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Heterogeneity of human bone.

J T Ninomiya1, R P Tracy, J D Calore

  • 1Department of Biochemistry, University of Vermont College of Medicine, Burlington.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|September 1, 1990
PubMed
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Cortical and trabecular bone exhibit distinct biochemical profiles, with differing levels of osteocalcin and osteonectin. These findings highlight the non-homogeneity of bone tissue and suggest tailored assessments for skeletal health.

Area of Science:

  • Biochemistry
  • Orthopedics
  • Skeletal Biology

Background:

  • The human skeleton comprises distinct bone types, primarily cortical and trabecular bone.
  • Understanding the biochemical composition of these bone types is crucial for assessing skeletal health and disease.
  • Soluble noncollagenous bone proteins, such as osteocalcin and osteonectin, are key biochemical markers.

Purpose of the Study:

  • To quantitatively compare the relative content of osteocalcin and osteonectin in human cortical and trabecular bone.
  • To determine if significant biochemical differences exist between these two major bone types.

Main Methods:

  • Matched bone samples from lumbar spine (cortical) and tibia (trabecular) were obtained from three adult males at autopsy.
  • Soluble noncollagenous bone proteins were extracted and assayed for osteocalcin and osteonectin content.

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  • Statistical analysis (analysis of variance) was used to assess the significance of observed differences.

    • Main Results:

    • Cortical bone demonstrated significantly higher levels of osteocalcin compared to trabecular bone (30- to 32-fold excess).
    • Trabecular bone showed significantly higher levels of osteonectin compared to cortical bone (21- to 47-fold excess).
    • These differences in protein concentration per gram of dried bone were statistically significant (P < 0.01).

    Conclusions:

    • The human skeleton is biochemically heterogeneous, with distinct profiles for cortical and trabecular bone.
    • These biochemical differences suggest potentially distinct regulatory mechanisms governing each bone type.
    • Caution is advised when using global soluble markers for skeletal function and quality assessments; differential assessments may be more appropriate.