Influence of Helicobacter pylori culture supernatant on the ecological balance of a dual-species oral biofilm

  • Wenling Zhang Sichuan University; West China Hospital of Stomatology; State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases
  • Xiaohong Deng Sichuan University; West China Hospital of Stomatology; State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases
  • Xuedong Zhou Sichuan University; West China Hospital of Stomatology; State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases
  • Yuqing Hao Sichuan University; West China Hospital of Stomatology; State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases
  • Yuqing Li Sichuan University; West China Hospital of Stomatology; State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases
Keywords: Helicobacter pylori, Streptococcus mutans, Streptococcus sanguinis, Oral biofilm, Ecological balance

Abstract

Dental caries is a chronic progressive disease occurring in the tooth hard tissue due to multiple factors, in which bacteria are the initial cause. Both Streptococcus mutans and Streptococcus sanguinis are main members of oral biofilm. Helicobacter pylori may also be detected in dental plaque, playing an important role in the development of dental caries. Objective The aim of this study was to investigate the effect of H. pylori culture supernatant on S. mutans and S. sanguinis dual-species biofilm and to evaluate its potential ability on affecting dental health. Material and methods The effect of H. pylori supernatant on single-species and dual-species biofilm was measured by colony forming units counting and fluorescence in situ hybridization (FISH) assay, respectively. The effect of H. pylori supernatant on S. mutans and S. sanguinis extracellular polysaccharides (EPS) production was measured by both confocal laser scanning microscopy observation and anthrone-sulfuric acid method. The effect of H. pylori supernatant on S. mutans gene expression was measured by quantitative real-time PCR (qRT-PCR) assays. Results H. pylori supernatant could inhibit both S. mutans and S. sanguinis biofilm formation and EPS production. S. sanguinis inhibition rate was significantly higher than that of S. mutans. Finally, S. mutans bacteriocin and acidogenicity related genes expression were affected by H. pylori culture supernatant. Conclusion Our results showed that H. pylori could destroy the balance between S. mutans and S. sanguinis in oral biofilm, creating an advantageous environment for S. mutans, which became the dominant bacteria, promoting the formation and development of dental caries.

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Published
2018-01-01
Section
Original Articles