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Original Articles

Supraphysiological Hyperinsulinemia Increases Plasma Leptin Concentrations After 4 h in Normal Subjects

  1. Tapio Utriainen,
  2. Raija Malmström,
  3. Sari Mäkimattila and
  4. Hannele Yki-Järvinen
  1. Department of Medicine, Division of Endocrinology and Diabetology, Helsinki University Central Hospital Helsinki, Finland
  1. Address correspondence and reprint requests to Dr. Hannele Yki-Jarvinen, Department of Medicine, Division of Endocrinology and Diabetology, University of Helsinki, Haartmaninkatu 4, FIN-00290 Helsinki, Finland.
Diabetes 1996 Oct; 45(10): 1364-1366. https://doi.org/10.2337/diab.45.10.1364
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Abstract

In rodents, food intake and insulin increase ob gene expression and circulating leptin concentrations, but it is unknown whether insulin regulates plasma leptin concentrations in humans. We measured plasma leptin concentrations in 27 normal subjects (16 men, 11 women; age, 24 ± 1 years; BMI, 22.6 ± 0.5 kg/m2; body fat, 18 ± 1%) during a 6-h euglycemic hyperinsulinemic clamp (sequential insulin infusions of 1, 2, and 5 mU.kg−1 · min−1 for 2 h each). During these insulin infusions, plasma leptin increased from a basal concentration of 7.4 ± 1.6 ng/ml by -2 ± 2, 17 ± 4, and 50 ± 6% to 7.2 ± 1.5 (NS vs. basal), 8.5 ± 1.7 (P < 0.001), and 10.4 ± 2.0 ng/ml (P < 0.001), respectively. Of the subjects, eight also participated in a control study where saline was infused for 6 h. In these subjects, plasma leptin increased by 5 ± 4, 26 ± 10, and 62 ± 10% during the insulin infusions, and decreased by 9 ± 4 (P = 0.07 for change during saline vs. insulin), 13 ± 4 (P < 0.01), and 17 ± 4% (P < 0.001) after 2, 4, and 6 h of the saline infusion, respectively. Women had higher plasma leptin concentrations basally and during hyperinsulinemia (P < 0.001) than men, but this difference was entirely accounted for by greater adiposity in women (22 ± 2 vs. 14 ± 1%, P < 0.001). These data provide evidence for the insulin regulation of plasma leptin concentrations in humans. This effect requires hours of high insulin concentrations, implying that postprandial satiety is not regulated via changes in plasma leptin concentrations. Insulin may, however, be of importance in the long-term or diurnal regulation of plasma leptin concentrations.

  • Received May 21, 1996.
  • Revision received May 23, 1996.
  • Accepted May 23, 1996.
  • Copyright © 1996 by the American Diabetes Association

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October 1996, 45(10)
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Supraphysiological Hyperinsulinemia Increases Plasma Leptin Concentrations After 4 h in Normal Subjects
Tapio Utriainen, Raija Malmström, Sari Mäkimattila, Hannele Yki-Järvinen
Diabetes Oct 1996, 45 (10) 1364-1366; DOI: 10.2337/diab.45.10.1364

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Supraphysiological Hyperinsulinemia Increases Plasma Leptin Concentrations After 4 h in Normal Subjects
Tapio Utriainen, Raija Malmström, Sari Mäkimattila, Hannele Yki-Järvinen
Diabetes Oct 1996, 45 (10) 1364-1366; DOI: 10.2337/diab.45.10.1364
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