Abstract
Background
Osteomyelitis caused by Methicillin-resistant Staphylococcus aureus (MRSA) often requires surgery and prolonged systemic antibiotic treatment. Local antibiotic delivery systems of bioceramics or polymers have been developed to treat osteomyelitis. A disadvantage of biodegradable polymers is the initial burst of antibiotics into the environment; one advantage of bioceramics is its osteoconductivity. We therefore developed a vancomycin-containing poly-l-lactic acid/β-tricalcium phosphate (PLLA/β-TCP) composite to control antibiotic release and stimulate bone formation.
Questions/purposes
We (1) characterized these composites, (2) assessed vancomycin release in inhibitory doses, and (3) determined whether they would permit cell adhesion, proliferation, and mineralization in vitro.
Methods
We molded 250 vancomycin-containing (VC) and 125 vancomycin-free (VUC) composites using PLLA, β-TCP, and chloroform. One hundred twenty-five VC composites were further dip-coated with PLLA (CVC) to delay antibiotic release. Composites were characterized according to their pore structure, size, volume, density, and surface area. Vancomycin release and bioactivity were determined. Adhesion, proliferation, and mineralization were assessed for two and three replicates on Days 3 and 7 with mesenchymal stem (MSC) and Saos type 2 cells.
Results
Pore size, volume, apparent density, and surface area of the CVC were 3.5 ± 1.9 μm, 0.005 ± 0.002 cm3/g, 1.18 g/cm3 and 3.68 m2/g, respectively. CVC released 1.71 ± 0.13 mg (63.1%) and 2.49 ± 0.64 mg (91.9%) of its vancomycin on Day 1 and Week 6, respectively. MSC and Saos type 2 cells attached and proliferated on composites on Days 3 and 7.
Conclusions
Vancomycin-containing PLLA/β-TCP composites release antibiotics in inhibitory doses after dip coating and appeared biocompatible based on adhesion, proliferation, and mineralization.
Clinical Relevance
Vancomycin-containing PLLA/β-TCP composites may be useful for controlling MRSA but will require in vivo confirmation.
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Acknowledgments
We thank Muharrem Timuçin and Nursen Koç of Middle East Technical University, Department of Metallurgical and Material Engineering, Ankara, Turkey, who produced and provided the β-TCP. We also thank Duygu Uçkan, MD, PhD, of Hacettepe University, Faculty of Medicine, Department of Pediatrics Bone Marrow Transplantation Unit, Ankara, Turkey, for designing and interpreting the results of the in vitro study; Bülent Gümusel, PhD, of Hacettepe University, Faculty of Pharmacy, Department of Pharmacology, Ankara, Turkey, for directing the vancomycin release studies, and Kemal Behlulgil, PhD, of Middle East Technical University Central Laboratory for characterizing the composites.
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This study was performed at Middle East Technical and Hacettepe Universities of Ankara, Turkey.
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Kankilic, B., Bayramli, E., Kilic, E. et al. Vancomycin Containing PLLA/β-TCP Controls MRSA In Vitro. Clin Orthop Relat Res 469, 3222–3228 (2011). https://doi.org/10.1007/s11999-011-2082-9
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DOI: https://doi.org/10.1007/s11999-011-2082-9