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- W2040573864 abstract "TLR-9 ligand CpG oligodeoxynucleotide type B (CpG ODN) induces a proinflammatory environment. We evaluated the effects of a preoperative CpG ODN application in an implant-associated Staphylococcus aureus bone infection model by monitoring bacterial loads and cytokine and chemokine levels.A total of 95 rats were used in four different groups: CpG ODN group (group 1; n = 25), non-CpG-ODN group (group 2; n = 25); saline pretreatment (group 3; n = 25), and one uninfected group (group 4; n = 20). A single dose of CpG-ODN was administered to the left tibialis anterior muscle 3 days prior to surgery and the tibia midshaft was osteotomized, stabilized by an intramedullary implant and subsequently contaminated with 103 colony forming units (CFUs) of S. aureus in groups 1–3. The osteotomy gap in animals of group 4 was not contaminated with S. aureus and those animals did not receive any pretreatment.CpG ODN administration resulted in significant reduction of the bacterial load in tibia tissue homogenate and on the implant surface on day 1 post-infection compared to non-CpG-ODN pretreatment (p < 0.05; p < 0.05). Reductions in bacterial CFUs, compared to non-treated (saline) controls, were approximately 67% and 77% for bone tissue homogenates and implants. No bacteria were detected in uninfected rats. Early reduction of bacterial CFUs in the tibia was accompanied by increased levels of proinflammatory mediators MIP-2, IL-1β and RANTES in bone tissue milieu of the CpG ODN treated group compared to controls.At day 42 post-infection, bone marrow tissue of rats pretreated with CpG ODN had comparable high bacterial CFU numbers as the non-CpG ODN or saline treated groups. Microbiological analysis of implants removed from CpG ODN treated rats showed high bacterial growth densities on their surfaces which were not different from those observed in controls. In histology, all animals of groups 1–3 showed established infected non-unions. Additionally, inflammatory mediator profiles in bone marrow homogenates of CpG ODN treated rats resembled those seen in infected controls.In this rat model, prophylactic administration of a single dose of CpG ODN, resulted in marked reduction of S. aureus load in the infected tibia during the initial stage of infection but failed to prevent development of chronic infection over time." @default.
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- W2040573864 date "2007-01-01" @default.
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- W2040573864 title "CpG Induces Th1 Response in Neonatal Mice but Does Not Suppress Anaphylactic IgG1 Response: Possible Role of Low TLR-9 Expression" @default.
- W2040573864 doi "https://doi.org/10.1016/j.clim.2007.03.403" @default.
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