Metabolomics would like to thank all our referees for their support in 2018
(Source: Metabolomics)
Source: Metabolomics - December 4, 2018 Category: Biology Source Type: research

Insights into gemcitabine resistance and the potential for therapeutic monitoring
ConclusionMetabolic differences between na ïve and resistant pancreatic cancer cells and, accordingly, their unique responses to gemcitabine treatment were revealed, which may be useful in the clinical setting for monitoring a patient’s therapeutic response. (Source: Metabolomics)
Source: Metabolomics - November 27, 2018 Category: Biology Source Type: research

Characterizing alternative feeds for rainbow trout ( O. mykiss ) by 1 H NMR metabolomics
ConclusionThis strategy based on compositional differences between plant-based and alternative feeds can be useful for detecting compounds unsuspected until now that could impact fish metabolism. (Source: Metabolomics)
Source: Metabolomics - November 27, 2018 Category: Biology Source Type: research

Targeted metabolomic profiling of low and high grade serous epithelial ovarian cancer tissues: a pilot study
AbstractIntroductionEpithelial ovarian cancer (EOC) remains the leading cause of death from gynecologic malignancies and has an alarming global fatality rate. Besides the differences in underlying pathogenesis, distinguishing between high grade (HG) and low grade (LG) EOC is imperative for the prediction of disease progression and responsiveness to chemotherapy.ObjectivesThe aim of this study was to investigate, the tissue metabolome associated with HG and LG serous epithelial ovarian cancer.MethodsA combination of one dimensional proton nuclear magnetic resonance (1D H NMR) spectroscopy and targeted mass spectrometry (MS)...
Source: Metabolomics - November 24, 2018 Category: Biology Source Type: research

NS-kNN: a modified k -nearest neighbors approach for imputing metabolomics data
ConclusionAccounting for the nonuniform distribution of missing values in metabolomics data can significantly improve the results of imputation algorithms. The NS-kNN method imputes missing metabolomics data more accurately than existing kNN-based approaches when used on realistic datasets. (Source: Metabolomics)
Source: Metabolomics - November 23, 2018 Category: Biology Source Type: research

Review of recent developments in GC –MS approaches to metabolomics-based research
AbstractBackgroundMetabolomics aims to identify the changes in endogenous metabolites of biological systems in response to intrinsic and extrinsic factors. This is accomplished through untargeted, semi-targeted and targeted based approaches. Untargeted and semi-targeted methods are typically applied in hypothesis-generating investigations (aimed at measuring as many metabolites as possible), while targeted approaches analyze a relatively smaller subset of biochemically important and relevant metabolites. Regardless of approach, it is well recognized amongst the metabolomics community that gas chromatography-mass spectromet...
Source: Metabolomics - November 17, 2018 Category: Biology Source Type: research

Impact of post-collection freezing delay on the reliability of serum metabolomics in samples reflecting the California mid-term pregnancy biobank
ConclusionsDespite extended post-collection freezing delays characteristic of some biobanks of opportunistically collected clinical samples, numerous metabolomic compounds had both stable levels and good concordance. (Source: Metabolomics)
Source: Metabolomics - November 15, 2018 Category: Biology Source Type: research

The altered human serum metabolome induced by a marathon
ConclusionFrom these results it is evident that a marathon places immense strain on the energy-producing pathways of the athlete, leading to extensive protein degradation, oxidative stress, mammalian target of rapamycin complex 1 inhibition and autophagy. A better understanding of this metabolic shift could provide new insights for optimizing athletic performance, developing more efficient nutrition regimens and identify strategies to improve recovery. (Source: Metabolomics)
Source: Metabolomics - November 3, 2018 Category: Biology Source Type: research

Metabolomic biomarkers and novel dietary factors associated with gestational diabetes in China
AbstractIntroductionGestational diabetes mellitus (GDM) is impaired glucose tolerance first recognised during pregnancy; its development is associated with many adverse outcomes. Mechanisms of GDM development are not fully elucidated and few studies have used Chinese participants.ObjectivesThe aim of this study was to investigate the maternal metabolome associated with GDM in a Chinese population, and explore the relationship with maternal diet.MethodsNinety-three participants were recruited at 26 –28 weeks’ gestation from Chongqing, China. Maternal urine, serum, and hair metabolomes were analysed using ga...
Source: Metabolomics - November 3, 2018 Category: Biology Source Type: research

Crop metabolomics: from diagnostics to assisted breeding
We present here a review paper discussing advances in the knowledge reached in the last years derived from the application of metabolomic techniques that evolved from biomarker discovery to improve crop yield and quality.Key Scientific Concepts of ReviewTranslational metabolomics applied to crop breeding programs. (Source: Metabolomics)
Source: Metabolomics - November 3, 2018 Category: Biology Source Type: research

Identification of a select metabolite panel for measuring metabolic perturbation in response to heavy exertion
ConclusionsThese data support that a panel of 26 metabolites can be used to represent global metabolite increases induced by prolonged, intensive exercise. This select panel includes metabolites primarily from the lipid super pathway, and exercise-induced increases are sensitive to the moderating effect of acute carbohydrate ingestion. (Source: Metabolomics)
Source: Metabolomics - November 1, 2018 Category: Biology Source Type: research

Metabolite variation in the lettuce gene pool: towards healthier crop varieties and food
ConclusionOur large-scale analysis of phytochemical variation is unprecedented in lettuce and demonstrated the ample availability of suitable genetic resources for the development of improved lettuce varieties with higher nutritional quality and more sustainable production. (Source: Metabolomics)
Source: Metabolomics - October 29, 2018 Category: Biology Source Type: research

Answering biological questions by analysis of the strawberry metabolome
AbstractBackgroundThe qualitative and quantitative analysis of all low molecular weight metabolites within a biological sample, known as the metabolome, provides powerful insights into their roles in biological systems and processes. The study of all the chemical structures, concentrations, and interactions of the thousands of metabolites is called metabolomics. However present state of the art methods and equipment can only analyse a small portion of the numerous, structurally diverse groups of chemical substances found in biological samples, especially with respect to samples of plant origin with their huge diversity of ...
Source: Metabolomics - October 26, 2018 Category: Biology Source Type: research

Unexpected differential metabolic responses of Campylobacter jejuni to the abundant presence of glutamate and fucose
ConclusionsMoreover, a multitude of not previously annotated metabolites inC. jejuni were found to be increased specifically uponl-fucose addition. These metabolites may well play a role in the pathogenicity of thisC. jejuni strain. (Source: Metabolomics)
Source: Metabolomics - October 23, 2018 Category: Biology Source Type: research

NMR-based metabolomics reveals that plant-derived smoke stimulates root growth via affecting carbohydrate and energy metabolism in maize
AbstractIntroductionIt is well known that plant-derived smoke stimulates seed germination and seedling growth in many plants. Although a number of transcriptomics and proteomics studies have been carried out to understand the mode of action of smoke, less is known about the biochemical alterations associated with smoke exposure in plants.ObjectivesThe aims of this study were (1) to determine the metabolic alterations in maize roots pre-treated with various concentrations of smoke solution, and (2) to identify the smoke-responsive metabolic pathways during early root growth period.MethodsMaize seeds were pre-treated with di...
Source: Metabolomics - October 15, 2018 Category: Biology Source Type: research

Metabolic fingerprinting analysis of oil palm reveals a set of differentially expressed metabolites in fatal yellowing symptomatic and non-symptomatic plants
ConclusionNine metabolites were detected in a higher concentration in non-symptomatic FY plants. Seven are related to stress factors i.e. plant defense and nutrient absorption, which can be affected by the metabolic depression of these compounds. Two of those metabolites (glycerophosphorylcholine and 1,2-dihexanoyl-sn-glycero-3-phosphoethanolamine) are presented as potential biomarkers, since they have no known direct relation to plant stress. (Source: Metabolomics)
Source: Metabolomics - October 11, 2018 Category: Biology Source Type: research

Diagnosis of post-surgical fine-needle aspiration biopsies of thyroid lesions with indeterminate cytology using HRMAS NMR-based metabolomics
ConclusionThese results on model FNAB indicate that there is a clear interest in exploring the possibility to export NMR metabolomics to pre-surgical diagnostics. (Source: Metabolomics)
Source: Metabolomics - October 10, 2018 Category: Biology Source Type: research

Italian cohort of patients affected by inflammatory bowel disease is characterised by variation in glycerophospholipid, free fatty acids and amino acid levels
ConclusionsGiven good statistical results and predictive power of the model produced in our study, metabolomics can be considered as a valid tool to investigate inflammatory bowel disease. (Source: Metabolomics)
Source: Metabolomics - October 10, 2018 Category: Biology Source Type: research

Metabolic diversity in tuber tissues of native Chilo é potatoes and commercial cultivars of Solanum tuberosum ssp. tuberosum L.
ConclusionsAs well as providing important information to potato producers and breeding programs on the levels of health relevant phytochemicals and other abundant metabolites such as starch, proteins and amino acids, this study highlights the associations of different metabolites in tuber skins and pulp, indicating the need for distinct strategies for metabolic engineering in these tissues. Furthermore, this study shows that native Chilean potato accessions have great potential as a natural source of phytochemicals. (Source: Metabolomics)
Source: Metabolomics - October 4, 2018 Category: Biology Source Type: research

Investigation of species and environmental effects on rhubarb roots metabolome using 1 H NMR combined with high performance thin layer chromatography
ConclusionThese results demonstrated the potential of HTPLC as a supporting tool for metabolomics due to its high profiling capacity of targeted metabolic groups and preparative capability. (Source: Metabolomics)
Source: Metabolomics - October 4, 2018 Category: Biology Source Type: research

Global testing of shifts in metabolic phenotype
ConclusionGGT confirmed earlier biological findings in a hypothesis led approach. A main advantage of GGT is that it provides a direct view on involvement of a priori defined pathways in phenotype shifts. (Source: Metabolomics)
Source: Metabolomics - October 4, 2018 Category: Biology Source Type: research

Metabolic diversity in tuber tissues of native Chilo é potatoes and commercial cultivars of Solanum tuberosum ssp. tuberosum L.
ConclusionsAs well as providing important information to potato producers and breeding programs on the levels of health relevant phytochemicals and other abundant metabolites such as starch, proteins and amino acids, this study highlights the associations of different metabolites in tuber skins and pulp, indicating the need for distinct strategies for metabolic engineering in these tissues. Furthermore, this study shows that native Chilean potato accessions have great potential as a natural source of phytochemicals. (Source: Metabolomics)
Source: Metabolomics - October 4, 2018 Category: Biology Source Type: research

Investigation of species and environmental effects on rhubarb roots metabolome using 1 H NMR combined with high performance thin layer chromatography
ConclusionThese results demonstrated the potential of HTPLC as a supporting tool for metabolomics due to its high profiling capacity of targeted metabolic groups and preparative capability. (Source: Metabolomics)
Source: Metabolomics - October 4, 2018 Category: Biology Source Type: research

Global testing of shifts in metabolic phenotype
ConclusionGGT confirmed earlier biological findings in a hypothesis led approach. A main advantage of GGT is that it provides a direct view on involvement of a priori defined pathways in phenotype shifts. (Source: Metabolomics)
Source: Metabolomics - October 4, 2018 Category: Biology Source Type: research

Using urine metabolomics to understand the pathogenesis of infant respiratory syncytial virus (RSV) infection and its role in childhood wheezing
ConclusionThe metabolites associated with infant RSV infection and recurrent-wheezing are indicative of viral takeover of the cellular machinery and resources to enhance virulence, replication, and subversion of the host immune-response, highlighting metabolic pathways important in the pathogenesis of RSV infection and wheeze development. (Source: Metabolomics)
Source: Metabolomics - October 1, 2018 Category: Biology Source Type: research

Mitochondrial aconitase is a key regulator of energy production for growth and protein expression in Chinese hamster ovary cells
ConclusionTransient silencing of mitochondrial aconitase inhibited cell growth, reduced ATP production, increased production of reactive oxygen species and reduced cell specific productivity of a recombinant CHO cell line by at least twofold. (Source: Metabolomics)
Source: Metabolomics - October 1, 2018 Category: Biology Source Type: research

Using urine metabolomics to understand the pathogenesis of infant respiratory syncytial virus (RSV) infection and its role in childhood wheezing
ConclusionThe metabolites associated with infant RSV infection and recurrent-wheezing are indicative of viral takeover of the cellular machinery and resources to enhance virulence, replication, and subversion of the host immune-response, highlighting metabolic pathways important in the pathogenesis of RSV infection and wheeze development. (Source: Metabolomics)
Source: Metabolomics - October 1, 2018 Category: Biology Source Type: research

Mitochondrial aconitase is a key regulator of energy production for growth and protein expression in Chinese hamster ovary cells
ConclusionTransient silencing of mitochondrial aconitase inhibited cell growth, reduced ATP production, increased production of reactive oxygen species and reduced cell specific productivity of a recombinant CHO cell line by at least twofold. (Source: Metabolomics)
Source: Metabolomics - October 1, 2018 Category: Biology Source Type: research

Identifying anti-HSV compounds from unrelated plants using NMR and LC –MS metabolomic analysis
ConclusionMetabolomic analysis on unrelated plants with similar activity can be used to identify the active compound groups or compounds, thereby eliminating the need for screening of plants to determine biological activity, additionally providing information on possible active principles. The two analytical methods identified chlorogenic acids and its building blocks as common and important compounds within plants with anti-HSV activity. Intensified research on plants containing chlorogenic acids should be the focus of future research for development of accessible anti-HSV treatments. (Source: Metabolomics)
Source: Metabolomics - September 28, 2018 Category: Biology Source Type: research

Elevated CO 2 and virus infection impacts wheat and aphid metabolism
ConclusionThis study confirms that virus and eCO2 alter host-plant quality, and these differences are reflected by aphid weight and metabolism. (Source: Metabolomics)
Source: Metabolomics - September 27, 2018 Category: Biology Source Type: research

Metabotyping of 30 maize hybrids under early-sowing conditions reveals potential marker-metabolites for breeding
ConclusionAfter validation in other experiments and larger genotype panels, these marker-metabolites can contribute to breeding. (Source: Metabolomics)
Source: Metabolomics - September 26, 2018 Category: Biology Source Type: research

Lipopolysaccharide (LPS)-induced septic shock causes profound changes in myocardial energy metabolites in pigs
ConclusionsIn pigs, septic shock induced by LPS caused myocardial changes directed to decrease the oxidation of medium- and short-chain fatty acid without an effect on long-chain fatty acid oxidation. The increase in myocardial levels of lactate, alanine, andpyruvate dehydrogenase kinase 4 gene expression suggest that septic shock decreases pyruvate dehydrogenase complex activity and glucose oxidation. Homeostasis of niacin, taurine, glutamate, glutamine, glutathione, hypoxanthine and thromboxane B2 is also affected in the septic myocardium. (Source: Metabolomics)
Source: Metabolomics - September 25, 2018 Category: Biology Source Type: research

Minimal variation of the plasma lipidome after delayed processing of neonatal cord blood
ConclusionDelay in separation of plasma from refrigerated cord blood has minimal effect overall on the plasma lipidome. (Source: Metabolomics)
Source: Metabolomics - September 25, 2018 Category: Biology Source Type: research

Reproducibility of non-fasting plasma metabolomics measurements across processing delays
ConclusionMost metabolites measured by the UPLC –MS/MS platform show acceptable reproducibility up to 48-h processing delays. Metabolites of certain pathways need to be interpreted cautiously in relation to outcomes in epidemiologic studies with prolonged processing delays. (Source: Metabolomics)
Source: Metabolomics - September 25, 2018 Category: Biology Source Type: research

Lipopolysaccharide (LPS)-induced septic shock causes profound changes in myocardial energy metabolites in pigs
ConclusionsIn pigs, septic shock induced by LPS caused myocardial changes directed to decrease the oxidation of medium- and short-chain fatty acid without an effect on long-chain fatty acid oxidation. The increase in myocardial levels of lactate, alanine, andpyruvate dehydrogenase kinase 4 gene expression suggest that septic shock decreases pyruvate dehydrogenase complex activity and glucose oxidation. Homeostasis of niacin, taurine, glutamate, glutamine, glutathione, hypoxanthine and thromboxane B2 is also affected in the septic myocardium. (Source: Metabolomics)
Source: Metabolomics - September 25, 2018 Category: Biology Source Type: research

Minimal variation of the plasma lipidome after delayed processing of neonatal cord blood
ConclusionDelay in separation of plasma from refrigerated cord blood has minimal effect overall on the plasma lipidome. (Source: Metabolomics)
Source: Metabolomics - September 25, 2018 Category: Biology Source Type: research

Reproducibility of non-fasting plasma metabolomics measurements across processing delays
ConclusionMost metabolites measured by the UPLC –MS/MS platform show acceptable reproducibility up to 48-h processing delays. Metabolites of certain pathways need to be interpreted cautiously in relation to outcomes in epidemiologic studies with prolonged processing delays. (Source: Metabolomics)
Source: Metabolomics - September 25, 2018 Category: Biology Source Type: research

Characterization of missing values in untargeted MS-based metabolomics data and evaluation of missing data handling strategies
ConclusionMissing data in untargeted MS-based metabolomics data occur for various reasons. Based on our results, we recommend thatKNN-based imputation is performed on observations with variable pre-selection since it showed robust results in all evaluation schemes. (Source: Metabolomics)
Source: Metabolomics - September 20, 2018 Category: Biology Source Type: research

Integrating transcriptomic techniques and k -means clustering in metabolomics to identify markers of abiotic and biotic stress in Medicago truncatula
ConclusionsProbing metabolomic data with transcriptomic tools provides new insights and could help to identify resilient plant varieties, thereby increasing future crop yield and improving food security. (Source: Metabolomics)
Source: Metabolomics - September 17, 2018 Category: Biology Source Type: research

Lipid phenotyping of lung epithelial lining fluid in healthy human volunteers
ConclusionsWe provide the first evidence that the ELF lipidome varies significantly between healthy individuals and propose that such differences are related to weight status, highlighting the potential impact of (over)nutrition on lung lipid metabolism. (Source: Metabolomics)
Source: Metabolomics - September 17, 2018 Category: Biology Source Type: research

The influence of neuronal electrical activity on the mammalian central clock metabolome
ConclusionOur method has shown to produce reliable and physiologically relevant metabolite data from small brain samples. Inducing electrical activity at night mimics the effect of a light pulses in the SCN, producing phase shifts of the circadian rhythm. The upregulation of metabolites could have a functional role in this process, since they are not solely products of physiological states, they are significant parts of cellular signalling pathways. (Source: Metabolomics)
Source: Metabolomics - September 17, 2018 Category: Biology Source Type: research

New methods to identify high peak density artifacts in Fourier transform mass spectra and to mitigate their effects on high-throughput metabolomic data analysis
ConclusionOur methods robustly identified consistent fuzzy site artifacts in our FT-MS metabolomics spectral data. Without artifact identification and removal, 91.4% classification accuracy was achieved on an example lung cancer dataset; however, these classifiers rely heavily on artifactual features present in fuzzy sites. Proper removal of fuzzy site artifacts produces a more robust classifier based on non-artifactual features, with slightly improved accuracy of 92.4% in our example analysis. (Source: Metabolomics)
Source: Metabolomics - September 17, 2018 Category: Biology Source Type: research

High-resolution mass spectrometry metabolomics of grape chemical markers to reveal use of not-allowed varieties in the production of Amarone and Recioto wines
ConclusionsVarietal markers useful to detect the presence of Primitivo and Negro Amaro in the grape blend were identified by HRMS metabolomics, a method suitable to check the identity of grapes on arrival at the winery, as well as the fermenting musts. The effectiveness of the identified markers in the final wines have to be confirmed. Potentially, a similar approach can be used to reveal analogous frauds performed on other high-quality wines. (Source: Metabolomics)
Source: Metabolomics - September 17, 2018 Category: Biology Source Type: research

Salicylic acid and its derivatives elicit the production of diterpenes and sterols in corals and their algal symbionts: a metabolomics approach to elicitor SAR
ConclusionThese results suggest that SA could function as a general and somewhat selective diterpene inducing signaling molecule in soft corals. Structural consideration reveals initial structure –activity relationship (SAR) in SA derivatives that seem important for efficient diterpene and sterol elicitation. (Source: Metabolomics)
Source: Metabolomics - September 17, 2018 Category: Biology Source Type: research

Integrating transcriptomic techniques and k -means clustering in metabolomics to identify markers of abiotic and biotic stress in Medicago truncatula
ConclusionsProbing metabolomic data with transcriptomic tools provides new insights and could help to identify resilient plant varieties, thereby increasing future crop yield and improving food security. (Source: Metabolomics)
Source: Metabolomics - September 17, 2018 Category: Biology Source Type: research