New combination approaches to combat methicillin-resistant Staphylococcus aureus (MRSA)

Area of Science:

• Pharmacology and Phytochemistry
• Microbiology
• Natural Product Chemistry

Background:

• Herbal products show antimicrobial potential, sometimes acting synergistically with antibiotics.
• Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant therapeutic challenge.
• Exploring natural compounds to potentiate existing antibiotics is crucial for combating antimicrobial resistance.

Purpose of the Study:

• To enhance the antibacterial activity of penicillin against MRSA by combining it with saponins from Zygophyllum album.
• To identify and characterize the active saponin compounds from Zygophyllum album.
• To evaluate the synergistic effects of the saponin fraction and penicillin against MRSA.

Main Methods:

• Extraction and purification of metabolites (saponins, sterols, phenolics) from Zygophyllum album using chromatography.
• Identification of saponin compounds using ultra-high-performance liquid chromatography coupled with mass spectrometry (UHPLC/QTOF-MS).
• Assessment of antibacterial activity and synergy using checkerboard and time-kill assays against MRSA.

Main Results:

• The saponin fraction (ZA-S) from Zygophyllum album demonstrated antibacterial activity against MRSA.
• UHPLC/QTOF-MS identified six major ursane-type triterpenoidal saponins and Oleanolic acid in the ZA-S fraction.
• Synergistic effects were observed, with specific combinations of penicillin and ZA-S significantly reducing MRSA viability (FIC index < 0.5 and log10 CFU reduction of 3.7).

Conclusions:

• The saponin fraction of Zygophyllum album exhibits promising synergistic activity with penicillin against MRSA.
• This combination therapy could serve as a potential model for developing novel antibacterial agents.
• Further research into these natural compounds may lead to new strategies against resistant bacterial infections.