Synergistic interactions of epigallocatechin gallate and oxytetracycline against various drug resistant Staphylococcus aureus strains in vitro
Language English Country Germany Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
23485046
DOI
10.1016/j.phymed.2012.12.010
PII: S0944-7113(12)00517-X
Knihovny.cz E-resources
- MeSH
- Anti-Bacterial Agents pharmacology MeSH
- Tea chemistry MeSH
- Erythromycin pharmacology MeSH
- Catechin analogs & derivatives pharmacology MeSH
- Plant Leaves chemistry MeSH
- Methicillin-Resistant Staphylococcus aureus drug effects MeSH
- Microbial Sensitivity Tests MeSH
- Drug Resistance, Multiple, Bacterial MeSH
- Oxytetracycline pharmacology MeSH
- Methicillin Resistance MeSH
- Tetracycline Resistance MeSH
- Drug Synergism MeSH
- Tetracycline pharmacology MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Anti-Bacterial Agents MeSH
- Tea MeSH
- epigallocatechin gallate MeSH Browser
- Erythromycin MeSH
- Catechin MeSH
- Oxytetracycline MeSH
- Tetracycline MeSH
Epigallocatechin gallate (EGCG), the major catechin contained in tea leaves, is known to possess the synergistic anti-staphylococcal activity in combination with various β-lactam antibiotics and tetracycline. In the present study, we explored the in vitro combinatory effect of EGCG in combination with oxytetracycline against eight standard strains and clinical isolates of Staphylococcus aureus, including erythromycin, methicillin and tetracycline resistant strains. The minimum inhibitory concentrations were determined by the broth microdilution assay and the data were evaluated according to the sum of fractional inhibitory concentrations (∑FIC). Our results showed synergistic and additive interactions against all S. aureus strains tested (∑FIC 0.288-0.631), two of which were multidrug resistant. According to our best knowledge, it is the first report on the EGCG synergy with oxytetracycline. Considering its significant synergistic antimicrobial effect and low toxicity, we suggest EGCG as a promising compound for the development of new anti-staphylococcal formulations.
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