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Targeting methicillin-resistant Staphylococcus aureus: The comprehensive action of ent-kaurane diterpenoids on
Yuan Yang1, Xiangyun Tan2, Jie Tu3
1Institute of Maternal and Child Health, Wuhan Children's Hospital (Wuhan Maternal and Child Healthcare Hospital), Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China.
Abstract:
Methicillin-resistant Staphylococcus aureus (MRSA) represents a considerable challenge to global health owing to its resistance to antibiotics. In our prior research, we identified four ent-kaurane diterpenoids (compounds 1-4) isolated from Siegesbeckia orientalis L., which exhibited anti-MRSA activity. Nevertheless, the precise mechanisms by which these compounds exert their effects remain to be fully elucidated. This study aims to comprehensively evaluate the anti-MRSA properties and explore the biological processes associated with the activity of compounds 1-4. We utilized the minimum broth dilution method, electron microscopy, and membrane integrity assays to demonstrate that these compounds inhibit the growth of MRSA by disrupting cell wall and membrane structures. Additionally, crystal violet staining confirmed their efficacy in disrupting mature biofilms. In a murine model of bacteremia, the tested compounds 1-4 demonstrated a reduction in septic symptoms and exhibited favorable biosafety profiles, with compound 1 showing the most significant antibacterial effects. Transcriptomic analysis indicated that compound 1 disrupts peptidoglycan synthesis and interferes with the metabolism of cell wall precursors. Furthermore, it modulates the expression of genes associated with ion transport and membrane-related metabolic enzymes, thereby compromising the integrity of both the cell wall and the cytoplasmic membrane. In conclusion, this study systematically characterizes the anti-MRSA activity of the diterpenoid components derived from S. orientalis and identifies key biological processes and gene expression changes linked to their effects, and presents a promising new strategy for the development of natural anti-MRSA pharmaceuticals.
Insights
Four natural compounds from Siegesbeckia orientalis L. effectively combat Methicillin-resistant Staphylococcus aureus (MRSA) by disrupting cell walls and membranes. Compound 1 shows the most potent antibacterial effects, offering a promising natural pharmaceutical strategy.
Area of Science:
- Natural Product Chemistry
- Microbiology
- Pharmacology
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant global health threat due to antibiotic resistance.
- Four ent-kaurane diterpenoids (compounds 1-4) from Siegesbeckia orientalis L. previously showed anti-MRSA activity.
- The exact mechanisms of action for these compounds were not fully understood.
Purpose of the Study:
- To comprehensively evaluate the anti-MRSA properties of compounds 1-4.
- To elucidate the biological processes underlying their antibacterial activity.
- To explore their potential as natural pharmaceuticals against MRSA.
Main Methods:
- Minimum broth dilution, electron microscopy, and membrane integrity assays were used to assess growth inhibition and structural disruption.
- Crystal violet staining evaluated biofilm disruption.
- A murine bacteremia model assessed in vivo efficacy and biosafety.
- Transcriptomic analysis identified molecular targets and pathways.
Main Results:
- Compounds 1-4 inhibited MRSA growth by disrupting cell wall and membrane structures.
- They effectively disrupted mature MRSA biofilms.
- In vivo studies showed reduced septic symptoms with favorable safety profiles, particularly for compound 1.
- Compound 1 was found to disrupt peptidoglycan synthesis and interfere with cell wall precursor metabolism, modulating genes related to ion transport and membrane enzymes.
Conclusions:
- The diterpenoids from S. orientalis L. exhibit significant anti-MRSA activity through cell wall and membrane disruption.
- Compound 1 demonstrates potent antibacterial effects by targeting key metabolic and structural pathways.
- These findings highlight a promising natural pharmaceutical strategy for developing new anti-MRSA treatments.
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