Role of nanostructured lipid carriers in the expression alterations of ATP-binding cassette transporter genes in fluconazole-resistant Candida glabrata.

Introduction: This study was proposed to assess the potential role of efflux transporters in reversing fluconazole resistance in Candida glabrata isolates treated with fluconazole loaded nanostructured lipid carriers (FLZ-NLCs). Methods: The ultrasound technique was used to synthesize the FLZ-NLCs. Four fluconazole-resistant, as well as one susceptible standard C. glabrata isolates, were applied and exposed to FLZ/ FLZ-NLCs for 20 h at 37°C. Real-time PCRs were done to estimate the likely changes in ATP-binding cassette transporter genes. Results: Similar to the FLZ-exposed-susceptible standard strain which showed no alteration, the genes were not up-regulated significantly under the FLZ-NLCs treated condition. While they were over-expressed when the yeasts were treated with fluconazole. Conclusion: It is highly suggested that due to the nature of the NLCs which shields the whole conformation of the drug, FLZ is not recognized by the efflux transporter subunits and consequently the translocation would not happen.