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Vancomycin-Lipopeptide Conjugates with High Antimicrobial Activity on Vancomycin-Resistant Enterococci.

Eric Mühlberg1, Florian Umstätter1, Cornelius Domhan2

  • 1Department of Nuclear Medicine, Heidelberg University Hospital, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany.

Pharmaceuticals (Basel, Switzerland)
|June 4, 2020
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Summary

Structural modification of vancomycin with peptides and fatty acids creates potent new antibiotics against multidrug-resistant bacteria. These vancomycin-lipopeptide conjugates show enhanced activity and improved biodistribution, offering a promising strategy against resistant infections.

Keywords:
antibioticsenterococcifatty acidsmultidrug-resistant bacteriapolycationic peptidesstructural modificationvancomycin

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Area of Science:

  • Microbiology
  • Medicinal Chemistry
  • Pharmacology

Background:

  • Multidrug-resistant bacteria pose a significant global health threat, with limited last-resort treatment options.
  • Vancomycin, a crucial glycopeptide antibiotic, faces resistance challenges, necessitating novel therapeutic strategies.

Purpose of the Study:

  • To develop and evaluate structurally modified vancomycin conjugates with enhanced antimicrobial activity against resistant bacteria.
  • To investigate the structure-activity relationship of vancomycin-lipopeptide conjugates, focusing on modification sites and fatty acid chain length.

Main Methods:

  • Synthesis of vancomycin conjugates by structural modification with polycationic peptides and fatty acid conjugation.
  • Antimicrobial activity testing against vancomycin-resistant enterococci.
  • In vitro and in vivo cytocompatibility assessments.
  • Radiolabeling for in vivo pharmacokinetic and biodistribution studies in Wistar rats using molecular imaging.

Main Results:

  • Synthesized vancomycin-lipopeptide conjugates demonstrated high antimicrobial potential against vancomycin-resistant enterococci.
  • Antimicrobial activity correlated with the length of the attached fatty acid chain.
  • Conjugates exhibited good in vitro and in vivo cytocompatibility.
  • Improved biodistribution compared to vancomycin was observed, with a shift from renal to hepatobiliary excretion for the most potent conjugate.

Conclusions:

  • Structural modification of existing antibiotics like vancomycin is a viable strategy to create potent agents against multidrug-resistant bacteria.
  • Vancomycin-lipopeptide conjugates represent a promising class of compounds with potential for treating severe resistant infections.
  • The modified compounds offer an improved pharmacokinetic and biodistribution profile compared to the parent drug.