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Specific Anti-biofilm Activity of Carbon Quantum Dots by Destroying P. gingivalis Biofilm Related Genes

Authors Liang G, Shi H, Qi Y, Li J, Jing A, Liu Q, Feng W, Li G, Gao S

Received 11 March 2020

Accepted for publication 9 June 2020

Published 31 July 2020 Volume 2020:15 Pages 5473—5489


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Linlin Sun

Gaofeng Liang,1,2 Hao Shi,3 Yijun Qi,1 Jinghua Li,3 Aihua Jing,3 Qiwei Liu,2 Wenpo Feng,1 Guangda Li,3 Shegan Gao1,2

1Medical College, Henan University of Science and Technology, Luoyang 471023, People’s Republic of China; 2Henan Key Laboratory of Cancer Epigenetics, The First Affiliated Hospital of Henan University of Science and Technology, Luoyang 471023, People’s Republic of China; 3School of Medical Technology and Engineering, Henan University of Science and Technology, Luoyang 471023, People’s Republic of China

Correspondence: Gaofeng Liang; Shegan Gao Email;

Introduction: Biofilms protect bacteria from antibiotics and this can produce drug-resistant strains, especially the main pathogen of periodontitis, Porphyromonas gingivalis. Carbon quantum dots with various biomedical properties are considered to have great application potential in antibacterial and anti-biofilm treatment.
Methods: Tinidazole carbon quantum dots (TCDs) and metronidazole carbon quantum dots (MCDs) were prepared by a hydrothermal method with the clinical antibacterial drugs tinidazole and metronidazole, respectively. Then, TCDs and MCDs were characterized by transmission electron microscopy, UV–visible spectroscopy, infrared spectroscopy and energy-dispersive spectrometry. The antibacterial effects were also investigated under different conditions.
Results: The TCDs and MCDs had uniform sizes. The results of UV–visible and energy-dispersive spectrometry confirmed their important carbon polymerization structures and the activity of the nitro group, which had an evident inhibitory effect on P. gingivalis, but almost no effect on other bacteria, including Escherichia coli, Staphylococcus aureus and Prevotella nigrescens. Importantly, the TCDs could penetrate the biofilms to further effectively inhibit the growth of P. gingivalis under the biofilms. Furthermore, it was found that the antibacterial effect of TCDs lies in its ability to impair toxicity by inhibiting the major virulence factors and related genes involved in the biofilm formation of P. gingivalis, thus affecting the self-assembly of biofilm-related proteins.
Conclusion: The findings demonstrate a promising new method for improving the efficiency of periodontitis treatment by penetrating the P. gingivalis biofilm with preparations of nano-level antibacterial drugs.

Keywords: P. gingivalis, carbon dots, Tinidazole, biofilms, penetration

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