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Related Concept Videos

Combined Effects of Drugs: Synergism01:27

Combined Effects of Drugs: Synergism

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Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
Such synergistic combinations...
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Antimicrobial Effectiveness01:28

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The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
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Combining two or more treatment methods increases the life span of cancer patients while reducing damage to vital organs or tissue from the overuse of a single treatment. Combination therapy also targets different cancer-inducing pathways, thus reducing the chances of developing resistance to treatment.
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Defense Against Bacterial Pathogens01:31

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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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Biological Methods for Microbial Control01:28

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Biological agents offer an effective means of controlling microbial growth by leveraging natural processes like predation, competition, and the secretion of antimicrobial substances.Predatory bacteria such as Bdellovibrio species target and kill pathogens like Salmonella and E. coli. They are widely used in poultry farms to control infections. Myxococcus species help combat plant-pathogenic fungi. These naturally occurring predators serve as eco-friendly alternatives to chemical pesticides and...
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Antimicrobial Proteins01:23

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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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Updated: Sep 6, 2025

Antimicrobial Synergy Testing by the Inkjet Printer-assisted Automated Checkerboard Array and the Manual Time-kill Method
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Two plus One: Combination Therapy Tri-systems Involving Two Membrane-Disrupting Antimicrobial Macromolecules and

Zeyu Shao1, Erna Wulandari1, Ruby C Y Lin2,3,4

  • 1Australian Centre for NanoMedicine (ACN), School of Chemical Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia.

ACS Infectious Diseases
|June 30, 2022
PubMed
Summary

This study introduces a novel tri-system combining membrane-disrupting agents and antibiotics to combat multidrug-resistant bacteria. The synergistic approach enhances efficacy and biocompatibility, offering a promising strategy for new antimicrobial therapies.

Keywords:
biocompatibilitycontrolled radical polymerizationmultidrug-resistant bacteriaselectivity indexsynergy

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High-throughput Identification of Synergistic Drug Combinations by the Overlap2 Method
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Quadruple-Checkerboard: A Modification of the Three-Dimensional Checkerboard for Studying Drug Combinations
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Area of Science:

  • Microbiology and Infectious Diseases
  • Drug Discovery and Development
  • Biotechnology

Background:

  • Multidrug-resistant (MDR) bacteria pose a significant global health threat, necessitating innovative therapeutic strategies.
  • Traditional antimicrobial agents often face challenges with toxicity and resistance development.
  • Combinatorial approaches are being explored to enhance efficacy and overcome resistance mechanisms.

Purpose of the Study:

  • To develop and evaluate a novel tri-system for experimental therapy against MDR bacteria.
  • To investigate the synergistic interactions, efficacy, and biocompatibility of a combination therapy.
  • To explore the potential of this strategy for safer clinical applications.

Main Methods:

  • Development of a tri-system co-administering a synthetic antimicrobial polymer (P), colistin methanesulfonate (Col), and antibiotics (doxycycline, rifampicin, or azithromycin).
  • Checkerboard assays to determine synergistic interactions against wild-type and MDR *Pseudomonas aeruginosa*.
  • Evaluation of bacteriostatic and bactericidal activities, and assessment of biocompatibility with murine embryonic fibroblast cells.

Main Results:

  • Synergistic interactions were observed in Col-antibiotic-P tri-systems, particularly Col-Dox-P, against *P. aeruginosa*.
  • The tri-systems demonstrated both bacteriostatic and bactericidal activities, with significant bacterial reduction (>99.999%) achieved rapidly.
  • The Col-Dox-P system showed a 16-fold increase in selectivity compared to polymer P alone, indicating improved biocompatibility and therapeutic index.

Conclusions:

  • The developed tri-system represents a promising combinatorial approach for combating MDR bacteria.
  • Synergy allows for lower dosages, enhancing efficacy while improving safety and selectivity.
  • This strategy holds potential for developing safer and more effective clinical antimicrobial therapies.