1
|
Faucher Q, Chadet S, Humeau A, Sauvage FL, Arnion H, Gatault P, Buchler M, Roger S, Lawson R, Marquet P, Barin-Le Guellec C. Impact of hypoxia and reoxygenation on the extra/intracellular metabolome and on transporter expression in a human kidney proximal tubular cell line. Metabolomics 2023; 19:83. [PMID: 37704888 DOI: 10.1007/s11306-023-02044-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Accepted: 08/21/2023] [Indexed: 09/15/2023]
Abstract
INTRODUCTION Ischemia-reperfusion injury (IRI) induces several perturbations that alter immediate kidney graft function after transplantation and may affect long-term graft outcomes. Given the IRI-dependent metabolic disturbances previously reported, we hypothesized that proximal transporters handling endo/exogenous substrates may be victims of such lesions. OBJECTIVES This study aimed to determine the impact of hypoxia/reoxygenation on the human proximal transport system through two semi-targeted omics analyses. METHODS Human proximal tubular cells were cultured in hypoxia (6 or 24 h), each followed by 2, 24 or 48-h reoxygenation. We investigated the transcriptomic modulation of transporters. Using semi-targeted LC-MS/MS profiling, we characterized the extra/intracellular metabolome. Statistical modelling was used to identify significant metabolic variations. RESULTS The expression profile of transporters was impacted during hypoxia (y + LAT1 and OCTN2), reoxygenation (MRP2, PEPT1/2, rBAT, and OATP4C1), or in both conditions (P-gp and GLUT1). The P-gp and GLUT1 transcripts increased (FC (fold change) = 2.93 and 4.11, respectively) after 2-h reoxygenation preceded by 24-h hypoxia. We observed a downregulation (FC = 0.42) of y+LAT1 after 24-h hypoxia, and of PEPT2 after 24-h hypoxia followed by 2-h reoxygenation (FC = 0.40). Metabolomics showed that hypoxia altered the energetic pathways. However, intracellular metabolic homeostasis and cellular exchanges were promptly restored after reoxygenation. CONCLUSION This study provides insight into the transcriptomic response of the tubular transporters to hypoxia/reoxygenation. No correlation was found between the expression of transporters and the metabolic variations observed. Given the complexity of studying the global tubular transport systems, we propose that further studies focus on targeted transporters.
Collapse
Affiliation(s)
- Quentin Faucher
- U1248 Pharmacology & Transplantation, INSERM and Univ. Limoges, 87000, Limoges, France
| | - Stéphanie Chadet
- EA4245, Transplantation, Immunologie, Inflammation, Univ. Tours, 37000, Tours, France
| | - Antoine Humeau
- U1248 Pharmacology & Transplantation, INSERM and Univ. Limoges, 87000, Limoges, France
- Department of Pharmacology, Toxicology and Pharmacovigilance, University Hospital of Limoges, 87000, Limoges, France
| | | | - Hélène Arnion
- U1248 Pharmacology & Transplantation, INSERM and Univ. Limoges, 87000, Limoges, France
| | - Philippe Gatault
- EA4245, Transplantation, Immunologie, Inflammation, Univ. Tours, 37000, Tours, France
- Nephrology and Immunology Department, Bretonneau Hospital, 37000, Tours, France
| | - Matthias Buchler
- EA4245, Transplantation, Immunologie, Inflammation, Univ. Tours, 37000, Tours, France
- Nephrology and Immunology Department, Bretonneau Hospital, 37000, Tours, France
| | - Sébastien Roger
- EA4245, Transplantation, Immunologie, Inflammation, Univ. Tours, 37000, Tours, France
| | - Roland Lawson
- U1248 Pharmacology & Transplantation, INSERM and Univ. Limoges, 87000, Limoges, France
| | - Pierre Marquet
- U1248 Pharmacology & Transplantation, INSERM and Univ. Limoges, 87000, Limoges, France.
- Department of Pharmacology, Toxicology and Pharmacovigilance, University Hospital of Limoges, 87000, Limoges, France.
| | - Chantal Barin-Le Guellec
- U1248 Pharmacology & Transplantation, INSERM and Univ. Limoges, 87000, Limoges, France
- Department of Biochemistry and Molecular Biology, CHRU de Tours, 37000, Tours, France
| |
Collapse
|
2
|
Verstraeten L, Den Abt R, Ghesquière B, Jochmans I. Current Insights into the Metabolome during Hypothermic Kidney Perfusion-A Scoping Review. J Clin Med 2023; 12:jcm12113613. [PMID: 37297808 DOI: 10.3390/jcm12113613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 05/16/2023] [Accepted: 05/20/2023] [Indexed: 06/12/2023] Open
Abstract
This scoping review summarizes what is known about kidney metabolism during hypothermic perfusion preservation. Papers studying kidney metabolism during hypothermic (<12 °C) perfusion were identified (PubMed, Embase, Web of Science, Cochrane). Out of 14,335 initially identified records, 52 were included [dog (26/52), rabbit (2/52), pig (20/52), human (7/52)]. These were published between 1970-2023, partially explaining study heterogeneity. There is a considerable risk of bias in the reported studies. Studies used different perfusates, oxygenation levels, kidney injury levels, and devices and reported on perfusate and tissue metabolites. In 11 papers, (non)radioactively labeled metabolites (tracers) were used to study metabolic pathways. Together these studies show that kidneys are metabolically active during hypothermic perfusion, regardless of the perfusion setting. Although tracers give us more insight into active metabolic pathways, kidney metabolism during hypothermic perfusion is incompletely understood. Metabolism is influenced by perfusate composition, oxygenation levels, and likely also by pre-existing ischemic injury. In the modern era, with increasing donations after circulatory death and the emergence of hypothermic oxygenated perfusion, the focus should be on understanding metabolic perturbations caused by pre-existing injury levels and the effect of perfusate oxygen levels. The use of tracers is indispensable to understanding the kidney's metabolism during perfusion, given the complexity of interactions between different metabolites.
Collapse
Affiliation(s)
- Laurence Verstraeten
- Laboratory of Abdominal Transplantation KU Leuven, Transplantation Research Group, Department of Microbiology, Immunology and Transplantation, KU Leuven, 3000 Leuven, Belgium
| | - Rutger Den Abt
- Laboratory of Abdominal Transplantation KU Leuven, Transplantation Research Group, Department of Microbiology, Immunology and Transplantation, KU Leuven, 3000 Leuven, Belgium
| | - Bart Ghesquière
- Metabolomics Expertise Center, Center for Cancer Biology, VIB, 3000 Leuven, Belgium
- Laboratory of Applied Mass Spectrometry, Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium
| | - Ina Jochmans
- Laboratory of Abdominal Transplantation KU Leuven, Transplantation Research Group, Department of Microbiology, Immunology and Transplantation, KU Leuven, 3000 Leuven, Belgium
- Department of Abdominal Transplant Surgery, University Hospitals Leuven, 3000 Leuven, Belgium
| |
Collapse
|
3
|
Gonzalez-Viedma A, Van Dyck R, De Beule J, Ghesquière B, Jochmans I. Unraveling metabolism during kidney perfusion using tracer studies, a systematic review. Artif Organs 2022; 46:2118-2134. [PMID: 35848397 DOI: 10.1111/aor.14355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 06/02/2022] [Accepted: 07/03/2022] [Indexed: 12/09/2022]
Abstract
BACKGROUND Understanding kidney metabolism during perfusion is vital to further develop the technology as a preservation, viability assessment, and resuscitation platform. We reviewed the evidence on the use of labeled metabolites (tracers) to understand "on-pump" kidney behavior. METHODS PubMed, Embase, Web of Science, and Cochrane databases were systematically searched for studies evaluating metabolism of (non)radioactively labeled endogenous compounds during kidney perfusion. RESULTS Of 5899 articles, 30 were included. All were animal studies [rat (70%), dog (13%), pig (10%), rabbit (7%)] perfusing but not transplanting kidneys. Perfusion took place at hypothermic (4-12°C) (20%), normothermic (35-40°C) (77%), or undefined temperatures (3%). Hypothermic perfusion used albumin or a clinical kidney preservation solution, mostly in the presence of oxygen. Normothermic perfusion was mostly performed with oxygenated crystalloids often containing glucose and amino acids with unclear partial oxygen tensions. Active metabolism of carbohydrate, amino acid, lipids, and large molecules was shown in hypothermic and normothermic perfusion. Production of macromolecules, such as prostaglandin, thromboxane, and vitamin D, takes place during normothermic perfusion. No experiments compared differences in metabolic activity between hypothermic and normothermic perfusion. One conference abstract showed increased anaerobic metabolism in kidneys donated after circulatory death by adding labeled glucose to hypothermically perfused human kidneys. CONCLUSIONS Tracer studies during kidney perfusion contribute to unraveling kidney metabolic behavior in pre-clinical models. Whether findings are truly translational needs further investigation in large animal models of human kidneys. Furthermore, it is essential to better understand how ischemia changes this metabolic behavior.
Collapse
Affiliation(s)
- Arantxa Gonzalez-Viedma
- Department of Microbiology, Immunology, and Transplantation, Transplantation Research Group, Lab of Abdominal Transplantation, KU Leuven, Leuven, Belgium
| | - Robbe Van Dyck
- Department of Microbiology, Immunology, and Transplantation, Transplantation Research Group, Lab of Abdominal Transplantation, KU Leuven, Leuven, Belgium
| | - Julie De Beule
- Department of Microbiology, Immunology, and Transplantation, Transplantation Research Group, Lab of Abdominal Transplantation, KU Leuven, Leuven, Belgium
| | - Bart Ghesquière
- Metabolomics Expertise Center, Center for Cancer Biology, VIB Center for Cancer Biology, Leuven, Belgium.,Metabolomics Expertise Center, Department of Oncology, KU Leuven, Leuven, Belgium
| | - Ina Jochmans
- Department of Microbiology, Immunology, and Transplantation, Transplantation Research Group, Lab of Abdominal Transplantation, KU Leuven, Leuven, Belgium.,Department of Abdominal Transplant Surgery, University Hospitals Leuven, Leuven, Belgium
| |
Collapse
|
4
|
Lutz NW, Bernard M. Methodological Developments for Metabolic NMR Spectroscopy from Cultured Cells to Tissue Extracts: Achievements, Progress and Pitfalls. Molecules 2022; 27:molecules27134214. [PMID: 35807461 PMCID: PMC9268249 DOI: 10.3390/molecules27134214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 06/08/2022] [Accepted: 06/20/2022] [Indexed: 12/04/2022] Open
Abstract
This is a broad overview and critical review of a particular group of closely related ex vivo and in vitro metabolic NMR spectroscopic methods. The scope of interest comprises studies of cultured cells and excised tissue, either intact or after physicochemical extraction of metabolites. Our detailed discussion includes pitfalls that have led to erroneous statements in the published literature, some of which may cause serious problems in metabolic and biological interpretation of results. To cover a wide range of work from relevant research areas, we consider not only the most recent achievements in the field, but also techniques that proved to be valid and successful in the past, although they may not have generated a very significant number of papers more recently. Thus, this comparative review also aims at providing background information useful for judiciously choosing between the metabolic ex vivo/in vitro NMR methods presented. Finally, the methods of interest are discussed in the context of, and in relation to, other metabolic analysis protocols such as HR-MAS and cell perfusion NMR, as well as the mass spectrometry approach.
Collapse
|
5
|
Tatsis V, Dounousi E, Mitsis M. Hypothermic Machine Perfusion of Kidney Transplant: A Mini-Review. Transplant Proc 2021; 53:2793-2796. [PMID: 34696905 DOI: 10.1016/j.transproceed.2021.09.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Most kidney grafts are marginal and from deceased donors, which yield worse clinical outcomes. Hypothermic machine perfusion has created a paradigm shift in kidney preservation. This mini-review summarizes the main points of hypothermic machine perfusion of kidney transplants that should be known by any physician and surgeon involved with kidney transplantation. Specifically, this review explains a proposed mechanism of action of hypothermic machine perfusion of kidney transplants. This review also describes the clinical effectiveness of hypothermic machine perfusion and explains how to evaluate and predict graft functionality according to machine parameters and perfusate biomarkers. Finally, treatment options and the most recent studies on oxygenated hypothermic machine perfusion are mentioned.
Collapse
Affiliation(s)
| | - Evangelia Dounousi
- Department of Nephrology, University Hospital of Ioannina, Ioannina, Greece
| | | |
Collapse
|
6
|
Bodor A, Haller JD, Bouguechtouli C, Theillet FX, Nyitray L, Luy B. Power of Pure Shift HαCα Correlations: A Way to Characterize Biomolecules under Physiological Conditions. Anal Chem 2020; 92:12423-12428. [PMID: 32786451 DOI: 10.1021/acs.analchem.0c02182] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Intrinsically disordered proteins (IDPs) constitute an important class of biomolecules with high flexibility. Atomic-resolution studies for these molecules are essentially limited to NMR spectroscopy, which should be performed under physiological pH and temperature to populate relevant conformational ensembles. In this context, however, fundamental problems arise with established triple resonance NMR experiments: high solvent accessibility of IDPs promotes water exchange, which disfavors classical amide 1H-detection, while 13C-detection suffers from significantly reduced sensitivity. A favorable alternative, the conventional detection of nonexchangeable 1Hα, so far resulted in broad signals with insufficient resolution and sensitivity. To overcome this, we introduce here a selective Hα,Cα-correlating pure shift detection scheme, the selective Hα,Cα-HSQC (SHACA-HSQC), using extensive hetero- and homonuclear decoupling applicable to aqueous samples (≥90% H2O) and tested on small molecules and proteins. SHACA-HSQC spectra acquired on IDPs provide uncompromised resolution and sensitivity (up to fivefold increased S/N compared to the standard 1H,13C-HSQC), as shown for resonance distinction and unambiguous assignment on the disordered transactivation domain of the tumor suppressor p53, α-synuclein, and folded ubiquitin. The detection scheme can be implemented in any 1Hα-detected triple resonance experiment and may also form the basis for the detection of isotope-labeled markers in biological studies or compound libraries.
Collapse
Affiliation(s)
- Andrea Bodor
- Institute of Chemistry, Eötvös Loránd University, Pázmány Péter sétány 1/a, Budapest 1117, Hungary
| | - Jens D Haller
- Institut für Organische Chemie and Institut für Biologische Grenzflächen 4-Magnetische Resonanz, Karlsruher Institut für Technologie (KIT), Fritz-Haber-Weg 6, Karlsruhe 76133, Germany
| | - Chafiaa Bouguechtouli
- Institute of Integrative Biology of the Cell, UMR9198, CNRS/CEA/ University of Paris Saclay, Gif-Sur-Yvette 911991, France
| | - Francois-Xavier Theillet
- Institute of Integrative Biology of the Cell, UMR9198, CNRS/CEA/ University of Paris Saclay, Gif-Sur-Yvette 911991, France
| | - László Nyitray
- Department of Biochemistry, Eötvös Loránd University, Pázmány Péter sétány 1/c, Budapest 1117, Hungary
| | - Burkhard Luy
- Institut für Organische Chemie and Institut für Biologische Grenzflächen 4-Magnetische Resonanz, Karlsruher Institut für Technologie (KIT), Fritz-Haber-Weg 6, Karlsruhe 76133, Germany
| |
Collapse
|
7
|
Kvietkauskas M, Zitkute V, Leber B, Strupas K, Stiegler P, Schemmer P. The Role of Metabolomics in Current Concepts of Organ Preservation. Int J Mol Sci 2020; 21:ijms21186607. [PMID: 32927605 PMCID: PMC7555311 DOI: 10.3390/ijms21186607] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Revised: 09/06/2020] [Accepted: 09/08/2020] [Indexed: 12/16/2022] Open
Abstract
In solid organ transplantation (Tx), both survival rates and quality of life have improved dramatically over the last few decades. Each year, the number of people on the wait list continues to increase, widening the gap between organ supply and demand. Therefore, the use of extended criteria donor grafts is growing, despite higher susceptibility to ischemia-reperfusion injury (IRI) and consecutive inferior Tx outcomes. Thus, tools to characterize organ quality prior to Tx are crucial components for Tx success. Innovative techniques of metabolic profiling revealed key pathways and mechanisms involved in IRI occurring during organ preservation. Although large-scale trials are needed, metabolomics appears to be a promising tool to characterize potential biomarkers, for the assessment of graft quality before Tx and evaluate graft-related outcomes. In this comprehensive review, we summarize the currently available literature on the use of metabolomics in solid organ Tx, with a special focus on metabolic profiling during graft preservation to assess organ quality prior to Tx.
Collapse
Affiliation(s)
- Mindaugas Kvietkauskas
- General, Visceral and Transplant Surgery, Department of Surgery, Medical University of Graz, Auenbruggerpl. 2, Graz 8036, Austria; (M.K.); (V.Z.); (B.L.); (P.S.)
- Faculty of Medicine, Vilnius University, M. K. Ciurlionio 21, 03101 Vilnius, Lithuania;
| | - Viktorija Zitkute
- General, Visceral and Transplant Surgery, Department of Surgery, Medical University of Graz, Auenbruggerpl. 2, Graz 8036, Austria; (M.K.); (V.Z.); (B.L.); (P.S.)
- Faculty of Medicine, Vilnius University, M. K. Ciurlionio 21, 03101 Vilnius, Lithuania;
| | - Bettina Leber
- General, Visceral and Transplant Surgery, Department of Surgery, Medical University of Graz, Auenbruggerpl. 2, Graz 8036, Austria; (M.K.); (V.Z.); (B.L.); (P.S.)
| | - Kestutis Strupas
- Faculty of Medicine, Vilnius University, M. K. Ciurlionio 21, 03101 Vilnius, Lithuania;
| | - Philipp Stiegler
- General, Visceral and Transplant Surgery, Department of Surgery, Medical University of Graz, Auenbruggerpl. 2, Graz 8036, Austria; (M.K.); (V.Z.); (B.L.); (P.S.)
- Correspondence: ; Tel.: +43-316-385-84094
| | - Peter Schemmer
- General, Visceral and Transplant Surgery, Department of Surgery, Medical University of Graz, Auenbruggerpl. 2, Graz 8036, Austria; (M.K.); (V.Z.); (B.L.); (P.S.)
| |
Collapse
|
8
|
The Effects of Oxygenation on Ex Vivo Kidneys Undergoing Hypothermic Machine Perfusion. Transplantation 2019; 103:314-322. [PMID: 30461718 DOI: 10.1097/tp.0000000000002542] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Supplemental oxygenation of the standard hypothermic machine perfusion (HMP) circuit has the potential to invoke favorable changes in metabolism, optimizing cadaveric organs before transplantation. METHODS Eight pairs of porcine kidneys underwent 18 hours of either oxygenated (HMP/O2) or aerated (HMP/Air) HMP in a paired donation after circulatory death model of transplantation. Circulating perfusion fluid was supplemented with the metabolic tracer universally labeled glucose.Perfusate, end-point renal cortex, and medulla samples underwent metabolomic analysis using 1-dimension and 2-dimension nuclear magnetic resonance experiments in addition to gas chromatography-mass spectrometry. Analysis of C-labeled metabolic products was combined with adenosine nucleotide levels and differences in tissue architecture. RESULTS Metabolomic analysis revealed significantly higher concentrations of universally labeled lactate in the cortex of HMP/Air versus HMP/O2 kidneys (0.056 mM vs 0.026 mM, P < 0.05). Conversely, newly synthesized [4,5-C] glutamate concentrations were higher in the cortex of HMP/O2 kidneys inferring relative increases in tricarboxylic acid cycle activity versus HMP/Air kidneys (0.013 mmol/L vs 0.003 mmol/L, P < 0.05). This was associated with greater amounts of adenoside triphosphate in the cortex HMP/O2 versus HMP/Air kidneys (19.8 mmol/mg protein vs 2.8 mmol/mg protein, P < 0.05). Improved flow dynamics and favorable ultrastructural features were also observed in HMP/O2 kidneys. There were no differences in thiobarbituric acid reactive substances and reduced glutathione levels, tissue markers of oxidative stress, between groups. CONCLUSIONS The supplementation of perfusion fluid with high-concentration oxygen (95%) results in a greater degree of aerobic metabolism versus aeration (21%) in the nonphysiological environment of HMP, with reciprocal changes in adenoside triphosphate levels.
Collapse
|
9
|
Geier FM, Leroi AM, Bundy JG. 13C Labeling of Nematode Worms to Improve Metabolome Coverage by Heteronuclear Nuclear Magnetic Resonance Experiments. Front Mol Biosci 2019; 6:27. [PMID: 31106208 PMCID: PMC6498324 DOI: 10.3389/fmolb.2019.00027] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Accepted: 04/04/2019] [Indexed: 11/29/2022] Open
Abstract
Nuclear magnetic resonance (NMR) spectroscopy is widely used as a metabolomics tool, and 1D spectroscopy is overwhelmingly the commonest approach. The use of 2D spectroscopy could offer significant advantages in terms of increased spectral dispersion of peaks, but has a number of disadvantages—in particular, heteronuclear 2D spectroscopy is often much less sensitive than 1D NMR. One factor contributing to this low sensitivity in 13C/1H heteronuclear NMR is the low natural abundance of the 13C stable isotope; as a consequence, where it is possible to label biological material with 13C, there is a potential enhancement of sensitivity of up to around 90fold. However, there are some problems that can reduce the advantages otherwise gained—in particular, the fine structure arising from 13C/13C coupling, which is essentially non-existent at natural abundance, can reduce the possible sensitivity gain and increase the chances of peak overlap. Here, we examined the use of two different heteronuclear single quantum coherence (HSQC) pulse sequences for the analysis of fully 13C-labeled tissue extracts from Caenorhabditis elegans nematodes. The constant time ct-HSQC had improved peak shape, and consequent better peak detection of metabolites from a labeled extract; matching this against reference spectra from the HMDB gave a match to about 300 records (although fewer actual metabolites, as some of these represent false positive matches). This approach gives a rapid and automated initial metabolome assignment, forming an ideal basis for further manual curation.
Collapse
Affiliation(s)
- Florian M Geier
- Department of Surgery and Cancer, Imperial College London, London, United Kingdom
| | - Armand M Leroi
- Department of Life Sciences, Imperial College London, South Kensington, London, United Kingdom
| | - Jacob G Bundy
- Department of Surgery and Cancer, Imperial College London, London, United Kingdom
| |
Collapse
|
10
|
|
11
|
Rapid two-dimensional ALSOFAST-HSQC experiment for metabolomics and fluxomics studies: application to a 13C-enriched cancer cell model treated with gold nanoparticles. Anal Bioanal Chem 2018; 410:2793-2804. [PMID: 29480388 DOI: 10.1007/s00216-018-0961-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2017] [Revised: 02/01/2018] [Accepted: 02/09/2018] [Indexed: 02/05/2023]
Abstract
Isotope labeling enables the use of 13C-based metabolomics techniques with strongly improved resolution for a better identification of relevant metabolites and tracing of metabolic fluxes in cell and animal models, as required in fluxomics studies. However, even at high NMR-active isotope abundance, the acquisition of one-dimensional 13C and classical two-dimensional 1H,13C-HSQC experiments remains time consuming. With the aim to provide a shorter, more efficient alternative, herein we explored the ALSOFAST-HSQC experiment with its rapid acquisition scheme for the analysis of 13C-labeled metabolites in complex biological mixtures. As an initial step, the parameters of the pulse sequence were optimized to take into account the specific characteristics of the complex samples. We then applied the fast two-dimensional experiment to study the effect of different kinds of antioxidant gold nanoparticles on a HeLa cancer cell model grown on 13C glucose-enriched medium. As a result, 1H,13C-2D correlations could be obtained in a couple of seconds to few minutes, allowing a simple and reliable identification of various 13C-enriched metabolites and the determination of specific variations between the different sample groups. Thus, it was possible to monitor glucose metabolism in the cell model and study the antioxidant effect of the coated gold nanoparticles in detail. Finally, with an experiment time of only half an hour, highly resolved 1H,13C-HSQC spectra using the ALSOFAST-HSQC pulse sequence were acquired, revealing the isotope-position-patterns of the corresponding 13C-nuclei from carbon multiplets. Graphical abstract Fast NMR applied to metabolomics and fluxomics studies with gold nanoparticles.
Collapse
|
12
|
Smith TB, Patel K, Munford H, Peet A, Tennant DA, Jeeves M, Ludwig C. High-Speed Tracer Analysis of Metabolism (HS-TrAM). Wellcome Open Res 2018. [DOI: 10.12688/wellcomeopenres.13387.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Tracing the fate of stable isotopically-enriched nutrients is a sophisticated method of describing and quantifying the activity of metabolic pathways. Nuclear Magnetic Resonance (NMR) offers high resolution data, yet is under-utilised due to length of time required to collect the data, quantification requiring multiple samples and complicated analysis. Here we present two techniques, quantitative spectral filters and enhancement of the splitting due to J-coupling in 1H,13C-HSQC NMR spectra, which allow the rapid collection of NMR data in a quantitative manner on a single sample. The reduced duration of HSQC spectra data acquisition opens up the possibility of real-time tracing of metabolism including the study of metabolic pathways in vivo. We show how these novel techniques can be used to trace the fate of labelled nutrients in a whole organ model of kidney preservation prior to transplantation using a porcine kidney as a model organ, and also show how the use of multiple nutrients, differentially labelled with 13C and 15N, can be used to provide additional information with which to profile metabolic pathways.
Collapse
|
13
|
Smith TB, Patel K, Munford H, Peet A, Tennant DA, Jeeves M, Ludwig C. High-Speed Tracer Analysis of Metabolism (HS-TrAM). Wellcome Open Res 2018; 3:5. [PMID: 29503875 PMCID: PMC5811808 DOI: 10.12688/wellcomeopenres.13387.2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/03/2018] [Indexed: 12/29/2022] Open
Abstract
Tracing the fate of stable isotopically-enriched nutrients is a sophisticated method of describing and quantifying the activity of metabolic pathways. Nuclear Magnetic Resonance (NMR) spectroscopy offers high resolution data in terms of resolving metabolic pathway utilisation. Despite this, NMR spectroscopy is under-utilised due to length of time required to collect the data, quantification requiring multiple samples and complicated analysis. Here we present two techniques, quantitative spectral filters and enhancement of the splitting of
13C signals due to homonuclear
13C,
13C or heteronuclear
13C,
15N J-coupling in
1H,
13C-HSQC NMR spectra. Together, these allow the rapid collection of NMR spectroscopy data in a quantitative manner on a single sample. The reduced duration of HSQC spectra data acquisition opens up the possibility of real-time tracing of metabolism including the study of metabolic pathways
in vivo. We show how these techniques can be used to trace the fate of labelled nutrients in a whole organ model of kidney preservation prior to transplantation using a porcine kidney as a model organ. In addition, we show how the use of multiple nutrients, differentially labelled with
13C and
15N, can be used to provide additional information with which to profile metabolic pathways.
Collapse
Affiliation(s)
- Thomas Brendan Smith
- Institute of Metabolism and Systems Research, University of Birmingham, West Midlands, UK
| | - Kamlesh Patel
- Institute of Metabolism and Systems Research, University of Birmingham, West Midlands, UK
| | - Haydn Munford
- Institute of Metabolism and Systems Research, University of Birmingham, West Midlands, UK
| | - Andrew Peet
- Institute of Cancer and Genomic Sciences, University of Birmingham, West Midlands, UK.,Birmingham Children's Hospital NHS Foundation Trust, West Midlands, UK
| | - Daniel A Tennant
- Institute of Metabolism and Systems Research, University of Birmingham, West Midlands, UK
| | - Mark Jeeves
- Institute of Cancer and Genomic Sciences, University of Birmingham, West Midlands, UK
| | - Christian Ludwig
- Institute of Metabolism and Systems Research, University of Birmingham, West Midlands, UK
| |
Collapse
|
14
|
Abstract
PURPOSE OF REVIEW Machine perfusion technologies provide an opportunity for improved preservation, organ assessment, and resuscitation of damaged kidneys. This review summarizes the recent advances in hypothermic and normothermic kidney machine perfusion technologies. RECENT FINDINGS Modifications to the perfusion conditions with the addition of oxygen during hypothermic machine perfusion can support a low level of metabolism, which in experimental settings improves graft function. Normothermic machine perfusion technologies are evolving in different directions including short-duration resuscitation, more prolonged periods of perfusion, and the transition between hypothermic and normothermic conditions. Clinical trials are ongoing in both hypothermic and normothermic settings. Functional parameters can be used to assess kidney quality and although normothermic machine perfusion may hold an advantage over hypothermic machine perfusion, new metabolomic, proteomic, and genomic technologies may be applied in the future to both technologies to provide more rigorous information on kidney quality. Promoting recovery by introducing an intervention during perfusion is an attractive area of research and therapies targeting the endothelium are a particular area of interest. SUMMARY A great deal of research is still needed to optimize and logistically place hypothermic and normothermic perfusion technologies. In the future, we may progress toward organ-tailored preservation whereby high-risk kidneys can undergo assessment and repair before transplantation.
Collapse
|
15
|
Nath J, Smith TB, Patel K, Ebbs SR, Hollis A, Tennant DA, Ludwig C, Ready AR. Metabolic differences between cold stored and machine perfused porcine kidneys: A 1 H NMR based study. Cryobiology 2017; 74:115-120. [DOI: 10.1016/j.cryobiol.2016.11.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Revised: 10/18/2016] [Accepted: 11/21/2016] [Indexed: 10/20/2022]
|
16
|
Nuclear Magnetic Resonance Strategies for Metabolic Analysis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 965:45-76. [DOI: 10.1007/978-3-319-47656-8_3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
|