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Osteocalcin affects bone mineral and mechanical properties in female mice

O Berezovska1, G Yildirim1, W C Budell2

  • 1Department of Chemistry, Brooklyn College, Brooklyn, NY 11210, United States of America.

Bone
|August 12, 2019
PubMed

Insights

Osteocalcin deficiency in female mice on a pure B6 background led to weaker bones, contrasting previous studies. This suggests genetic background influences osteocalcin

Area of Science:

  • Bone biology
  • Genetics
  • Biochemistry

Background:

  • Osteocalcin is a key bone protein.
  • Its role in bone health varies by sex and genetic background.
  • Previous studies showed conflicting results in different mouse models.

Purpose of the Study:

  • Investigate osteocalcin's effect on female mouse bone properties on a pure C57BL/6J background.
  • Determine if osteocalcin deficiency impacts bone mineral density, strength, and turnover.
  • Clarify the role of osteocalcin in female bone health.

Main Methods:

  • Utilized Fourier Transform Infrared Imaging (FTIRI) and micro-computed tomography (uCT).
  • Performed biomechanical testing and histomorphometry.
  • Analyzed serum bone turnover markers (P1NP, CTX).

Main Results:

  • Osteocalcin-deficient (OC-/-) mice showed increased bone formation and immature mineral.
  • OC-/- mice exhibited decreased bone mineral density and reduced stiffness.
  • Bone strength was significantly lower in OC-/- mice compared to wild-type (OC+/+).

Conclusions:

  • Osteocalcin's role in bone strength is influenced by genetic background.
  • Osteocalcin deficiency in female B6 mice leads to weaker bone.
  • Reduced osteocalcin may contribute to bone weakness and fracture risk in certain human populations.
Keywords:
BiomechanicsFTIRIMicroCTOsteocalcin knock-out mouse

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