Alcohol dehydrogenase I expression correlates with CDR1, CDR2 and FLU1 expression in Candida albicans from patients with vulvovaginal candidiasis

作者：Guo Hui; Zhang Xiao-li; Gao Lai-qiang; Li Shui-xiu; Song Yan-jun; Zhang Hong^*

来源：Chinese Medical Journal, 2013, 126(11): 2098-2102.

DOI：10.3760/cma.j.issn.0366-6999.20123605

• alcohol dehydrogenase I
• CDR1
• CDR2
• FLU1
• azoleresi-stance

Background The most critical mechanism governing drug resistance in Candida alb/cans (C. alb/cans) involves efflux pumps, the functionality of which largely depends on energy metabolism. Alcohol dehydrogenase I (ADH1) plays an important role in intracellular energy metabolism. The aim of this study was to explore the relationshipbetween ADH1 and drug resistance in C. albicans.
Methods Twenty clinical C. albicans samples isolated from individual patients diagnosed with vulvovaginal candidiasis, and two C. alb/cans strains obtained from a single parental source (the fluconazole (FLC)-sensitive strain CA-1(S) and the FLC-resistant strain CA-16(R)) were included in our study. In accordance with the Clinical and Laboratory Standards Institute (CLSI) M27-A3 guidelines, we used the microdilution method to examine the FLC minimum inhibitory concentrations (MICs) and real-time reverse transcription polymerase chain reaction (RT-PCR) to measure the mRNA expression levels of ADH1 and the azole resistance genes CDR1, CDR2, MDR1, FLU1 and ERG11 in all the isolates.
Results A highly significant positive correlation between the mRNA levels of ADH1 and the MICs (r(s) =0.921, P=0.000), as well as positive correlations between the mRNA level of ADH1 and those of CDR1, CDR2 and FLU1 (r(s) of 0.704, 0.772 and 0.779, respectively, p<0.01), were observed in the 20 clinical C. albicans samples. The relative expression of ADH1 was upregulated 10.63- to 17.61-fold in all of the drug-resistant isolates. No correlations were found between the mRNA levels of ADH1 and those of MDR1 or ERG11 (p>0.05). The mRNA levels of the examined drug resistance genes were higher in the CA-16(R) strain than in CA-18, and the mRNA levels of ADH1 in CA-16(R) were 11.64-fold higher than those in CA-1(S) (p<0.05).
Conclusions These results suggest that high levels of ADH1 transcription are implicated in FLC resistance in C. albicans and that the mRNA expression levels of ADH1 are positively correlated with those of CDR1, CDR2 and FLU1.

• 出版日期2013-6-5
• 单位暨南大学