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Related Experiment Videos

In vitro substrate utilization for lipid synthesis in liver explants from hyperthyroid chickens

R W Rosebrough1

  • 1Nonruminant Animal Nutrition Laboratory, Beltsville Agricultural Research Center, MD 20705.

Comparative Biochemistry and Physiology. Comparative Physiology
|December 1, 1993
PubMed
Summary

Low dietary protein and triiodothyronine (T3) impact broiler chicken lipogenesis. T3 increased CO2 production, suggesting altered energy metabolism, while low protein diets enhanced lipid synthesis.

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Area of Science:

  • Animal Nutrition
  • Biochemistry
  • Metabolic Physiology

Background:

  • Lipogenesis is a key metabolic process in broiler chickens, influencing growth and meat quality.
  • Dietary protein and thyroid hormones like triiodothyronine (T3) are known regulators of intermediary metabolism.

Purpose of the Study:

  • To investigate the energetic costs of lipogenesis in broiler chickens fed varying protein levels and supplemented with T3.
  • To determine the utilization of different substrates for in vitro lipogenesis under these dietary conditions.

Main Methods:

  • Broiler chickens were fed diets with 12-30% protein, with or without 1 mg/kg T3.
  • In vitro lipogenesis and CO2 production were measured using radiolabeled pyruvate, acetate, and alanine.
  • Mitochondrial oxygen consumption was assessed to evaluate energetic costs.

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Main Results:

  • A 12% protein diet significantly increased lipogenesis and CO2 production from [1-14C]pyruvate.
  • T3 supplementation increased CO2 production from all substrates, indicating enhanced catabolism, but reduced carbon flux into lipids.
  • T3 did not alter mitochondrial respiration rates, suggesting its effects on metabolism occur independently of mitochondrial function.

Conclusions:

  • Dietary protein level and T3 influence de novo lipogenesis and substrate utilization in broiler chickens.
  • Coenzyme A availability may be a regulatory factor in de novo lipogenesis.
  • T3's effects on intermediary metabolism might involve non-mitochondrial pathways.