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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
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The systemic angiogenic response during bone healing.

Stefan Weiss1, Gerald Zimmermann, Thomas Pufe

  • 1Department of Orthopaedics, University of Heidelberg, Heidelberg, Germany.

Archives of Orthopaedic and Trauma Surgery
|November 28, 2008
PubMed
Summary
This summary is machine-generated.

Serum levels of angiogenic factors change during bone fracture healing. Specific early changes in basic fibroblast growth factor (bFGF) and platelet-derived growth factor AB (PDGF-AB) may predict fracture nonunion.

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Area of Science:

  • Orthopedics
  • Regenerative Medicine
  • Biochemistry

Background:

  • Bone healing involves complex angiogenesis regulated by cytokines.
  • Altered angiogenic factor concentrations may lead to delayed healing or nonunion.
  • Serum levels can reflect these systemic changes.

Purpose of the Study:

  • To investigate the time course of angiogenic cytokines during fracture healing.
  • To identify cytokine changes associated with fracture nonunion.
  • To assess early indicators of failed bone consolidation.

Main Methods:

  • Prospective collection of serum samples from 30 long bone fracture patients (15 union, 15 nonunion).
  • Matched patient groups based on healing outcomes 4 months post-surgery.
  • Quantification of angiogenin (ANG), angiopoietin 2 (Ang-2), basic fibroblast growth factor (bFGF), platelet-derived growth factor AB (PDGF-AB), pleiotrophin (PTN), and vascular endothelial growth factor (VEGF) via ELISA over 24 weeks.

Main Results:

  • Serum VEGF, bFGF, and PDGF were elevated in both healing and nonunion groups compared to controls, peaking early.
  • Significantly higher bFGF and PDGF-AB levels were observed in the union group at 2 and 4 weeks post-injury.
  • ANG and Ang-2 levels declined in healing fractures but showed no significant change in nonunion.
  • PTN levels increased over time in healing fractures but not in nonunion.

Conclusions:

  • Fracture healing is characterized by distinct systemic changes in specific angiogenic factors.
  • Early alterations in bFGF (2 weeks) and PDGF-AB (4 weeks) serum concentrations can indicate potential fracture nonunion.
  • These findings suggest potential biomarkers for predicting delayed bone healing.