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Human bone collagen synthesis is a rapid, nutritionally modulated process.

John A Babraj1, Kenneth Smith, Daniel J R Cuthbertson

  • 1Division of Molecular Physiology, School of Life Sciences, University of Dundee, Dundee, Scotland.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|May 11, 2005
PubMed
Summary

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Directly measuring human bone collagen synthesis reveals it is faster than previously thought and significantly increases with feeding. This new method offers insights into bone collagen turnover regulation.

Area of Science:

  • Biochemistry
  • Physiology
  • Nutrition Science

Background:

  • Current methods for assessing bone collagen turnover are indirect, relying on collagen markers.
  • A direct method for measuring human bone collagen synthesis is needed to study its physiology and pathology.

Purpose of the Study:

  • To develop a direct assay for human bone collagen synthesis.
  • To determine the effects of feeding on bone collagen synthesis in young healthy men.

Main Methods:

  • Administered flooding doses of labeled proline ([13C] or [15N]) over 2 hours to label iliac crest bone collagen.
  • Quantified collagen synthesis rate by measuring labeled hydroxyproline in extracted collagen and comparing it to plasma proline labeling.
  • Investigated the impact of intravenous nutrition on collagen synthesis in a separate group.

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Main Results:

  • Bone collagen synthesis rate was determined to be approximately 0.066%/h, faster than previously assumed.
  • Intravenous feeding stimulated bone collagen synthesis by approximately 66% within 4 hours.
  • Identified heterogeneous collagen pools in human iliac crest bone with varying synthesis rates.

Conclusions:

  • Human bone collagen synthesis is more rapid than generally assumed, comparable to muscle protein turnover.
  • Feeding significantly enhances bone collagen synthesis, indicating its responsiveness to nutritional status.
  • The developed direct assay provides a novel approach for studying bone collagen turnover regulation.