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Gentamicin negatively influenced osteogenic function in vitro.

Akif Ince1, Norbert Schütze, Nadja Karl

  • 1Department of Orthopaedic Surgery, University Hospital Würzburg, Brettreichstr. 11, 97074 Würzburg, Germany. akif_ince@hotmail.com

International Orthopaedics
|May 20, 2006
PubMed
Summary

Local gentamicin delivery for open fractures may harm bone healing. High gentamicin concentrations reduced osteoblast viability and alkaline phosphatase activity in vitro, suggesting potential in vivo detriments.

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Area of Science:

  • Biomedical Engineering
  • Orthopedic Surgery
  • Cell Biology

Background:

  • Local gentamicin delivery is standard for preventing infection in open fracture surgery.
  • Previous studies on gentamicin's effects on osteoblasts used insufficient methodologies.

Purpose of the Study:

  • To investigate the in vitro effects of gentamicin on osteoblast viability, proliferation, alkaline phosphatase activity, and gene expression.
  • To assess the potential impact of locally delivered gentamicin on bone healing and repair.

Main Methods:

  • Utilized the C2C12 cell line, a well-characterized model for osteoblast differentiation.
  • Exposed cells to gentamicin concentrations ranging from 12.5 to 800 microg/ml for 48 hours.
  • Assessed cell viability, cell number, alkaline phosphatase activity, and expression of osteogenic genes (osterix, alkaline phosphatase).

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Main Results:

  • Gentamicin exposure (12.5-800 microg/ml) did not alter cell number but decreased cell viability by approximately one-third at concentrations of 200-800 microg/ml.
  • Significant reductions in alkaline phosphatase activity (one-third to one-half) were observed across all tested gentamicin concentrations.
  • Osteogenic gene expression (osterix, alkaline phosphatase) remained unaffected by gentamicin up to 800 microg/ml for 48 hours.

Conclusions:

  • High gentamicin concentrations, achievable through local delivery, negatively impact osteoblast viability and alkaline phosphatase activity in vitro.
  • These findings suggest that locally applied gentamicin may impede bone healing and repair in vivo.
  • Further research is warranted to optimize gentamicin delivery strategies for open fracture prophylaxis while minimizing adverse effects on bone regeneration.