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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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Body:Improving a drug's stability in the gastrointestinal (GI) tract is paramount for enhancing its bioavailability and therapeutic effectiveness. Various strategies are employed to protect the drug from the harsh gastric milieu and to ensure its release and absorption at the desired site within the GI tract.Polymer coatings are one such method used to shield drugs from the stomach's acidic environment. By preventing premature drug release, these coatings improve the bioavailability of unstable...
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Intra-lymph Node Injection of Biodegradable Polymer Particles
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Improved 225Ac daughter retention in InPO4 containing polymersomes.

R M de Kruijff1, K Drost1, L Thijssen2

  • 1Radiation Science and Technology, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|July 23, 2017
PubMed
Summary
This summary is machine-generated.

Alpha-emitting actinium-225 (225Ac) cancer therapy is improved by polymersomes that retain recoiling daughter nuclides. These novel vesicles enhance therapeutic efficacy by preventing off-target toxicity, making them promising for targeted cancer treatment.

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Area of Science:

  • Nuclear Medicine
  • Materials Science
  • Radiochemistry

Background:

  • Alpha-emitting radionuclides like actinium-225 (225Ac) show promise for treating metastatic cancers due to their long half-lives.
  • A key challenge is retaining recoiling daughter nuclides, which can cause toxicity in healthy tissues after alpha emission.
  • Polymersomes offer a potential solution for transporting and retaining these radioactive agents.

Purpose of the Study:

  • To design and evaluate polymersomes for improved retention of alpha-emitting daughter nuclides.
  • To investigate the impact of vesicle design, including nanoparticle inclusion and size, on recoil retention.
  • To compare the performance of these novel polymersomes against existing methods.

Main Methods:

  • Utilized Geant4 Monte Carlo simulations to model ideal polymersome designs for recoil retention.
  • Synthesized polymersomes containing InPO4 nanoparticles in the core.
  • Experimentally determined the recoil retention of daughter nuclides francium-221 (221Fr) and bismuth-213 (213Bi) in polymersomes of varying sizes.

Main Results:

  • Simulations identified polymersomes with InPO4 nanoparticles as optimal for recoil retention.
  • Synthesized 100nm polymersomes significantly improved recoil retention of 221Fr (57 ± 5%) and 213Bi (40 ± 2%) compared to previous methods.
  • Expanded simulations considered vesicle polydispersity and nanoparticle position to further understand retention parameters.

Conclusions:

  • Polymersomes encapsulating InPO4 nanoparticles demonstrate superior retention of recoiling daughter nuclides.
  • This enhanced retention minimizes off-target toxicity, improving the safety profile of 225Ac-based therapies.
  • The developed polymersome system is highly suitable for future in vivo validation in targeted cancer treatment.