Biofilm formation rate of Candida albicans strain and its sensitivity to antifungal agents
10.13699/j.cnki.1001-6821.2017.21.012
- VernacularTitle:白色念珠菌菌株的生物膜形成率及其对抗真菌类药物的敏感性
- Author:
Fu-Rong YING
1
;
Hua ZHU
;
Zhi-Chao ZHAO
;
Dong-Wei HU
;
Jia-Yu LV
;
Chao LIN
;
Wu ZHOU
;
Qing WU
;
Kai-Lin CHEN
;
Liang SHI
Author Information
1. 温州医科大学附属第一医院
- Keywords:
antifungal drugs;
Candida albican;
microbial biofilm;
recurrent vulvovaginal candidiasis
- From:
The Chinese Journal of Clinical Pharmacology
2017;33(21):2131-2134
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the biofilm formation rate of Candida albicans strain and its sensitivity to antifungal agents.Methods Candida albicans strains were isolated from 165 patients with vulvovaginal candidiasis (VVC) or recurrent vulvovaginal candidiasis (RVVC) in our hospital.The sensitivity of C.albicans strains to antifungal agents was evaluated by drug sensitivity test.And C54 strains for subsequent experiments in vivo and vitro were selected.Biofilms of single microbe or polymicrobial combination were induced in vitro,and their minimal inhibitory concentration (MIC) values were determined in free and biofilm patterns,respectively.C.albicans and mixed microbe suspensions were injected into mice to establish a model of VVC.Using ELIASA,OD595 values were determined to observe biofilm growth rates across groups.Results The largest number of itraconazole-resistant on C.albicans strains (4.20％).MIC values of all groups were higher in a free pattern than in a biofilm pattern.The polymicrobial biofilms formed by co-culture of fugal and bacterial strains were markedly resistant to various antifungal agents.Mter induction in the biofilm pattern,for C54 + Escherichia coli group,MIC values of resistance to amphotericin B,itraconazole,5-flucytosine and fluconazole were 512,＞256,＞512,and ＞ 1024 μg · mL-1;for C54 + Streptococcus agalactiae group,MIC values of resistance to above antifungal agents were ＞512,＞256,＞512,and ＞ 1024 μg · mL-1.The biofilm formation rate was significantly higher in vaginal samples isolated from the mice who were injected with mixed microbe suspension than those who were injected with standard C.albicans suspension (P ＜ 0.05).For ATCC14053 group,OD595 values were 0.20 ± 0.11,0.24 ± 0.024,0.25 ± 0.06 at 24,48 and 72 h,respectively;for C54 + E.coli group,OD595 values were 0.69 ±0.88,0.79 ±0.65,1.10 ±0.64 respectively;for C54 +S.agalactiae group,OD595 values were 0.68 ±0.42,0.81 ± 0.77,1.10 ± 0.10,respectively.Conclusion Polymicrobial biofilm formation can improve the biofilm formation rate of C.albicans and its resistance to antifungal agents and will enhance vaginal injury in patients with RVVC.
