West China Journal of Stomatology ›› 2022, Vol. 40 ›› Issue (2): 218-224.doi: 10.7518/hxkq.2022.02.014

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Study on the inhibitory effect of selective estrogen receptor modulators on Streptococcus mutans

Liao Shengnan1(), Weitong Lü2, Tang Quan2, Ma Yuwen2, Liu Lijia2, Wang Liang2, Peng Xian2()   

  1. 1.State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
    2.State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
  • Received:2021-04-12 Revised:2022-01-10 Online:2022-04-01 Published:2022-04-01
  • Contact: Peng Xian E-mail:1983556223@qq.com;pengx@scu.edu.cn
  • Supported by:
    The National Natural Science Foundation of China(81700963);Sichuan Science and Technology Program(2018JY0561);Correspondence: Peng Xian, E-mail: pengx@scu.edu.cn

Abstract: Objective

To screen small-molecule antibacterial drugs and investigate the antibacterial effect and mechanism of selective estrogen receptor modulators (SERMs) against Streptococcus mutans (S.mutans).

Methods

The minimum inhibitory concentration of 426 Food and Drug Administration (FDA)-approved small-molecule drugs against S. mutans was determined using the microdilution method, and the target of SERMs acting on S. mutans was explored by employing a random transposon mutant library.

Results

Among the 426 FDA-approved SERMs, toremiphene, tamoxifen, clomiphene, and raloxifene exhibited excellent antibacterial effects against S.mutans. Results of mutant library screening showed that the two mutant strains were resistant to clomiphene. The gene sequence of the resistant strains showed that the transposon insertion sites were located in the genes of smu_546 and smu_874.

Conclusion

SERMs, such as toremifene, tamoxifen, clomiphene, and raloxifene, exerted obvious antibacterial effects on S. mutans, and their targets may be proteins expressed by smu_546 and smu_874 gene.

Key words: Streptococcus mutans, dental caries, antibacterial effect, transposon mutant library

CLC Number: