Biochemical methods for measuring metabolic fitness of tissues or whole organisms
First Claim
1. A method for assessing metabolic fitness or aerobic demand of a living system, comprising:
- a) administering 2H2O to the living system in a manner sufficient to achieve a 2H2O enrichment level of 0.5% to 15% of the total water in the living system;
b) allowing sufficient time for the 2H label to be incorporated into a mitochondrial molecule in the living system;
c) measuring the isotopic content, isotopic pattern, rate of change of isotopic content, or rate of change of the isotopic pattern, of the mitochondrial molecule; and
c) calculating the rate of synthesis or degradation of the mitochondrial molecule to assess the metabolic fitness or the aerobic demand of the living system.
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Abstract
The present invention relates to biochemical methods for assessing metabolic fitness and/or aerobic demands of a living system. Specifically, the rate of synthesis and turnover of the molecular components of mitochondrial mass are used to determine the aerobic capacity and/or aerobic demand of tissues or living organisms. The direct measurement of metabolic fitness and/or aerobic demand by this means can be used as an index of the efficacy of an exercise training program or other therapeutic intervention; as a medical risk factor for predicting the risk of cardiovascular disease, diabetes, death or other health outcome; or as an aid to pharmaceutical companies for drug discovery in the area of metabolic fitness, deconditioning, and oxidative biology.
128 Citations
27 Claims
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1. A method for assessing metabolic fitness or aerobic demand of a living system, comprising:
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a) administering 2H2O to the living system in a manner sufficient to achieve a 2H2O enrichment level of 0.5% to 15% of the total water in the living system;
b) allowing sufficient time for the 2H label to be incorporated into a mitochondrial molecule in the living system;
c) measuring the isotopic content, isotopic pattern, rate of change of isotopic content, or rate of change of the isotopic pattern, of the mitochondrial molecule; and
c) calculating the rate of synthesis or degradation of the mitochondrial molecule to assess the metabolic fitness or the aerobic demand of the living system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for assessing deconditioning of a living system, comprising:
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a) administering an isotopically labeled precursor molecule to the living system;
b) allowing for a period of time sufficient for the label of the isotopically labeled precursor molecule to be incorporated into a mitochondrial molecule in the living system;
c) measuring the isotopic content, isotopic pattern, rate of change of isotopic content, or rate of change of isotopic pattern of the isotopically labeled precursor molecule in the living system; and
d) calculating the rate of synthesis or degradation of the isotopically labeled precursor molecule to assess the initial metabolic fitness or aerobic demand of the living system;
e) subjecting the living system to a deconditioning event, resulting in a deconditioned living system;
f) administering the isotopically labeled precursor molecule to the deconditioned living system;
g) allowing for a period of time sufficient for the label of the isotopically labeled precursor molecule to be incorporated into a mitochondrial molecule in the deconditioned living system;
h) measuring the isotopic content, isotopic pattern, rate of change of isotopic content, or rate of change of isotopic pattern of the isotopically labeled precursor molecule in the deconditioned living system; and
i) calculating the rate of synthesis or degradation of the isotopically labeled precursor molecule to assess the deconditioning of the deconditioned living system. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An isolated, 2H labeled mitochondrial molecule with its 2H label derived from 2H labeled water (2H2O), wherein said isolated, 2H labeled mitochondrial molecule is produced by:
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a) administering the 2H2O to a living system wherein said 2H2O is labeled with a detectable amount of 2H, wherein the 2H is incorporated into the mitochondrial molecule of the living system; and
b) isolating said 2H labeled mitochondrial molecule, wherein the isolated, 2H labeled mitochondrial molecule is a molecule selected from the group consisting of DNA, RNA, a subunit of cytochrome c oxidase, a subunit of F0 ATPase, a subunit of F1 ATPase, a subunit of cytochrome c reductase, a subunit of NADH-CoQ reductase, cardiolipin, phosphatidylcholine, and phosphatidylethanolamine.
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27. A kit for assessing the metabolic fitness or aerobic demand of a living system, the kit comprising:
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a) 2H2O, and b) instructions for use of the kit, wherein the kit is used to assess the metabolic fitness or aerobic demand of a living system.
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Specification