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Wang C, Wei PW, Song CR, Wang X, Zhu GF, Yang YX, Xu GB, Hu ZQ, Tang L, Liu HM, Wang B. Evaluation of the antimicrobial function of Ginkgo biloba exocarp extract against clinical bacteria and its effect on Staphylococcus haemolyticus by disrupting biofilms. JOURNAL OF ETHNOPHARMACOLOGY 2022; 298:115602. [PMID: 36030030 DOI: 10.1016/j.jep.2022.115602] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 07/22/2022] [Accepted: 08/01/2022] [Indexed: 06/15/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The fruit of Ginkgo biloba L. (Ginkgo nuts) has been used for a long time as a critical Chinese medicine material to treat cough and asthma, as well as a disinfectant. Similar records were written in the Compendium of Materia Medica (Ben Cao Gang Mu, pinyin in Chinese) and Sheng Nong's herbal classic (Shen Nong Ben Cao Jing, pinyin in Chinese). Recent research has shown that Ginkgo biloba exocarp extract (GBEE) has the functions of unblocking blood vessels and improving brain function, as well as antitumour activity and antibacterial activity. GBEE was shown to inhibit methicillin-resistant Staphylococcus aureus (MRSA) biofilm formation as a traditional Chinese herb in our previous report in this journal. AIM OF THE STUD: yThe antibiotic resistance of clinical bacteria has recently become increasingly serious. Thus, this study aimed to investigate the Ginkgo biloba exocarp extract (GBEE) antibacterial lineage, as well as its effect and mechanism on S. haemolyticus biofilms. This study will provide a new perspective on clinical multidrug resistant (MDR) treatment with ethnopharmacology herbs. METHODS The microbroth dilution assay was carried out to measure the antibacterial effect of GBEE on 13 types of clinical bacteria. Bacterial growth curves with or without GBEE treatment were drawn at different time points. The potential targets of GBEE against S. haemolyticus were screened by transcriptome sequencing. The effects of GBEE on bacterial biofilm formation and mature biofilm disruption were determined by crystal violet staining and scanning electron microscopy. The metabolic activity of bacteria inside the biofilm was assessed by colony-forming unit (CFU) counting and (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2HY-tetrazolium bromide (MTT) assay. Quantitative polymerase chain reaction (qPCR) was used to measure the gene expression profile of GBEE on S. haemolyticus biofilm-related factors. RESULTS The results showed that GBEE has bacteriostatic effects on 3 g-positive (G+) and 2 g-negative (G-) bacteria among 13 species of clinical bacteria. The antibacterial effect of GBEE supernatant liquid was stronger than the antibacterial effect of GBEE supernviaould-like liquid. GBEE supernatant liquid inhibited the growth of S. epidermidis, S. haemolyticus, and E. faecium at shallow concentrations with minimum inhibitory concentrations (MICs) of 2 μg/ml, 4 μg/ml and 8 μg/ml, respectively. Genes involved in quorum sensing, two-component systems, folate biosynthesis, and ATP-binding cassette (ABC) transporters were differentially expressed in GBEE-treated groups compared with controls. Crystal violet, scanning electron microscopy (SEM) and MTT assays showed that GBEE suppressed S. haemolyticus biofilm formation in a dose-dependent manner. Moreover, GBEE supernatant liquid downregulated cidA, cidB and atl, which are involved in cell lysis and extracellular DNA (eDNA) release, as well as downregulated the cbp, ebp and fbp participation in encoding cell-surface binding proteins. CONCLUSIONS GBEE has an excellent antibacterial effect on gram-positive bacteria and also inhibits the growth of gram-negative bacteria, such as A. baumannii (carbapenem-resistant Acinetobacter baumannii) CRABA and S. maltophilia. GBEE inhibits the biofilm formation of S. haemolyticus by altering the regulation and biofilm material-related genes, including the release of eDNA and cell-surface binding proteins.
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Affiliation(s)
- Cong Wang
- Guizhou Provincial Engineering Technology Research Center for Chemical Drug R & D, School of Pharmacy, Guizhou Medical University, Guiyang, 550025, Guizhou, China
| | - Peng-Wei Wei
- Engineering Research Center of Medical Biotechnology, Key Laboratory of Biology and Medical Engineering, Key Laboratory of Infectious Immune and Antibody Engineering in Guizhou Province, School of Biology and Engineering, Guizhou Medical University, Guiyang, 550025, Guizhou, China
| | - Chao-Rong Song
- Engineering Research Center of Medical Biotechnology, Key Laboratory of Biology and Medical Engineering, Key Laboratory of Infectious Immune and Antibody Engineering in Guizhou Province, School of Biology and Engineering, Guizhou Medical University, Guiyang, 550025, Guizhou, China
| | - Xu Wang
- Engineering Research Center of Medical Biotechnology, Key Laboratory of Biology and Medical Engineering, Key Laboratory of Infectious Immune and Antibody Engineering in Guizhou Province, School of Biology and Engineering, Guizhou Medical University, Guiyang, 550025, Guizhou, China
| | - Gao-Feng Zhu
- Guizhou Provincial Engineering Technology Research Center for Chemical Drug R & D, School of Pharmacy, Guizhou Medical University, Guiyang, 550025, Guizhou, China
| | - Yong-Xin Yang
- Engineering Research Center of Medical Biotechnology, Key Laboratory of Biology and Medical Engineering, Key Laboratory of Infectious Immune and Antibody Engineering in Guizhou Province, School of Biology and Engineering, Guizhou Medical University, Guiyang, 550025, Guizhou, China
| | - Guo-Bo Xu
- Guizhou Provincial Engineering Technology Research Center for Chemical Drug R & D, School of Pharmacy, Guizhou Medical University, Guiyang, 550025, Guizhou, China
| | - Zu-Quan Hu
- Engineering Research Center of Medical Biotechnology, Key Laboratory of Biology and Medical Engineering, Key Laboratory of Infectious Immune and Antibody Engineering in Guizhou Province, School of Biology and Engineering, Guizhou Medical University, Guiyang, 550025, Guizhou, China; Key Laboratory of Environmental Pollution Monitoring and Disease Control, China Ministry of Education (Guizhou Medical University), Guiyang, 550025, Guizhou, China
| | - Lei Tang
- Guizhou Provincial Engineering Technology Research Center for Chemical Drug R & D, School of Pharmacy, Guizhou Medical University, Guiyang, 550025, Guizhou, China.
| | - Hong-Mei Liu
- Engineering Research Center of Medical Biotechnology, Key Laboratory of Biology and Medical Engineering, Key Laboratory of Infectious Immune and Antibody Engineering in Guizhou Province, School of Biology and Engineering, Guizhou Medical University, Guiyang, 550025, Guizhou, China.
| | - Bing Wang
- Engineering Research Center of Medical Biotechnology, Key Laboratory of Biology and Medical Engineering, Key Laboratory of Infectious Immune and Antibody Engineering in Guizhou Province, School of Biology and Engineering, Guizhou Medical University, Guiyang, 550025, Guizhou, China; Key Laboratory of Microbiology and Parasitology of Education Department of Guizhou, School of Basic Medical Science, Guizhou Medical University, China; Key Laboratory of Environmental Pollution Monitoring and Disease Control, China Ministry of Education (Guizhou Medical University), Guiyang, 550025, Guizhou, China.
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