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Bacterial outer membrane vesicle nanorobot.

Songsong Tang1,2, Daitian Tang1,3,4, Houhong Zhou1,5

  • 1Institute of Urology, The Third Affiliated Hospital of Shenzhen University, Shenzhen 518000, People's Republic of China.

Proceedings of the National Academy of Sciences of the United States of America
|July 15, 2024
PubMed
Summary
This summary is machine-generated.

Enzyme-powered nanorobots made from bacterial outer membrane vesicles (OMVs) offer improved biocompatibility and targeted tumor therapy. These OMV nanorobots effectively deliver gene silencing tools and enhance immune response for superior tumor suppression.

Keywords:
bacterial outer membrane vesicleenzyme propulsionnanorobotssurface bioengineering

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Oncology

Background:

  • Current nanorobots often use inorganic materials, limiting biocompatibility and biological functions.
  • There is a need for advanced nanorobotic systems for precision therapy with enhanced efficacy.
  • Bacterial outer membrane vesicles (OMVs) offer intrinsic biocompatibility and versatile surface modification potential.

Purpose of the Study:

  • To develop novel enzyme-powered nanorobots using bacterial outer membrane vesicles (OMVs) for enhanced tumor therapy.
  • To engineer OMV nanorobots for targeted delivery of small interfering RNA (siRNA) and improved therapeutic outcomes.
  • To evaluate the efficacy of OMV nanorobots in vitro and in vivo for tumor suppression.

Main Methods:

  • Immobilized urease on OMV membranes to catalyze urea decomposition for nanorobot propulsion.
  • Surface bioengineering of OMV nanorobots with cell-penetrating peptides for tumor targeting.
  • Loading of small interfering RNA (siRNA) into OMVs for protection against degradation.
  • In vitro and in vivo studies using a rodent model, including orthotopic bladder tumor models.

Main Results:

  • Enzyme-powered OMV nanorobots demonstrated effective propulsion and enhanced tumor targeting.
  • OMV nanorobots successfully protected siRNA from enzymatic degradation and facilitated its delivery.
  • Significant enhancement in siRNA delivery and immune stimulation was observed compared to static controls.
  • Substantial tumor suppression was achieved in vivo, particularly in the orthotopic bladder tumor model.

Conclusions:

  • Enzyme-powered OMV nanorobots represent a promising platform for advanced precision cancer therapy.
  • These nanorobots offer improved biocompatibility, targeted delivery, and enhanced therapeutic efficacy.
  • The OMV nanorobot design opens new avenues for versatile and adaptable medical robots in biomedical applications.