antibacterial and synergy of berberines with antibacterial agents against clinical multi-drug resistant isolates of methicillin-resistant <em>staphylococcus aureus </em>(mrsa)
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2012
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Abstract
Antibacterial activity of berberine (Ber) and 8-acetonyl-dihydroberberine (A-Ber) alone and combined uses with antibacterial agents ampicillin (AMP), azithromycin (AZM), cefazolin (CFZ) and levofloxacin (LEV) was studied on 10 clinical isolates of SCCmec III type methicillin-resistant <em>Staphylococcus aureus </em>(MRSA). Susceptibility to each agent alone was tested using a broth microdilution method and the chequerboard and time-kill tests for the combined evaluations, respectively.<strong><em> </em></strong>The<strong> </strong>alone<strong> </strong>MICs/MBCs (mg/mL) ranges were 32–128/64–256 (Ber) and 32-128/128-512 (A-Ber). Significant synergies were observed for the Ber (A-Ber)/AZM and Ber (A-Ber)/LEV combinations against 90% of the tested MRSA strains, with fractional inhibitory concentration indices (FICIs) values ranged from 0.188 to 0.500. An additivity result was also observed for the Ber/AZM combination by time-kill curves. These results demonstrated for the first time that Ber and A-Ber enhanced the <em>in vitro</em> inhibitory efficacy of AZM and LEV to a same extent, which had potential for further investigation in combinatory therapeutic applications of patients infected with MRSA.
| Reference Key |
bian2012moleculesantibacterial
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| Authors | ;Zhong-Qi Bian;Yun-Ling Zhang;Gen-Chun Wang;Jun Han;Yang Li;Guo-Ying Zuo |
| Journal | Journal of ethnopharmacology |
| Year | 2012 |
| DOI |
10.3390/molecules170910322
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