RT Journal Article
T1 In vitro interference of tigecycline at subinhibitory concentrations on biofilm development by Enterococcus faecalis
A1 Maestre, Juan Ramón
A1 Aguilar, Lorenzo
A1 Mateo, María
A1 Giménez, María José
A1 Mendez, María Luisa
A1 Alou Cervera, Luis
A1 Granizo, Juan José
A1 Prieto Prieto, José
AB Objectives: Since biofilm formation is the hallmark of Enterococcus faecalis isolates, the aim of this study was to quantify biofilm formation in the presence of subinhibitory concentrations of tigecycline.Methods: Interference of tigecycline on biofilm formation was spectrophotometrically quantified using 20 biofilm-producing E. faecalis isolates with tigecycline MICs of 0.12 (8 strains) or 0.25 mg/L (12 strains). Biofilm production was measured in antibiotic-free tryptic soy broth supplemented with 1% glucose and compared with biofilm production in the same medium with tigecycline at subinhibitory concentrations (0.25× or 0.5× MIC, similar to trough concentrations in serum or concentrations in the colon after a standard dose) by reading the optical density at 450 nm (OD(450)) after staining with Crystal Violet.Results: In the presence of subinhibitory tigecycline concentrations, pooled OD(450) values for the 20 strains [median (IQR)] were significantly lower than those for controls: 0.468 (0.379-0.516) for antibiotic-free controls versus 0.295 (0.200-0.395) for 0.25× MIC tigecycline (P < 0.001) and 0.287 (0.245-0.479) for 0.5× MIC tigecycline (P < 0.001), with significant differences between pooled OD(450) values obtained with each concentration of tigecycline (P = 0.022). In 17 out of 20 (85%) strains the OD(450) obtained with 0.25× MIC tigecycline was significantly (P < 0.05) lower than the basal OD(450), while this occurred in 12 out of 20 (60%) strains with 0.5× MIC.Conclusions: In vitro tigecycline subinhibitory concentrations were able to interfere with biofilm formation by E. faecalis.
PB Cambridge University Press
SN 0305-7453
YR 2012
FD 2012-02-09
LK https://hdl.handle.net/20.500.14352/107082
UL https://hdl.handle.net/20.500.14352/107082
LA eng
NO Maestre JR, Aguilar L, Mateo M, Giménez MJ, Méndez ML, Alou L, Granizo JJ, Prieto J. In vitro interference of tigecycline at subinhibitory concentrations on biofilm development by Enterococcus faecalis. J Antimicrob Chemother. 2012 May;67(5):1155-8.
NO Pfizer S.L.U.
DS Docta Complutense
RD 18 abr 2025