Related Experiment Video

Updated: Jul 29, 2025

Improved Enzyme Protection Assay to Study Staphylococcus aureus Internalization and Intracellular Efficacy of Antimicrobial Compounds
06:36

Improved Enzyme Protection Assay to Study Staphylococcus aureus Internalization and Intracellular Efficacy of Antimicrobial Compounds

Published on: September 8, 2021

2.8K

Antibacterial activity of paroxetine against Staphylococcus aureus and possible mechanisms of action

Vitória Pf Cabral1,2, Daniel S Rodrigues1,2, Amanda D Barbosa1,2

  • 1Faculdade de Farmácia, Laboratório de Bioprospecção em Moléculas Antimicrobianas (LABIMAN), Universidade Federal do Ceará, Fortaleza, CE, CEP: 60.430-372, Brasil.

Future Microbiology
|May 22, 2023
PubMed

Insights

Paroxetine exhibits antibacterial potential, showing additive effects with oxacillin against Staphylococcus aureus. This antidepressant may be repurposed as a novel antibacterial agent.

Area of Science:

  • Pharmacology
  • Microbiology
  • Drug Discovery

Background:

  • Staphylococcus aureus infections pose a significant public health threat, necessitating novel therapeutic strategies.
  • Antibiotic resistance in S. aureus strains, including methicillin-resistant Staphylococcus aureus (MRSA), complicates treatment options.
  • Drug repositioning offers a promising avenue for identifying new uses for existing medications.

Purpose of the Study:

  • To investigate the antibacterial activity of paroxetine, an antidepressant, against methicillin-sensitive and methicillin-resistant Staphylococcus aureus (MRSA) isolates.
  • To evaluate the synergistic or additive effects of combining paroxetine with oxacillin, a beta-lactam antibiotic.
  • To explore the potential mechanisms of action underlying paroxetine's antibacterial effects.

Main Methods:

  • Broth microdilution and checkerboard assays were employed to determine minimum inhibitory concentrations (MIC) and fractional inhibitory concentration indices.
  • Flow cytometry and fluorescence microscopy were utilized to assess effects on bacterial genetic material and cell membranes.
  • Scanning electron microscopy (SEM) was used for morphological analysis of bacterial cells treated with paroxetine.
  • Molecular docking studies were performed to predict interactions with potential bacterial targets.

Main Results:

  • Paroxetine demonstrated a minimum inhibitory concentration (MIC) of 64 μg/ml against Staphylococcus aureus.
  • The combination of paroxetine and oxacillin exhibited mostly additive interactions, suggesting a potential synergistic effect.
  • Evidence indicated that paroxetine affects bacterial genetic material and cell membranes, leading to morphological changes and influencing virulence factors.

Conclusions:

  • Paroxetine possesses significant antibacterial potential, particularly against Staphylococcus aureus.
  • The findings support the drug repositioning of paroxetine as a potential therapeutic agent for bacterial infections.
  • Further research into the precise mechanisms and clinical efficacy of paroxetine as an antibacterial is warranted.
Keywords:
Staphylococcus aureusflow cytometrymolecular dockingparoxetine

More Related Videos

Time-Lapse Epifluorescence Microscopy Imaging of Pseudomonas aeruginosa and Staphylococcus aureus Heterogeneous Phenotypes07:44

Time-Lapse Epifluorescence Microscopy Imaging of Pseudomonas aeruginosa and Staphylococcus aureus Heterogeneous Phenotypes

Published on: February 14, 2025

958
A Platform of Anti-biofilm Assays Suited to the Exploration of Natural Compound Libraries09:39

A Platform of Anti-biofilm Assays Suited to the Exploration of Natural Compound Libraries

Published on: December 27, 2016

17.8K

Related Concept Videos

Combined Effects of Drugs: Synergism01:27

Combined Effects of Drugs: Synergism

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...
4.1K
Development of Antibiotic Resistance01:30

Development of Antibiotic Resistance

Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
50
Nonlinear Pharmacokinetics: Dependence of Elimination Half-Life and Dose Clearance01:23

Nonlinear Pharmacokinetics: Dependence of Elimination Half-Life and Dose Clearance

The elimination half-life and drug clearance of drugs following nonlinear kinetics can vary with dosage. The Michaelis-Menten parameters and drug concentration influence these factors. As the dose increases, the elimination half-life tends to lengthen, resulting in a reduction in clearance and a disproportionately larger area under the curve. The total clearance can be derived from the Michaelis-Menten equation for drugs following a one-compartment model.
A study on guinea pigs examined the...
222
Antimicrobial Effectiveness01:28

Antimicrobial Effectiveness

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...
99
Gene Regulation in Microbial Communities: Quorum Sensing01:28

Gene Regulation in Microbial Communities: Quorum Sensing

Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
51
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
1.5K