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Related Concept Videos

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...
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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.
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Related Experiment Video

Updated: Jun 6, 2025

Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
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Collateral Sensitivity to β-Lactam Antibiotics in Evolved Apramycin-Resistant MRSA.

Jingjing Wu1,2, Shiqian Wu1,2, Juan Liu1,2,3

  • 1State Key Laboratory for Animal Disease Control and Prevention, South China Agricultural University, Guangzhou 510642, China.

International Journal of Molecular Sciences
|November 27, 2024
PubMed
Summary
This summary is machine-generated.

Developing apramycin resistance in methicillin-resistant Staphylococcus aureus (MRSA) unexpectedly increased sensitivity to several beta-lactam antibiotics. This collateral sensitivity offers new therapeutic strategies against MRSA infections.

Keywords:
apramycincollateral sensitivitymethicillin-resistant Staphylococcus aureusβ-lactam antibiotics

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Area of Science:

  • Microbiology
  • Bacterial Resistance
  • Antibiotic Discovery

Background:

  • Collateral sensitivity is a phenomenon where resistance to one antibiotic confers sensitivity to another.
  • Methicillin-resistant Staphylococcus aureus (MRSA) is a significant public health concern due to its resistance to common antibiotics.

Purpose of the Study:

  • To investigate the collateral sensitivity of MRSA to beta-lactam antibiotics after developing resistance to apramycin.
  • To understand the underlying mechanisms of this induced collateral sensitivity.

Main Methods:

  • MRSA strains were exposed to increasing concentrations of apramycin to induce resistance.
  • The resulting resistant strains were tested for sensitivity to a panel of beta-lactam antibiotics.
  • Key molecular markers including beta-lactamase activity and mecA gene expression were analyzed.
  • Cellular functions such as proton motive force and efflux activity were assessed.

Main Results:

  • Acquisition of apramycin resistance in MRSA led to collateral sensitivity to multiple beta-lactam antibiotics (ampicillin, cephazolin, ceftriaxone, cefotaxime, cefepime, cefquinome).
  • This sensitivity correlated with reduced beta-lactamase activity and decreased mecA gene expression.
  • A decrease in proton motive force and reduced efflux pump activity were also observed.

Conclusions:

  • Induced apramycin resistance in MRSA results in collateral sensitivity to beta-lactam antibiotics.
  • The observed collateral sensitivity is linked to reduced beta-lactamase activity, lower mecA expression, diminished proton motive force, and decreased efflux.
  • These findings highlight the potential of collateral sensitivity as a therapeutic strategy against MRSA.