Laboratory Medicine ›› 2020, Vol. 35 ›› Issue (7): 663-667.DOI: 10.3969/j.issn.1673-8640.2020.07.008

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Activity of pseudolaric acid B combined with fluconazole against Candida albican in vitro

LI Zhen, YIN Hongmei, CHEN Weiqin, XUE Yingjun, HU Jun, ZHU Bin, HU Xiaobo()   

  1. Department of Clinical Laboratory,Longhua Hospital,Shanghai University of Traditional Chinese Medicine,Shanghai 200032,China
  • Received:2019-08-26 Online:2020-07-30 Published:2020-08-04

Abstract:

Objective To evaluate the activity of pseudolaric acid B(PAB) combined with fluconazole against Candida albican in vitro,and to provide a reference for antifungal treatment. Methods Totally,33 isolates of fluconazole-susceptible and fluconazole-resistant Candida albican were collected. The minimum inhibitory concentrations(MIC) of PAB alone and in combination with fluconazole against Candida albican were determined by microdilution method and chequerboard microdilution method,respectively. The drug interactions were analyzed by fractional inhibitory concentration index(FICI). Time-kill curves were used to monitor dynamically the antifungal activity of PAB combined with fluconazole. Results When PAB used alone,it had similar antifungal effect on fluconazole-susceptible and fluconazole-resistant Candida albican with MIC 4-32 μg/mL. The combination of PAB and fluconazole increased the drug susceptibility of drug-resistant Candida albican. The MIC of fluconazole was decreased from ≥128 μg/mL to ≤16 μg/mL,and the MIC of PAB was decreased to ≤2 μg/mL. Synergism was observed in all 12 isolates of fluconazole-resistant Candida albican with FICI 0.035-0.188,10(47.62%) isolates of fluconazole-susceptible Candida albican showed synergistic effect(FICI 0.188-0.375),and the other 11 isolates of fluconazole-susceptible Candida albican displayed no interaction. Conclusions PAB can inhibit the growth of Candida albican,and shows synergistic effect when used in combination with fluconazole,especially for fluconazole-resistant Candida albican.

Key words: Pseudolaric acid B, Candida albican, Fluconazole, Drug resistance

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