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Development and Assessment of Intracellular Infection Models for Staphylococcus aureus
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Development and Assessment of Intracellular Infection Models for Staphylococcus aureus

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Increased intracellular activity of MP1102 and NZ2114 against Staphylococcus aureus in vitro and in vivo

Xiao Wang1,2, Xiumin Wang3,4, Da Teng1,2

  • 1Key Laboratory of Feed Biotechnology, Ministry of Agriculture, Beijing, 100081, P. R. China.

Scientific Reports
|March 11, 2018
PubMed

Insights

Plectasin derivatives MP1102/NZ2114 show promise in treating intracellular Staphylococcus aureus infections, including multidrug-resistant strains. These compounds demonstrated significant efficacy in both cellular and mouse models, outperforming vancomycin in some cases.

Area of Science:

  • Microbiology
  • Pharmacology
  • Infectious Diseases

Background:

  • Staphylococcus aureus infections are difficult to treat due to intracellular survival and multidrug resistance.
  • Existing treatments face challenges in overcoming intracellular bacterial activity.

Purpose of the Study:

  • To investigate the extracellular and intracellular activities of plectasin derivatives MP1102/NZ2114 against Staphylococcus aureus (MSSA/MRSA).
  • To evaluate the efficacy of MP1102/NZ2114 in cellular and murine models of infection.

Main Methods:

  • Assessed antibacterial activity in a simulated phagolysosomal environment.
  • Investigated cellular uptake mechanisms (clathrin-mediated endocytosis, macropinocytosis).
  • Evaluated efficacy in RAW 264.7 macrophages and mouse models (peritonitis).
  • Measured cytokine regulation (TNF-α, IL-1β, IL-10).

Main Results:

  • MP1102/NZ2114 exhibited potent extracellular activity (>5-log CFU reduction).
  • Intracellular efficacy ranged from 0.42-1.07-log CFU reduction against resistant strains.
  • In a mouse model, MP1102/NZ2114 outperformed vancomycin against MSSA and showed comparable efficacy against MRSA.
  • Activity against a highly virulent strain was notable, though less than vancomycin.

Conclusions:

  • Plectasin derivatives MP1102/NZ2114 demonstrate significant potential for treating intracellular Staphylococcus aureus infections.
  • These compounds offer a promising therapeutic strategy against multidrug-resistant strains.
  • Further development is warranted for MP1102/NZ2114 as anti-staphylococcal agents.

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