›› 2017, Vol. 37 ›› Issue (7): 583-587.

• 基础研究 • 上一篇    下一篇

不同蔗糖浓度下外源性右旋糖酐酶协同氟化钠对变异链球菌成熟生物膜和胞外多糖的作用研究

房宏志1,喻譞2,田媛媛1,杨英明3,杨惠3,胡涛3   

  1. 1. 成都市第三人民医院口腔科
    2. 鄞州人民医院,宁波大学医学院附属鄞州医院
    3. 四川大学华西口腔医院
  • 收稿日期:2016-12-20 修回日期:2017-03-08 出版日期:2017-07-28 发布日期:2017-07-18
  • 通讯作者: 杨惠 E-mail:yanghui09@scu.edu.cn
  • 基金资助:
    国家自然科学基金青年基金;四川省科技厅应用基础研究项目

Effects of exogenous dextranase and sodium fluoride on mature biofilmand exopolysaccharide production of Streptococcus Mutans in different sucrose concentration mediums

fang hongzhi,yu xuan,tian yuanyuan,yang yingming,yang hui,hu tao   

  • Received:2016-12-20 Revised:2017-03-08 Online:2017-07-28 Published:2017-07-18
  • Contact: yang hui E-mail:yanghui09@scu.edu.cn

摘要: 目的:研究不同蔗糖浓度培养基下右旋糖酐酶(Dex)与氟化钠(NaF)联用对变异链球菌(S. Mutans)成熟生物膜的消解作用和胞外多糖的调控作用。方法:1)体外形成成熟生物膜,测量生物膜干重;2)采用闪烁计数法检测不同蔗糖浓度下Dex和NaF对成熟生物膜胞外水溶性葡聚糖和水不溶性葡聚糖含量的影响;3)扫描电子显微镜观察处理因素对成熟生物膜的消解作用。结果:1)Dex+NaF作用后,生物膜干重与对照组相比显著降低(p<0.05);2)Dex+NaF能显著减少S. Mutans胞外多糖含量(p<0.05);3)Dex+NaF对S. Mutans成熟生物膜有明显消解作用(p<0.05);4)Dex+NaF对胞外多糖和生物膜的消解作用随蔗糖浓度升高而增强。结论: Dex和NaF联用对S. Mutans成熟生物膜具有消解作用,能显著减少其胞外多糖含量,作用效应随蔗糖浓度增加呈现增强的趋势。

关键词: 变异链球菌, 生物膜, 右旋糖酐酶, 氟化钠, 胞外多糖

Abstract: Objective: To investigate the combined effects ofexogenous dextranase(Dex) and sodium fluoride (NaF) on the mature biofilm and exopolysaccharide productionof S. Mutansin different sucrose concentration medium.Materials and Methods:1)Establish S. mutansmaturemonospecies biofilm in vitro and measure the dry-weight of the biofilms. 2) The exopolysaccharide in mature biofilms labeled with 14C and were determined by means of scintillation counting; 3) The structure of the mature biofilm was detected by scanning electron microscope (SEM).Results:1)Thedry-weight of S. mutansmature biofilmsreduced after treated with Dex and NaF (p<0.05). 2) Combined use of Dex and NaFcould decrease the exopolysaccharideproduction(p<0.05). 3) Dex and NaFcould destroy the mature S. mutans biofilms(p<0.05). 4) The effect of Dex and NaF on biofilms and exopolysaccharidestrengthened with the increase of sucrose concentration. Conclusions: The combined use of Dex and NaFcould significantly destroy S. mutans mature biofilms and decrease the exopolysaccharideproduction, and their effects had positive relation with the medium sucrose concentration.

Key words: Streptococcus mutans, biofilm, dextranase, NaF, exopolysaccharide

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