A novel polyamide SL-A92 as a potential fungal resistance blocker: synthesis and bioactivities in Candida albicans
作者:Shao-long Zhu、Zhi-hui Jiang、Ping-hui Gao、Yue Qiu、Liang Wang、Yuan-ying Jiang、Da-zhi Zhang
DOI:10.1038/aps.2010.59
日期:2010.7
To synthesize a novel polyamide SL-A92 and evaluate its bioactivity against drug resistance in Candida albicans. SL-A92 was synthesized using N-hydroxybenzotriazole (HOBT)/N,N'-dicyclohexylcarbodiimide (DCC) in solution phase. Its antifungal activities and effects on strain growth were tested using the micro-broth dilution method and growth curves, respectively. Induced drug resistance in the C. albicans collection strain SC5314 was obtained by incubation with fluconazole (12 μg/mL) for 21 passages. Meanwhile, incubations with SL-A92 plus fluconazole were also carried out in SC5314 strains, and the MIC80s were used to evaluate the inhibitory effects of SL-A92 on drug resistance during the induction process. Real time RT-PCR was performed to investigate the CDR1 and CDR2 mRNA levels in induced SC5314 strains. SC5314 strain induced by the combination of fluconazole and SL-A92 (200 μg/mL) did not develop drug resistance. On day 24, the CDR1 and CDR2 mRNA levels in SC5314 strain co-treated with fluconazole and SL-A92 relative to fluconazole alone were 26% and 24%, respectively, and on day 30 the CDR1 and CDR2 mRNA levels were 43% and 31%, respectively. SL-A92 can block the development of drug resistance during the fluconazole induction process, which partially results from the down-regulation of CDR1 and CDR2.
合成新型聚酰胺 SL-A92,并评估其对白色念珠菌耐药性的生物活性。SL-A92 采用 N-hydroxybenzotriazole (HOBT)/N,N'-dicyclohexylcarbodiimide (DCC) 在溶液相中合成。分别采用微滴稀释法和生长曲线测试了其抗真菌活性和对菌株生长的影响。将白僵菌菌株 SC5314 与氟康唑(12 δ¼g/mL)培养 21 次后,可获得诱导抗药性。同时,在 SC5314 菌株中也进行了 SL-A92 加氟康唑的培养,并用 MIC80s 来评估 SL-A92 在诱导过程中对耐药性的抑制作用。实时 RT-PCR 研究了诱导 SC5314 菌株中 CDR1 和 CDR2 mRNA 的水平。氟康唑和 SL-A92(200 δ¼g/mL)联合诱导的 SC5314 菌株没有产生耐药性。第24天,与单独使用氟康唑相比,联合使用氟康唑和SL-A92的SC5314菌株的CDR1和CDR2 mRNA水平分别为26%和24%;第30天,CDR1和CDR2 mRNA水平分别为43%和31%。在氟康唑诱导过程中,SL-A92 可阻止耐药性的产生,而耐药性的产生部分源于 CDR1 和 CDR2 的下调。