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KMID : 1094720080130060758
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Biotechnology and Bioprocess Engineering
2008 Volume.13 No. 6 p.758 ~ p.764
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Synergistic effect between dieckol from Ecklonia stolonifera and β-lactams against methicillin-resistant Staphylococcus aureus
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Lee Dae-Sung
Kang Min-Seung
Hwang Hye-Jin
Eom Sung-Hwan
Yang Ji-Young
Lee Myung-Suk
Lee Won-Jae
Jeon You-Jin
Choi Jae-Sue
Kim Young-Mog
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Abstract
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We have been attempting for some time to discover a compound evidencing antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA). The dieckol isolated from Ecklonia stolonifera has been shown to exhibit antibacterial activity against methicillin-susceptible S. aureus (MSSA) and MRSA. The minimum inhibitory concentrations (MICs) of dieckol were determined in a range of 32 to 64 μg/mL against standard MSSA and MRSA strains. Furthermore, dieckol clearly reversed the high-level ampicillin and penicillin resistance of MRSA. The MICs of ampicillin against two standard strains of MRSA were dramatically reduced from 512 to 0.5 μg/mL in combination with 1/4 MIC of dieckol (16 μg/mL). The fractional inhibitory concentration (FIC) indices of ampicillin and penicillin were measured from 0.066 to 0.266 in combination with 8 or 16 μg/mL of dieckol against all tested MRSA strains, thereby suggesting that dieckol-ampicillin or dieckol-penicillin combinations exert a synergistic effect against MRSA. The results of this study indicate that dieckol, administered in combination with β-lactams, may prove effective in the treatment of MRSA infections. Our finding may also contribute to the development of an alternative phytotherapeutic anti-MRSA agent.
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KEYWORD
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antibacterial activity, dieckol, Ecklonia stolonifera, methicillin-resistant Staphylococcus aureus (MRSA)
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