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Osteoclasts prefer aged bone.

K Henriksen1, D J Leeming, I Byrjalsen

  • 1Pharmos Bioscience A/S & Nordic Bioscience A/S, Herlev, DK-2730, Denmark.

Osteoporosis International : a Journal Established As Result of Cooperation Between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA
|January 12, 2007
PubMed
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Osteoclasts, the cells responsible for bone breakdown, preferentially resorb aged bone. This indicates that the bone matrix itself guides targeted remodeling of older bones, crucial for maintaining bone health.

Area of Science:

  • Bone Biology
  • Skeletal Remodeling
  • Cellular Mechanisms

Background:

  • Osteoclasts are crucial for bone resorption, essential for repairing damage and maintaining bone quality.
  • The precise mechanisms by which osteoclasts target aged bone for remodeling remain largely unknown.
  • This study investigates the intrinsic ability of bone to direct osteoclastic resorption based on age.

Purpose of the Study:

  • To determine if bone age endogenously influences osteoclast resorption activity.
  • To elucidate the role of the bone matrix in directing targeted bone remodeling.
  • To understand the cellular and molecular cues bone provides to osteoclasts.

Main Methods:

  • Biochemical distinction of aged vs. young bone using the alphaCTX/betaCTX fragment ratio.

Related Experiment Videos

  • Assay of tartrate-resistant acid phosphatase (TRACP) activity and C-terminal telopeptide (CTX) release.
  • Quantification of osteoclastogenesis and resorption via TRACP-positive cell counts and pit area/number analysis.

    • Main Results:

    • Aged bone exhibits a lower alphaCTX/betaCTX ratio (3:1) compared to young bone.
    • Both alphaCTX and betaCTX fragments are released during osteoclast-mediated bone resorption.
    • Osteoclastogenesis and resorption are significantly augmented on aged bone, particularly under low serum conditions, independent of adhesion or morphology.

    Conclusions:

    • Bone age is a significant intrinsic factor controlling osteoclast-mediated resorption.
    • Osteoclasts exhibit enhanced differentiation and resorptive activity on aged bone compared to young bone.
    • The bone matrix actively participates in the targeted remodeling of aged skeletal elements.