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Antibiotic-loaded bone cements, including poly(methyl methacrylate) (PMMA) and calcium sulfate (CaSO 4 ), are often used for treatment of orthopaedic infections involving  Staphylococcus  spp., although the effectiveness of this treatment modality may be limited due to the emergence of antimicrobial resistance and/or the development of biofilms within surgical sites. Gallium(III) is an iron analog capable of inhibiting essential iron-dependent pathways, exerting broad antimicrobial activity against multiple microorganisms, including  Staphylococcus  spp. Herein, we evaluated PMMA and CaSO 4  as carriers for delivery of gallium(III) nitrate (Ga(NO 3 ) 3 ) to infected surgical sites by assessing the release kinetics subsequent to incorporation and antimicrobial activity against  S. aureus  and  S. epidermidis . PMMA and to a lesser extent CaSO 4  were observed to be compatible as carriers for Ga(NO 3 ) 3 , eluting concentrations with antimicrobial activity against planktonic bacteria, inhibiting bacterial growth, and preventing bacterial colonization of beads, and effective against established bacterial biofilms of  S. aureus  and  S. epidermidis . Collectively, our  in vitro  results indicate that PMMA is a more suitable carrier compared to CaSO 4  for delivery of Ga(NO 3 ) 3 ; moreover they provide evidence for the potential use of Ga(NO 3 ) 3  with PMMA as a strategy for the prevention and/or treatment for orthopaedic infections.

biomed research international

An<i>In Vitro</i>Comparison of PMMA and Calcium Sulfate as Carriers for the Local Delivery of Gallium(III) Nitrate to Staphylococcal Infected Surgical Sites

AnIn VitroComparison of PMMA and Calcium Sulfate as Carriers for the Local Delivery of Gallium(III) Nitrate to Staphylococcal Infected Surgical Sites