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

Modified-Release Drug Delivery Systems: Rate-Programmed II

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...
Modified-Release Drug Delivery Systems: Site-Targeted01:24

Modified-Release Drug Delivery Systems: Site-Targeted

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.
Modified-Release Drug Delivery Systems: Classification01:23

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...
Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

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...
Modified-Release Drug Delivery Systems: Overview01:19

Modified-Release Drug Delivery Systems: Overview

Modified-release dosage forms are designed to address the limitations of drugs with short biological half-lives. These forms maintain stable therapeutic drug concentrations over extended periods, reducing the need for frequent dosing. A consistent drug level helps minimize peak-trough fluctuations, which can reduce adverse effects, lower the risk of drug resistance, and improve overall treatment effectiveness.One common type of modified-release form is the extended-release (ER) formulation. ER...

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Related Experiment Video

Updated: May 24, 2026

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

Recombinant protein-based polymers for advanced drug delivery.

Jordan L Frandsen1, Hamidreza Ghandehari

  • 1Department of Bioengineering, University of Utah, Salt Lake City, Utah, USA.

Chemical Society Reviews
|February 21, 2012
PubMed
Summary

Recombinant polymers offer precise control over structure for advanced drug delivery systems. Future research will guide the clinical translation of these engineered biomaterials.

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Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Genetic Engineering

Background:

  • Conventional polymer synthesis for drug delivery has limitations in precise structural characterization.
  • Recombinant techniques enable exquisite control over polymer sequence and length, correlating structure with function.
  • Natural protein motifs like elastin-like and silk-like polymers offer valuable physicochemical properties for drug delivery.

Purpose of the Study:

  • To review progress in the design and utility of recombinant polymers for drug and gene delivery.
  • To discuss challenges and future directions for clinical applications of these advanced materials.
  • To highlight the potential of genetically engineered polymers in creating precise and effective delivery systems.

Main Methods:

  • Utilizing genetic encoding for precise amino acid sequencing and production of monodisperse polymers.
  • Investigating protein-based polymers derived from natural motifs (e.g., elastin-like, silk-like) and de novo designs.
  • Summarizing fundamental research findings on structure-function relationships in recombinant polymers.

Main Results:

  • Recombinant polymers allow for unprecedented control over polymer architecture, leading to tailored physicochemical properties.
  • Engineered protein polymers demonstrate promise for drug and gene delivery applications.
  • Fundamental research provides insights for designing safe and effective clinical systems, though direct clinical applications are not yet realized.

Conclusions:

  • Recombinant polymers represent a significant advancement over chemically synthesized polymers for drug delivery.
  • Precise structural control in recombinant polymers is key to optimizing function and guiding future development.
  • Lessons learned from current research are crucial for the future clinical translation of recombinant polymer-based delivery systems.