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Metabolic modulation

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https://www.readbyqxmd.com/read/29055087/metabolism-and-tam-functions-it-takes-two-to-tango
#1
REVIEW
Massimiliano Mazzone, Alessio Menga, Alessandra Castegna
From the evidence on clinical studies and experimental mouse models we now know that tumor associated macrophages (TAMs) sustain tumor development in many different ways. They play a role in angiogenesis, tumor cell invasion and metastasis formation. Additionally, TAMs interfere with natural killer and T cell antitumoral activities, producing an immune suppressive environment that protects tumor cell growth. This indicates that the tumoricidal activity of macrophages within the tumor microenviroment is lost due to an imbalance of the regulatory mechanisms underpinning these cells' function...
October 21, 2017: FEBS Journal
https://www.readbyqxmd.com/read/29054743/simultaneous-rna-seq-based-transcriptional-profiling-of-intracellular-brucella-abortus-and-b-abortus-infected-murine-macrophages
#2
Huynh Tan Hop, Lauren Togonon Arayan, Alisha Wehdnesday Bernardo Reyes, Tran Xuan Ngoc Huy, WonGi Min, Hu Jang Lee, Jee Soo Son, Suk Kim
Brucella is a zoonotic pathogen that survives within macrophages; however the replicative mechanisms involved are not fully understood. We describe the isolation of sufficient Brucella abortus RNA from primary host cell environment using modified reported methods for RNA-seq analysis, and simultaneously characterize the transcriptional profiles of intracellular B. abortus and bone marrow-derived macrophages (BMM) from BALB/c mice at 24 h (replicative phase) post-infection. Our results revealed that 25.12% (801/3190) and 16...
October 17, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29054557/optimization-of-hexanoic-acid-production-in-recombinant-escherichia-coli-by-precise-flux-rebalancing
#3
Seong Gyeong Kim, Sungho Jang, Jae Hyung Lim, Byoung Seung Jeon, Jungyeon Kim, Kyoung Heon Kim, Byoung-In Sang, Gyoo Yeol Jung
The aim of this study is to demonstrate that rebalancing of metabolic fluxes at acetyl-CoA branch node can substantially improve the titer and productivity of hexanoic acid in recombinant Escherichia coli strains. First, a hexanoic acid-producing E. coli strain was constructed by expressing genes encoding β-ketothiolase (BktB) from Cupriavidus necator and acetyl-CoA transferase (ACT) from Megasphaera sp. MH in a butyric acid producer strain. Next, metabolic flux was optimized at the acetyl-CoA branch node by fine-tuning the expression level of the gene for acetyl-CoA acetyltransferase (AtoB)...
October 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29054420/selenium-and-cancer-stem-cells
#4
Giuseppe Murdolo, Desirée Bartolini, Cristina Tortoioli, Marta Piroddi, Pierangelo Torquato, Francesco Galli
Selenium (Se) is an essential micronutrient that functions as "redox gatekeeper" and homeostasis factor of normal and cancer cells. Epidemiology and experimental studies, in the last years suggested that both inorganic and organic forms of Se may have favorable health effects. In this regard, a protective action of Se on cellular systems that may help preventing cancer cell differentiation has been demonstrated, while the hypothesis that Se compounds may cure cancer and its metastatic diffusion appears speculative and is still a matter of investigation...
2017: Advances in Cancer Research
https://www.readbyqxmd.com/read/29054418/selenium-and-breast-cancer-risk-focus-on-cellular-and-molecular-mechanisms
#5
Camile C Fontelles, Thomas P Ong
Selenium (Se) is a micronutrient with promising breast cancer prevention and treatment potential. There is extensive preclinical evidence of Se mammary carcinogenesis inhibition. Evidence from epidemiological studies is, however, unclear and intervention studies are rare. Here, we examine Se chemoprotection, chemoprevention, and chemotherapy effects in breast cancer, focusing on associated cellular and molecular mechanisms. Se exerts its protective actions through multiple mechanisms that involve antioxidant activities, induction of apoptosis, and inhibition of DNA damage, cell proliferation, angiogenesis, and invasion...
2017: Advances in Cancer Research
https://www.readbyqxmd.com/read/29054417/the-regulation-of-pathways-of-inflammation-and-resolution-in-immune-cells-and-cancer-stem-cells-by-selenium
#6
Bastihalli T Diwakar, Arvind M Korwar, Robert F Paulson, K Sandeep Prabhu
Cancer is a complex disease where cancer stem cells (CSCs) maintain unlimited replicative potential, but evade chemotherapy drugs through cellular quiescence. CSCs are able to give rise to bulk tumor cells that have the capability to override antiproliferative signals and evade apoptosis. Numerous pathways are dysregulated in tumor cells, where increased levels of prooxidant reactive oxygen and nitrogen species can lead to localized inflammation to exacerbate all three stages of tumorigenesis: initiation, progression, and metastasis...
2017: Advances in Cancer Research
https://www.readbyqxmd.com/read/29054415/selenium-dependent-glutathione-peroxidases-during-tumor-development
#7
Anna P Kipp
Five out of eight human glutathione peroxidases (GPxes) are selenoproteins and thus their expression depends on the selenium (Se) supply. Most Se-dependent GPxes are downregulated in tumor cells, while only GPx2 is considerably upregulated. Whether expression profiles of GPxes predict tumor development and patient survival is controversially discussed. Also, results from in vitro and in vivo studies modulating the expression of GPx isoforms provide evidence for both anti- and procarcinogenic mechanisms. GPxes are able to reduce hydroperoxides, which otherwise would damage DNA, possibly resulting in DNA mutations, modulate redox-sensitive signaling pathways affecting proliferation, differentiation, and cellular metabolism or initiate cell death...
2017: Advances in Cancer Research
https://www.readbyqxmd.com/read/29054323/human-kidney-stone-matrix-latent-potential-to-restrain-com-induced-cytotoxicity-and-inflammatory-response
#8
Shifa Narula, Simran Tandon, Prakash Baligar, Shrawan Kumar Singh, Chanderdeep Tandon
Kidney stone disease is a multi-factorial disorder resulting from the interplay of various risk factors including lifestyle, environment and genetics along with metabolic activities inside the body. However, it is difficult to determine how these factors converge to promote stone disease. Extensive investigations of kidney stone composition at the molecular level have been carried out however; its impact on the complex mechanism of stone formation is still obscure. Hence, an in vitro study was designed to investigate the attenuation of calcium oxalate toxicity by human kidney stone matrix proteins on NRK-52E cells using flowcytometry, Western blotting, RT-PCR and immunofluorescence assays...
October 17, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/29053802/docosahexaenoic-acid-supplementation-in-pregnancy-modulates-placental-cellular-signaling-and-nutrient-transport-capacity-in-obese-women
#9
Susanne Lager, Vanessa I Ramirez, Ometeotl Acosta, Christiane Meireles, Evelyn Miller, Francesca Gaccioli, Fredrick J Rosario, Jonathan A L Gelfond, Kevin Hakala, Susan T Weintraub, Debra A Krummel, Theresa L Powell
Context: Maternal obesity in pregnancy has profound impacts on maternal metabolism and promotes placental nutrient transport, which may contribute to fetal overgrowth in these pregnancies. The fatty acid docosahexaenoic acid (DHA) has bioactive properties that may improve outcomes in obese pregnant women by modulating placental function. Objective: To determine the effects of DHA supplementation in obese pregnant women on maternal metabolism and placental function...
October 18, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29053618/the-application-of-ultra-high-performance-liquid-chromatography-coupled-with-a-ltq-orbitrap-mass-technique-to-reveal-the-dynamic-accumulation-of-secondary-metabolites-in-licorice-under-aba-stress
#10
Da Li, Guojie Xu, Guangxi Ren, Yufeng Sun, Ying Huang, Chunsheng Liu
The traditional medicine licorice is the most widely consumed herbal product in the world. Although much research work on studying the changes in the active compounds of licorice has been reported, there are still many areas, such as the dynamic accumulation of secondary metabolites in licorice, that need to be further studied. In this study, the secondary metabolites from licorice under two different methods of stress were investigated by ultra-high-performance liquid chromatography coupled with hybrid linear ion trap-Orbitrap mass spectrometry (UHPLC-LTQ-Orbitrap-MS)...
October 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29053582/zinc-supplementation-improves-glucose-homeostasis-in-high-fat-fed-mice-by-enhancing-pancreatic-%C3%AE-cell-function
#11
Vinícius Cooper-Capetini, Diogo Antonio Alves de Vasconcelos, Amanda Roque Martins, Sandro Massao Hirabara, José Donato, Angelo Rafael Carpinelli, Fernando Abdulkader
Zinc is an essential component of the insulin granule and it possibly modulates insulin secretion and signaling. Since insulin resistance is a hallmark in the development of type 2 diabetes mellitus, this study aimed at investigating if zinc supplementation is able to improve glucose tolerance and β-cell function in a model of insulin resistance. Male C57BL/6 mice were distributed in four groups according to the diet: normal fat (NF); normal fat supplemented with ZnCl₂ (NFZ); high-fat (HF); and, high-fat chow supplemented with ZnCl₂ (HFZ)...
October 20, 2017: Nutrients
https://www.readbyqxmd.com/read/29053464/co-expression-network-approach-to-studying-the-effects-of-botulinum-neurotoxin-a
#12
Kavitha Mukund, Samuel R Ward, Richard L Lieber, Shankar Subramaniam
Botulinum Neurotoxin A (BoNT-A) is a potent neurotoxin with several clinical applications.The goal of this study was to utilize co-expression network theory to analyze temporal transcriptional data from skeletal muscle after BoNT-A treatment. Expression data for 2000 genes (extracted using a ranking heuristic) served as the basis for this analysis. Using weighted gene co-expression network analysis (WGCNA), we identified 19 co-expressed modules, further hierarchically clustered into 5 groups. Quantifying average expression and co-expression patterns across these groups revealed temporal aspects of muscle's response to BoNT-A...
October 16, 2017: IEEE/ACM Transactions on Computational Biology and Bioinformatics
https://www.readbyqxmd.com/read/29052509/a-yin-yang-1-mir-30a-regulatory-circuit-modulates-autophagy-in-pancreatic-cancer-cells
#13
Chuang Yang, Jing-Jing Zhang, Yun-Peng Peng, Yi Zhu, Ling-Di Yin, Ji-Shu Wei, Wen-Tao Gao, Kui-Rong Jiang, Yi Miao
BACKGROUND: Autophagy is a highly regulated biological process that mediates the degradation of intracellular components. It is required for tumor cell metabolism and homeostasis. Yin-Yang 1 (YY1) has been reported to be involved in autophagy in several carcinomas. However, its role in autophagy in pancreatic cancer, one of the deadliest human malignancies, is unknown. Here, we investigated the function of YY1 in pancreatic cancer cells autophagy and its mechanisms of action. METHODS: The activity of cells undergoing autophagy was assessed using transmission electron microscopy, immunofluorescence, and Western blotting...
October 19, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/29052471/a-review-about-lycopene-induced-nuclear-hormone-receptor-signalling-in-inflammation-and-lipid-metabolism-via-still-unknown-endogenous-apo-10%C3%A2-lycopenoids
#14
Catherine Caris-Veyrat, Ada L Garcia, Eric Reynaud, Renata Lucas, Gamze Aydemir, Ralph Rühl
Lycopene is the red pigment in tomatoes and tomato products and is an important dietary carotenoid found in the human organism. Lycopene-isomers, oxidative lycopene metabolites and apo-lycopenoids are found in the food matrix. Lycopene intake derived from tomato consumption is associated with alteration of lipid metabolism and a lower incidence of cardiovascular diseases (CVD). Lycopene is mainly described as a potent antioxidant but novel studies are shifting towards its metabolites and their capacity to mediate nuclear receptor signalling...
October 20, 2017: International Journal for Vitamin and Nutrition Research. Journal International de Vitaminologie et de Nutrition
https://www.readbyqxmd.com/read/29052285/fitness-related-differences-in-the-rate-of-whole-body-evaporative-heat-loss-in-exercising-men-are-heat-load-dependent
#15
Dallon T Lamarche, Sean R Notley, Jeffrey C Louie, Martin P Poirier, Glen P Kenny
The effect of aerobic fitness (defined as rate of peak oxygen consumption) on heat loss during exercise is thought to be related to the level of heat stress. However, it remains unclear at what combined exercise and environmental (net) heat load threshold these fitness-related differences occur. To identify this, we assessed whole-body heat exchange (dry and evaporative) by direct calorimetry in young (22 ± 3 years) men matched for physical characteristics with low (Low-fit) (39.8 ± 2.5 mLO2 ·kg(-1) ·min(-1) ), moderate (Mod-fit) (50...
October 20, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/29052133/ebv-infection-and-glucose-metabolism-in-nasopharyngeal-carcinoma
#16
Jun Zhang, Lin Jia, Chi Man Tsang, Sai Wah Tsao
To establish persistent infection in cells, viruses evolve strategies to alter host cellular pathways to regulate cell proliferation and energy metabolism which support viral infection. Epstein-Barr virus (EBV) undergoes both lytic and latent infection to achieve persistent and lifelong infection in human. EBV readily infects human B cells, driving their transformation to proliferative lymphoblastoid cell lines (LCL), and eventually establishes lifelong latent infection in memory B cells. In contrary, EBV undergoes lytic replication upon infection into normal epithelial cells which is essential for the replication of EBV genome and production of infectious viral particles for transmission through saliva...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29051608/transcription-factors-and-stress-response-gene-alterations-in-human-keratinocytes-following-solar-simulated-ultra-violet-radiation
#17
Thomas L Des Marais, Thomas Kluz, Dazhong Xu, Xiaoru Zhang, Lisa Gesumaria, Mary S Matsui, Max Costa, Hong Sun
Ultraviolet radiation (UVR) from sunlight is the major effector for skin aging and carcinogenesis. However, genes and pathways altered by solar-simulated UVR (ssUVR), a mixture of UVA and UVB, are not well characterized. Here we report global changes in gene expression as well as associated pathways and upstream transcription factors in human keratinocytes exposed to ssUVR. Human HaCaT keratinocytes were exposed to either a single dose or 5 repetitive doses of ssUVR. Comprehensive analyses of gene expression profiles as well as functional annotation were performed at 24 hours post irradiation...
October 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29051595/a-virus-carries-a-gene-encoding-juvenile-hormone-acid-methyltransferase-a-key-regulatory-enzyme-in-insect-metamorphosis
#18
Jun Takatsuka, Madoka Nakai, Tetsuro Shinoda
Microbial parasitism, infection, and symbiosis in animals often modulate host endocrine systems, resulting in alterations of phenotypic traits of the host that can have profound effects on the ecology and evolution of both the microorganisms and their hosts. Information about the mechanisms and genetic bases of such modulations by animal parasites is available from studies of steroid hormones. However, reports involving other hormones are scarce. We found that an insect virus, a betaentomopoxvirus, encodes a juvenile hormone acid methyltransferase that can synthesize an important insect hormone, the sesquiterpenoid juvenile hormone...
October 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29051554/recombinant-incretin-secreting-microbe-improves-metabolic-dysfunction-in-high-fat-diet-fed-rodents
#19
Paul M Ryan, Elaine Patterson, Robert M Kent, Helena Stack, Paula M O'Connor, Kiera Murphy, Veronica L Peterson, Rupasri Mandal, David S Wishart, Timothy G Dinan, John F Cryan, Randy J Seeley, Catherine Stanton, R Paul Ross
The gut hormone glucagon-like peptide (GLP)-1 and its analogues represent a new generation of anti-diabetic drugs, which have also demonstrated propensity to modulate host lipid metabolism. Despite this, drugs of this nature are currently limited to intramuscular administration routes due to intestinal degradation. The aim of this study was to design a recombinant microbial delivery vector for a GLP-1 analogue and assess the efficacy of the therapeutic in improving host glucose, lipid and cholesterol metabolism in diet induced obese rodents...
October 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29051480/nox4-functions-as-a-mitochondrial-energetic-sensor-coupling-cancer-metabolic-reprogramming-to-drug-resistance
#20
Karthigayan Shanmugasundaram, Bijaya K Nayak, William E Friedrichs, Dharam Kaushik, Ronald Rodriguez, Karen Block
The molecular mechanisms that couple glycolysis to cancer drug resistance remain unclear. Here we identify an ATP-binding motif within the NADPH oxidase isoform, NOX4, and show that ATP directly binds and negatively regulates NOX4 activity. We find that NOX4 localizes to the inner mitochondria membrane and that subcellular redistribution of ATP levels from the mitochondria act as an allosteric switch to activate NOX4. We provide evidence that NOX4-derived reactive oxygen species (ROS) inhibits P300/CBP-associated factor (PCAF)-dependent acetylation and lysosomal degradation of the pyruvate kinase-M2 isoform (PKM2)...
October 19, 2017: Nature Communications
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