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http://dx.doi.org/10.6116/kjh.2020.35.3.47.

The Antimicrobial Activity of Daehwangmokdan-tang against Methicillin-resistant Staphylococcus aureus  

Han, Hyoung-Sun (Department of Oriental Pharmacy, College of Pharmacy, Wonkwang University, Wonkwang Oriental Medicines Research Institute)
Kwon, Dong-Yeul (Department of Oriental Pharmacy, College of Pharmacy, Wonkwang University, Wonkwang Oriental Medicines Research Institute)
Kang, Ok-Hwa (Department of Oriental Pharmacy, College of Pharmacy, Wonkwang University, Wonkwang Oriental Medicines Research Institute)
Publication Information
The Korea Journal of Herbology / v.35, no.3, 2020 , pp. 47-54 More about this Journal
Abstract
Objective : Infectious diseases are a growing problem worldwide by Methicillin-resistant Staphylococcus aureus (MRSA). Daehwangmokdan-tang is one of the oriental medicine prescriptions contained in Principles and Practice of Eastern Medicine. This study investigated the antibacterial activity of EtOH 70% extracts of Daehwangmokdan-tang (DMT) which prescription is composed of oriental medicine against MRSA. Methods : The antimicrobial activity and active concentration of MRSA were verified by measuring the minimum inhibitory concentration (MIC) of DMT. In addition, the effects of the disease were checked by treating the existing antibiotics and large ethanol extract in parallel, and the extent of growth suppression was checked over time. In addition, cell membrane permeability experiment confirmed the effect of large DMT on the immunity mechanism of MRSA. Results : TThe minimum inhibitory concentration of DMT against MRSA is 500 ~ 2000 ㎍/㎖ by broth dilution method. In the checkerboard method, the combinations of DMT with antibiotics has partial synergistic effect or synergy effect and DMT markedly reduced the MICs of the antibiotics oxacillin (OX), gentamicin (GEN) against MRSA. In the inhibition of resistance mechanism of DMT against MRSA, the expression of resistance gene and protein about β-lactam antibiotic was reduced. Also, we observed the effect of DMT about cell membrane permeability against MRSA, and confirmed that DMT suppressed growth of strains by increasing cell membrane permeability and energy metabolism. Conclusion : Basis on the result, we speculate that DMT may be useful for the treatment of MRSA infections when used in combination with β-lactam antibiotic.
Keywords
Daehwangmokdan-tang (DMT); Methicillin-resistant Staphylococcus aureus (MRSA); Antimicrobial; Synergistic effect;
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