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Li E, Li S, Wang S, Li Q, Pang D, Yang Q, Zhu Q, Zou Y. Antibacterial Effects of Ramulus mori Oligosaccharides against Streptococcus mutans. Foods 2023; 12:3182. [PMID: 37685114 PMCID: PMC10486356 DOI: 10.3390/foods12173182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 08/18/2023] [Accepted: 08/19/2023] [Indexed: 09/10/2023] Open
Abstract
Ramulus mori has been widely used in traditional Chinese medicine because of its physiological activities, including antibacterial, anti-inflammatory, and antioxidant activities. Antimicrobial properties of Ramulus mori extract have been well described. However, no information is available regarding on Ramulus mori oligosaccharides (RMOS). The aim of this study was to investigate the effects of RMOS on the growth and virulence properties of the cariogenic bacterium Streptococcus mutans. The effects of RMOS on the biofilm structure and virulence gene expression of S. mutans were also evaluated, and the results were compared with the effects of commercial prebiotic galactooligosaccharides. RMOS were found to have an antibacterial effect against S. mutans, resulting in significant reductions in acid production, lactate dehydrogenase activity, adhesion, insoluble extracellular polysaccharide production, glucosyltransferase activity, and biofilm formation in a dose-dependent manner. Moreover, the biofilm structure was visibly damaged. A quantitative real-time PCR assay revealed downregulation of virulence gene-regulated acid production, polysaccharide production, adhesion, biofilm formation, and quorum sensing. These findings suggest that RMOS may be a promising natural product for the prevention of dental caries.
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Affiliation(s)
- Erna Li
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture and Rural Affairs/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China; (E.L.)
| | - Shipei Li
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture and Rural Affairs/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China; (E.L.)
- College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Siyuan Wang
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture and Rural Affairs/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China; (E.L.)
| | - Qian Li
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture and Rural Affairs/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China; (E.L.)
| | - Daorui Pang
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture and Rural Affairs/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China; (E.L.)
| | - Qiong Yang
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture and Rural Affairs/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China; (E.L.)
| | - Qiaoling Zhu
- College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Yuxiao Zou
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture and Rural Affairs/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China; (E.L.)
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Borges MHR, Nagay BE, Costa RC, Souza JGS, Mathew MT, Barão VAR. Recent advances of polypyrrole conducting polymer film for biomedical application: Toward a viable platform for cell-microbial interactions. Adv Colloid Interface Sci 2023; 314:102860. [PMID: 36931199 DOI: 10.1016/j.cis.2023.102860] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 02/04/2023] [Accepted: 02/13/2023] [Indexed: 02/18/2023]
Abstract
Polypyrrole (PPy) is one of the most studied conductive polymers due to its electrical conductivity and biological properties, which drive the possibility of numerous applications in the biomedical area. The physical-chemical features of PPy allow the manufacture of biocompatible devices, enhancing cell adhesion and proliferation. Furthermore, owing to the electrostatic interactions between the negatively charged bacterial cell wall and the positive charges in the polymer structure, PPy films can perform an effective antimicrobial activity. PPy is also frequently associated with biocompatible agents and antimicrobial compounds to improve the biological response. Thus, this comprehensive review appraised the available evidence regarding the PPy-based films deposited on metallic implanted devices for biomedical applications. We focus on understanding key concepts that could influence PPy attributes regarding antimicrobial effect and cell behavior under in vitro and in vivo settings. Furthermore, we unravel the several agents incorporated into the PPy film and strategies to improve its functionality. Our findings suggest that incorporating other elements into the PPy films, such as antimicrobial agents, biomolecules, and other biocompatible polymers, may improve the biological responses. Overall, the basic properties of PPy, when combined with other composites, electrostimulation techniques, or surface treatment methods, offer great potential in biocompatibility and/or antimicrobial activities. However, challenges in synthesis standardization and potential limitations such as low adhesion and mechanical strength of the film must be overcome to improve and broaden the application of PPy film in biomedical devices.
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Affiliation(s)
- Maria H R Borges
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo 13414-903, Brazil
| | - Bruna E Nagay
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo 13414-903, Brazil
| | - Raphael C Costa
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo 13414-903, Brazil
| | - João Gabriel S Souza
- Dental Research Division, Guarulhos University (UNG), Guarulhos, Sāo Paulo 07023-070, Brazil; Dental Science School (Faculdade de Ciências Odontológicas - FCO), Montes Claros, Minas Gerais 39401-303, Brazil
| | - Mathew T Mathew
- Department of Biomedical Sciences, University of Illinois, College of Medicine, Rockford, IL 61107, USA
| | - Valentim A R Barão
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo 13414-903, Brazil.
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Kong C, Zhang H, Li L, Liu Z. Effects of green tea extract epigallocatechin-3-gallate (EGCG) on oral disease-associated microbes: a review. J Oral Microbiol 2022; 14:2131117. [PMID: 36212989 PMCID: PMC9542882 DOI: 10.1080/20002297.2022.2131117] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
For thousands of years, caries, periodontitis and mucosal diseases, which are closely related to oral microorganisms, have always affected human health and quality of life. These complex microbiota present in different parts of the mouth can cause chronic infections in the oral cavity under certain conditions, some of which can also lead to acute and systemic diseases. With the mutation of related microorganisms and the continuous emergence of drug-resistant strains, in order to prevent and treat related diseases, in addition to the innovation of diagnosis and treatment technology, the development of new antimicrobial drugs is also important. Catechins are polyphenolic compounds in green tea, some of which are reported to provide health benefits for a variety of diseases. Studies have shown that epigallocatechin-3-gallate (EGCG) is the most abundant and effective active ingredient in green tea catechins, which acts against a variety of gram-positive and negative bacteria, as well as some fungi and viruses. This review aims to summarize the research progress on the activity of EGCG against common oral disease-associated organisms and discuss the mechanisms of these actions, hoping to provide new medication strategies for the prevention and treatment of oral infectious diseases, the future research of EGCG and its translation into clinical practice are also discussed.
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Affiliation(s)
- Chen Kong
- Hospital of Stomatology, Jilin University, Changchun, Jilin, China
| | - Huili Zhang
- Hospital of Stomatology, Jilin University, Changchun, Jilin, China
| | - Lingfeng Li
- Hospital of Stomatology, Jilin University, Changchun, Jilin, China
| | - Zhihui Liu
- Hospital of Stomatology, Jilin University, Changchun, Jilin, China
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Chen R, Du M, Liu C. Strategies for dispersion of cariogenic biofilms: applications and mechanisms. Front Microbiol 2022; 13:981203. [PMID: 36134140 PMCID: PMC9484479 DOI: 10.3389/fmicb.2022.981203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 08/11/2022] [Indexed: 11/05/2022] Open
Abstract
Bacteria residing within biofilms are more resistant to drugs than planktonic bacteria. They can thus play a significant role in the onset of chronic infections. Dispersion of biofilms is a promising avenue for the treatment of biofilm-associated diseases, such as dental caries. In this review, we summarize strategies for dispersion of cariogenic biofilms, including biofilm environment, signaling pathways, biological therapies, and nanovehicle-based adjuvant strategies. The mechanisms behind these strategies have been discussed from the components of oral biofilm. In the future, these strategies may provide great opportunities for the clinical treatment of dental diseases. Graphical Abstract.
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徐 丽, 刘 姗, 王 敏, 刘 芳, 张 容, 张 凯. [Regulatory role of small RNA srn821978 in mutacin IV expression in Streptococcus mutans]. NAN FANG YI KE DA XUE XUE BAO = JOURNAL OF SOUTHERN MEDICAL UNIVERSITY 2021; 41:1725-1732. [PMID: 34916201 PMCID: PMC8685694 DOI: 10.12122/j.issn.1673-4254.2021.11.19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Indexed: 06/14/2023]
Abstract
OBJECTIVE To analyze the role of small RNA srn821798 in posttranscriptional regulation of mutacin IV expression in Streptococcus mutans. METHODS The potential target genes of srn821978 were predicted using RNAhybrid, RNAPredator and IntaRNA. We collected 10 Streptococcus mutans (S.muans) strains with high expression of mutacin IV and another 10 S.muans strains that did not express mutacin IV screened by inhibition zone test, and the expression levels of srn821798 and the candidate target genes in these strains were detected by qPCR. Using synthesized mimics and inhibitors of srn821798, we constructed S.muans strains with high or low srn821798 expression via electroporation based on the standard strain of S.muans UA159, and analyzed the expression levels of srn821798 and its candidate target genes in these strains. We also examined the binding ability of srn821798 to its target gene sepM using electrophoresis and a dual- luciferase reporter system. RESULTS The expression levels of the candidate target genes of srn821798 including sepM, comD, comE, nlmA and nlmB were significantly higher while the expression level of srn821798 was significantly lower in clinical S.muans strains with high expression of mutacin IV than in those without mutacin IV expression (P < 0.05). Although the expression levels of the candidate target genes in strains with up- regulated or down- regulated srn821798 expression did not differ significantly from those in the standard strain, the expression level of sepM showed a trend of differential distribution, and srn821798 was predicted to have a strong binding ability to sepM action site. CONCLUSION srn821798 may play a regulatory role in the expression of mutacin IV in S.muans, but the underlying mechanism remains to be explored.
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Affiliation(s)
- 丽 徐
- 蚌埠医学院第一附属医院口腔科,安徽 蚌埠 233004Department of Stomatology, First Affiliated Hospital of Bengbu Medical College, Bengbu233004, China
| | - 姗姗 刘
- 蚌埠医学院第一附属医院口腔科,安徽 蚌埠 233004Department of Stomatology, First Affiliated Hospital of Bengbu Medical College, Bengbu233004, China
| | - 敏 王
- 蚌埠医学院第二附属医院口腔科,安徽 蚌埠 233040Department of Stomatology, Second Affiliated Hospital of Bengbu Medical College, Bengbu233040, China
| | - 芳 刘
- 蚌埠医学院第一附属医院口腔科,安徽 蚌埠 233004Department of Stomatology, First Affiliated Hospital of Bengbu Medical College, Bengbu233004, China
| | - 容秀 张
- 蚌埠医学院第一附属医院口腔科,安徽 蚌埠 233004Department of Stomatology, First Affiliated Hospital of Bengbu Medical College, Bengbu233004, China
| | - 凯 张
- 蚌埠医学院第一附属医院口腔科,安徽 蚌埠 233004Department of Stomatology, First Affiliated Hospital of Bengbu Medical College, Bengbu233004, China
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Dai W, Zhang Y, Zhang J, Xue C, Yan J, Li X, Zheng X, Dong R, Bai J, Su Y, Xie P, Zhong W, Zhang H, Yan Z, Zhong W, Song Y. Analysis of Antibiotic-induced Drug Resistance of Salmonella Enteritidis and Its Biofilm Formation Mechanism. Bioengineered 2021; 12:10254-10263. [PMID: 34637696 PMCID: PMC8809914 DOI: 10.1080/21655979.2021.1988251] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
This research was to explore antibiotic-induced drug resistance of Salmonella enteritidis and its biofilm formation mechanism. Kirby-Bauer (K-B) disk method recommended by Clinical and Laboratory Standards Institute (CLSI) was used to test drug sensitivity of Salmonella enteritidis to 16 kinds of antibiotics including ß-lactams, aminoglycosides, quinolones, sulfonamides, chloramphenicols, and tetracyclines. Polymerase chain reaction (PCR) was performed to detect carrying of drug resistance genes of 29 kinds of antibiotics including ß-lactams, aminoglycosides, quinolones, sulfonamides, chloramphenicols, and tetracyclines of Salmonella enteritidis. The expressions of esp, ebpA, ge1E, and fsrB genes in biofilm group and plankton group were detected when Salmonella was induced, and difference of gene expression was detected by FQ-PCR. The drug resistance rates of Salmonella enteritidis to nalidixic acid, ampicillin, streptomyces, and cefoperazone were high, which were 94.5%, 75%, 67%, and 52%, respectively. 94 strains of Salmonella enteritidis formed 22 kinds of drug resistance spectrum, the strains were generally resistant to 4-5 antibiotics, and some strains formed fixed drug resistance spectrum as follows: AMP-CFP-STR-NA-TE (22.6,21.7%), AMP-STR-NA-TE (17,16%), and AMP-CFP-STR-NA (11.1,10.6%). During biofilm formation, fsr can increase expression of ge1E and decrease expression of esp and ebpA. Consequently, Salmonella enteritidis was generally resistant to nalidixic acid, ampicillin, and streptomycin, and the multidrug resistance was severe. The drug resistance genes sul2, sul3, blaTEM-1-like, tet(A), and tet(G) were highly carried in Salmonella enteritidis. Esp, ebpA, ge1E, and fsrB genes were closely related to biofilm formation of Salmonella enteritidis.
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Affiliation(s)
- Weiping Dai
- Institute for disease control and prebertion, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, Heilongjiang Province, China
| | - Yuliang Zhang
- Department of infectious diseases, Infectious Disease Hospital of Heilongjiang Province, Harbin 150500, Heilongjiang Province, China
| | - Jianfeng Zhang
- Institute for disease control and prebertion, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, Heilongjiang Province, China
| | - Chengyu Xue
- Institute for disease control and prebertion, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, Heilongjiang Province, China
| | - Jun Yan
- Institute for disease control and prebertion, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, Heilongjiang Province, China
| | - Xin Li
- Institute for disease control and prebertion, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, Heilongjiang Province, China
| | - Xiaohua Zheng
- Institute for disease control and prebertion, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, Heilongjiang Province, China
| | - Rui Dong
- Institute for disease control and prebertion, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, Heilongjiang Province, China
| | - Jing Bai
- Institute for disease control and prebertion, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, Heilongjiang Province, China
| | - Yi Su
- Institute for disease control and prebertion, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, Heilongjiang Province, China
| | - Pinghui Xie
- Institute for disease control and prebertion, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, Heilongjiang Province, China
| | - Weiming Zhong
- Institute for disease control and prebertion, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, Heilongjiang Province, China
| | - Hongyang Zhang
- Institute for disease control and prebertion, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, Heilongjiang Province, China
| | - Zibo Yan
- Institute for disease control and prebertion, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, Heilongjiang Province, China
| | - Weiqi Zhong
- Institute for disease control and prebertion, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, Heilongjiang Province, China
| | - Yu Song
- Food Science and Technology Branch, Heilongjiang Vocational College of Biology Science and Technology, Harbin 150025, Heilongjiang Province, China
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The Influence of Propolis on Dental Plaque Reduction and the Correlation between Dental Plaque and Severity of COVID-19 Complications-A Literature Review. Molecules 2021; 26:molecules26185516. [PMID: 34576987 PMCID: PMC8469669 DOI: 10.3390/molecules26185516] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 09/03/2021] [Accepted: 09/08/2021] [Indexed: 11/16/2022] Open
Abstract
Current studies suggest that cariogenic bacteria in dental plaque influence the severity of COVID-19 complications since the oral cavity is a reservoir for respiratory pathogens potentially responsible for the development of hospital-acquired pneumonia. This article focuses on the association between dental plaque and COVID-19 concerning the influence of altered oral biofilm on the risk of increased severity of SARS-CoV-2 infection. Moreover, it concentrates on the usefulness of propolis, with its apitherapeutic antibacterial properties, for treating oral bacterial infections co-occurring with SARS-CoV-2 infection. A review of the literature on PubMed, Cochrane Library and Medline between 2000 and 2021 revealed 56 published articles indicating that a link between dental plaque and COVID-19 complications was probable. Furthermore, they indicated that propolis may minimize COVID-19 severity by reducing dental plaque accumulation. The possibility that improved oral health could reduce the risk of COVID-19 complications should be of interest to scientists.
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Becerra-Ruiz JS, Guerrero-Velázquez C, Martínez-Esquivias F, Martínez-Pérez LA, Guzmán-Flores JM. Innate and adaptive immunity of periodontal disease. From etiology to alveolar bone loss. Oral Dis 2021; 28:1441-1447. [PMID: 33884712 DOI: 10.1111/odi.13884] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 03/25/2021] [Accepted: 04/14/2021] [Indexed: 12/16/2022]
Abstract
Periodontal disease refers to inflammation of the tissues that support the tooth. It is of multifactorial etiology. Innate and adaptive immune cells participate jointly through the release of their molecules and mechanisms of action in order to maintain homeostasis in periodontal tissues, so the host's immune response plays an essential role in defense against microorganisms. However, bacterial persistence and the dysregulation of the immune system as an exaggerated response can lead to the worsening of periodontal disease, leading to loss of gingival tissue and alveolar bone and thereby loss of teeth. Therefore, a better understanding of the cellular mechanisms involved in the development of periodontal disease is necessary to design new treatments and prophylactic measures in order to decrease the prevalence of this disease that afflicts a large part of the world population.
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Affiliation(s)
- Julieta Saraí Becerra-Ruiz
- Doctorado en Biociencias, Centro Universitario de Los Altos, Universidad de Guadalajara, Jalisco, México
| | - Celia Guerrero-Velázquez
- Instituto de Investigación en Odontología, Centro Universitario de Ciencias de La Salud, Universidad de Guadalajara, Jalisco, México
| | | | - Luz Andrea Martínez-Pérez
- Doctorado en Biociencias, Centro Universitario de Los Altos, Universidad de Guadalajara, Jalisco, México
| | - Juan Manuel Guzmán-Flores
- Instituto de Investigación en Biociencias, Centro Universitario de Los Altos, Universidad de Guadalajara, Jalisco, México
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Abstract
Biofilms are aggregates formed as a protective survival state by microorganisms to adapt to the environment and can be resistant to antimicrobial agents and host immune responses due to chemical or physical diffusion barriers, modified nutrient environments, suppression of the growth rate within biofilms, and the genetic adaptation of cells within biofilms. With the widespread use of medical devices, medical device-associated biofilms continue to pose a serious threat to human health, and these biofilms have become the most important source of nosocomial infections. However, traditional antimicrobial agents cannot completely eliminate medical device-associated biofilms. New strategies for the treatment of these biofilms and targeting biofilm infections are urgently required. Several novel approaches have been developed and identified as effective and promising treatments. In this review, we briefly summarize the challenges associated with the treatment of medical device-associated biofilm infections and highlight the latest promising approaches aimed at preventing or eradicating these biofilms.
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Tsujii T, Kawada-Matsuo M, Migita H, Ohta K, Oogai Y, Yamasaki Y, Komatsuzawa H. Antibacterial activity of phellodendron bark against Streptococcus mutans. Microbiol Immunol 2020; 64:424-434. [PMID: 32196736 DOI: 10.1111/1348-0421.12787] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Revised: 03/13/2020] [Accepted: 03/16/2020] [Indexed: 01/01/2023]
Abstract
Streptococcus mutans is a major cause of tooth decay due to its promotion of biofilm formation and acid production. Several plant extracts have been reported to have multiple biological activities such as anti-inflammation and antibacterial effects. This study investigated the antibacterial activity of three plant extracts, phellodendron bark (PB), yucca, and black ginger, and found that PB had a stronger effect than the other extracts. Then, the minimum inhibitory concentration (MIC) of PB against 100 S. mutans strains was investigated. The MIC range of PB was 9.8-312.5 µg/mL. PB suppressed the growth kinetics of S. mutans in a dose-dependent manner, even at sub-MICs of PB. Then, we investigated the effect of PB on S. mutans virulence. The PB suppressed biofilm formation at high concentrations, although PB did not affect the expression of glucosyltransferase genes. Additionally, PB suppressed the decrease in pH from adding an excess of glucose. The expression of genes responsible for acid production was increased by the addition of excess glucose without PB, whereas their expression levels were not increased in the presence of 1× and 2× MIC of PB. Although PB showed a bacteriostatic effect on planktonic S. mutans cells, it was found that more than 2× MIC of PB showed a partial bactericidal effect on biofilm cells. In conclusion, PB not only showed antibacterial activity against S. mutans but also decreased the cariogenic activity in S. mutans.
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Affiliation(s)
- Toshiya Tsujii
- Department of Pediatric Dentistry, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
- Department of Oral Microbiology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - Miki Kawada-Matsuo
- Department of Oral Microbiology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
- Department of Bacteriology, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - Hirono Migita
- Department of Oral Microbiology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - Kouji Ohta
- Department of Public Oral Health, Program of Oral Health Sciences, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - Yuichi Oogai
- Department of Oral Microbiology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - Youichi Yamasaki
- Department of Pediatric Dentistry, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - Hitoshi Komatsuzawa
- Department of Bacteriology, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
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