Article Publish Status: FREE
Abstract Title:

Human cathelicidin LL-37 enhance the antibiofilm effect of EGCG on Streptococcus mutans.

Abstract Source:

BMC Oral Health. 2016 Sep 22 ;16(1):101. Epub 2016 Aug 22. PMID: 27659310

Abstract Author(s):

Yi-Jie Guo, Bo Zhang, Xue-Song Feng, Hui-Xun Ren, Ji-Ru Xu

Article Affiliation:

Yi-Jie Guo


BACKGROUND: Streptococcus mutans forms biofilms as a resistance mechanism against antimicrobial agents in the human oral cavity. We recently showed that human cathelicidin LL-37 exhibits inhibitory effects on biofilm formation of S. mutans through interaction with lipoteichoic acid (LTA), but without antibacterial or biofilm dispersal abilities. (-)-Epigallocatechin gallate (EGCG) is the most abundant constituent of tea catechins that has the greatest anti-infective potential to inhibit the growth of various microorganisms and biofilm formation. Therefore, in this study, we evaluated whether LL-37 interacts with EGCG to enhance the antibiofilm effect of EGCG on S. mutans biofilm formation.

METHODS: Clinical S. mutans strains (n = 10) isolated from children's saliva were tested in a biofilm formation assay. The antibiofilm effect of EGCG with and without LL-37 was analyzed by the minimum biofilm eradication concentration assay and confirmed using field emission-scanning electron microscopy. In addition, the interactionamong EGCG, LL-37, and LTA of S. mutans was determined using quartz crystal microbalance analysis.

RESULTS: EGCG killed 100 % of planktonic S. mutans within 5 h, inhibited biofilm formation within 24 h, and reduced bacteria cells in preformed biofilms within 3 h at a concentration of 0.2 mg/mL. However, EGCG did not appear to interact with LTA. LL-37 effectively enhanced the bactericidal activity of EGCG against biofilm formation and preformed biofilms as determined by quantitative crystal violet staining and field emission-scanning electron microscopy. In addition, quartz crystal microbalance analysis revealed that LL-37 interacted with EGCG and promoted binding between EGCG and LTA of S. mutans.

CONCLUSIONS: We show that LL-37 enhances the antibiofilm effect of EGCG on S. mutans. This finding provides new knowledge for dental treatment by using LL-37 as a potential antibiofilm compound.

Study Type : In Vitro Study

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Sayer Ji
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