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Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.
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Polymalic Acid-based Nano Biopolymers for Targeting of Multiple Tumor Markers: An Opportunity for Personalized Medicine?
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DNA Nanostructures for Targeted Antimicrobial Delivery.

Ioanna Mela1, Pedro P Vallejo-Ramirez1, Stanislaw Makarchuk1

  • 1Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK.

Angewandte Chemie (International Ed. in English)
|April 17, 2020
PubMed
Summary
This summary is machine-generated.

DNA origami nanostructures deliver antibacterial lysozyme effectively, outperforming free enzymes. This DNA nanotechnology offers a promising strategy against antibiotic-resistant bacteria.

Keywords:
DNA nanostructuresantimicrobialatomic force microscopybionanotechnologydSTORM

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Area of Science:

  • Nanotechnology
  • Biotechnology
  • Microbiology

Background:

  • Antibiotic resistance is a growing global health threat.
  • Novel drug delivery systems are needed to combat resistant bacteria.
  • Enzyme-based therapies offer an alternative to traditional antibiotics.

Purpose of the Study:

  • To develop and evaluate DNA origami nanostructures as a targeted delivery vehicle for the antibacterial enzyme lysozyme.
  • To assess the efficacy of lysozyme-loaded DNA origami against Gram-positive and Gram-negative bacteria.
  • To demonstrate the potential of DNA origami in addressing antibiotic resistance.

Main Methods:

  • Fabrication of aptamer-functionalized DNA origami nanostructures.
  • Characterization using direct stochastic optical reconstruction microscopy (dSTORM) and atomic force microscopy (AFM).
  • Assessment of bacterial binding using structured illumination microscopy (SIM).
  • Evaluation of antibacterial activity against Bacillus subtilis and Escherichia coli.

Main Results:

  • DNA origami nanostructures were successfully synthesized and functionalized with lysozyme.
  • The nanostructures demonstrated specific binding to bacterial targets.
  • Lysozyme-loaded DNA origami showed enhanced inhibition of bacterial growth compared to free lysozyme.
  • The system proved effective against both Gram-positive and Gram-negative bacteria.

Conclusions:

  • DNA origami serves as an efficient and specific nanocarrier for antibacterial enzymes.
  • This approach shows significant potential for combating antibiotic-resistant bacterial infections.
  • The study highlights DNA origami as a valuable tool in the development of next-generation antimicrobials.