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http://dx.doi.org/10.5352/JLS.2021.31.3.330

Antibacterial and Antibiofilm Activities of Leaf Extracts of Stewartia koreana against Porphyromonas gingivalis  

Kim, Hye Soo (Department of Pharmaceutical Engineering, Gyeongsang National University)
Park, Min Jeong (Department of Pharmaceutical Engineering, Gyeongsang National University)
Kim, Soo Jeong (Department of Pharmaceutical Engineering, Gyeongsang National University)
Kim, Bu Kyung (Department of Pharmaceutical Engineering, Gyeongsang National University)
Park, JunHo (Forest Research Department, Gyeongsangnam-do Forest Environment Research Institute)
Kim, DaeHyun (Forest Research Department, Gyeongsangnam-do Forest Environment Research Institute)
Cho, Soo Jeong (Department of Pharmaceutical Engineering, Gyeongsang National University)
Publication Information
Journal of Life Science / v.31, no.3, 2021 , pp. 330-337 More about this Journal
Abstract
This study was conducted to investigate the potential of Stewartia koreana as oral healthcare materials. The antibacterial activity of ethanol extracts from leaves and branches of S. koreana against oral bacteria was confirmed. The leaf and branch extracts (1 mg/disc) showed antibacterial activity against P. gingivalis only among several tested oral bacteria. The leaf extracts showed higher antibacterial activity, with values similar to those of chlorhexidine, which was used as a positive control. The MIC of the leaf extract against P. gingivalis was 0.4 mg/ml and showed bacteriostatic action. The inhibitory effects of the extract on biofilm formation and on gene expression related to biofilm formation by P. gingivalis were determined by biofilm biomass staining, scanning electron microscopy (SEM), and qRT-PCR analysis. The biofilm production rate and cell growth of P. gingivalis in the cultures treated with 0.2-2.0 mg/ml of S. koreana leaf extracts were significantly decreased in a concentration-dependent manner. The inhibitory effect on the formation of P. gingivalis biofilms at concentrations of 1 mg/ml was confirmed by SEM. The qRT-PCR analysis showed concentration-dependent suppression of the fimA and fimB gene expression associated with fimbriae formation in the cultures treated with 0.2-2.0 mg/ml S. koreana leaf extract. These results support the conclusion that S. koreana leaf extracts can be used as oral healthcare materials derived from natural materials, as demonstrated by the antibacterial action and inhibition of biofilm formation of P. gingivalis.
Keywords
Antibacterial activity; antibiofilm formation; fimbriae; P. gingivalis KCTC5352; Stewartia koreana;
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