华西口腔医学杂志

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含碘的乳过氧化物酶-过氧化氢-硫氰化物系统对变异链球菌致龋性的影响

刘学军  刘瑶梁  晶史璐  楚金普  李蓓蕾   

  1. 郑州大学口腔医学院牙体牙髓病学教研室,郑州 450052
  • 出版日期:2014-08-01 发布日期:2014-08-01
  • 通讯作者: 刘学军,副教授,硕士,E-mail:lxj@zzu.edu.cn
  • 作者简介:刘学军,副教授,硕士,E-mail:lxj@zzu.edu.cn
  • 基金资助:

    河南省科技厅基础与前沿基金资助项目(122300410371)

In vitro study of the effect of a lactoperoxidase-peroxidase-thiocyanate system with iodine on the cariogenicinity of Streptococcus mutans

 Liu Xuejun, Liu Yao, Liang Jing, Shi Lu, Chu Jinpu, Li Beilei   

  1. Dept. of Endodontics, School of Stomatology, Zhengzhou University, Zhengzhou 450052, China
  • Online:2014-08-01 Published:2014-08-01

摘要:

目的  研究含不同浓度碘(I-)的乳过氧化物酶-过氧化氢-硫氰化物系统(LPO-H2O2-SCN-)对变异链球菌生长、黏附、产水不溶性细胞外多糖以及葡萄糖基转移酶(GTF)活性的影响。方法  选用 S.mutans ATCC 25175为实验菌株。采用菌落形成单位(CFU)计数法进行生长实验;用分光光度计法测定细菌的黏附抑制率;用蒽酮法测定水不溶性细胞外多糖的质量浓度;用蒽酮法测定还原糖量,计算 GTF活性。结果  随着 I-浓度的增高,含I-的 LPO-H2O2-SCN-抗菌系统对 S.mutans致龋力的抑制作用增强。当I-≥100 μmol•L-1时,对 S.mutans的生长抑制明显高于对照组( P<0.05);且当I-≥1 000 μmol•L-1时,对S.mutans的生长抑制显著高于以硫氰酸盐(SCN-)为单底物的实验组(P<0.05);当I-≥100 μmol•L-1时,对S.mutans的黏附抑制率达到50%以上,水不溶性细胞外多糖生成量明显减少( P<0.05), GTF活性也明显降低(P<0.05)。结论  通过增加 I-的浓度,可以抵消生理浓度的 SCN-的抑制作用,使含I-的LPO-H2O2-SCN-系统能显著抑制变异链球菌的生长、黏附、水不溶性细胞外多糖生成和GTF活性。

关键词: 变异链球菌, 乳过氧化物酶, 碘离子, 硫氰酸根离子, 葡萄糖基转移酶, 水不溶性细胞外多糖

Abstract:

 Objective  This study aimed to investigate the effect of a lactoperoxidase-peroxidase-thiocyanate (LPO-H2O2-SCN-) systemwith different concentrationsof iodine (I-) on Streptococcus mutans (S.mutans),particularlyon various parameters, includinggrowth, adhesion, glucosyltransferase (GTF)enzyme activity,and insoluble exopolysaccharidesynthesis. Methods S.mutans ATCC 25175 was used as experimental species. Clonal formation unit (CFU) were counted to investigate the inhibi-tory effect on bacterial growth. The inhibition rate of bacterial adherence was calculated to analyze the effect on adhesion. Anthrone method was used to determine the content of insoluble exopolysaccharides and the amount of reducing saccharides. GTF activity and enzyme activity were then determined. Results The inhibitory ability of the LPO-H2O2-SCN-system with I-on the cariogenicinity of S.mutans was strengthened as I-concentration was increased. At I-concentration≥100 μmol•L-1, the antibacterial effects were significantly increased compared with those of the control group (P<0.05). At I-concentration≥ 1 000 μmol•L-1, the antibacterial effects were significantly improved compared with those of the group with SCN-only (P< 0.05). At I-concentration≥100 μmol•L-1, the inhibition rate of bacterial adherence was>50%; insoluble exopolysaccharide synthesis and GTF enzyme activity were reduced (P<0.05). Conclusion The antibacterial effects of the LPO-H2O2-I-system were enhanced by adding I-to overcome the antagonistic effect of physiological SCN-concentration. LPO-H2O2-SCN-system with different concentrations of I-showed statistically significant inhibitory effectson growth, adhesion, insoluble exopolysac-charide synthesis,andGTF enzyme activity.

Key words: Streptococcus mutans, lactoperoxidase, iodine, thiocyanate, glucosyltransferase, insoluble exopolysaccharides