- Isotope-Labeled Compounds
- Hot Research Area
- Metabolic flux analysis: MFA
Metabolic flux analysis: MFA
Metabolic flux analysis (MFA) is a new approach in metabolomics research that uses stable isotope-labeled compounds as tracers to investigate intracellular metabolic and specific pathways. Stable isotope tracing techniques, usually based on 13C and 15N tracers, have emerged as the most accurate and widely used techniques in MFA. By combining metabolomics and MFA, we can better understand variations in metabolite levels, flow distribution, and turnover rates within the intracellular metabolic network. This approach enables the identification of main metabolic abnormal pathways and their biological functions, as well as uncovering the upstream and downstream regulatory mechanisms. This comprehensive insight provides a strong scientific basis for understanding the mechanisms underlying disease development, in addition to discovering and confirming potential drug targets. To understand how to screen isotope-labeled compounds as tracers in MFA experiments, please refer to the summary of the one-stop screening process for 13C tracers in MFA by Professor Dong-Hyun Kim et al.[1].

Figure 1. A typical carbon labelling experiment (CLE) workflow[1].
References:
[1] RSC Adv. 2022 Sep 7; 12 (39):25528-25548.
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Metabolic flux analysis: MFA (1317)
- Formula: 13C6H12O6
- Molecular Weight: 186.11
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- Formula: 13C16H32O2
- Molecular Weight: 272.31
Palmitic acid-13C16 is the 13C-labeled Palmitic acid. Palmitic acid is a long-chain saturated fatty acid commonly found in both animals and plants. PA can induce the expression of glucose-regulated protein 78 (GRP78) and CCAAT/enhancer binding protein homologous protein (CHOP) in in mouse granulosa cells.
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- Formula: 13C3H6O3
- Molecular Weight: 93.06
L-Lactic acid-13C3 is a 13C-labeled L-Lactic acid (HY-Y0479). L-Lactic acid-13C3 can be used for lactate metabolism research.
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- Formula: 13C6H15Cl15N4O2
- Molecular Weight: 220.59
L-Arginine-13C6,15N4 (hydrochloride) is the 13C- and 15N-labeled L-Arginine hydrochloride. L-Arginine hydrochloride ((S)-(+)-Arginine hydrochloride) is the nitrogen donor for synthesis of nitric oxide, a potent vasodilator that is deficient during times of sickle cell crisis.
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- Formula: 13C18H34O2
- Molecular Weight: 300.33
Oleic acid-13C18 is the 13C labeled Oleic acid (HY-N1446). Oleic acid (9-cis-Octadecenoic acid) is an abundant monounsaturated fatty acid. Oleic acid is a Na+/K+ ATPase activator.
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- Formula: C5H4N215N2O3
- Molecular Weight: 170.10
Uric acid-15N2 is the 15N-labeled Uric acid (HY-B2130). Uric acid is an orally active oxygen free radical scavenger that helps maintain stable blood pressure and combat oxidative stress. Uric acid can scavenge ROS, such as singlet oxygen and peroxynitrite, and inhibit lipid peroxidation. Uric acid can be used as a modeling agent in research on hyperuricemia-induced hypertension models.
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- Formula: 13C7H17Cl15N4O2
- Molecular Weight: 235.61
H-HomoArg-OH-13C7,15N4 hydrochloride (L-Homoarginine-13C7,15N4 hydrochloride) is the 15N, 13C-labeled H-HomoArg-OH (hydrochloride) (HY-W012340). H-HomoArg-OH hydrochloride (L-Homoarginine hydrochloride) is an orally active endogenous non-protein amino acid. H-HomoArg-OH hydrochloride acts as a weak alternative substrate for NOS and interferes with NO production, selectively inhibits tissue-nonspecific alkaline phosphatase (TNAP), and suppresses the uptake of arginine by y+-type transporters (system y+). H-HomoArg-OH hydrochloride increases tissue hArg concentrations in vivo, regulates amino acid homeostasis, and improves renal function and pathological features of diabetic nephropathy. H-HomoArg-OH hydrochloride can be used in studies related to diabetes and cardiomyopathy.
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- Formula: 13C6H14Cl15NO5
- Molecular Weight: 222.58
Glucosamine-13C6,15N hydrochloride is the 13C and 15N labeled Glucosamine hydrochloride. Glucosamine hydrochloride (D-Glucosamine hydrochloride) is an amino sugar and a prominent precursor in the biochemical synthesis of glycosylated proteins and lipids.
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- Formula: C5H10N15NO3
- Molecular Weight: 147.14
L-Glutamine-15N is the 15N-labeled L-Glutamine (HY-N0390). L-Glutamine is an orally active nutritional agent and cellular metabolism regulator. L-Glutamine is taken up in a Na+-dependent manner and targets multiple key molecules including glutaminase, mTORC1, NF-κB, STAT-3 and HIF-1α. L-Glutamine enhances glutaminolytic catabolism, drives the conversion of glutamate to α-ketoglutarate, thereby regulating gene expression, integrating metabolic signals, mediating glutamine flux and maintaining redox homeostasis. L-Glutamine also promotes cell proliferation, osteogenic differentiation and fracture healing, exerts neuroprotective and cardioprotective effects, and inhibits osteoarthritis. L-Glutamine can be applied to research related to osteoporosis, osteoarthritis, ischemic stroke and acute cantharidin-induced cardiotoxicity.
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- Formula: C5H1015N2O3
- Molecular Weight: 148.13
L-Glutamine-15N2 is the 15N-labeled L-Glutamine (HY-N0390). L-Glutamine is an orally active nutritional agent and cellular metabolism regulator. L-Glutamine is taken up in a Na+-dependent manner and targets multiple key molecules including glutaminase, mTORC1, NF-κB, STAT-3 and HIF-1α. L-Glutamine enhances glutaminolytic catabolism, drives the conversion of glutamate to α-ketoglutarate, thereby regulating gene expression, integrating metabolic signals, mediating glutamine flux and maintaining redox homeostasis. L-Glutamine also promotes cell proliferation, osteogenic differentiation and fracture healing, exerts neuroprotective and cardioprotective effects, and inhibits osteoarthritis. L-Glutamine can be applied to research related to osteoporosis, osteoarthritis, ischemic stroke and acute cantharidin-induced cardiotoxicity.
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- Formula: C513C5H13N5O4
- Molecular Weight: 272.20
Adenosine-13C5 is the 13C labeled Adenosine. Adenosine (Adenine riboside), a ubiquitous endogenous autacoid, acts through the enrollment of four G protein-coupled receptors: A1, A2A, A2B, and A3. Adenosine affects almost all aspects of cellular physiology, including neuronal activity, vascular function, platelet aggregation, and blood cell regulation.
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- Formula: 13C6H15ClN4O2
- Molecular Weight: 216.62
L-Arginine-13C6 (hydrochloride) is the 13C-labeled L-Arginine hydrochloride. L-Arginine hydrochloride ((S)-(+)-Arginine hydrochloride) is the nitrogen donor for synthesis of nitric oxide, a potent vasodilator that is deficient during times of sickle cell crisis.
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- Formula: 13C5H6O5
- Molecular Weight: 151.06
2-Ketoglutaric acid-13C5 (Alpha-Ketoglutaric acid-13C5) is a 13C labeled 2-Ketoglutaric acid (HY-W013636). 2-Ketoglutaric acid (Alpha-Ketoglutaric acid) is an intermediate in the production of ATP or GTP in the Krebs cycle. 2-Ketoglutaric acid also acts as the major carbon skeleton for nitrogen-assimilatory reactions. 2-Ketoglutaric acid is a reversible inhibitor of tyrosinase (IC50=15 mM).
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- Formula: ClH415N
- Molecular Weight: 54.48
Ammonium chloride-15N is the 15N labeled Ammonium chloride (HY-Y1269). Ammonium chloride, as a heteropolar compound with pH value regulation, can cause intracellular alkalization and metabolic acidosis thus effecting enzymatic activity and influencing the process of biological system. Ammonium chloride is an autophagy inhibitor. Ammonium chloride is also a lysosome inhibitor.
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- Formula: 13C3H7NO3
- Molecular Weight: 108.07
L-Serine-13C3 is the 13C-labeled L-Serine. L-Serine ((-)-Serine; (S)-Serine), one of the so-called non-essential amino acids, plays a central role in cellular proliferation.
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- Formula: 13C3H3NaO3
- Molecular Weight: 113.02
Sodium 2-oxopropanoate-13C3 is the 13C-labeled Sodium 2-oxopropanoate. Sodium 2-oxopropanoate (Sodium pyruvate), a three-carbon metabolite of Glucose, is a compound produced in the glycolytic pathway. Sodium 2-oxopropanoate is a free radical scavenger that can scavenge ROS.
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- Formula: 13C3H5NaO3
- Molecular Weight: 115.04
L-Lactic acid-13C3 ((S)-2-hydroxypropanoic-13C3) sodium (20% in water) is the 13C labeled L-Lactic acid. L-Lactic acid-13C3 sodium (20% in water) can be used for lactate metabolism research.
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- Formula: 13C6H15Cl15N2O2
- Molecular Weight: 190.59
L-Lysine-13C6,15N2 (hydrochloride) is the 13C- and 15N-labeled L-Lysine hydrochloride. L-lysine hydrochloride is an essential amino acid for humans with various benefits including treating herpes, increasing calcium absorption, reducing diabetes-related illnesses and improving gut health.
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- Formula: 13C11H12N2O2
- Molecular Weight: 215.14
L-Tryptophan-13C11 is the 13C-labeled L-Tryptophan. L-Tryptophan (Tryptophan) is an essential amino acid that is the precursor of serotonin, melatonin, and vitamin B3.
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- Formula: 13C4H6O4
- Molecular Weight: 122.06
Succinic acid-13C4 is the 13C labeled Succinic acid. Succinic acid is a potent and orally active anxiolytic agent. Succinic acid is an intermediate product of the tricarboxylic acid cycle. Succinic acid can be used as a precursor of many industrially important chemicals in food, chemical and pharmaceutical industries.
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