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Metabolic modulation

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https://www.readbyqxmd.com/read/29458112/compatible-osmolytes-modulate-mitochondrial-function-in-a-marine-osmoconformer-crassostrea-gigas-thunberg-1793
#1
Eugene P Sokolov, Inna M Sokolova
Salinity is an important environmental factor affecting physiology of marine organisms. Osmoconformers such as marine mollusks maintain metabolic function despite changes of the osmolarity and composition of the cytosol during salinity shifts. Currently, metabolic responses to the salinity-induced changes of the intracellular milieu are not well understood. We studied the effects of osmolarity (450 vs. 900 mOsm) and compatible osmolytes (70-590 mM of taurine or betaine) on isolated gill mitochondria of a marine osmoconformer, the Pacific oyster Crassostrea gigas...
February 16, 2018: Mitochondrion
https://www.readbyqxmd.com/read/29458109/modulation-of-cyp1a1-metabolism-from-adverse-health-effects-to-chemoprevention-and-therapeutic-options
#2
Melina Mescher, Thomas Haarmann-Stemmann
The human cytochrome P450 (CYP) 1A1 gene encodes a monooxygenase that metabolizes multiple exogenous and endogenous substrates. CYP1A1 has become infamous for its oxidative metabolism of benzo[a]pyrene and related polycyclic aromatic hydrocarbons, converting these chemicals into very potent human carcinogens. CYP1A1 expression is mainly controlled by the aryl hydrocarbon receptor (AHR), a transcription factor whose activation is induced by binding of persistent organic pollutants, including polycyclic aromatic hydrocarbons and dioxins...
February 16, 2018: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/29458067/fluctuations-of-extracellular-glucose-and-lactate-in-the-mouse-primary-visual-cortex-during-visual-stimulation
#3
Alexandria Béland-Millar, Claude Messier
We measured the extracellular glucose and lactate in the primary visual cortex in the CD-1 mouse using electrochemical electrodes. To gain some additional information on brain metabolism, we examined the impact of systemic injections of lactate and fructose on the brain extracellular glucose and lactate changes observed during visual stimulation. We found that simple stimulation using a flashlight produced a decrease in visual cortex extracellular glucose and an increase in extracellular lactate. Similar results were observed following visual stimulation with an animated movie without soundtrack or the presentation of a novel object...
February 16, 2018: Behavioural Brain Research
https://www.readbyqxmd.com/read/29458019/raffinose-from-costus-speciosus-attenuates-lipid-synthesis-through-modulation-of-ppars-srebp1c-and-improves-insulin-sensitivity-through-pi3k-akt
#4
Muthukumaran Padmanaban, Thiyagarajan Gopal, Arun Babu Rajendran, Baddireddi Subhadra Lakshmi
Among several metabolic disorders, the pathogenesis of insulin resistance is considered to be multifactorial. Raffinose, an oligosaccharide isolated from the rhizome of Costus speciosus showed ≤50% inhibition of lipid accumulation in differentiated HepG2 and 3T3-L1 cells through exhibiting partial agonism to PPARγ, and, an enhanced secretion of adiponectin in 3T3-L1 adipocytes. Raffinose was also observed to attenuate the expression of SREBP1c, ACC and FAS which are involved in the fatty acid synthesis. A corresponding upregulation of PPARα and ACO involved in fatty acid oxidation was observed in steatotic HepG2 hepatocytes and 3T3-L1 adipocytes...
February 16, 2018: Chemico-biological Interactions
https://www.readbyqxmd.com/read/29457974/a-multi-omics-analysis-of-glycine-max-leaves-reveals-alteration-in-flavonoid-and-isoflavonoid-metabolism-upon-ethylene-and-abscisic-acid-treatment
#5
Ravi Gupta, Cheol Woo Min, Katharina Kramer, Ganesh Kumar Agrawal, Randeep Rakwal, Ki-Hun Park, Yiming Wang, Iris Finkemeier, Sun Tae Kim
Phytohormones are central to the plant growth and development. Despite the advancement in our knowledge of hormone signaling, downstream targets and their interactions upon hormones action remain largely fragmented, especially at the protein and metabolite levels. With an aim to get new insight into the effects of two hormones, ethylene (ET) and abscisic acid (ABA), this study utilizes an integrated proteomics and metabolomics approach to investigate their individual and combined (ABA+ET) signaling in soybean leaves...
February 19, 2018: Proteomics
https://www.readbyqxmd.com/read/29457144/functional-near-infrared-spectroscopy-enabling-routine-functional-brain-imaging
#6
Meryem A Yücel, Juliette J Selb, Theodore J Huppert, Maria Angela Franceschini, David A Boas
Functional Near-Infrared Spectroscopy (fNIRS) maps human brain function by measuring and imaging local changes in hemoglobin concentrations in the brain that arise from the modulation of cerebral blood flow and oxygen metabolism by neural activity. Since its advent over 20 years ago, researchers have exploited and continuously advanced the ability of near infrared light to penetrate through the scalp and skull in order to non-invasively monitor changes in cerebral hemoglobin concentrations that reflect brain activity...
December 2017: Current Opinion in Biomedical Engineering
https://www.readbyqxmd.com/read/29456553/silencing-of-iron-and-heme-related-genes-revealed-a-paramount-role-of-iron-in-the-physiology-of-the-hematophagous-vector-rhodnius-prolixus
#7
Ana B Walter-Nuno, Mabel L Taracena, Rafael D Mesquita, Pedro L Oliveira, Gabriela O Paiva-Silva
Iron is an essential element for most organisms However, free iron and heme, its complex with protoporphyrin IX, can be extremely cytotoxic, due to the production of reactive oxygen species, eventually leading to oxidative stress. Thus, eukaryotic cells control iron availability by regulating its transport, storage and excretion as well as the biosynthesis and degradation of heme. In the genome of Rhodnius prolixus , the vector of Chagas disease, we identified 36 genes related to iron and heme metabolism We performed a comprehensive analysis of these genes, including identification of homologous genes described in other insect genomes...
2018: Frontiers in Genetics
https://www.readbyqxmd.com/read/29455665/pten-ptenp1-regulating-the-regulator-of-rtk-dependent-pi3k-akt-signalling-new-targets-for-cancer-therapy
#8
REVIEW
Nahal Haddadi, Yiguang Lin, Glena Travis, Ann M Simpson, Eileen M McGowan, Najah T Nassif
Regulation of the PI-3 kinase (PI3K)/Akt signalling pathway is essential for maintaining the integrity of fundamental cellular processes, cell growth, survival, death and metabolism, and dysregulation of this pathway is implicated in the development and progression of cancers. Receptor tyrosine kinases (RTKs) are major upstream regulators of PI3K/Akt signalling. The phosphatase and tensin homologue (PTEN), a well characterised tumour suppressor, is a prime antagonist of PI3K and therefore a negative regulator of this pathway...
February 19, 2018: Molecular Cancer
https://www.readbyqxmd.com/read/29455645/pyruvate-kinase-m2-fuels-multiple-aspects-of-cancer-cells-from-cellular-metabolism-transcriptional-regulation-to-extracellular-signaling
#9
REVIEW
Ming-Chuan Hsu, Wen-Chun Hung
Originally identified as a metabolic enzyme that catalyzes the transfer of a phosphate group from phosphoenolpyruvate (PEP) to ADP in the glycolytic pathway, pyruvate kinase M2-type (PKM2) has been shown to exhibit novel biological activities in the nucleus and outside the cells. Although cell-based studies reveal new non-canonical functions of PKM2 in gene transcription, epigenetic modulation and cell cycle progression, the importance of these non-canonical functions in PKM2-mediated tumorigenesis is still under debate because studies in genetically modified mice do not consistently echo the findings observed in cultured cancer cells...
February 19, 2018: Molecular Cancer
https://www.readbyqxmd.com/read/29455429/predictive-performance-of-physiologically-based-pharmacokinetic-models-in-predicting-drug-drug-interactions-involving-enzyme-modulation
#10
Chia-Hsiang Hsueh, Vicky Hsu, Yuzhuo Pan, Ping Zhao
BACKGROUND: Physiologically-based pharmacokinetic (PBPK) modeling in predicting metabolic drug-drug interactions (mDDIs) is routinely used in drug development. Currently, the US FDA endorses the use of PBPK to potentially support dosing recommendations for investigational drugs as enzyme substrates of mDDIs, and to inform a lack of mDDIs for investigational drugs as enzyme modulators. METHODS: We systematically evaluated the performance of PBPK modeling in predicting mDDIs published in the literature...
February 17, 2018: Clinical Pharmacokinetics
https://www.readbyqxmd.com/read/29455364/hyperirisinemia-is-independently-associated-with-subclinical-hypothyroidism-correlations-with-cardiometabolic-biomarkers-and-risk-factors
#11
Theodora Stratigou, Maria Dalamaga, Georgios Antonakos, Ioanna Marinou, Evaggelos Vogiatzakis, Gerasimos Socrates Christodoulatos, Irene Karampela, Athanasios G Papavassiliou
PURPOSE: Irisin, a newly discovered adipo-myokine, is implicated in the modulation of the adipose phenotype, increasing energy expenditure and ameliorating systemic metabolism. Our aim was to investigate circulating irisin in subclinical hypothyroidism (SH) and study its associations with cardiometabolic risk factors. METHODS: In a large case-control study, serum irisin, insulin resistance and lipid parameters, classic adipokines, inflammatory and hepatic biomarkers, and cardiovascular risk factors were determined in 120 consecutive patients with SH and 120 healthy controls matched on age, gender, and date of blood draw...
February 17, 2018: Endocrine
https://www.readbyqxmd.com/read/29455338/extracellular-atp-is-differentially-metabolized-on-papillary-thyroid-carcinoma-cells-surface-in-comparison-to-normal-cells
#12
Ana Paula Santin Bertoni, Rafael Paschoal de Campos, Marisa Tsao, Elizandra Braganhol, Tania Weber Furlanetto, Márcia Rosângela Wink
The incidence of differentiated thyroid cancer has been increasing. Nevertheless, its molecular mechanisms are not well understood. In recent years, extracellular nucleotides and nucleosides have emerged as important modulators of tumor microenvironment. Extracellular ATP is mainly hydrolyzed by NTPDase1/CD39 and NTPDase2/CD39L1, generating AMP, which is hydrolyzed by ecto-5'-nucleotidase (CD73) to adenosine, a possible promoter of tumor growth and metastasis. There are no studies evaluating the expression and functionality of these ectonucleotidases on normal or tumor-derived thyroid cells...
February 17, 2018: Cancer Microenvironment: Official Journal of the International Cancer Microenvironment Society
https://www.readbyqxmd.com/read/29454997/regulatory-responses-of-hepatocytes-macrophages-and-vascular-endothelial-cells-to-magnesium-deficiency
#13
Mei Shigematsu, Shozo Tomonaga, Fumie Shimokawa, Masaru Murakami, Toru Imamura, Tohru Matsui, Masayuki Funaba
The liver is the organ that responds to nutritional disturbances including magnesium deficiency. The present study evaluated cellular responses to magnesium deficiency using model cells of the liver, namely, HepG2 cells as hepatocytes, RAW264.7 cells as Kupffer cells and human umbilical vein endothelial cells (HUVECs) as vascular endothelial cells; we examined effects of culture with magnesium deficient medium on cell responses in individual types of cells as well as interactive responses among cells. Metabolomic analyses indicated that magnesium deficiency differentially affected the cellular content of metabolites among HepG2 cells, RAW264...
February 2, 2018: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/29454926/chinese-patent-medicine-xin-ke-shu-inhibits-ca-2-overload-and-dysfunction-of-fatty-acid-%C3%AE-oxidation-in-rats-with-myocardial-infarction-induced-by-lad-ligation
#14
Yong Yang, Hongmei Jia, Meng Yu, Chao Zhou, Lili Sun, Yang Zhao, Hongwu Zhang, Zhongmei Zou
Myocardial infarction (MI) occurs during a sustained insufficient blood supply to the heart, eventually leading to myocardial necrosis. Xin-Ke-Shu tablet (XKS) is a prescription herbal compound and a patented medicine extensively used in the clinical treatment of coronary heart disease (CHD). To understand the molecular mechanism of the XKS action against MI in detail, it is necessary to investigate the altered metabolome and related pathways coincident with clinical features. In this study, tissue-targeted metabonomics based on ultra-high-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF/MS) were developed to explore the metabolic changes associated with XKS treatment in the heart tissue of rats with MI induced by a left anterior descending coronary artery ligation (LAD)...
February 3, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29454748/fatty-acid-binding-protein-4-fabp4-overexpression-in-intratumoral-hepatic-stellate-cells-within-hepatocellular-carcinoma-with-metabolic-risk-factors
#15
Norimichi Chiyonobu, Shu Shimada, Yoshimitsu Akiyama, Kaoru Mogushi, Michiko Itoh, Keiichi Akahoshi, Satoshi Matsumura, Kosuke Ogawa, Hiroaki Ono, Yusuke Mitsunori, Daisuke Ban, Atsushi Kudo, Shigeki Arii, Takayoshi Suganami, Shoji Yamaoka, Yoshihiro Ogawa, Minoru Tanabe, Shinji Tanaka
Metabolic syndrome is a newly identified risk factor for hepatocellular carcinoma (HCC); however, tumor-specific biomarkers still remain unclear. We performed cross-species analysis to compare gene signatures of HCC from human patients and melanocortin 4 receptor-knockout (MC4R-KO) mice, which develop HCC with obesity, insulin resistance, and dyslipidemia. Unsupervised hierarchical clustering and principle component analysis of 746 differentially expressed orthologous genes classified HCC of 152 human patients and MC4R-KO mice into two distinct subgroups, one of which included mouse HCC and was etiologically associated with metabolic risk factors...
February 15, 2018: American Journal of Pathology
https://www.readbyqxmd.com/read/29454707/crystal-structure-of-the-capsid-protein-from-zika-virus
#16
Zifang Shang, Hao Song, Yi Shi, Jianxun Qi, George F Gao
Recently, Zika virus (ZIKV) emerged as a global public health concern, and is distinct from other flaviviruses in many aspects, e.g., causing transplacental infection, fetal abnormalities and vector-independent transmission through body fluids in humans. The capsid (C) protein is a multifunctional protein, since it binds to viral RNA in the process of nucleocapsid assembly and plays important roles in virus infection processes by interacting with cellular proteins, modulating cellular metabolism, apoptosis and immune response...
February 15, 2018: Journal of Molecular Biology
https://www.readbyqxmd.com/read/29454575/targeting-complement-mediated-immunoregulation-for-cancer-immunotherapy
#17
REVIEW
Martin Kolev, Maciej M Markiewski
Complement was initially discovered as an assembly of plasma proteins "complementing" the cytolytic activity of antibodies. However, our current knowledge places this complex system of several plasma proteins, receptors, and regulators in the center of innate immunity as a bridge between the initial innate responses and adaptive immune reactions. Consequently, complement appears to be pivotal for elimination of pathogens, not only as an early response defense, but by directing the subsequent adaptive immune response...
February 14, 2018: Seminars in Immunology
https://www.readbyqxmd.com/read/29454105/assessing-the-repeatability-of-absolute-cmro-2-oef-and-haemodynamic-measurements-from-calibrated-fmri
#18
Alberto Merola, Michael A Germuska, Kevin Murphy, Richard G Wise
As energy metabolism in the brain is largely oxidative, the measurement of cerebral metabolic rate of oxygen consumption (CMRO 2 ) is a desirable biomarker for quantifying brain activity and tissue viability. Currently, PET techniques based on oxygen isotopes are the gold standard for obtaining whole brain CMRO 2 maps. Among MRI techniques that have been developed as an alternative are dual calibrated fMRI (dcFMRI) methods, which exploit simultaneous measurements of BOLD and ASL signals during a hypercapnic-hyperoxic experiment to modulate brain blood flow and oxygenation...
February 14, 2018: NeuroImage
https://www.readbyqxmd.com/read/29454068/o-glcnacylation-of-rack1-promotes-hepatocellular-carcinogenesis
#19
Fangfang Duan, Hao Wu, Dongwei Jia, Weicheng Wu, Shifang Ren, Lan Wang, Shushu Song, Xinying Guo, Fenglin Liu, Yuanyuan Ruan, Jianxin Gu
BACKGROUND & AIMS: Aberrant oncogenic mRNA translation and protein O-linked β-N-acetylglucosaminylation (O-GlcNAcylation) are general features during tumorigenesis. Nevertheless, whether and how these two pathways are interlinked remain unknown. Our previous study indicated that ribosomal RACK1 promoted the chemoresistance and growth in hepatocellular carcinoma (HCC). The aim of this study is to examine the role of RACK1 O-GlcNAcylation in oncogene translation and HCC carcinogenesis...
February 14, 2018: Journal of Hepatology
https://www.readbyqxmd.com/read/29453982/glucagon-like-peptide-1-contributes-to-increases-abca1-expression-by-downregulating-mir-758-to-regulate-cholesterol-homeostasis
#20
Yue Yao, Qiang Li, Ping Gao, Wei Wang, Lili Chen, Jinchao Zhang, Yi Xu
Abnormal regulation of lipid metabolism is associated with type 2 diabetes mellitus (T2DM). GLP-1 as a new treatment for T2DM, has unique effects in modulating cholesterol homeostasis. However, the mechanism of this effect is largely missing. The aim of this study was to determine the effects of GLP-1 on cholesterol-induced lipotoxicity in hepatocytes and examine the underlying mechanisms. The cell viability was determined, and caspase-3 was used to detect the effects of GLP-1 on cholesterol-induced apoptosis...
February 14, 2018: Biochemical and Biophysical Research Communications
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