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Defective Bone Repair in C57Bl6 Mice With Acute Systemic Inflammation.

D A Behrends1,2, D Hui1,3, C Gao1,4

  • 1Bone Engineering Laboratories, Research Institute-McGill University Health Center, Montreal, QC, Canada.

Clinical Orthopaedics and Related Research
|November 16, 2016
PubMed
Summary
This summary is machine-generated.

Systemic inflammation, induced by lipopolysaccharide (LPS), significantly impairs bone healing in mice by hindering vascularization and altering bone cell activity. This preclinical finding supports clinical observations of poor bone repair in inflamed patients.

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Area of Science:

  • Orthopedics
  • Regenerative Medicine
  • Inflammation Research

Background:

  • Bone repair initiates with local inflammation.
  • Systemic inflammation is known to impair bone healing and cause malunion, but mechanisms are unclear.
  • This study investigates systemic inflammation's effect on the bone healing microenvironment.

Purpose of the Study:

  • To determine if systemic inflammation (lipopolysaccharide [LPS] administration) affects the quantity and quality of regenerating bone.
  • To assess if systemic inflammation alters vascularization, inflammatory cells, osteoblasts, and osteoclasts during bone healing.

Main Methods:

  • Cortical defects were created in mouse femurs and treated with LPS or saline (control).
  • Bone healing was analyzed at 1, 2, and 6 weeks post-surgery using microCT and histochemical analyses.
  • Quantified bone volume, microarchitecture, and cell activity (vascular endothelial cells, macrophages, osteoblasts, osteoclasts).

Main Results:

  • LPS-treated mice showed significantly less bone bridging (1/8 vs 7/9) and reduced bone volume (21% vs 39%) at 6 weeks.
  • Impaired healing correlated with decreased vascularization (CD34), osteoblast (ALP), and osteoclast (TRAP) activity.
  • Increased macrophage (F4/80) activity was observed in LPS-treated mice at 2 weeks.

Conclusions:

  • Systemic inflammation significantly reduces bone regeneration quantity and quality in a mouse model.
  • Impaired healing is linked to reduced revascularization, decreased bone turnover, and increased macrophage activity.
  • Findings support clinical observations and suggest potential therapeutic targets like VEGF or stem cells.