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Inter-organ leptin exchange in humans

G Garibotto1, R Russo, R Franceschini

  • 1Department of Internal Medicine, Genoa University, Genoa, Italy.

Biochemical and Biophysical Research Communications
|June 27, 1998
PubMed
Summary
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Splanchnic organs and kidneys clear leptin, while peripheral tissues release it. Kidney leptin removal depends on renal plasma flow, not filtration, in non-obese individuals.

Area of Science:

  • Endocrinology
  • Metabolism
  • Renal Physiology

Background:

  • Leptin, a key hormone in energy balance, has its metabolism influenced by various organs.
  • Understanding the specific roles of splanchnic organs, kidneys, and peripheral tissues in leptin disposal is crucial for metabolic research.

Purpose of the Study:

  • To delineate the individual contributions of splanchnic organs, kidneys, and peripheral tissues to overall leptin metabolism.
  • To investigate the mechanisms of renal leptin clearance in non-obese subjects.

Main Methods:

  • Arterio-venous technique used to measure leptin exchange across the splanchnic bed, kidney, and leg.
  • Analysis of leptin levels in arterial, hepatic venous, renal venous, and femoral venous blood.
  • Assessment of fractional leptin extraction and urinary leptin excretion.

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Main Results:

  • Leptin levels were lower in hepatic and renal veins compared to arterial blood, indicating organ uptake.
  • Femoral vein leptin levels were higher than arterial, suggesting peripheral leptin addition to circulation.
  • Splanchnic organs exhibited higher fractional leptin extraction (16%) than the kidneys (9.5%).
  • Renal leptin clearance correlated with renal plasma flow but not glomerular filtration rate.
  • Urinary leptin excretion was largely undetectable, suggesting intrarenal degradation.

Conclusions:

  • Both splanchnic organs and kidneys actively participate in leptin disposal.
  • Peripheral tissues contribute to circulating leptin levels.
  • Kidney function significantly impacts whole-body leptin clearance, influenced by renal plasma flow.