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Related Concept Videos

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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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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Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also called...
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Modified-Release Drug Delivery Systems: Classification

Modified-release drug delivery systems improve drug efficacy and minimize side effects by controlling the rate and location of drug release. These systems fall into three categories: rate-programmed, stimuli-activated, and site-targeted.Rate-programmed systems release drugs at a predetermined rate, maintaining consistent therapeutic levels and reducing fluctuations that could lead to toxicity or subtherapeutic effects. These systems use polymeric matrices, reservoir-based designs, or osmotic...
Oral Drug Delivery Systems: Delayed-Release Systems01:11

Oral Drug Delivery Systems: Delayed-Release Systems

Delayed-release drug delivery systems are specialized pharmaceutical formulations designed to postpone the release of active compounds until the drug reaches a specific region of the gastrointestinal (GI) tract, typically the intestine. These systems are essential for drugs that may cause gastric irritation, are unstable in acidic environments, or need to exert therapeutic effects locally in the intestinal or colonic regions.The core feature of delayed-release systems is the use of enteric...

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Evaluation of Polymeric Gene Delivery Nanoparticles by Nanoparticle Tracking Analysis and High-throughput Flow Cytometry
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Published on: March 1, 2013

pH-sensitive polyketal nanoparticles for drug delivery.

Yang Wang1, Baisong Chang, Wuli Yang

  • 1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, China.

Journal of Nanoscience and Nanotechnology
|February 21, 2013
PubMed
Summary

pH-sensitive polyketal (PK3) nanoparticles effectively encapsulate both hydrophilic doxorubicin hydrochloride (DOX) and hydrophobic paclitaxel (PTX). These biocompatible nanoparticles demonstrate pH-dependent drug release and potent anticancer activity, showing promise for dual-drug delivery.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Drug Delivery Systems

Background:

  • Development of effective drug delivery systems is crucial for cancer therapy.
  • Encapsulating both hydrophilic and hydrophobic drugs presents a significant challenge.
  • Polyketal copolymers offer tunable properties for nanoparticle formulation.

Purpose of the Study:

  • To formulate pH-sensitive polyketal (PK3) nanoparticles for co-delivery of doxorubicin hydrochloride (DOX) and paclitaxel (PTX).
  • To evaluate the drug loading efficiency, pH-dependent release, and in vitro cytotoxicity of these nanoparticles.

Main Methods:

  • Synthesis of polyketal PK3 copolymer via acetal exchange.
  • Fabrication of DOX-loaded nanoparticles using a modified double emulsion method.
  • Preparation of PTX-loaded nanoparticles via a single emulsion method.
  • In vitro drug release studies at different pH conditions.
  • Cytotoxicity assays using blank and drug-loaded nanoparticles.

Main Results:

  • Drug loading content increased with higher drug/polymer ratios.
  • Paclitaxel (PTX) exhibited higher entrapment efficiency compared to doxorubicin hydrochloride (DOX).
  • Both DOX and PTX release were significantly faster in acidic environments than in neutral conditions.
  • PK3 nanoparticles demonstrated good biocompatibility, and drug-loaded nanoparticles showed efficient cancer cell killing.

Conclusions:

  • pH-sensitive PK3 nanoparticles are effective carriers for both hydrophilic (DOX) and hydrophobic (PTX) anticancer drugs.
  • The pH-dependent release mechanism enhances therapeutic potential.
  • These nanoparticles represent a promising platform for combination cancer therapy.