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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: Site-Targeted01:24

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

Modified-Release Drug Delivery Systems: Rate-Programmed II

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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

Modified-Release Drug Delivery Systems: Classification

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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: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

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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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Related Experiment Video

Updated: Mar 5, 2026

Polymalic Acid-based Nano Biopolymers for Targeting of Multiple Tumor Markers: An Opportunity for Personalized Medicine?
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Engineered Polymer-Transferrin Conjugates as Self-Assembling Targeted Drug Delivery Systems.

Hiteshri Makwana1, Francesca Mastrotto1, Johannes P Magnusson1

  • 1School of Pharmacy, University of Nottingham , University Park, Nottingham NG7 2RD, United Kingdom.

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|March 29, 2017
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Summary

Engineered polymer-protein conjugates using transferrin (Tf) variants self-assemble into effective nanoparticles for targeted cancer drug delivery, improving therapeutic efficacy.

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Area of Science:

  • Bioconjugation Chemistry
  • Nanotechnology
  • Cancer Therapeutics

Background:

  • Polymer-protein conjugates offer advantages in drug delivery through receptor targeting and controlled release.
  • Transferrin (Tf) is a serum-stable protein suitable for targeting cancer cells.
  • Self-assembling polymers can serve as carriers for cytotoxic drugs.

Purpose of the Study:

  • To engineer specific transferrin (Tf) variants for self-assembling polymer conjugation.
  • To compare the drug delivery and cytotoxicity of engineered Tf-polymer conjugates versus non-selectively derivatized conjugates.
  • To investigate the role of nanoscale self-assembly in the efficacy of polymer-protein hybrid drug delivery systems.

Main Methods:

  • Engineered Tf variants with site-specific cysteine residues for polymer conjugation.
  • Synthesis and characterization of polymer-protein hybrids.
  • Evaluation of self-assembly, nanoparticle formation, drug loading (paclitaxel), and cytotoxicity in colon cancer cells.

Main Results:

  • Engineered Tf-polymer conjugates formed more defined nanoparticles than non-selectively derivatized ones.
  • The S415C Tf variant conjugate showed rapid uptake into Tf-receptor expressing cancer cells.
  • Drug-loaded S415C conjugate demonstrated comparable cytotoxicity to free paclitaxel, with nanoscale assembly being a key factor.

Conclusions:

  • Site-specific engineering of polymer-protein conjugates enhances nanoparticle self-assembly and drug delivery efficacy.
  • Nanoscale assembly, in addition to ligand-receptor interactions, is crucial for therapeutic delivery systems.
  • These findings provide new design principles for polymer-biopolymer hybrids in targeted cancer therapy.