Antimicrobial activity and synergism of ursolic acid 3-O-α-L-arabinopyranoside with oxacillin against methicillin-resistant Staphylococcus aureus

  • Authors:
    • Tian Zhou
    • Zhi Li
    • Ok‑Hwa Kang
    • Su‑Hyun Mun
    • Yun‑Soo Seo
    • Ryong Kong
    • Dong-Won Shin
    • Xiang‑Qian Liu
    • Dong‑Yeul Kwon
  • View Affiliations

  • Published online on: August 14, 2017     https://doi.org/10.3892/ijmm.2017.3099
  • Pages: 1285-1293
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Abstract

The objective of the present study was to investigate the antibacterial activity of a single constituent, ursolic acid 3-O-α-L-arabinopyranoside (URS), isolated from the leaves of Acanthopanax henryi (Oliv.) Harms, alone and in combination with oxacillin (OXA) against methicillin-resistant Staphylococcus aureus (MRSA). A broth microdilution assay was used to determine the minimal inhibitory concentration (MIC). The synergistic effects of URS and OXA were determined using a checkerboard dilution test and time-kill curve assay. The mechanism of action of URS against MRSA was analyzed using a viability assay in the presence of a detergent and an ATPase inhibitor. Morphological changes in the URS-treated MRSA strains were evaluated via transmission electron microscopy (TEM). In addition, the producing penicillin-binding protein 2a (PBP2a) protein level was analyzed using western blotting. The MIC value of URS against MRSA was found to be 6.25 µg/ml and there was a partial synergistic effect between OXA and URS. The time-kill growth curves were suppressed by OXA combined with URS at a sub-inhibitory level. Compared to the optical density at 600 nm (OD600) value of URS alone (0.09 µg/ml), the OD600 values of the suspension in the presence of 0.09 µg/ml URS and 0.00001% Triton X-100 or 250 µg/ml N,N'-dicyclohexylcarbodiimide reduced by 56.6 and 85.9%, respectively. The TEM images of MRSA indicated damage to the cell wall, broken cell membranes and cell lysis following treatment with URS and OXA. Finally, an inhibitory effect on the expression of PBP2a protein was observed when cells were treated with URS and OXA compared with untreated controls. The present study suggested that URS was significantly active against MRSA infections and revealed the potential of URS as an effective natural antibiotic.
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October-2017
Volume 40 Issue 4

Print ISSN: 1107-3756
Online ISSN:1791-244X

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Spandidos Publications style
Zhou T, Li Z, Kang OH, Mun SH, Seo YS, Kong R, Shin D, Liu XQ and Kwon DY: Antimicrobial activity and synergism of ursolic acid 3-O-α-L-arabinopyranoside with oxacillin against methicillin-resistant Staphylococcus aureus. Int J Mol Med 40: 1285-1293, 2017.
APA
Zhou, T., Li, Z., Kang, O., Mun, S., Seo, Y., Kong, R. ... Kwon, D. (2017). Antimicrobial activity and synergism of ursolic acid 3-O-α-L-arabinopyranoside with oxacillin against methicillin-resistant Staphylococcus aureus. International Journal of Molecular Medicine, 40, 1285-1293. https://doi.org/10.3892/ijmm.2017.3099
MLA
Zhou, T., Li, Z., Kang, O., Mun, S., Seo, Y., Kong, R., Shin, D., Liu, X., Kwon, D."Antimicrobial activity and synergism of ursolic acid 3-O-α-L-arabinopyranoside with oxacillin against methicillin-resistant Staphylococcus aureus". International Journal of Molecular Medicine 40.4 (2017): 1285-1293.
Chicago
Zhou, T., Li, Z., Kang, O., Mun, S., Seo, Y., Kong, R., Shin, D., Liu, X., Kwon, D."Antimicrobial activity and synergism of ursolic acid 3-O-α-L-arabinopyranoside with oxacillin against methicillin-resistant Staphylococcus aureus". International Journal of Molecular Medicine 40, no. 4 (2017): 1285-1293. https://doi.org/10.3892/ijmm.2017.3099