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Related Concept Videos

Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

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Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...
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Nanobody-functionalized PEG-b-PCL polymersomes and their targeting study.

Tao Zou1, Fatimata Dembele1, Anne Beugnet2

  • 1Institut Curie-CNRS-Université Pierre & Marie Curie, Laboratoire Physico-Chimie Curie, UMR168, 26 Rue d'Ulm, 75248 Paris, France.

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|October 4, 2015
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Summary

We developed targeted polymersomes using biocompatible materials for potential cancer therapy. These nanobodies-equipped nanoparticles specifically bind to HER2-positive breast cancer cells, showing promise for drug delivery.

Keywords:
Cryo-TEMHER2NanobodyPEG-b-PCLPolymersomeTargeting

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Cancer Research

Background:

  • Development of targeted drug delivery systems is crucial for cancer therapy.
  • Polymersomes offer a versatile platform for nanomedicine due to their biocompatibility and biodegradability.
  • Nanobody functionalization enhances specificity in targeting cancer cells.

Purpose of the Study:

  • To create and characterize nanobody-functionalized polymersomes for targeted delivery to HER2-positive breast cancer cells.
  • To evaluate the specificity and binding capabilities of these novel nanoparticles.
  • To lay the groundwork for future in vivo studies in targeted drug delivery.

Main Methods:

  • Synthesis of functionalized poly(ethylene glycol)-block-poly(ϵ-caprolactone) (PEG-b-PCL) copolymers.
  • Preparation of polymersomes using thin film hydration and nanoprecipitation.
  • Characterization of polymersomes using cryogenic transmission electron microscopy (Cryo-TEM) and dynamic light scattering (DLS).
  • Functionalization with anti-HER2 nanobodies (VHH1) via maleimide-cysteine chemistry.
  • Assessment of cell binding specificity using flow cytometry and confocal microscopy.

Main Results:

  • Polymersomes with mean diameters around 150 nm were successfully prepared.
  • Nanoparticle functionalization with nanobodies (VHH1) resulted in specific binding to HER2-positive breast cancer cells.
  • Cryo-TEM confirmed vesicular structures, and DLS provided size and zeta-potential data.
  • Flow cytometry and confocal microscopy validated targeted cell binding.

Conclusions:

  • VHH1-functionalized PEG-b-PCL polymersomes demonstrate specific targeting of HER2-expressing breast cancer cells.
  • These findings represent a significant step towards developing targeted nanomedicines for breast cancer.
  • The study provides a strong foundation for further in vivo investigations of these targeted nanoparticles for drug delivery.