Sonodynamic action of hypocrellin B on methicillin-resistant Staphylococcus aureus
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AbstractMethicillin-resistant Staphylococcus aureus (MRSA) commonly causes refractory infections and has recently become a serious public health concern. The present study was designed to investigate sonodynamic action of hypocrellin B on MRSA. A MRSA strain (ATCC BAA-43) was used in the present study. The dark toxicity of hypocrellin B on MRSA and its uptake in MRSA first were measured. And then bacteria were incubated with hypocrellin B and exposed to ultrasound. After sonodynamic treatment, colony forming unit assay and bacterial viability assay were conducted. Membrane permeability assay, DNA fragmentation assay, and DNA synthesis assay were also performed to examine the underlying mechanism. The results showed that hypocrellin B at concentrations of up to 500 mu M had no toxicity to MRSA in the dark. After incubation for 50 min, hypocrellin B could be maximally absorbed by MRSA, and exhibited significant sonodynamic activity in a dose-dependent manner. The 5-log reduction in colony forming unit (CFU) was observed after hypocrellin B (40 mu M) treatment at an intensity of 1.38 W/cm(2) ultrasound for 5 min. Compared to the control, hypocrellin B alone and ultrasound sonication alone group, more dead cells were found and bacterial membrane integrity was notably damaged after sonodynamic treatment of hypocrellin B. However, no remarkable DNA damage was found in MRSA after sonodynamic treatment of hypocrellin B. All the findings demonstrated that hypocrellin B could serve as a potential antibacterial sonosensitizer to significantly cause damage to the membrane integrity of MRSA and inhibit its growth under ultrasound sonication.
All Author(s) ListWang XN, Ip M, Leung AW, Wang P, Zhang HW, Hua HY, Xu CS
Journal nameUltrasonics
Volume Number65
Pages137 - 144
LanguagesEnglish-United Kingdom
KeywordsSonodynamic inactivation, Sonodynamic antibacterial chemotherapy, Hypocrellin B,Traditional Chinese medicines, Staphylococcus aureus, Drug-resistant bacteria
Web of Science Subject CategoriesAcoustics;Radiology, Nuclear Medicine & Medical Imaging;Acoustics;Radiology, Nuclear Medicine & Medical Imaging

Last updated on 2021-14-04 at 00:02