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Related Experiment Videos

Local factors modulate tissue-specific NEFA utilization: assessment in rats using 3H-(R)-2-bromopalmitate.

S M Furler1, G J Cooney, B D Hegarty

  • 1Diabetes & Metabolism Research Program, Garvan Institute of Medical Research, Sydney, New South Wales, Australia. s.furler@garvan.unsw.edu.au

Diabetes
|September 2, 2000
PubMed
Summary

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This study used a novel fatty-acid tracer to measure nonesterified fatty acid (NEFA) uptake in rat tissues. Results show NEFA utilization is influenced by both systemic factors and local oxidation rates.

Area of Science:

  • Metabolic Physiology
  • Biochemistry
  • Endocrinology

Background:

  • Insulin resistance is linked to increased muscle lipid content, suggesting impaired lipid metabolism.
  • Understanding tissue-specific fatty acid uptake is crucial for metabolic research.

Purpose of the Study:

  • To quantify individual tissue nonesterified fatty acid (NEFA) uptake in rats under various metabolic conditions.
  • To investigate the influence of fasting, beta-oxidation blockade, and insulin on NEFA uptake and clearance.

Main Methods:

  • Utilized a novel fatty-acid tracer, [9,10-3H]-(R)-2-bromopalmitate (3H-R-BrP), in conscious male Wistar rats.
  • Administered tracer during fasting (5, 18, 36 h), etomoxir-induced beta-oxidation blockade, and insulin infusion.
  • Calculated NEFA clearance (K(f)*) and uptake (R(f)*) rates based on tissue tracer accumulation.

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Main Results:

  • Basal NEFA uptake correlated with tissue oxidative capacity (BAT > HRT > DPHM > RQ > WQ > WAT).
  • Fasting increased NEFA clearance in white adipose tissue (WAT) but elevated plasma NEFA levels, tending to increase uptake in most tissues.
  • Etomoxir reduced clearance in oxidative tissues; insulin decreased uptake in most tissues but increased it in WAT, BAT, and WQ.

Conclusions:

  • This is the first study to measure tissue-specific NEFA uptake in conscious rats across different metabolic states.
  • Tissue NEFA utilization is regulated by systemic availability and local factors, including early uptake and metabolic sequestration influenced by oxidation.