大蒜素对白假丝酵母菌生物被膜的抑制作用

Inhibition effect of allitride on Candida albicans biofilm

目的研究大蒜素对白假丝酵母菌生物被膜(BF)内真菌的抑制作用。方法用FITC-conA标记白假丝酵母菌BF的多糖成分,利用荧光显微镜从形态学上观察大蒜素对白假丝酵母菌BF形成过程的影响。将标本分为5组,分别是对照组(大蒜素浓度为0)、大蒜素0.25mg/mL组、大蒜素0.5mg/mL组,大蒜素1.0mg/mL组、大蒜素2.0mg/mL组。应用XTT减低法定量检测大蒜素对白假丝酵母菌BF中真菌的杀灭作用。结果在荧光显微镜下可见大蒜素2.0mg/mL组大蒜素干预白假丝酵母菌BF后的荧光强度较大蒜素0.5mg/mL组及对照组的荧光强度减弱。大蒜素0.5、1.0、2.0mg/mL作用于白假丝酵母菌BF 5h后,XTT减低法光密度(OD)450的值分别为1.87±0.31、1.64±0.25和1.30±0.29,分别与对照组的2.11±0.26比较,差异均有统计学意义(P<0.05);0.25mg/mL的大蒜素作用白假丝酵母菌BF后,OD450值为1.93±0.31,与对照组比较,差异无统计学意义(P>0.05)。结论大蒜素能杀灭白假丝酵母菌BF内的真菌,对BF有抑制作用。在一定浓度范围内,随着大蒜素浓度的增加,其对BF的抑制作用逐渐增强。

Objective To investigate the killing effect of allitride on fungus inside Candida albicans biofilm （BF） .Methods The polyascchride components of BF was labeled by FITC-conA .The fluorescence microscopic was adopted to observe the effect of al-litride on the BF forming process of Candida albicans in morphology .The specimens were divided into 3 groups ,the control group （allicin concentration of 0） ,0 .25 mg/mL allicin group ,0 .5 mg/mL allicin group ,1 .0 mg/mL allicin group ,2 .0 mg/mL allicin group .The XTT reduction assay was performed to quantitatively detect the killing effect of allitride on fungus inside Candida albi-cans BF .Results After the treatment by different concentrations of allitride ,the BF structure was observed by fluorescence micros-copy .The fluorescence intensity of high concentration group was weakened compared with the low concentration group and the con-trol group .The ODA450 values of the XTT reduction assay after acting on Candida albicans BF for 5 h by different concentrations of allitride （0 .5 ,1 .0 ,2 .0 mg/mL） were 1 .87 ± 0 .31 ,1 .64 ± 0 .25 and 1 .30 ± 0 .29 ,respectively ,and the OD450 value of the control group was 2 .11 ± 0 .26 ,there was statistically significant difference between the allitride groups and control group （P〈0 .05）;after acting on Candida albicans BF by 0 .25 mg/mL allitride ,the OD450 value was 1 .93 ± 0 .31 ,the difference had no statistical signifi-cance compared with the control group（P〉0 .05） .Conclusion Allitride can kill the fungus inside BF of Candida albicans and has the inhibiting effect on biofilm .Moreover the inhibiting effect on biofilm is increased with its concentration increase within certain concentration range .