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Biofilm Growth Has a Threshold Response to Glucose in Vitro

  • Symposium: 2013 Musculoskeletal Infection Society
  • Published:
Clinical Orthopaedics and Related Research®

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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Authors and Affiliations

Authors

Corresponding author

Correspondence to Ryan McLemore PhD.

Additional information

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.”

All ICMJE Conflict of Interest Forms for authors and Clinical Orthopaedics and Related Research ® editors and board members are on file with the publication and can be viewed on request.

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

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