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Effects of quorum sensing on cell viability in Streptococcus mutans biofilm formation |
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| Authors: | Kai Zhang Meizhen Ou Junqi Ling |
| Affiliation: | a Department of Oral Biology, Guanghua School of Stomatology, Sun Yat-sen University, 56 Ling Yuan Xi Road, Guangzhou 510055, China b Department of Applied Oral Sciences, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5 c Department of Operative Dentistry, Preventive Dentistry and Endodontics, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, China |
| Abstract: | Streptococcus mutans (S. mutans) uses a quorum sensing (QS) signaling system, which is dependent on competence stimulating peptide (CSP), to regulate diverse physiological activities including bacteriocin production, genetic transformation, and biofilm formation. However, the mechanism of the QS system-induced biofilm formation remains unclear. Here, we demonstrated that the late-stage biofilm formation was increased by the addition of exogenous CSP in S. mutans. The numbers of dead cells in biofilms formed in presence of CSP was 64.5% higher than that without CSP after 12 h (p < 0.05) and 76.3% higher after 24 h (p < 0.05), the numbers of live cells in biofilms formed in presence of CSP were 89.3% higher than that without CSP after 24 h (p < 0.01). The expression of QS-associated genes was increased 3.4-5.3-fold by CSP in biofilms. Our results revealed that cell viability of S. mutans grown in biofilms is affected by the CSP-dependent QS system. |
| Keywords: | Streptococcus mutans Quorum sensing Biofilm |
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