Abstract
Background
Hyperglycemia is a risk factor for nosocomial infections with known host effects. Increased glucose levels also increase pathogenicity of infecting microbes through greater biofilm formation. The dose response of biofilm formation to glucose concentration is not known.
Questions/purposes
We asked: What is the relationship between the amount of biofilm formed by Staphylococcus epidermidis and Staphylococcus aureus and change in glucose concentration in the clinically important range of 20 to 300 mg/dL?
Methods
This experiment studied biofilm formation by S epidermidis and S aureus in Lennox broth medium supplemented with increasing glucose concentrations from 0 to 320 mg/dL in 20 mg/dL intervals. Biofilm was grown for 24 hours for S epidermidis and 48 hours for S aureus. Biofilms were heat fixed, stained with 0.1% crystal violet, and washed with deionized water. The dye was then extracted with 30% acetic acid. Visual light absorption of the extracted crystal violet dye at 600 nm was used to quantify the biofilm biomass. The effect of glucose concentration on the amount of biofilm mass produced was analyzed using ANOVA and Tukey’s test.
Results
Biofilm mass was increased at higher glucose concentration for both species with a threshold response at 0 to 20 and 160 to 200 mg/dL for S epidermidis and 200 to 240 mg/dL for S aureus.
Conclusions
Increased biofilm growth by S aureus and S epidermidis has a threshold response at clinically important concentrations.
Clinical Relevance
Postoperative hyperglycemia may increase the risk for implant infection through increased pathogenicity of intraoperative wound contaminants in addition to compromising host immune status.
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Each author certifies that he or she, or a member of his or her immediate family, has no funding or commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.”
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This work was performed at Banner Good Samaritan Medical Center, Phoenix, AZ, USA, and at Arizona State University, Tempe, AZ, USA.
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Waldrop, R., McLaren, A., Calara, F. et al. Biofilm Growth Has a Threshold Response to Glucose in Vitro. Clin Orthop Relat Res 472, 3305–3310 (2014). https://doi.org/10.1007/s11999-014-3538-5
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DOI: https://doi.org/10.1007/s11999-014-3538-5