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Human whole-body copper metabolism

J R Turnlund1

  • 1US Department of Agriculture, Agricultural Research Service, Western Human Nutrition Research Center, San Francisco, CA 94129, USA. jturnlund@whnrc.usda.gov

The American Journal of Clinical Nutrition
|May 20, 1998
PubMed
Summary

Studying whole-body copper metabolism in humans is challenging. Isotopic tracers and kinetic modeling reveal that copper absorption efficiency and endogenous excretion regulate body copper levels, though regulation is imperfect at very low or high intakes.

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Area of Science:

  • Human physiology
  • Nutritional biochemistry
  • Trace element metabolism

Background:

  • Whole-body copper metabolism is complex and difficult to study directly in humans.
  • Existing knowledge of copper homeostasis mechanisms is limited.
  • Understanding copper regulation is crucial for preventing deficiencies and toxicities.

Purpose of the Study:

  • To investigate the mechanisms regulating whole-body copper metabolism in humans.
  • To elucidate the roles of copper absorption and endogenous excretion in maintaining copper balance.
  • To assess the effectiveness of regulatory mechanisms under varying dietary copper intakes.

Main Methods:

  • Utilized isotopic tracers to track copper movement within the body.
  • Applied kinetic modeling to analyze tracer data and quantify metabolic processes.
  • Examined copper absorption efficiency and endogenous excretion in relation to dietary copper intake.

Main Results:

  • Copper absorption efficiency significantly varies with dietary copper intake.
  • Endogenous copper excretion adjusts in response to absorbed copper, acting as a regulatory mechanism.
  • Regulatory mechanisms appear insufficient at very low dietary copper (0.38 mg/d) and delayed at high intakes.

Conclusions:

  • Copper homeostasis is maintained through dynamic regulation of absorption and excretion.
  • Isotopic tracers and kinetic modeling are valuable tools for studying human copper metabolism.
  • Further research is needed to fully understand and optimize copper regulatory mechanisms.

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