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Oxidation-Responsive Polymer-Drug Conjugates with a Phenylboronic Ester Linker
Fang-Yi Qiu1, Mei Zhang1, Ran Ji1
1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
Macromolecular Rapid Communications
|August 23, 2015
Summary
New polymer-drug conjugates release Naproxen in response to oxidation. These nanoparticles offer controlled drug delivery, showing potential for various hydroxyl or amino group-containing drugs.
Area of Science:
- Nanomedicine
- Polymer Chemistry
- Drug Delivery Systems
Background:
- Polymer-drug conjugates offer advantages over traditional drug formulations, including enhanced drug loading and pharmacokinetics.
- Developing responsive nanocarriers is crucial for targeted and controlled drug release.
- Oxidation-responsive systems are of interest for specific biological environments.
Purpose of the Study:
- To synthesize and characterize novel oxidation-responsive polymer-drug conjugates.
- To investigate the drug release mechanism triggered by oxidative conditions.
- To evaluate the potential of these conjugates for delivering drugs like Naproxen.
Main Methods:
- Synthesis of amphiphilic block copolymers via reversible addition-fragmentation chain transfer (RAFT) polymerization.
- Formation of nanoparticles in aqueous buffer.
- Oxidation studies using hydrogen peroxide (H2O2) to trigger drug release.
- Analysis of drug release kinetics influenced by H2O2 concentration and polymer structure.
Main Results:
- Successfully synthesized poly(ethylene glycol)-polyacrylate block copolymers with Naproxen attached via a phenylboronic ester linker.
- Formed nanoparticles with sizes ranging from 150-300 nm in neutral aqueous buffer.
- Demonstrated rapid release of intact Naproxen upon exposure to H2O2 due to oxidation of the phenylboronic ester linker.
- Showed that drug release rate is dependent on H2O2 concentration and the length of the hydrophobic polymer segment.
Conclusions:
- Developed a novel class of oxidation-responsive polymer-drug conjugates.
- The phenylboronic ester linker provides a mechanism for controlled drug release in response to oxidative stimuli.
- These conjugates are a promising platform for nanomedicine, adaptable for other drugs with hydroxyl or amino groups.
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