Effects of hyperbaric oxygen and platelet derived growth factor on medial collateral ligament fibroblasts

Undersea Hyperb Med. May-Jun 2007;34(3):181-90.

Abstract

Purpose: This study investigated hyperbaric oxygen (HBO2) and platelet-derived growth factor-BB (PDGF-BB) to determine their combined effects on fibroblasts from rabbit medial collateral ligament (MCL).

Method: Cells were divided into four groups: (I) Control, (II) HBO2 treatment, (III) PDGF-BB treatment and (IV) HBO2 combined with PDGF-BB treatment. All hyperoxic cells were exposed to 100% O2 at 2.5 atmospheres absolute (ATA) in a hyperbaric chamber for 120 minutes per 48 hours. Measurement of cell growth was based on increase in cell number. Cell cycle modulations were analyzed by fluorescence-activated cell sorter (FACS). Quantity of Type I and Type III collagen was determined by western blotting and image analyzer.

Results: Treatment doses of HBO2 alone or PDGF-bb alone dependently increased cell growth. A combination of HBO2 treatment plus PDGF-bb treatment had an additive effect on cell growth in comparison with HBO2 treatment alone or PDGF-bb treatment alone. FACS analysis revealed that HBO2 alone, PDGF-bb alone and PDGF-bb plus HBO2 treatment increase the percentage of cells accumulated in S-phase. Western blotting analysis revealed that Type III collagen content was decreased significantly after HBO2 treatment alone or HBO2 plus PDGF-bb treatment but not in PDGF-bb treatment alone. In contrast, although Type I collagen content was increased after HBO2 treatment, the increase in Type I collagen (increase /original) was not statistically significant.

Conclusion: HBO2 or HBO2 plus PDGF-bb treatment decreases the Type III collagen/Type I collagen content, which could result in mechanically stronger collagen fibrils. We propose HBO2 therapy as a potentially effective treatment for MCL healing.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Becaplermin
  • Cell Cycle / drug effects
  • Cell Proliferation / drug effects
  • Cells, Cultured
  • Collagen Type I / metabolism
  • Collagen Type III / metabolism
  • Fibroblasts / cytology
  • Fibroblasts / drug effects*
  • Hyperbaric Oxygenation*
  • Medial Collateral Ligament, Knee / cytology*
  • Oxygen / pharmacology*
  • Platelet-Derived Growth Factor / pharmacology*
  • Proto-Oncogene Proteins c-sis
  • Rabbits

Substances

  • Collagen Type I
  • Collagen Type III
  • Platelet-Derived Growth Factor
  • Proto-Oncogene Proteins c-sis
  • Becaplermin
  • Oxygen