Antibacterial and synergy of a flavanonol rhamnoside with antibiotics against clinical isolates of methicillin-resistant Staphylococcus aureus (MRSA)

作者：An, J.; Zuo, G. Y.^*; Hao, X. Y.; Wang, G. C.; Li, Z. S.

来源：Phytomedicine, 2011, 18(11): 990-993.

DOI：10.1016/j.phymed.2011.02.013

• Anti-MRSA activity
• Taxifolin-7-O-alpha-L-rhamnopyranoside
• Synergy
• Ceftazidime
• Levofloxacin

The in vitro antibacterial activity of taxifolin-7-O-alpha-L-rhamnopyranoside (TR) and its synergy with four conventional antibiotics (ampicillin (AMP), levofloxacin (LEV), ceftazidime (CAZ) and azithromycin (AZM)) against ten clinical isolates of methicillin-resistant staphylococcus aureus (MRSA) were evaluated, respectively. Individual MICs and MBCs were determined by microdilution methods following the CLSI guidelines. Anti-MRSA synergy effects were measured using the chequerboard and time-kill curve tests. MICs/MBCs (mu g/ml) ranges were 32-64/64-128 for TR alone against all 10 MRSA isolates. Chequer-board method showed that significant synergies were observed for the TR/CAZ and TR/LEV combinations with FICI ranged 0.187-0.375 and 0.25-0.5, respectively. Some synergy and additivity effects were also observed for TR/AMP and TR/AZM combinations. In the time-kill dynamic confirmation test, synergy results kept by the TR/CAZ combination (2.186 log(10) cfu/ml increase in killing), but the TR/LEV combination changed to additivity (1.839 log(10) cfu/ml increase in killing). These results demonstrated that TR enhanced the efficacy of CAZ and LEV in vitro, which had potential for combinatory therapy of patients infected with MRSA.

• 出版日期2011-8-15
• 单位成都军区昆明总医院; 贵州医科大学