Related Experiment Video
Updated: Jun 13, 2026
09:57
A Facile and Efficient Approach for the Production of Reversible Disulfide Cross-linked Micelles
Published on: December 23, 2016
8.9K
Efficient Self-Immolative RAFT End Group Modification for Macromolecular Immunodrug Delivery.
Maximilian Scherger1, Yannick A Pilger2, Judith Stickdorn1
1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
Biomacromolecules
|April 24, 2023
Summary
Reversible addition-fragmentation chain-transfer (RAFT) polymerization enables creation of polymer-drug conjugates. These conjugates feature traceless linkers for controlled drug release, enhancing therapeutic efficacy and cellular uptake.
Area of Science:
- Polymer Chemistry
- Bioconjugation
- Drug Delivery Systems
Background:
- Reversible Addition-Fragmentation chain-transfer (RAFT) polymerization yields functional macromolecules.
- Poly(N,N-dimethylacrylamide) (pDMA) offers properties similar to poly(ethylene glycol) (PEG).
- Self-immolative linkers enable traceless drug release from polymer conjugates.
Purpose of the Study:
- To develop a versatile method for reversible polymer-drug conjugation using RAFT polymerization.
- To create polymer-drug conjugates with enhanced in vitro activity and cellular internalization.
- To explore the potential of pDMA-based conjugates for improved drug delivery.
Main Methods:
- One-pot synthesis of functionalized pDMA via RAFT polymerization.
- Introduction of primary/secondary amines and primary alcohols for conjugation.
- Creation of polymer-drug conjugates using self-immolative linkers.
- Evaluation of in vitro activity and cellular uptake via flow cytometry and confocal imaging.
Main Results:
- Efficient one-pot procedure for functionalizing pDMA with various groups.
- Demonstrated reversible conjugation and traceless release of drugs from pDMA.
- A polymer-drug conjugate showed significantly increased in vitro activity.
- Cholesterol-modified RAFT agent facilitated cellular internalization of conjugates.
Conclusions:
- RAFT polymerization provides a versatile platform for creating advanced polymer-drug conjugates.
- Self-immolative linkers enable controlled drug release and enhanced therapeutic outcomes.
- pDMA-based conjugates show promise for improved drug delivery and cellular targeting.
More Related Videos
Related Concept Videos
01:19Modified-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...
01:22Modified-Release Drug Delivery Systems: Rate-Programmed I
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,...
01:30Modified-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...
01:24Modified-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.
01:24Site-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...