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https://www.readbyqxmd.com/read/28315453/defects-in-mitochondrial-energetic-function-compels-fanconi-anemia-cells-to-glycolytic-metabolism
#1
Enrico Cappelli, Paola Cuccarolo, Giorgia Stroppiana, Maurizio Miano, Roberta Bottega, Vanessa Cossu, Paolo Degan, Silvia Ravera
Energetic metabolism plays an essential role in the differentiation of haematopoietic stem cells (HSC). In Fanconi Anaemia (FA), DNA damage is accumulated during HSC differentiation, an event that is likely associated with bone marrow failure (BMF). One of the sources of the DNA damage is altered mitochondrial metabolism and an associated increment of oxidative stress. Recently, altered mitochondrial morphology and a deficit in the energetic activity in FA cells have been reported. Considering that mitochondria are the principal site of aerobic ATP production, we investigated FA metabolism in order to understand what pathways are able to compensate for this energy deficiency...
March 14, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28315000/polyphenol-metabolism-in-differently-colored-cultivars-of-red-currant-ribes-rubrum-l-through-fruit-ripening
#2
Zala Zorenc, Robert Veberic, Darinka Koron, Silvija Miosic, Olly Sanny Hutabarat, Heidi Halbwirth, Maja Mikulic-Petkovsek
Rare red currants colors caused by low anthocyanin content in the pink and a lack of anthocyanins in the white cultivar correlated with low ANS gene expression, enzyme activity, and increased sugar/acid ratios. Changes in the contents of polyphenols, sugars, and organic acids in berries of the three differently colored Ribes rubrum L. cultivars ('Jonkheer van Tets', 'Pink Champagne', and 'Zitavia') were determined by LC-MS and HPLC at 4 sampling times during the last month of fruit ripening. The activities of the main flavonoid enzymes, chalcone synthase/chalcone isomerase (CHS/CHI), flavanone 3-hydroxylase (FHT), and dihydroflavonol 4-reductase (DFR), and the expression of anthocyanidin synthase (ANS) were additionally measured...
March 17, 2017: Planta
https://www.readbyqxmd.com/read/28314116/secretory-proteome-analysis-of-streptomycin-resistant-mycobacterium-tuberculosis-clinical-isolates
#3
Divakar Sharma, Deepa Bisht
Tuberculosis still remains one of the most fatal infectious diseases. Streptomycin (SM) is the drug of choice, especially for patients with multidrug-resistant tuberculosis or category II patients, because it targets the protein synthesis machinery by interacting with steps of translation. Several mechanisms have been proposed to explain the resistance, but our knowledge is inadequate. Secretome often plays an important role in pathogenesis and is considered an attractive reservoir for the development of novel diagnostic markers and targets...
March 1, 2017: SLAS Discov
https://www.readbyqxmd.com/read/28299505/changes-in-membrane-lipids-drive-increased-endocytosis-following-fas-ligation
#4
Mauro Degli Esposti, Paola Matarrese, Antonella Tinari, Agostina Longo, Serena Recalchi, Roya Khosravi-Far, Walter Malorni, Roberta Misasi, Tina Garofalo, Maurizio Sorice
Once activated, some surface receptors promote membrane movements that open new portals of endocytosis, in part to facilitate the internalization of their activated complexes. The prototypic death receptor Fas (CD95/Apo1) promotes a wave of enhanced endocytosis that induces a transient intermixing of endosomes with mitochondria in cells that require mitochondria to amplify death signaling. This initiates a global alteration in membrane traffic that originates from changes in key membrane lipids occurring in the endoplasmic reticulum (ER)...
March 15, 2017: Apoptosis: An International Journal on Programmed Cell Death
https://www.readbyqxmd.com/read/28294170/exploring-inter-organ-crosstalk-to-uncover-mechanisms-that-regulate-%C3%AE-cell-function-and-mass
#5
REVIEW
J Shirakawa, D F De Jesus, R N Kulkarni
Impaired β-cell function and insufficient β-cell mass compensation are twin pathogenic features that underlie type 2 diabetes (T2D). Current therapeutic strategies continue to evolve to improve treatment outcomes in different ethnic populations and include approaches to counter insulin resistance and improve β-cell function. Although the effects of insulin secretion on metabolic organs such as liver, skeletal muscle and adipose is directly relevant for improving glucose uptake and reduce hyperglycemia, the ability of pancreatic β-cells to crosstalk with multiple non-metabolic tissues is providing novel insights into potential opportunities for improving β-cell function and/or mass that could have beneficial effects in patients with diabetes...
March 15, 2017: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28287842/the-correlation-between-insulin-like-growth-factor-1-igf-1-and-novel-adipocytokines-in-postmenopausal-women-a-population-based-study
#6
Hossein Darabi, Afshin Ostovar, Alireza Raeisi, Mohammad Reza Kalantarhormozi, Majid Assadi, Samad Akbarzadeh, Safieh Momeni, Sina Dobaradaran, Katayoun Vahdat, Iraj Nabipour
The adipocytokines and insulin-like growth factor 1 (IGF-1) are involved in insulin resistance, the cardiometabolic syndrome, and atherosclerosis. Therefore, investigating the relationship between circulating levels of the novel adipocytokines and IGF-1 is worthwhile. The correlation between IGF-1, visfatin, and omentin-1 has not been adequately investigated. In a population-based study, 324 postmenopausal women were randomly selected. Circulating IGF-1, visfatin, omentin-1, adiponectin, and high-sensitivity C-reactive protein (hs-CRP) levels were measured with the highly specific enzyme-linked immunosorbent assay method...
March 13, 2017: Endocrine Research
https://www.readbyqxmd.com/read/28286551/systems-analysis-of-ethanol-production-in-the-genetically-engineered-cyanobacterium-synechococcus-sp-pcc-7002
#7
Joachim Kopka, Stefanie Schmidt, Frederik Dethloff, Nadin Pade, Susanne Berendt, Marco Schottkowski, Nico Martin, Ulf Dühring, Ekaterina Kuchmina, Heike Enke, Dan Kramer, Annegret Wilde, Martin Hagemann, Alexandra Friedrich
BACKGROUND: Future sustainable energy production can be achieved using mass cultures of photoautotrophic microorganisms, which are engineered to synthesize valuable products directly from CO2 and sunlight. As cyanobacteria can be cultivated in large scale on non-arable land, these phototrophic bacteria have become attractive organisms for production of biofuels. Synechococcus sp. PCC 7002, one of the cyanobacterial model organisms, provides many attractive properties for biofuel production such as tolerance of seawater and high light intensities...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28286506/cyanogen-metabolism-in-cassava-roots-impact-on-protein-synthesis-and-root-development
#8
Tawanda Zidenga, Dimuth Siritunga, Richard T Sayre
Cassava (Manihot esculenta Crantz), a staple crop for millions of sub-Saharan Africans, contains high levels of cyanogenic glycosides which protect it against herbivory. However, cyanogens have also been proposed to play a role in nitrogen transport from leaves to roots. Consistent with this hypothesis, analyses of the distribution and activities of enzymes involved in cyanide metabolism provides evidence for cyanide assimilation, derived from linamarin, into amino acids in cassava roots. Both β-cyanoalanine synthase (CAS) and nitrilase (NIT), two enzymes involved in cyanide assimilation to produce asparagine, were observed to have higher activities in roots compared to leaves, consistent with their proposed role in reduced nitrogen assimilation...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28283651/tfe3-regulates-whole-body-energy-metabolism-in-cooperation-with-tfeb
#9
Nunzia Pastore, Anna Vainshtein, Tiemo J Klisch, Andrea Armani, Tuong Huynh, Niculin J Herz, Elena V Polishchuk, Marco Sandri, Andrea Ballabio
TFE3 and TFEB are members of the MiT family of HLH-leucine zipper transcription factors. Recent studies demonstrated that they bind overlapping sets of promoters and are post-transcriptionally regulated through a similar mechanism. However, while Tcfeb knockout (KO) mice die during early embryonic development, no apparent phenotype was reported in Tfe3 KO mice. Thus raising the need to characterize the physiological role of TFE3 and elucidate its relationship with TFEB TFE3 deficiency resulted in altered mitochondrial morphology and function both in vitro and in vivo due to compromised mitochondrial dynamics...
March 10, 2017: EMBO Molecular Medicine
https://www.readbyqxmd.com/read/28279914/metabolic-divergence-in-simultaneous-biological-removal-of-nitrate-and-sulfide-for-elemental-sulfur-production-under-temperature-stress
#10
Michal Sposob, Rune Bakke, Carlos Dinamarca
The simultaneous removal of NO3(-) and HS(-) at temperature stress (25-10°C) is evaluated here. An expanded granular sludge bed (EGSB) reactor was run over 120days at N/S molar ratio of 0.35 (for S(0) production) under constant sulfur loading rate of 0.4kgS/m(3)d. The simultaneous removal of NO3(-) and HS(-), was achieved at applied conditions. Average HS(-)-S removal varied from 98 (25°C) to 89.2% at 10°C, with almost complete NO3(-) removal. Average S(0) yield ranged from 83.7 at 25°C to 67% at 10°C...
February 28, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28266592/body-mass-index-trajectory-patterns-and-changes-in-visceral-fat-and-glucose-metabolism-before-the-onset-of-type-2-diabetes
#11
Keisuke Kuwahara, Toru Honda, Tohru Nakagawa, Shuichiro Yamamoto, Takeshi Hayashi, Tetsuya Mizoue
We investigated BMI trajectory patterns before diabetes diagnosis and examined associated changes in visceral adiposity and glucose metabolism. 23,978 non-diabetic Japanese participants (2,789 women) aged 30-64 years were assessed with a mean follow-up of 7.6 years. Diabetes was diagnosed via fasting glucose, HbA1c, and self-report. Latent-class trajectory analyses were performed to identify BMI trajectories. Longitudinal changes in BMI, visceral adiposity, and glucose metabolism were estimated using mixed models...
March 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28263995/metabolic-activity-urease-production-antibiotic-resistance-and-virulence-in-dual-species-biofilms-of-staphylococcus-epidermidis-and-staphylococcus-aureus
#12
Ilse Vandecandelaere, Filip Van Nieuwerburgh, Dieter Deforce, Tom Coenye
In this paper, the metabolic activity in single and dual species biofilms of Staphylococcus epidermidis and Staphylococcus aureus isolates was investigated. Our results demonstrated that there was less metabolic activity in dual species biofilms compared to S. aureus biofilms. However, this was not observed if S. aureus and S. epidermidis were obtained from the same sample. The largest effect on metabolic activity was observed in biofilms of S. aureus Mu50 and S. epidermidis ET-024. A transcriptomic analysis of these dual species biofilms showed that urease genes and genes encoding proteins involved in metabolism were downregulated in comparison to monospecies biofilms...
2017: PloS One
https://www.readbyqxmd.com/read/28262328/citrus-flavanones-mildly-interfere-with-pituitary-thyroid-axis-in-old-aged-male-rats
#13
Marko Miler, Ivana Jarić, Jasmina Živanović, Vladimir Ajdžanović, Nasta Tanić, Verica Milošević, Branka Šošić-Jurjević
Citrus flavanones naringenin (NAR) and hesperetin (HES) are potent antioxidants that may contribute to maintenance of health at old age by improving cardiovascular and metabolic status. However, they may also affect thyroid hormone economy. Keeping in mind impaired thyroid function at older age, in this study we tested wheather NAR or HES administration potentiate this decline. NAR or HES were administrated orally (15mg/kg) to male 24-month-old Wistar rats during 4 weeks. Control groups received vehicle, sunflower oil...
March 2, 2017: Acta Histochemica
https://www.readbyqxmd.com/read/28261547/progress-in-prediction-and-interpretation-of-clinically-relevant-metabolic-drug-drug-interactions-a-minireview-illustrating-recent-developments-and-current-opportunities
#14
REVIEW
Stephen Fowler, Peter N Morcos, Yumi Cleary, Meret Martin-Facklam, Neil Parrott, Michael Gertz, Li Yu
PURPOSE OF REVIEW: This review gives a perspective on the current "state of the art" in metabolic drug-drug interaction (DDI) prediction. We highlight areas of successful prediction and illustrate progress in areas where limits in scientific knowledge or technologies prevent us from having full confidence. RECENT FINDINGS: Several examples of success are highlighted. Work done for bitopertin shows how in vitro and clinical data can be integrated to give a model-based understanding of pharmacokinetics and drug interactions...
2017: Current Pharmacology Reports
https://www.readbyqxmd.com/read/28261376/amino-acid-catabolism-in-alzheimer-s-disease-brain-friend-or-foe
#15
REVIEW
Jeddidiah W D Griffin, Patrick C Bradshaw
There is a dire need to discover new targets for Alzheimer's disease (AD) drug development. Decreased neuronal glucose metabolism that occurs in AD brain could play a central role in disease progression. Little is known about the compensatory neuronal changes that occur to attempt to maintain energy homeostasis. In this review using the PubMed literature database, we summarize evidence that amino acid oxidation can temporarily compensate for the decreased glucose metabolism, but eventually altered amino acid and amino acid catabolite levels likely lead to toxicities contributing to AD progression...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28258228/fitness-costs-associated-with-the-acquisition-of-antibiotic-resistance
#16
REVIEW
Sara Hernando-Amado, Fernando Sanz-García, Paula Blanco, José L Martínez
Acquisition of antibiotic resistance is a relevant problem for human health. The selection and spread of antibiotic-resistant organisms not only compromise the treatment of infectious diseases, but also the implementation of different therapeutic procedures as organ transplantation, advanced surgery or chemotherapy, all of which require proficient methods for avoiding infections. It has been generally accepted that the acquisition of antibiotic resistance will produce a general metabolic burden: in the absence of selection, the resistant organisms would be outcompeted by the susceptible ones...
February 28, 2017: Essays in Biochemistry
https://www.readbyqxmd.com/read/28257828/directional-thyroid-hormone-distribution-via-the-blood-stream-to-target-sites
#17
Susanne T Janssen, Onno E Janssen
Thyroid hormones are bound to three major serum transport proteins, thyroxin-binding globulin (TBG), transthyretin (TTR) and human serum albumin (HSA). TBG has the strongest affinity for thyroid hormones, TTR is also found in the cerebrospinal fluid and HSA is the most abundant protein in plasma. Combination defects of either a high affinity TTR or HSA variant do not compensate TBG deficiency, underscoring the dominant role of TBG among the thyroid hormone transport proteins. On the other hand, coexistence of raised affinity TTR and HSA variants causes an augmented hyperthyroxinemia...
February 28, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28257455/the-impact-of-roux-en-y-gastric-bypass-surgery-on-normal-metabolism-in-a-porcine-model
#18
Andreas Lindqvist, Mikael Ekelund, Eliana Garcia-Vaz, Marcus Ståhlman, Stefan Pierzynowski, Maria F Gomez, Jens F Rehfeld, Leif Groop, Jan Hedenbro, Nils Wierup, Peter Spégel
BACKGROUND: A growing body of literature on Roux-en-Y gastric bypass surgery (RYGB) has generated inconclusive results on the mechanism underlying the beneficial effects on weight loss and glycaemia, partially due to the problems of designing clinical studies with the appropriate controls. Moreover, RYGB is only performed in obese individuals, in whom metabolism is perturbed and not completely understood. METHODS: In an attempt to isolate the effects of RYGB and its effects on normal metabolism, we investigated the effect of RYGB in lean pigs, using sham-operated pair-fed pigs as controls...
2017: PloS One
https://www.readbyqxmd.com/read/28251326/the-effect-of-starvation-and-re-feeding-on-vasotocinergic-and-isotocinergic-pathways-in-immature-gilthead-sea-bream-sparus-aurata
#19
Arleta Krystyna Skrzynska, Magdalena Gozdowska, Ewa Kulczykowska, Gonzalo Martínez-Rodríguez, Juan Miguel Mancera, Juan Antonio Martos-Sitcha
This study describes the responses of the vasotocinergic and isotocinergic systems to food deprivation and re-feeding processes in immature gilthead sea bream (Sparus aurata). The animals were subjected to the following experimental treatments: (1) normal feeding (control), (2) food deprivation for 21 days; and (3) re-feeding for 7 days, beginning 14 days after starvation. The animals were sampled at 0, 7, 14 and 21 days from the beginning of the trial. The pituitary and plasma arginine vasotocin (AVT) and isotocin (IT) levels and the hypothalamic pro-vasotocin and pro-isotocin mRNA expression levels were measured...
March 1, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/28241048/targeted-proteome-analysis-of-single-gene-deletion-strains-of-saccharomyces-cerevisiae-lacking-enzymes-in-the-central-carbon-metabolism
#20
Fumio Matsuda, Syohei Kinoshita, Shunsuke Nishino, Atsumi Tomita, Hiroshi Shimizu
Central carbon metabolism is controlled by modulating the protein abundance profiles of enzymes that maintain the essential systems in living organisms. In this study, metabolic adaptation mechanisms in the model organism Saccharomyces cerevisiae were investigated by direct determination of enzyme abundance levels in 30 wild type and mutant strains. We performed a targeted proteome analysis using S. cerevisiae strains that lack genes encoding the enzymes responsible for central carbon metabolism. Our analysis revealed that at least 30% of the observed variations in enzyme abundance levels could be explained by global regulatory mechanisms...
2017: PloS One
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