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Techniques for assessing protein and glucose kinetics

P J Garlick1, E Cersosimo

  • 1Department of Surgery, Health Sciences Center, State University of New York, Stony Brook 11794, USA.

Bailliere'S Clinical Endocrinology and Metabolism
|May 20, 1998
PubMed
Summary

Stable isotope tracers help understand substrate flow changes in disease. This review details methods for measuring glucose and protein kinetics, crucial for metabolic research.

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Area of Science:

  • Biochemistry
  • Medical Physiology
  • Metabolic Research

Background:

  • Pathological conditions like trauma alter substrate flow.
  • Understanding these changes is vital for effective treatment.
  • Isotopic labelling offers precise measurement techniques.

Purpose of the Study:

  • To review basic and advanced isotopic labelling techniques for measuring substrate flow.
  • To highlight applications in glucose and protein kinetics.
  • To explain methods for whole-body and regional metabolism assessment.

Main Methods:

  • Utilizing stable isotopes for substrate flow measurement.
  • Constant infusion of labelled glucose to assess glucose turnover and gluconeogenesis.
  • Arteriovenous balance of tracers and tracees for regional glucose metabolism.
  • Employing labelled amino acids (e.g., [1-13C]leucine) for protein turnover.
  • Assessing tissue protein synthesis via tracer incorporation in biopsy samples.
  • Comparing constant infusion versus flooding injection tracer administration.

Main Results:

  • Demonstrated the role of kidney gluconeogenesis in whole-body glucose metabolism.
  • Illustrated regional protein turnover measurement using labelled amino acids.
  • Provided examples of muscle protein synthesis studies in surgical patients.

Conclusions:

  • Isotopic labelling techniques are essential for quantifying substrate kinetics in health and disease.
  • These methods provide insights into glucose and protein metabolism at both systemic and regional levels.
  • The reviewed techniques aid in understanding metabolic responses to trauma and critical illness.

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