Related Experiment Video

Updated: Aug 5, 2026

Targeting Biofilm Associated Staphylococcus aureus Using Resazurin Based Drug-susceptibility Assay
10:00

Targeting Biofilm Associated Staphylococcus aureus Using Resazurin Based Drug-susceptibility Assay

Published on: May 5, 2016

Astrakurkurone targets multidrug resistant Staphylococcus aureus biofilms through ROS-mediated cell membrane damage

Shrabasti Bandyopadhyay1, Soma Mondal2, Krishnendu Acharya3

  • 1Antimicrobial Resistance Research Laboratory, Department of Microbiology, University of Kalyani, Kalyani, Kalyani, West Bengal, 741235, India.

Microbial Pathogenesis
|July 27, 2026
PubMed

Insights

Astrakurkurone, a mushroom compound, effectively combats multidrug-resistant bacteria (MRSA) by inhibiting biofilms and virulence. It also acts as a beta-lactamase inhibitor and eliminates persister cells, offering a promising natural alternative for infections.

Area of Science:

  • Natural Product Chemistry
  • Microbiology
  • Antimicrobial Resistance

Background:

  • Methicillin-resistant Staphylococcus aureus (MRSA) presents a significant health challenge due to multidrug resistance (MDR) and biofilm formation.
  • Natural products offer a promising avenue for developing new strategies against resistant bacterial strains.

Purpose of the Study:

  • To investigate the antibacterial, antibiofilm, and antivirulence potential of the triterpenoid Astrakurkurone from Astraeus hygrometricus against MRSA.
  • To elucidate the mechanisms of action of Astrakurkurone, including its effects on quorum sensing, virulence factors, and beta-lactamase activity.

Main Methods:

  • Antibacterial efficacy was determined by minimum inhibitory concentrations (MICs).
  • Biofilm inhibition was assessed by quantifying biofilm mass and downregulating key virulence genes (agrA, sarA, bap, sasG, icaA, hla).
  • Mechanisms explored included staphyloxanthin inhibition, reactive oxygen species (ROS) generation, beta-lactamase inhibition (blaZ expression), and synergistic effects with cefoxitin.

Main Results:

  • Astrakurkurone demonstrated antibacterial activity against MRSA strains (MICs 150-300 μg/mL) and significantly inhibited biofilm formation.
  • It downregulated quorum sensing and virulence factors, inhibited staphyloxanthin, induced ROS accumulation, and acted as a beta-lactamase inhibitor.
  • Astrakurkurone eradicated mature biofilms from various medical device and tissue models and eliminated persister cells.

Conclusions:

  • Astrakurkurone exhibits significant antibiofilm, antivirulence, and antipersister properties against MRSA.
  • Its multifaceted mechanisms, including beta-lactamase inhibition, highlight its potential as a therapeutic agent.
  • Astrakurkurone shows promise for treating challenging infections, including those associated with medical implants and chronic conditions.
Keywords:
AstrakurkuroneBiofilmMethicillin resistant Staphylococcus aureusMultidrug resistancePhytochemical

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