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Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

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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Protein nanocapsule weaved with enzymatically degradable polymeric network.

Zhen Gu1, Ming Yan, Biliang Hu

  • 1Department of Chemical and Biomolecular Engineering, California NanoSystems Institute, University of California at Los Angeles, Los Angeles, California 90095, USA.

Nano Letters
|December 10, 2009
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Summary
This summary is machine-generated.

Researchers developed novel polymeric nanocapsules for controlled protein delivery. These nanocapsules release therapeutic proteins, like caspase-3, specifically within cancer cells, offering a new targeted therapy approach.

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Combinatorial Synthesis of and High-throughput Protein Release from Polymer Film and Nanoparticle Libraries
10:58

Combinatorial Synthesis of and High-throughput Protein Release from Polymer Film and Nanoparticle Libraries

Published on: September 6, 2012

Area of Science:

  • Biomaterials Science
  • Drug Delivery Systems
  • Nanotechnology

Background:

  • Protein therapeutics offer significant therapeutic potential but face challenges in targeted delivery and stability.
  • Controlled release mechanisms are crucial for maximizing therapeutic efficacy and minimizing off-target effects.
  • Current protein delivery systems often lack precise spatiotemporal control over cargo release.

Purpose of the Study:

  • To develop a novel nanocapsule system for the functional encapsulation and targeted delivery of protein therapeutics.
  • To engineer a protease-cleavable peptide cross-linker for controlled protein release within cells.
  • To demonstrate spatiotemporal control over protein release using photolabile moieties and validate its utility in cancer therapy.

Main Methods:

  • Interfacial polymerization was employed to create cocoon-like polymeric nanocapsules.
  • Peptide cross-linkers, modified with photolabile groups, were used to encapsulate protein cargo.
  • Protease-mediated degradation of the cross-linker was investigated for cargo release kinetics.
  • The system's efficacy was demonstrated through the cytoplasmic delivery of caspase-3 to cancer cells.

Main Results:

  • Polymeric nanocapsules successfully encapsulated functional target proteins.
  • Protease-cleavable peptide cross-linkers enabled controlled protein release.
  • Photolabile moieties allowed for spatiotemporal regulation of the degradation and release process.
  • Effective cytoplasmic delivery of apoptosis-inducing caspase-3 to cancer cells was achieved, leading to apoptosis.

Conclusions:

  • The developed nanocapsule system provides a versatile platform for the controlled delivery of protein therapeutics.
  • The protease-mediated and phototunable release mechanism offers precise spatiotemporal control over drug delivery.
  • This approach holds promise for targeted cancer therapy by enabling the delivery of cytotoxic proteins directly to cancer cells.