-reperfusion (H/R) model was established in vitro using H9c2 cells to simulate I/R injury. NDUFA4L2 and complex I expression levels were detected using RT-PCR and western blot...
April 21, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28429453/tolcapone-induces-oxidative-stress-leading-to-apoptosis-and-inhibition-of-tumor-growth-in-neuroblastoma
#9
Tyler Maser, Maria Rich, David Hayes, Ping Zhao, Abhinav B Nagulapally, Jeffrey Bond, Giselle Saulnier Sholler
Catechol-O-methyltransferase (COMT) is an enzyme that inactivates dopamine and other catecholamines by O-methylation. Tolcapone, a drug commonly used in the treatment of Parkinson's disease, is a potent inhibitor of COMT and previous studies indicate that Tolcapone increases the bioavailability of dopamine in cells. In this study, we demonstrate that Tolcapone kills neuroblastoma (NB) cells in preclinical models by inhibition of COMT. Treating four established NB cells lines (SMS-KCNR, SH-SY5Y, BE(2)-C, CHLA-90) and two primary NB cell lines with Tolcapone for 48 h decreased cell viability in a dose-dependent manner, with IncuCyte imaging and Western blotting indicating that cell death was due to caspase-3-mediated apoptosis...
April 21, 2017: Cancer Medicine
https://www.readbyqxmd.com/read/28429338/caffeic-acid-n-butyl-ester-triggered-necrosis-like-cell-death-in-lung-cancer-cell-line-a549-is-prompted-by-ros-mediated-alterations-in-mitochondrial-membrane-potential
#10
Y-X Zhang, P-F Yu, Z-M Gao, J Yuan, Z Zhang
OBJECTIVE: The aim of the present study was to evaluate the anticancer activity of caffeic acid n-butyl ester against lung cancer cell line A549 and to investigate the underlying mechanism. MATERIALS AND METHODS: IC50 was determined by MTT assay. Fluorescent probes DCFH-DA, Indo 1/AM, DiOC6 were used to determine ROS, Ca2+, and mitochondrial membrane potential (ΔΨm). ATP levels were determined by using ATP liteTM kit. DNA damage was investigated by DAPI and comet assays...
April 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28429330/growth-kinetics-fatty-acid-composition-and-metabolic-activity-changes-of-crypthecodinium-cohnii-under-different-nitrogen-source-and-concentration
#11
Waseem Safdar, Muhammad Shamoon, Xinyi Zan, Junaid Haider, Hafiz Rizwan Sharif, Muhammad Shoaib, Yuanda Song
The effect of varying concentrations of the nitrogen source on the growth kinetics, lipid accumulation, lipid and DHA productivity, and fatty acid composition of C. cohnii was elucidated. Growth of C. cohnii was in three distinct growth stages: cell growth, lipid accumulation and a final lipid turnover stage. Most of lipids were accumulated in lipid accumulation stage (48-120 h) though, slow growth rate was observed during this stage. NaNO3 supported significantly higher lipid content (26.9% of DCW), DHA content (0...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28429326/wax-ester-fermentation-and-its-application-for-biofuel-production
#12
Hiroshi Inui, Takahiro Ishikawa, Masahiro Tamoi
In Euglena cells under anaerobic conditions, paramylon, the storage polysaccharide, is promptly degraded and converted to wax esters. The wax esters synthesized are composed of saturated fatty acids and alcohols with chain lengths of 10-18, and the major constituents are myristic acid and myristyl alcohol. Since the anaerobic cells gain ATP through the conversion of paramylon to wax esters, the phenomenon is named "wax ester fermentation". The wax ester fermentation is quite unique in that the end products, i...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28429325/gravitaxis-in-euglena
#13
Donat-P Häder, Ruth Hemmersbach
Motile microorganisms utilize a number of responses to external stimuli including light, temperature, chemicals as well as magnetic and electric fields. Gravity is a major clue to select a niche in their environment. Positive gravitaxis leads an organism down into the water column and negative gravitaxis brings it to the surface. In Euglena the precision of gravitaxis is regulated by an internal rhythm entrained by the daily light/dark cycle. This and the cooperation with phototaxis bring the cells into an optimal position in the water column...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28429324/photomovement-in-euglena
#14
Donat-P Häder, Mineo Iseki
Motile microorganisms such as the green Euglena gracilis use a number of external stimuli to orient in their environment. They respond to light with photophobic responses, photokinesis and phototaxis, all of which can result in accumulations of the organisms in suitable habitats. The light responses operate synergistically with gravitaxis, aerotaxis and other responses. Originally the microscopically obvious stigma was thought to be the photoreceptor, but later the paraxonemal body (PAB, paraflagellar body) has been identified as the light responsive organelle, located in the trailing flagellum inside the reservoir...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28429315/the-mitochondrion-of-euglena-gracilis
#15
Verena Zimorski, Cessa Rauch, Jaap J van Hellemond, Aloysius G M Tielens, William F Martin
In the presence of oxygen, Euglena gracilis mitochondria function much like mammalian mitochondria. Under anaerobiosis, E. gracilis mitochondria perform a malonyl-CoA independent synthesis of fatty acids leading to accumulation of wax esters, which serve as the sink for electrons stemming from glycolytic ATP synthesis and pyruvate oxidation. Some components (enzymes and cofactors) of Euglena's anaerobic energy metabolism are found among the anaerobic mitochondria of invertebrates, others are found among hydrogenosomes, the H2-producing anaerobic mitochondria of protists...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28429156/crystallization-and-preliminary-x-ray-diffraction-analysis-of-a-mammal-inositol-1-3-4-5-6-pentakisphosphate-2-kinase
#16
Elsa Franco-Echevarría, Julia Sanz-Aparicio, Nathalie Troffer-Charlier, Arnaud Poterszman, Beatriz González
Inositol 1,3,4,5,6-pentakisphosphate 2-kinase (IP5 2-K) is an enzyme that catalyses the formation of phytic acid (IP6) from IP5 and ATP. In mammals, IP6 is involved in multiple events such as DNA repair and mRNA edit and it is the precursor of inositol pyrophosphates, emerging compounds shown to have an essential role in apoptosis. In addition, IP5 2-K have functions in cells independently of its catalytic activity, for example in rRNA biogenesis. We pursue the structure determination of a mammal IP5 2-K by Protein Crystallography...
April 21, 2017: Protein Journal
https://www.readbyqxmd.com/read/28428949/p2x1-p2x4-and-p2x7-receptor-knock-out-mice-expose-differential-outcome-of-sepsis-induced-by-%C3%AE-haemolysin-producing-escherichia-coli
#17
Anne-Sofie Greve, Marianne Skals, Steen K Fagerberg, Wulf Tonnus, Svend Ellermann-Eriksen, Richard J Evans, Andreas Linkermann, Helle A Praetorius
α-haemolysin (HlyA)-producing Escherichia coli commonly inflict severe urinary tract infections, including pyelonephritis, which comprises substantial risk for sepsis. In vitro, the cytolytic effect of HlyA is mainly mediated by ATP release through the HlyA pore and subsequent P2X1/P2X7 receptor activation. This amplification of the lytic process is not unique to HlyA but is observed by many other pore-forming proteins including complement-induced haemolysis. Since free hemoglobin in the blood is known to be associated with a worse outcome in sepsis one could speculate that inhibition of P2X receptors would ameliorate the course of sepsis...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28428881/nano-pulse-stimulation-is-a-physical-modality-that-can-trigger-immunogenic-tumor-cell-death
#18
Richard Nuccitelli, Amanda McDaniel, Snjezana Anand, John Cha, Zachary Mallon, Jon Casey Berridge, Darrin Uecker
BACKGROUND: We have been developing a non-thermal, drug-free tumor therapy called Nano-Pulse Stimulation (NPS) that delivers ultrashort electric pulses to tumor cells which eliminates the tumor and inhibits secondary tumor growth. We hypothesized that the mechanism for inhibiting secondary tumor growth involves stimulating an adaptive immune response via an immunogenic form of apoptosis, commonly known as immunogenic cell death (ICD). ICD is characterized by the emission of danger-associated molecular patterns (DAMPs) that serve to recruit immune cells to the site of the tumor...
2017: Journal for Immunotherapy of Cancer
https://www.readbyqxmd.com/read/28428480/exposure-to-high-glucose-concentration-decreases-cell-surface-abca1-and-hdl-biogenesis-in-hepatocytes
#19
Maki Tsujita, Mohammad Anwar Hossain, Rui Lu, Tomoe Tsuboi, Kuniko Okumura-Noji, Shinji Yokoyama
AIM: To study atherosclerosis risk in diabetes, we investigated ATP-binding cassette transporter A1 (ABCA1) expression and high-density lipoprotein (HDL) biogenesis in the liver and hepatocytes under hyperglycemic conditions. METHODS AND RESULTS: In streptozotocin-induced diabetic mice, plasma HDL decreased while ABCA1 protein increased without changing its mRNA in the liver, only in the animals that responded to the treatment to show hypoinsulinemia and fasting hyperglycemia but not in the poor responders not showing those...
April 19, 2017: Journal of Atherosclerosis and Thrombosis
https://www.readbyqxmd.com/read/28428253/twitchin-kinase-inhibits-muscle-activity
#20
Yohei Matsunaga, Hyundoo Hwang, Barbara Franke, Rhys Williams, McKenna Penley, Hiroshi Qadota, Hong Yi, Levi T Morran, Hang Lu, Olga Mayans, Guy M Benian
Muscle sarcomeres contain giant polypeptides composed of multiple immunoglobulin and fibronectin domains and one or two protein kinase domains. Although binding partners for a number of this family's kinase domains have been identified, the catalytic necessity of these kinase domains remains unknown. In addition, various members of this kinase family are suspected pseudokinases with no, or little, activity. Here, we address catalytic necessity for the first time using the prototypic invertebrate representative twitchin (UNC-22) from C...
April 20, 2017: Molecular Biology of the Cell
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