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15 protocols using succinic acid d4

1

Analytical Workflow for Metabolite Profiling

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All water
used was of type 1 (>18 MΩ cm), obtained from a MilliQ ultrapure
water purification system (Merck Millipore, Darmstadt, Germany). Methanol
was obtained from Rathburn Chemicals (Walkerburn, Scotland). Formic
acid (98%) was obtained from Merck.
Tobramycin, acylcarnitines
C2, C12, and C16, D2 glycolic acid, D6 glucose, and acylcarnitines
D3 C2, D3 C12, and D3 C16 were obtained from Larodan (Solna, Sweden).
D4 succinic acid, 13C creatine, and uric acid were purchased
from Sigma (Darmstadt, Germany). Vancomycin (1000 mg powder) was obtained
from MIP Pharma GmbH (Blieskastel, Germany). 13C2 guanidinoacetate was obtained from Dr. H Ten Brink (VU University
Medical Center, Amsterdam, The Netherlands). Creatinine was obtained
from Merck. Creatine was obtained from Nutritional Biochemical Corporation
(Cleveland, OH, USA).
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2

GC-MS Analysis of Liver Tumor Metabolites

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Approximately 50 mg of snap-frozen mouse liver tumors was determined by GC-MS analysis as previously reported (19 (link)). Metabolites were extracted with cold 90% methanol and an internal standard d4-succinic acid (Sigma) was added for every 25 mg of tissue. The samples were homogenized, and supernatant was collected by centrifugation and another internal standard, d27-myristic acid, was added. All samples were then dried en vacuo and resuspended in pyridine containing 40 mg/ml O-methoxylamine hydrochloride (MOX) before GC-MS analysis on an Agilent Zorbax DB-5MS column. Metabolites were identified and their peak area was recorded using MassHunter Quant and analyzed with MassHunter software (Agilent). Statistical analysis was performed using MetaboAnalystR.
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3

Metabolite Extraction from Tissue and Serum

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In order to extract metabolites from the tissue, each sample was transferred to 2.0 ml ceramic bead mill tubes (bioExpress). Each sample received 450 ul of 90% cold methanol in diH2O for every 25 mg of tissue. The samples were then homogenized in an OMNI Bead Ruptor 24. Homogenized samples were then incubated at −20 °C for 1 hr. D4-succinic acid (Sigma 293075) was added to each sample as an internal standard. After incubation, all the samples were centrifuged at 20,000 x g for 10 min at 4 °C. 450 ul of supernatant was then transferred from each bead mill tube into a labeled, fresh micro centrifuge tube where another internal standard d27-myristic acid (CDN Isotopes: D-1711). Samples were then dried en vacuo. For metabolite extraction from serum, 90% methanol in diH2O containing D4-succinic acid was added to each sample to give a final methanol concentration of 80%. Samples were vortexed and incubated at −20 °C for 1 hr. After incubation, all samples were centrifuged at 20,000 x g for 10 min at 4 °C. Another internal standard, d27-myristic acid (CDN Isotopes: D-1711), was added to each sample. Process blanks were made using the extraction solvent and went through the same process steps as the real samples. The samples were then dried en vacuo.
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4

Metabolite Extraction and Derivatization

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Acetonitrile, isopropanol, and pyridine were of HPLC grade, and methoxyamine hydrochloride (MeOX), 1% TMCS in N-methyl-N-trimethylsilyl-trifluoroacetamide (MSTFA), adonitol, and d4-succinic acid were obtained from Sigma-Aldrich, St. Louis, MO, USA.
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5

Comprehensive Analytical Standards for Metabolomics

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All water used was of type 1 (>18 MΩ cm), obtained from MilliQ ultrapure water purification system (Merck Millipore, Darmstadt, Germany). Methanol was obtained from Rathburn Chemicals (Walkerburn, Scotland). Formic acid (98%) was obtained from Merck.
Tobramycin, acylcarnitines C2, C12, and C16, D2 glycolic acid, D6 glucose and acylcarnitines D3 C2, D3 C12 and D3 C16 were obtained from Larodan (Solna, Sweden). D4 succinic acid, 13 C creatine and uric acid were purchased from Sigma (Darmstadt, Germany).
Vancomycin (1000 mg powder) was obtained from MIP Pharma GmbH (Blieskastel, Germany). 13 C 2 guanidinoacetate was obtained from Dr. H Ten Brink (VU University Medical Center, Amsterdam, The Netherlands). Creatinine was obtained from Merck. Creatine was obtained from Nutritional Biochemical Corporation (Cleveland, OH, USA).
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6

Extracting Intracellular Metabolites via Rapid Quenching

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4 mL cell cultures were mixed with 6 mL cold methanol (−40°C) to arrest metabolism instantaneously. Then, samples were centrifugated at 3000 g for 3 min. Cell pellets were collected and immediately ground to powder in a porcelain mortar, which was pre-cooled to −80°C, under liquid nitrogen for 5 min. Then 100 mg cell powder was mixed thoroughly with 1 ml −40°C 50% methanol (methanol/water, 1:1). The samples were centrifugated at 10000 g for 10 min. The supernatants were collected. Then 10 uL internal standard solution succinic d4 acid (Sigma, 0.1 mg/ml) was added into the 100 uL extract supernatants before lyophilization. After lyophilization, the derivatization and measurement by GC-MS of these samples were carried out according to a previous method [35 (link)]. Four biological replicates were performed for each sample. The identification and quantification of GC-MS peaks were performed using Agilent software (G1701DA MSD ChemStation ver. D.00.00.38).
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7

GC-MS Metabolite Profiling in Drosophila

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The GC-MS assays were performed as previously described (Papadimitropoulos et al., 2018 (link); Tennessen et al., 2014 (link)). Briefly, indicated flies were added with 800 µl prechilled 90% methanol containing 1.25 µg/ml succinic-d4 acid (293075; Sigma) and 6.25 µg/ml U-13C, U-15N amino acid mix (CDNLM-6784; Cambridge Isotope). Samples were then homogenized for 30 s at 6.45 m/s and incubated at −20 °C for 1 h to enhance protein precipitation, followed by centrifugation at 20,000 g for 5 min at 4 °C to remove the resulting precipitate. The supernatant was transferred to a 1.5 ml microfuge tube and the solvent removed with a Speed-Vac (Genevac). The GC-MS detection and analysis software was opened to create the experimental method (6890 Agilent GC with Leco pegasus IV time-of-flight MS instrument). 0.5ul of mixed reagent was drawn with a micro syringe and the sample was injected through the sample inlet of the gas chromatograph. Last, we use the BinBase database software to perform analysis.
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8

Quantification of NNK and Metabolites in Zebrafish

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4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) was obtained from LGC-Dr Ehrenstorfer (LGC Standards, Barcelona, Spain) and 4-Hydroxy-4-(3-pyridyl)-butyric acid (HPBA) was purchased from Toronto Research Chemicals (TRC, Ontario, Canada). The metabolites hypoxanthine, cytidine monophosphate (CMP), guanosine monophosphate (GMP), S-adenosylmethionine (SAM), and uridine monophosphate (UMP) were obtained from Sigma-Aldrich (Sigma-Aldrich, St. Louis, MO, USA). Internal standard (IS) solution was prepared with 1 mg mL -1 of succinic-d4 acid and myristic-d27 acid in methanol also from Sigma-Aldrich. All solvents used in the preparation of solutions were LC-MS grade. Fish water was prepared with reverse-osmosis purified water containing 90 µg mL -1 of Instant Ocean ® , 0.58 mM CaSO4•2H2O (Aquarium Systems, Sarrebourg, France).
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9

Plasma Metabolomics Analysis Protocol

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Plasma samples for metabolomics were acquired at baseline, 1 h from the start of the clamp and 20 min after the last infusion (50 ng adrenaline kg−1 min−1) using containers containing heparin. Plasma samples (30 μl) were mixed with 400 μl methanol, 10 μl internal standard mixture succinic acid-d4, glutamic acid-d5, valine-d8 and heptadecanoic acid-d33, Sigma Aldrich, USA), and incubated on ice for 30 min. Samples were then centrifuged (10,000 g, 3 min, 4°C), and 180 μl of the filtered extracts were evaporated to dryness and derivatised. A detailed description of the process has been presented previously [13 (link)]. A 7250 GC/Q-TOF instrument (Agilent, USA) equipped with a Gerstel MPS autosampler (Gerstel, Germany) was used to analyse the samples. Features from the quantitative ion peak areas of the data were matched against mass spectral libraries (in-house library, Fiehn library [14 (link)], GOLM DB [15 (link)], GNPS [16 (link)], HMDB [17 (link)] and MassBank Japan [18 (link)]).
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10

Metabolite Profiling of Biological Samples

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All solvents were high purity high-performance liquid chromatography (HPLC) grade purchased from J.T. Baker (Philipsburg, NJ, USA). Distilled water was filtered using a Milli-Q Reagent Water System (Millipore, Billerica, MA, USA). Methyloctanoate, succinic acid-d4, methoxyamine hydrochloride, pyridine, sodium sulfate, and boron trifluoride-methanol were purchased from Sigma-Aldrich (St. Louis, MO, USA). The certified reference material (CRM), a 37 fatty acid methyl ester mixture, and N-methyl-N-(trimethylsilyl)trifluoroacetamide with trimethylchlorosilane as a silylation reagent were purchased from Sigma-Aldrich (St. Louis, MO, USA). The standards of benzeneethanol, benzaldehyde, 1H-pyrrole-2-carboxaldehyde, γ-butyrolactone, γ-caprolactone, δ-hexalactone, γ-octalactone, ethylene glycol, l-(−)-arabitol, d-mannitol, scyllo-inositol, d-glyceric acid sodium salt, fumaric acid, d-psicofuranose, d-gluconic acid solution, and succinic acid were purchased from Sigma-Aldrich (St. Louis, MO, USA). 3-Octen-2-one, pantolactone, malic acid, and azelaic acid were obtained from Supelco (Bellefonte, PA, USA).
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