Synergistic Effects of Pulsed Lavage and Antimicrobial Therapy Against Staphylococcus aureus Biofilms in an in-vitro Model

Frontiers in Medicine

article

Hervé Poilvache¹  Albert Ruiz-Sorribas²  George Sakoulas⁴  Hector Rodriguez-Villalobos⁵  Olivier Cornu¹  Françoise Van Bambeke² 

[1] Laboratoire de Neuro-Musculo-Squelettique, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain;Laboratoire de Pharmacologie Cellulaire et Moléculaire, Louvain Drug Research Institute, Université Catholique de Louvain;Orthopaedic Surgery Department, Cliniques Universitaires Saint-Luc;School of Medicine, University of California, United States;Clinical Microbiology Department, Cliniques Universitaires Saint-Luc

关键词: biofilm;    MRSA;    MSSA;    pulsed lavage;    vancomycin;    flucloxacillin;    prosthetic joint infection;   

DOI  :  10.3389/fmed.2020.00527

学科分类：社会科学、人文和艺术（综合）

来源: Frontiers

【 摘 要 】

Background: Prosthetic joint infections (PJI) are difficult to treat complications of joint arthroplasty. Debridement with implant retention is a common treatment strategy and frequently involves the use of pulsed lavage (PL). However, PL effects on biofilms and antibiotic activity have been scarcely studied in-vitro . We report the effects of PL, vancomycin or flucloxacillin used independently or in combination against Staphylococcus aureus biofilms. Methods: Biofilms of 3 methicillin-susceptible (MSSA) and of 3 methicillin-resistant (MRSA) S. aureus were grown on Ti6Al4V coupons in TGN (TSB + 1%glucose + 2%NaCl). After 24 h, PL was applied to half of the samples (50 mL saline from 5 cm). Samples were either reincubated for 24 h in TGN or TGN + flucloxacillin or vancomycin. Analyses included CFUs counts, biomass assays or fluorescence microscopy. Results: PL transiently reduced bacterial counts by 3–4 Log 10 CFU/coupon, but bacterial regrowth to baseline levels was seen after 24 h. At 20 mg/L, flucloxacillin reduced both the CFU counts (3 Log 10 CFU/coupon) and biomass (−70%) in one MSSA only, while vancomycin had no effects against MRSA. PL combined with a 24 h reincubation with vancomycin or flucloxacillin at 20 mg/L was synergistic (−5 to 6.5 Log 10 CFU/coupon; 81–100% biomass reduction). Fluorescence microscopy confirmed that PL removed most of the biofilm and that subsequent antibiotic treatment partially killed bacteria. Conclusions: While PL only transiently reduces the bacterial load and antibiotics at clinically relevant concentrations show no or limited activity on biofilms, their combination is synergistic against MRSA and MSSA biofilms. These results highlight the need for thorough PL before antibiotic administration in PJI.

【 授权许可】

CC BY