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Related Concept Videos

Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

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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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Modified-Release Drug Delivery Systems: Influencing Factors01:20

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Modified-release drug delivery systems are designed to optimize the therapeutic effect of drugs by minimizing side effects, reducing the dosage required, and controlling drug release to align with pharmacokinetic and pharmacodynamic needs. The system depends on two key factors: the drug's release from the formulation and its movement through the body to the target site. Unlike conventional dosage forms, where absorption is the limiting step, the rate of drug release is the key determinant in...
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Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

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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...
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Modified-Release Drug Delivery Systems: Rate-Programmed II01:19

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Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
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Modified-Release Drug Delivery Systems: Classification01:23

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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...
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Modified-Release Drug Delivery Systems: Rate-Programmed I01:22

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Rate-programmed drug delivery systems (DDS) are designed to release drugs at specific, controlled rates to maintain consistent therapeutic levels. These systems are categorized based on their release mechanisms, including dissolution-controlled DDS, diffusion-controlled DDS, and combined dissolution-diffusion-controlled DDS.In dissolution-controlled DDS, the release rate depends on the slow dissolution of the drug itself or the surrounding matrix. Drugs with inherently slow dissolution rates,...
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Combinatorial Synthesis of and High-throughput Protein Release from Polymer Film and Nanoparticle Libraries
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Determining dominant driving forces affecting controlled protein release from polymeric nanoparticles.

Josh Smith1, Kayla G Sprenger1, Rick Liao1

  • 1Department of Chemical Engineering, University of Washington, 105 Benson Hall, 3781 Okanogan Lane NE, Seattle, Washington 98195.

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Understanding protein-polymer interactions is key for enzyme encapsulation in nanostructures for drug delivery. This study reveals that polymer self-interaction, not just binding, significantly impacts protein release rates.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Computational Biology

Background:

  • Enzymes are vital therapeutics, necessitating efficient encapsulation in polymer nanostructures for drug delivery and catalysis.
  • Optimizing enzyme-loaded nanostructures requires a deep understanding of protein-polymer interactions.

Purpose of the Study:

  • To quantify molecular and mesoscale forces driving protein release from polymeric nanoparticles.
  • To correlate simulated protein-polymer interactions with experimental release rates.

Main Methods:

  • Classical molecular dynamics (MD) simulations of bovine serum albumin (BSA) with polymer surrogates (PLGA, PS-PLA, PLA).
  • Experimental determination of BSA release rates from nanoparticles made with corresponding polymers.
  • MD simulations of BSA with poly(styrene)-acrylate copolymer to explore encapsulation control.

Main Results:

  • Polymer self-interaction tendencies and macroscale properties significantly influence protein release rates.
  • Simulated polymer binding affinity correlates with experimental BSA release.
  • Tuning polymer self-interaction offers potential for enhanced enzyme encapsulation control.

Conclusions:

  • Protein release from polymeric nanoparticles is governed by both direct protein-polymer binding and polymer self-interaction.
  • Studying protein interactions with small polymer surrogates aids in understanding overall protein-polymer dynamics.
  • Findings provide insights for designing advanced nanocarriers for enzyme therapeutics.