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Zhou Y, Zhang Y, Jin S, Lv J, Li M, Feng N. The gut microbiota derived metabolite trimethylamine N-oxide: Its important role in cancer and other diseases. Biomed Pharmacother 2024; 177:117031. [PMID: 38925016 DOI: 10.1016/j.biopha.2024.117031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2024] [Revised: 06/21/2024] [Accepted: 06/21/2024] [Indexed: 06/28/2024] Open
Abstract
An expanding body of research indicates a correlation between the gut microbiota and various diseases. Metabolites produced by the gut microbiota act as mediators between the gut microbiota and the host, interacting with multiple systems in the human body to regulate physiological or pathological functions. However, further investigation is still required to elucidate the underlying mechanisms. One such metabolite involved in choline metabolism by gut microbes is trimethylamine (TMA), which can traverse the intestinal epithelial barrier and enter the bloodstream, ultimately reaching the liver where it undergoes oxidation catalyzed by flavin-containing monooxygenase 3 (FMO3) to form trimethylamine N-oxide (TMAO). While some TMAO is eliminated through renal excretion, remaining amounts circulate in the bloodstream, leading to systemic inflammation, endoplasmic reticulum (ER) stress, mitochondrial stress, and disruption of normal physiological functions in humans. As a representative microbial metabolite originating from the gut, TMAO has significant potential both as a biomarker for monitoring disease occurrence and progression and for tailoring personalized treatment strategies for patients. This review provides an extensive overview of TMAO sources and its metabolism in human blood, as well as its impact on several major human diseases. Additionally, we explore the latest research areas related to TMAO along with future directions.
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Affiliation(s)
- Yuhua Zhou
- Wuxi School of Medicine, Jiangnan University, Wuxi, China
| | - Yuwei Zhang
- Nantong University Medical School, Nantong, China
| | - Shengkai Jin
- Wuxi School of Medicine, Jiangnan University, Wuxi, China
| | - Jing Lv
- Wuxi School of Medicine, Jiangnan University, Wuxi, China
| | - Menglu Li
- Department of Urology, Jiangnan University Medical Center, Wuxi, China.
| | - Ninghan Feng
- Wuxi School of Medicine, Jiangnan University, Wuxi, China; Nantong University Medical School, Nantong, China; Department of Urology, Jiangnan University Medical Center, Wuxi, China.
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2
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Li X, Wang C, Yanagita T, Xue C, Zhang T, Wang Y. Trimethylamine N-Oxide in Aquatic Foods. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:14498-14520. [PMID: 38885200 DOI: 10.1021/acs.jafc.4c01974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/20/2024]
Abstract
Trimethylamine N-oxide (TMAO), a characteristic nonprotein nitrogen compound, is widely present in seafood, which exhibits osmoregulatory effects for marine organisms in vivo and plays an important role in aquaculture and aquatic product preservation. However, much attention has been focused on the negative effect of TMAO since it has recently emerged as a putative promoter of chronic diseases. To get full knowledge and maximize our ability to balance the positive and negative aspects of TMAO, in this review, we comprehensively discuss the TMAO in aquatic products from the aspects of physiological functions for marine organisms, flavor, quality, the conversion of precursors, the influences on human health, and the seafood ingredients interaction consideration. Though the circulating TMAO level is inevitably enhanced after seafood consumption, dietary seafood still exhibits beneficial health effects and may provide nutraceuticals to balance the possible adverse effects of TMAO.
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Affiliation(s)
- Xiaoyue Li
- SKL of Marine Food Processing & Safety Control, College of Food Science and Engineering, Ocean University of China, Qingdao 266404, China
| | - Chengcheng Wang
- SKL of Marine Food Processing & Safety Control, College of Food Science and Engineering, Ocean University of China, Qingdao 266404, China
| | - Teruyoshi Yanagita
- Laboratory of Nutrition Biochemistry, Department of Applied Biochemistry and Food Science, Saga University, Saga 840-8502, Japan
| | - Changhu Xue
- SKL of Marine Food Processing & Safety Control, College of Food Science and Engineering, Ocean University of China, Qingdao 266404, China
| | - Tiantian Zhang
- SKL of Marine Food Processing & Safety Control, College of Food Science and Engineering, Ocean University of China, Qingdao 266404, China
| | - Yuming Wang
- SKL of Marine Food Processing & Safety Control, College of Food Science and Engineering, Ocean University of China, Qingdao 266404, China
- Sanya Institute of Oceanography, Ocean University of China, Sanya 572024, China
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3
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Flaherty CC, Phillips IR, Janmohamed A, Shephard EA. Living with trimethylaminuria and body and breath malodour: personal perspectives. BMC Public Health 2024; 24:222. [PMID: 38238734 PMCID: PMC10797923 DOI: 10.1186/s12889-024-17685-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 01/05/2024] [Indexed: 01/22/2024] Open
Abstract
BACKGROUND Many people suffer from body and breath malodour syndromes. One of these is trimethylaminuria, a condition characterized by excretion in breath and bodily fluids of trimethylamine, a volatile and odorous chemical that has the smell of rotting fish. Trimethylaminuria can be primary, due to mutations in the gene encoding flavin-containing monooxygenase 3, or secondary, due to various causes. To gain a better understanding of problems faced by United Kingdom residents affected by body and breath malodour conditions, we conducted a survey. METHODS Two anonymous online surveys, one for adults and one for parents/guardians of affected children, were conducted using the Opinio platform. Participants were invited via a trimethylaminuria advisory website. Questions were a mix of dropdown, checkbox and open-ended responses. Forty-four adults and three parents/guardians participated. The dropdown and checkbox responses were analysed using the Opinio platform. RESULTS All participants reported symptoms of body/breath odour. However, not all answered every question. Twenty-three respondents experienced difficulties in being offered a diagnostic test for trimethylaminuria. Problems encountered included lack of awareness of the disorder by medical professionals and reluctance to recognise symptoms. Of those tested, 52% were diagnosed with trimethylaminuria. The main problems associated with living with body/breath malodours were bullying, harassment and ostracism in either the workplace (90%) or in social settings (88%). All respondents thought their condition had disadvantaged them in their daily lives. Open-ended responses included loss of confidence, stress, exclusion, isolation, loneliness, depression and suicidal thoughts. Respondents thought their lives could be improved by greater awareness and understanding of malodour conditions by medical professionals, employers and the general public, and appreciation that the malodour was due to a medical condition and not their fault. CONCLUSIONS Breath and body malodour conditions can cause immense hardship and distress, both mentally and socially, having devastating effects on quality of life. It would be advantageous to establish a standardised pathway from primary care to a specialist unit with access to a robust and reliable test and diagnostic criteria. There is a need to recognise malodour disorders as a disability, giving affected individuals the same rights as those with currently recognised disabilities.
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Affiliation(s)
| | - Ian R Phillips
- Department of Structural and Molecular Biology, University College London, London, UK
- School of Biological and Behavioural Sciences, Queen Mary University of London, London, UK
| | - Azara Janmohamed
- Department of Clinical Pharmacology, St. Mary's Hospital, Imperial College Healthcare NHS Trust, London, UK
| | - Elizabeth A Shephard
- Department of Structural and Molecular Biology, University College London, London, UK.
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4
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Microbial-derived metabolites as a risk factor of age-related cognitive decline and dementia. Mol Neurodegener 2022; 17:43. [PMID: 35715821 PMCID: PMC9204954 DOI: 10.1186/s13024-022-00548-6] [Citation(s) in RCA: 66] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Accepted: 05/30/2022] [Indexed: 02/06/2023] Open
Abstract
A consequence of our progressively ageing global population is the increasing prevalence of worldwide age-related cognitive decline and dementia. In the absence of effective therapeutic interventions, identifying risk factors associated with cognitive decline becomes increasingly vital. Novel perspectives suggest that a dynamic bidirectional communication system between the gut, its microbiome, and the central nervous system, commonly referred to as the microbiota-gut-brain axis, may be a contributing factor for cognitive health and disease. However, the exact mechanisms remain undefined. Microbial-derived metabolites produced in the gut can cross the intestinal epithelial barrier, enter systemic circulation and trigger physiological responses both directly and indirectly affecting the central nervous system and its functions. Dysregulation of this system (i.e., dysbiosis) can modulate cytotoxic metabolite production, promote neuroinflammation and negatively impact cognition. In this review, we explore critical connections between microbial-derived metabolites (secondary bile acids, trimethylamine-N-oxide (TMAO), tryptophan derivatives and others) and their influence upon cognitive function and neurodegenerative disorders, with a particular interest in their less-explored role as risk factors of cognitive decline.
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5
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Bekhit AEDA, Giteru SG, Holman BWB, Hopkins DL. Total volatile basic nitrogen and trimethylamine in muscle foods: Potential formation pathways and effects on human health. Compr Rev Food Sci Food Saf 2021; 20:3620-3666. [PMID: 34056832 DOI: 10.1111/1541-4337.12764] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 03/30/2021] [Accepted: 04/02/2021] [Indexed: 12/18/2022]
Abstract
The use of total volatile basic nitrogen (TVB-N) as a quality parameter for fish is rapidly growing to include other types of meat. Investigations of meat quality have recently focused on TVB-N as an index of freshness, but little is known on the biochemical pathways involved in its generation. Furthermore, TVB-N and methylated amines have been reported to exert deterimental health effects, but the relationship between these compounds and human health has not been critically reviewed. Here, literature on the formative pathways of TVB-N has been reviewed in depth. The association of methylated amines and human health has been critically evaluated. Interventions to mitigate the effects of TVB-N on human health are discussed. TVB-N levels in meat can be influenced by the diet of an animal, which calls for careful consideration when using TVB-N thresholds for regulatory purposes. Bacterial contamination and temperature abuse contribute to significant levels of post-mortem TVB-N increases. Therefore, controlling spoilage factors through a good level of hygiene during processing and preservation techniques may contribute to a substantial reduction of TVB-N. Trimethylamine (TMA) constitutes a significant part of TVB-N. TMA and trimethylamine oxide (TMA-N-O) have been related to the pathogenesis of noncommunicable diseases, including atherosclerosis, cancers, and diabetes. Proposed methods for mitigation of TMA and TMA-N-O accumulation are discussed, which include a reduction in their daily dietary intake, control of internal production pathways by targeting gut microbiota, and inhibition of flavin monooxygenase 3 enzymes. The levels of TMA and TMA-N-O have significant health effects, and this should, therefore, be considered when evaluating meat quality and acceptability. Agreed international values for TVB-N and TMA in meat products are required. The role of feed, gut microbiota, and translocation of methylated amines to muscles in farmed animals requires further investigation.
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Affiliation(s)
| | - Stephen G Giteru
- Department of Food Science, University of Otago, Dunedin, New Zealand.,Food & Bio-based Products, AgResearch Limited, Tennent Drive, Palmerston North, 4410, New Zealand
| | - Benjamin W B Holman
- Centre for Red Meat and Sheep Development, NSW Department of Primary Industries, Cowra, New South Wales, Australia
| | - David L Hopkins
- Centre for Red Meat and Sheep Development, NSW Department of Primary Industries, Cowra, New South Wales, Australia
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6
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Iglesias-Carres L, Hughes MD, Steele CN, Ponder MA, Davy KP, Neilson AP. Use of dietary phytochemicals for inhibition of trimethylamine N-oxide formation. J Nutr Biochem 2021; 91:108600. [PMID: 33577949 DOI: 10.1016/j.jnutbio.2021.108600] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 12/01/2020] [Accepted: 12/30/2020] [Indexed: 12/12/2022]
Abstract
Trimethylamine-N-oxide (TMAO) has been reported as a risk factor for atherosclerosis development, as well as for other cardiovascular disease (CVD) pathologies. The objective of this review is to provide a useful summary on the use of phytochemicals as TMAO-reducing agents. This review discusses the main mechanisms by which TMAO promotes CVD, including the modulation of lipid and bile acid metabolism, and the promotion of endothelial dysfunction and oxidative stress. Current knowledge on the available strategies to reduce TMAO formation are discussed, highlighting the effect and potential of phytochemicals. Overall, phytochemicals (i.e., phenolic compounds or glucosinolates) reduce TMAO formation by modulating gut microbiota composition and/or function, inhibiting host's capacity to metabolize TMA to TMAO, or a combination of both. Perspectives for design of future studies involving phytochemicals as TMAO-reducing agents are discussed. Overall, the information provided by this review outlines the current state of the art of the role of phytochemicals as TMAO reducing agents, providing valuable insight to further advance in this field of study.
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Affiliation(s)
- Lisard Iglesias-Carres
- Department of Food, Bioprocessing and Nutrition Sciences, Plants for Human Health Institute, North Carolina State University, Kannapolis, NC
| | - Michael D Hughes
- Department of Food Science and Technology, Virginia Polytechnic Institute and State University, Blacksburg, VA
| | - Cortney N Steele
- Department of Human Nutrition, Foods and Exercise, Virginia Polytechnic Institute and State University, Blacksburg, VA
| | - Monica A Ponder
- Department of Food Science and Technology, Virginia Polytechnic Institute and State University, Blacksburg, VA
| | - Kevin P Davy
- Department of Human Nutrition, Foods and Exercise, Virginia Polytechnic Institute and State University, Blacksburg, VA
| | - Andrew P Neilson
- Department of Food, Bioprocessing and Nutrition Sciences, Plants for Human Health Institute, North Carolina State University, Kannapolis, NC.
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Lindqvist HM, Rådjursöga M, Malmodin D, Winkvist A, Ellegård L. Serum metabolite profiles of habitual diet: evaluation by 1H-nuclear magnetic resonance analysis. Am J Clin Nutr 2019; 110:53-62. [PMID: 31127814 PMCID: PMC6885523 DOI: 10.1093/ajcn/nqz032] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Accepted: 02/12/2019] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Objective and reliable methods to measure dietary exposure and prove associations and causation between diet and health are desirable. OBJECTIVE The aim of this study was to investigate if 1H-nuclear magnetic resonance (1H-NMR) analysis of serum samples may be used as an objective method to discriminate vegan, vegetarian, and omnivore diets. Specifically, the aim was to identify a metabolite pattern that separated meat-eaters from non-meat-eaters and vegans from nonvegans. METHODS Healthy volunteers (45 men and 75 women) complying with habitual vegan (n = 43), vegetarian (n = 24 + vegetarians adding fish n = 13), or omnivore (n = 40) diets were enrolled in the study. Data were collected on clinical phenotype, body composition, lifestyle including a food-frequency questionnaire (FFQ), and a 4-d weighed food diary. Serum samples were analyzed by routine clinical test and for metabolites by 1H-NMR spectroscopy. NMR data were nonnormalized, UV-scaled, and analyzed with multivariate data analysis [principal component analysis, orthogonal projections to latent structures (OPLS) and OPLS with discriminant analysis]. In the multivariate analysis volunteers were assigned as meat-eaters (omnivores), non-meat-eaters (vegans and vegetarians), vegans, or nonvegans (lacto-ovo-vegetarians, vegetarians adding fish, and omnivores). Metabolites were identified by line-fitting of 1D 1H-NMR spectra and the use of statistical total correlation spectroscopy. RESULTS Although many metabolites differ in concentration between men and women as well as by age, body mass index, and body composition, it was possible to correctly classify 97.5% of the meat-eaters compared with non-meat-eaters and 92.5% of the vegans compared with nonvegans. The branched-chain amino acids, creatine, lysine, 2-aminobutyrate, glutamine, glycine, trimethylamine, and 1 unidentified metabolite were among the most important metabolites in the discriminating patterns in relation to intake of both meat and other animal products. CONCLUSIONS 1H-NMR serum metabolomics appears to be a possible objective tool to identify and predict habitual intake of meat and other animal products in healthy subjects. These results should be confirmed in larger cohort studies or intervention trials. This trial was registered at clinicaltrials.gov as NCT02039609.
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Affiliation(s)
- Helen M Lindqvist
- Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy,Address correspondence to HML (e-mail: )
| | - Millie Rådjursöga
- Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy,Swedish NMR Centre, University of Gothenburg, Gothenburg, Sweden
| | - Daniel Malmodin
- Swedish NMR Centre, University of Gothenburg, Gothenburg, Sweden
| | - Anna Winkvist
- Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy
| | - Lars Ellegård
- Clinical Nutrition Unit, Department of Gastroenterology, Sahlgrenska University Hospital, Gothenburg, Sweden
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8
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Rådjursöga M, Lindqvist HM, Pedersen A, Karlsson GB, Malmodin D, Brunius C, Ellegård L, Winkvist A. The 1H NMR serum metabolomics response to a two meal challenge: a cross-over dietary intervention study in healthy human volunteers. Nutr J 2019; 18:25. [PMID: 30961592 PMCID: PMC6454665 DOI: 10.1186/s12937-019-0446-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 03/21/2019] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND Metabolomics represents a powerful tool for exploring modulation of the human metabolome in response to food intake. However, the choice of multivariate statistical approach is not always evident, especially for complex experimental designs with repeated measurements per individual. Here we have investigated the serum metabolic responses to two breakfast meals: an egg and ham based breakfast and a cereal based breakfast using three different multivariate approaches based on the Projections to Latent Structures framework. METHODS In a cross over design, 24 healthy volunteers ate the egg and ham breakfast and cereal breakfast on four occasions each. Postprandial serum samples were subjected to metabolite profiling using 1H nuclear magnetic resonance spectroscopy and metabolites were identified using 2D nuclear magnetic resonance spectroscopy. Metabolic profiles were analyzed using Orthogonal Projections to Latent Structures with Discriminant Analysis and Effect Projections and ANOVA-decomposed Projections to Latent Structures. RESULTS The Orthogonal Projections to Latent Structures with Discriminant Analysis model correctly classified 92 and 90% of the samples from the cereal breakfast and egg and ham breakfast, respectively, but confounded dietary effects with inter-personal variability. Orthogonal Projections to Latent Structures with Effect Projections removed inter-personal variability and performed perfect classification between breakfasts, however at the expense of comparing means of respective breakfasts instead of all samples. ANOVA-decomposed Projections to Latent Structures managed to remove inter-personal variability and predicted 99% of all individual samples correctly. Proline, tyrosine, and N-acetylated amino acids were found in higher concentration after consumption of the cereal breakfast while creatine, methanol, and isoleucine were found in higher concentration after the egg and ham breakfast. CONCLUSIONS Our results demonstrate that the choice of statistical method will influence the results and adequate methods need to be employed to manage sample dependency and repeated measurements in cross-over studies. In addition, 1H nuclear magnetic resonance serum metabolomics could reproducibly characterize postprandial metabolic profiles and identify discriminatory metabolites largely reflecting dietary composition. TRIAL REGISTRATION Registered with ClinicalTrials.gov, identifier: NCT02039596 . Date of registration: January 17, 2014.
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Affiliation(s)
| | - Helen M Lindqvist
- Department of Internal Medicine and Clinical Nutrition, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Anders Pedersen
- Swedish NMR Centre, University of Gothenburg, Gothenburg, Sweden
| | - Göran B Karlsson
- Swedish NMR Centre, University of Gothenburg, Gothenburg, Sweden
| | - Daniel Malmodin
- Swedish NMR Centre, University of Gothenburg, Gothenburg, Sweden
| | - Carl Brunius
- Department of Biology and Biological Engineering Food and Nutrition Science Chalmers University of Technology, Gothenburg, Sweden
| | - Lars Ellegård
- Department of Internal Medicine and Clinical Nutrition, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Anna Winkvist
- Department of Internal Medicine and Clinical Nutrition, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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Prediction of in situ metabolism of photobacteria in modified atmosphere packaged poultry meat using metatranscriptomic data. Microbiol Res 2019; 222:52-59. [PMID: 30928030 DOI: 10.1016/j.micres.2019.03.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 02/22/2019] [Accepted: 03/07/2019] [Indexed: 11/22/2022]
Abstract
Modified atmosphere packaging (MAP) is widely used in food industry to extend the microbiological shelf life of meat. Common CO2-containing gas atmospheres for poultry meat packaging are either nearly O2-free or high O2 MAPs. In this work, we compared spoilage microbiota of skinless chicken breast in CO2/O2 (30/70%) and CO2/N2 (30/70%) MAP, which are culturable with conventional methods and identified isolates by MALDI-TOF MS. These data were compared to metatranscriptome sequencing enabling a culture-independent overview on the composition of microbiota at species level. While typical MAP meat spoilers were confirmed in the transcriptomic approach, we also found high numbers of transcripts mapping to Photobacterium spp. sequences in these samples. As photobacteria were recently shown to occur in different MAP and vacuum packaged meats, we used the respective part of the metatranscriptomic data for prediction of Photobacterium spp. major metabolic routes in situ, upon growth in MAP poultry meat. It is predicted that they employ similar metabolism in both atmospheres: In the lack of carbohydrates upon meat spoilage, the pyruvate pool is filled via glycerol originating from lipolysis and amino acid conversions. From the pyruvate pool, gluconeogenesis is fed enabling cell wall biosynthesis and growth as well as catabolism to lactate and other metabolites, or anaplerosis towards the citric acid cycle. Production is predicted of several biogenic amines including tyramine and cadaverine, enabling generation of proton motive force. Taken together, photobacteria express metabolic pathways upon growth on meat, which should lead to compounds overlapping with those of known potent meat spoilers.
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10
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Subramaniam S, Fletcher C. Trimethylamine N-oxide: breathe new life. Br J Pharmacol 2018; 175:1344-1353. [PMID: 28745401 PMCID: PMC5866995 DOI: 10.1111/bph.13959] [Citation(s) in RCA: 95] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 06/19/2017] [Accepted: 07/03/2017] [Indexed: 01/14/2023] Open
Abstract
Association between elevated levels of systemic trimethylamine N-oxide (TMAO) and increased risk for adverse cardiovascular events have been proposed in recent years. Increasing experimental and clinical evidence in the last decade has implicated TMAO as an important contributor to the pathogenesis of cardiovascular diseases. TMAO, the oxygenated product of trimethylamine (TMA), belongs to the class of amine oxides. Most of the TMA derived from the metabolism of choline and L-carnitine by gut bacteria is absorbed into the bloodstream and gets rapidly oxidized to TMAO by the hepatic enzyme, flavin-containing monooxgenase-3. Here, we discussed the biosynthesis of TMAO and clinical studies that have assessed TMAO as a biomarker for various cardiovascular and other diseases such as kidney failure, thrombosis, atherosclerosis, obesity, diabetes and cancer. We also summarized the interaction of TMAO with synthetic and traditional molecules that together affect circulating TMAO levels. LINKED ARTICLES This article is part of a themed section on Spotlight on Small Molecules in Cardiovascular Diseases. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v175.8/issuetoc.
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Affiliation(s)
- Saravanan Subramaniam
- Department of Pathology and Laboratory MedicineUniversity of North Carolina at Chapel HillChapel HillNCUSA
- Department of Medicine, Division of Hematology/Oncology, McAllister Heart InstituteUniversity of North Carolina at Chapel HillChapel HillNCUSA
| | - Craig Fletcher
- Department of Pathology and Laboratory MedicineUniversity of North Carolina at Chapel HillChapel HillNCUSA
- Department of Medicine, Division of Hematology/Oncology, McAllister Heart InstituteUniversity of North Carolina at Chapel HillChapel HillNCUSA
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11
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Carey JN, Mettert EL, Roggiani M, Myers KS, Kiley PJ, Goulian M. Regulated Stochasticity in a Bacterial Signaling Network Permits Tolerance to a Rapid Environmental Change. Cell 2018; 173:196-207.e14. [PMID: 29502970 DOI: 10.1016/j.cell.2018.02.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 12/01/2017] [Accepted: 02/01/2018] [Indexed: 12/25/2022]
Abstract
Microbial populations can maximize fitness in dynamic environments through bet hedging, a process wherein a subpopulation assumes a phenotype not optimally adapted to the present environment but well adapted to an environment likely to be encountered. Here, we show that oxygen induces fluctuating expression of the trimethylamine oxide (TMAO) respiratory system of Escherichia coli, diversifying the cell population and enabling a bet-hedging strategy that permits growth following oxygen loss. This regulation by oxygen affects the variance in gene expression but leaves the mean unchanged. We show that the oxygen-sensitive transcription factor IscR is the key regulator of variability. Oxygen causes IscR to repress expression of a TMAO-responsive signaling system, allowing stochastic effects to have a strong effect on the output of the system and resulting in heterogeneous expression of the TMAO reduction machinery. This work reveals a mechanism through which cells regulate molecular noise to enhance fitness.
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Affiliation(s)
- Jeffrey N Carey
- Graduate Group in Biochemistry and Molecular Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Erin L Mettert
- Department of Biomolecular Chemistry, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Manuela Roggiani
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Kevin S Myers
- Department of Biomolecular Chemistry, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Patricia J Kiley
- Department of Biomolecular Chemistry, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Mark Goulian
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Physics & Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA.
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12
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Veeravalli S, Karu K, Scott F, Fennema D, Phillips IR, Shephard EA. Effect of Flavin-Containing Monooxygenase Genotype, Mouse Strain, and Gender on Trimethylamine N-oxide Production, Plasma Cholesterol Concentration, and an Index of Atherosclerosis. Drug Metab Dispos 2017; 46:20-25. [PMID: 29070510 PMCID: PMC5733448 DOI: 10.1124/dmd.117.077636] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Accepted: 10/19/2017] [Indexed: 11/22/2022] Open
Abstract
The objectives of the study were to determine the contribution, in mice, of members of the flavin-containing monooxygenase (FMO) family to the production of trimethylamine (TMA) N-oxide (TMAO), a potential proatherogenic molecule, and whether under normal dietary conditions differences in TMAO production were associated with changes in plasma cholesterol concentration or with an index of atherosclerosis (Als). Concentrations of urinary TMA and TMAO and plasma cholesterol were measured in 10-week-old male and female C57BL/6J and CD-1 mice and in mouse lines deficient in various Fmo genes (Fmo1−/−, 2−/−, 4−/−, and Fmo5−/−). In female mice most TMA N-oxygenation was catalyzed by FMO3, but in both genders 11%–12% of TMA was converted to TMAO by FMO1. Gender-, Fmo genotype-, and strain-related differences in TMAO production were accompanied by opposite effects on plasma cholesterol concentration. Plasma cholesterol was negatively, but weakly, correlated with TMAO production and urinary TMAO concentration. Fmo genotype had no effect on Als. There was no correlation between Als and either TMAO production or urinary TMAO concentration. Our results indicate that under normal dietary conditions TMAO does not increase plasma cholesterol or act as a proatherogenic molecule.
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Affiliation(s)
- Sunil Veeravalli
- Institute of Structural and Molecular Biology (S.V., F.S., D.F., I.R.P., E.A.S.) and Mass Spectrometry Facility, Department of Chemistry (K.K.), University College London, London, United Kingdom; and School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom (I.R.P.)
| | - Kersti Karu
- Institute of Structural and Molecular Biology (S.V., F.S., D.F., I.R.P., E.A.S.) and Mass Spectrometry Facility, Department of Chemistry (K.K.), University College London, London, United Kingdom; and School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom (I.R.P.)
| | - Flora Scott
- Institute of Structural and Molecular Biology (S.V., F.S., D.F., I.R.P., E.A.S.) and Mass Spectrometry Facility, Department of Chemistry (K.K.), University College London, London, United Kingdom; and School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom (I.R.P.)
| | - Diede Fennema
- Institute of Structural and Molecular Biology (S.V., F.S., D.F., I.R.P., E.A.S.) and Mass Spectrometry Facility, Department of Chemistry (K.K.), University College London, London, United Kingdom; and School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom (I.R.P.)
| | - Ian R Phillips
- Institute of Structural and Molecular Biology (S.V., F.S., D.F., I.R.P., E.A.S.) and Mass Spectrometry Facility, Department of Chemistry (K.K.), University College London, London, United Kingdom; and School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom (I.R.P.)
| | - Elizabeth A Shephard
- Institute of Structural and Molecular Biology (S.V., F.S., D.F., I.R.P., E.A.S.) and Mass Spectrometry Facility, Department of Chemistry (K.K.), University College London, London, United Kingdom; and School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom (I.R.P.)
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Veeravalli S, Karu K, Phillips IR, Shephard EA. A highly sensitive liquid chromatography electrospray ionization mass spectrometry method for quantification of TMA, TMAO and creatinine in mouse urine. MethodsX 2017; 4:310-319. [PMID: 29062719 PMCID: PMC5643081 DOI: 10.1016/j.mex.2017.09.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 09/18/2017] [Indexed: 01/01/2023] Open
Abstract
Our method describes the quantification in mouse urine of trimethylamine (TMA), trimethylamine N-oxide (TMAO) and creatinine. The method combines derivatization of TMA, with ethyl bromoacetate, and LC chromatographic separation on an ACE C18 column. The effluent was continuously electrosprayed into the linear ion trap mass spectrometer (LTQ), which operated in selective ion monitoring (SIM) modes set for targeted analytes and their internal standards (IS). All validation parameters were within acceptable ranges of analytical method validation guidelines. Intra- and inter-day assay precision and accuracy coefficients of variation were <3.1%, and recoveries for TMA and TMAO were 97–104%. The method developed uses a two-step procedure. Firstly, TMA and TMAO are analyzed without a purification step using a 5-min gradient cap-LC- SIMs analysis, then creatinine is analyzed using the same experimental conditions. The method is robust, highly sensitive, reproducible and has the high-throughput capability of detecting TMA, TMAO and creatinine at on-column concentrations as low as 28 pg/mL, 115 pg/mL and 1 ng/mL, respectively. The method is suitable for analysis of TMA, TMAO and creatinine in both male and female mouse urine. The key benefits of the method are: The small sample volume of urine required, which overcomes the difficulties of collecting sufficient volumes of urine at defined times. No sample pre-treatment is necessary. The quantification of TMA, TMAO and creatinine using the same cap-LC-MS method.
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Affiliation(s)
- Sunil Veeravalli
- Institute of Structural and Molecular Biology, University College London, London, UK
| | - Kersti Karu
- Mass Spectrometry Facility, Department of Chemistry, University College London, London, UK
| | - Ian R Phillips
- Institute of Structural and Molecular Biology, University College London, London, UK.,School of Biological and Chemical Sciences, Queen Mary University of London, London, UK
| | - Elizabeth A Shephard
- Institute of Structural and Molecular Biology, University College London, London, UK
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Kelly TN, Bazzano LA, Ajami NJ, He H, Zhao J, Petrosino JF, Correa A, He J. Gut Microbiome Associates With Lifetime Cardiovascular Disease Risk Profile Among Bogalusa Heart Study Participants. Circ Res 2016; 119:956-64. [PMID: 27507222 DOI: 10.1161/circresaha.116.309219] [Citation(s) in RCA: 233] [Impact Index Per Article: 29.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 08/09/2016] [Indexed: 12/25/2022]
Abstract
RATIONALE Few studies have systematically assessed the influence of gut microbiota on cardiovascular disease (CVD) risk. OBJECTIVE To examine the association between gut microbiota and lifetime CVD risk profile among 55 Bogalusa Heart Study participants with the highest and 57 with the lowest lifetime burdens of CVD risk factors. METHODS AND RESULTS 16S ribosomal RNA sequencing was conducted on microbial DNA extracted from stool samples of the Bogalusa Heart Study participants. α Diversity, including measures of richness and evenness, and individual genera were tested for associations with lifetime CVD risk profile. Multivariable regression techniques were used to adjust for age, sex, and race (model 1), along with body mass index (model 2) and both body mass index and diet (model 3). In model 1, odds ratios (95% confidence intervals) for each SD increase in richness, measured by the number of observed operational taxonomic units, Chao 1 index, and abundance-based coverage estimator, were 0.62 (0.39-0.99), 0.61 (0.38-0.98), and 0.63 (0.39-0.99), respectively. Associations were consistent in models 2 and 3. Four genera were enriched among those with high versus low CVD risk profile in all models. Model 1 P values were 2.12×10(-3), 7.95×10(-5), 4.39×10(-4), and 1.51×10(-4) for Prevotella 2, Prevotella 7, Tyzzerella, and Tyzzerella 4, respectively. Two genera were depleted among those with high versus low CVD risk profile in all models. Model 1 P values were 2.96×10(-6) and 1.82×10(-4) for Alloprevotella and Catenibacterium, respectively. CONCLUSIONS The current study identified associations of overall microbial richness and 6 microbial genera with lifetime CVD risk.
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Affiliation(s)
- Tanika N Kelly
- From the Department of Epidemiology, School of Public Health and Tropical Medicine (T.N.K., L.A.B., H.H., J.Z., J.H.) and Department of Medicine, School of Medicine (L.A.B., J.H.), Tulane University, New Orleans, LA; The Alkek Center for Metagenomics and Microbiome Research, Baylor College of Medicine, Houston, TX (N.J.A., J.F.P.); and Department of Pediatrics & Medicine, University of Mississippi Medical Center, Jackson, MS (A.C.).
| | - Lydia A Bazzano
- From the Department of Epidemiology, School of Public Health and Tropical Medicine (T.N.K., L.A.B., H.H., J.Z., J.H.) and Department of Medicine, School of Medicine (L.A.B., J.H.), Tulane University, New Orleans, LA; The Alkek Center for Metagenomics and Microbiome Research, Baylor College of Medicine, Houston, TX (N.J.A., J.F.P.); and Department of Pediatrics & Medicine, University of Mississippi Medical Center, Jackson, MS (A.C.)
| | - Nadim J Ajami
- From the Department of Epidemiology, School of Public Health and Tropical Medicine (T.N.K., L.A.B., H.H., J.Z., J.H.) and Department of Medicine, School of Medicine (L.A.B., J.H.), Tulane University, New Orleans, LA; The Alkek Center for Metagenomics and Microbiome Research, Baylor College of Medicine, Houston, TX (N.J.A., J.F.P.); and Department of Pediatrics & Medicine, University of Mississippi Medical Center, Jackson, MS (A.C.)
| | - Hua He
- From the Department of Epidemiology, School of Public Health and Tropical Medicine (T.N.K., L.A.B., H.H., J.Z., J.H.) and Department of Medicine, School of Medicine (L.A.B., J.H.), Tulane University, New Orleans, LA; The Alkek Center for Metagenomics and Microbiome Research, Baylor College of Medicine, Houston, TX (N.J.A., J.F.P.); and Department of Pediatrics & Medicine, University of Mississippi Medical Center, Jackson, MS (A.C.)
| | - Jinying Zhao
- From the Department of Epidemiology, School of Public Health and Tropical Medicine (T.N.K., L.A.B., H.H., J.Z., J.H.) and Department of Medicine, School of Medicine (L.A.B., J.H.), Tulane University, New Orleans, LA; The Alkek Center for Metagenomics and Microbiome Research, Baylor College of Medicine, Houston, TX (N.J.A., J.F.P.); and Department of Pediatrics & Medicine, University of Mississippi Medical Center, Jackson, MS (A.C.)
| | - Joseph F Petrosino
- From the Department of Epidemiology, School of Public Health and Tropical Medicine (T.N.K., L.A.B., H.H., J.Z., J.H.) and Department of Medicine, School of Medicine (L.A.B., J.H.), Tulane University, New Orleans, LA; The Alkek Center for Metagenomics and Microbiome Research, Baylor College of Medicine, Houston, TX (N.J.A., J.F.P.); and Department of Pediatrics & Medicine, University of Mississippi Medical Center, Jackson, MS (A.C.)
| | - Adolfo Correa
- From the Department of Epidemiology, School of Public Health and Tropical Medicine (T.N.K., L.A.B., H.H., J.Z., J.H.) and Department of Medicine, School of Medicine (L.A.B., J.H.), Tulane University, New Orleans, LA; The Alkek Center for Metagenomics and Microbiome Research, Baylor College of Medicine, Houston, TX (N.J.A., J.F.P.); and Department of Pediatrics & Medicine, University of Mississippi Medical Center, Jackson, MS (A.C.)
| | - Jiang He
- From the Department of Epidemiology, School of Public Health and Tropical Medicine (T.N.K., L.A.B., H.H., J.Z., J.H.) and Department of Medicine, School of Medicine (L.A.B., J.H.), Tulane University, New Orleans, LA; The Alkek Center for Metagenomics and Microbiome Research, Baylor College of Medicine, Houston, TX (N.J.A., J.F.P.); and Department of Pediatrics & Medicine, University of Mississippi Medical Center, Jackson, MS (A.C.)
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Fennema D, Phillips IR, Shephard EA. Trimethylamine and Trimethylamine N-Oxide, a Flavin-Containing Monooxygenase 3 (FMO3)-Mediated Host-Microbiome Metabolic Axis Implicated in Health and Disease. ACTA ACUST UNITED AC 2016; 44:1839-1850. [PMID: 27190056 PMCID: PMC5074467 DOI: 10.1124/dmd.116.070615] [Citation(s) in RCA: 230] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 05/13/2016] [Indexed: 02/06/2023]
Abstract
Flavin-containing monooxygenase 3 (FMO3) is known primarily as an enzyme involved in the metabolism of therapeutic drugs. On a daily basis, however, we are exposed to one of the most abundant substrates of the enzyme trimethylamine (TMA), which is released from various dietary components by the action of gut bacteria. FMO3 converts the odorous TMA to nonodorous TMA N-oxide (TMAO), which is excreted in urine. Impaired FMO3 activity gives rise to the inherited disorder primary trimethylaminuria (TMAU). Affected individuals cannot produce TMAO and, consequently, excrete large amounts of TMA. A dysbiosis in gut bacteria can give rise to secondary TMAU. Recently, there has been much interest in FMO3 and its catalytic product, TMAO, because TMAO has been implicated in various conditions affecting health, including cardiovascular disease, reverse cholesterol transport, and glucose and lipid homeostasis. In this review, we consider the dietary components that can give rise to TMA, the gut bacteria involved in the production of TMA from dietary precursors, the metabolic reactions by which bacteria produce and use TMA, and the enzymes that catalyze the reactions. Also included is information on bacteria that produce TMA in the oral cavity and vagina, two key microbiome niches that can influence health. Finally, we discuss the importance of the TMA/TMAO microbiome-host axis in health and disease, considering factors that affect bacterial production and host metabolism of TMA, the involvement of TMAO and FMO3 in disease, and the implications of the host-microbiome axis for management of TMAU.
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Affiliation(s)
- Diede Fennema
- Institute of Structural and Molecular Biology, University College London (D.F., I.R.P., E.A.S.), and School of Biological and Chemical Sciences, Queen Mary University of London (I.R.P.), London, United Kingdom
| | - Ian R Phillips
- Institute of Structural and Molecular Biology, University College London (D.F., I.R.P., E.A.S.), and School of Biological and Chemical Sciences, Queen Mary University of London (I.R.P.), London, United Kingdom
| | - Elizabeth A Shephard
- Institute of Structural and Molecular Biology, University College London (D.F., I.R.P., E.A.S.), and School of Biological and Chemical Sciences, Queen Mary University of London (I.R.P.), London, United Kingdom
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Org E, Mehrabian M, Lusis AJ. Unraveling the environmental and genetic interactions in atherosclerosis: Central role of the gut microbiota. Atherosclerosis 2015; 241:387-99. [PMID: 26071662 PMCID: PMC4510029 DOI: 10.1016/j.atherosclerosis.2015.05.035] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Revised: 05/27/2015] [Accepted: 05/27/2015] [Indexed: 02/06/2023]
Abstract
Recent studies have convincingly linked gut microbiota to traits relevant to atherosclerosis, such as insulin resistance, dyslipidemia and inflammation, and have revealed novel disease pathways involving microbe-derived metabolites. These results have important implications for understanding how environmental and genetic factors act together to influence cardiovascular disease (CVD) risk. Thus, dietary constituents are not only absorbed and metabolized by the host but they also perturb the gut microbiota, which in turn influence host metabolism and inflammation. It also appears that host genetics helps to shape the gut microbiota community. Here, we discuss challenges in understanding these interactions and the role they play in CVD.
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Affiliation(s)
- Elin Org
- Departments of Medicine, Microbiology and Human Genetics, University of California, Los Angeles, CA, USA
| | - Margarete Mehrabian
- Departments of Medicine, Microbiology and Human Genetics, University of California, Los Angeles, CA, USA
| | - Aldons J Lusis
- Departments of Medicine, Microbiology and Human Genetics, University of California, Los Angeles, CA, USA.
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Abstract
γ-butyrobetaine has long been known as the precursor of endogenous L-carnitine synthesis. In this issue, Koeth et al. (2014) demonstrate that it is also a major metabolite of L-carnitine degradation by gut bacteria that precedes the enteric production of trimethylamine and trimethylamine-N-oxide.
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Affiliation(s)
- Sandrine Paule Claus
- Department of Food and Nutritional Sciences, The University of Reading, PO Box 226, Reading RG6 6AP, UK.
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19
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Cozzolino R, De Magistris L, Saggese P, Stocchero M, Martignetti A, Di Stasio M, Malorni A, Marotta R, Boscaino F, Malorni L. Use of solid-phase microextraction coupled to gas chromatography–mass spectrometry for determination of urinary volatile organic compounds in autistic children compared with healthy controls. Anal Bioanal Chem 2014; 406:4649-62. [DOI: 10.1007/s00216-014-7855-z] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 04/23/2014] [Accepted: 04/24/2014] [Indexed: 11/30/2022]
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Maćkiewicz E, Szynkowska MI. Oxidation of odorous nitrogen-containing compounds: ammonia and trimethylamine over Cu/zeolite catalysts. REACTION KINETICS MECHANISMS AND CATALYSIS 2013. [DOI: 10.1007/s11144-013-0666-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Chan ST, Yao MWY, Wong YC, Wong T, Mok CS, Sin DWM. Evaluation of chemical indicators for monitoring freshness of food and determination of volatile amines in fish by headspace solid-phase microextraction and gas chromatography-mass spectrometry. Eur Food Res Technol 2006. [DOI: 10.1007/s00217-006-0290-4] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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22
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Podadera P, Sipahi AM, Arêas JAG, Lanfer-Marquez UM. Diagnosis of suspected trimethylaminuria by NMR spectroscopy. Clin Chim Acta 2005; 351:149-54. [PMID: 15563884 DOI: 10.1016/j.cccn.2004.09.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2004] [Revised: 08/31/2004] [Accepted: 09/01/2004] [Indexed: 11/21/2022]
Abstract
BACKGROUND Trimethylamine (TMA) is a volatile substance produced in the gut, absorbed into the blood and further metabolized by healthy individuals into trimethylamine-N-oxide (TMAO) by TMA-oxidase and then excreted in urine. Patients suffering from trimethylaminuria (TMAU) show an impaired enzymatic oxidation of TMA, excreting this amine in breath, urine and other body secretions which confers an unpleasant body odor. METHODS We diagnosed a Brazilian adult male patient suspected of trimethylaminuria with a burden of choline bitartarate by monitoring the urinary excretion of TMA and TMAO by proton nuclear magnetic resonance spectroscopy ((1)H-NMR). RESULTS The patient's urinalyses showed an augmented TMA (12.64+/-0.95 mg/l) and TMAO (88.42+/-0.82 mg/l) excretion 6 h after the overload test representing an oxidation capacity of 84.6%, consistent with a heterozygosis condition. Diets containing tuna fish or eggs resulted in an excretion of TMA and TMAO similar to that of the control diet. Only the diet based on dogfish, rich in TMAO, enhanced the excretion of TMA and TMAO reaching 24.65 and 1055.55 mg/l, respectively, in the 0-24 h urine sample. CONCLUSIONS It was concluded first, that the patient was not able to metabolize the dietary overload of TMA and second, that more studies are needed to substantiate foods that should be avoided, especially regarding fish, due to their high TMA precursor contents.
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Affiliation(s)
- Priscilla Podadera
- Departamento de Alimentos e Nutrição Experimental, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, Av. Prof. Lineu Prestes, 580, CEP 05508-900-São Paulo, Brazil
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Current Awareness in Flavour and Fragrance. FLAVOUR FRAG J 2003. [DOI: 10.1002/ffj.1208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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