Cited by 149Lipid metabolism and biosynthesisLipid metabolism and disordersDiabetes, Cardiovascular Risks, and Lipoproteins

Dose-dependent effect of insulin on plasma free fatty acid turnover and oxidation in humans

Bonadonna, R. C., Groop, L. C., Zych, K., Shank, M., DeFronzo, R. A.·1990·American Journal of Physiology-Endocrinology and Metabolism

Abstract

Methodology for measuring plasma free fatty acid (FFA) turnover/oxidation with [1-14C]palmitate was tested in normal subjects. In study 1, two different approaches (720-min tracer infusion without prime vs. 150-min infusion with NaH14CO3 prime) to achieve steady-state conditions of 14CO2 yielded equivalent rates of plasma FFA turnover/oxidation. In study 2, during staircase NaH14CO3 infusion, calculated rates of 14CO2 appearance agreed closely with NaH14CO3 infusion rates. In study 3, 300-min euglycemic insulin clamp documented that full biological effect of insulin on plasma FFA turnover/oxidation was established within 60-120 min. In study 4, plasma insulin concentration was raised to 14 +/- 2, 23 +/- 2, 38 +/- 2, 72 +/- 5, and 215 +/- 10 microU/ml. A dose-dependent insulin suppression of plasma FFA turnover/oxidation was observed. Plasma FFA concentration correlated positively with plasma FFA turnover/oxidation in basal and insulinized states. Total lipid oxidation (indirect calorimetry) was significantly higher than plasma FFA oxidation in the basal state, suggesting that intracellular lipid stores contributed to whole body lipid oxidation. Hepatic glucose production and total glucose disposal showed the expected dose-dependent suppression and stimulation, respectively, by insulin. In conclusion, insulin regulation of plasma FFA turnover/oxidation is maximally manifest at low physiological plasma insulin concentrations, and in the basal state a significant contribution to…

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Crossref · 10.1152/ajpendo.1990.259.5.e736

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Authors
Bonadonna, R. C., Groop, L. C., Zych, K., Shank, M., & DeFronzo, R. A.
Affiliations
The University of Texas at San Antonio Health Science Center (US)
Venue
American Journal of Physiology-Endocrinology and Metabolism
Published
1990-11-01
Volume
259
Issue
5
Pages
E736-E750
ISSN
  • 0193-1849 (ISSN-L)
  • 1522-1555
OpenAlex
W1872660062
Cited by
149
References
0
Citations by year
2025: 2 · 2024: 2 · 2023: 3 · 2022: 2 · 2021: 1 · 2019: 1 · 2018: 6 · 2017: 4 · 2016: 3 · 2014: 4 · 2013: 5 · 2012: 1
FWCI
3.38
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Endocrinology and Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (AM 24 092, 5r01am024092-06)
  • National Center for Research Resources (RR 125)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Lipid metabolism and disorders
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
Keywords
insulin, plasma free fatty acids, fatty acid turnover, fatty acid oxidation, lipid oxidation, hepatic glucose production, glucose disposal, hyperinsulinemic-euglycemic clamp
MeSH terms
Body Height, Body Weight, Calorimetry, Child, Dose-Response Relationship, Drug, Fatty Acids, Nonesterified, Female, Glucose, Humans, Insulin, Kinetics, Liver, Male, Oxidation-Reduction, Reference Values, Time Factors

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