pH-Responsive Zwitterionic Copolymer DHA-PBLG-PCB for Targeted Drug Delivery: A Computer Simulation Study.

Area of Science:

• Materials Science
• Polymer Chemistry
• Computational Chemistry

Background:

• Zwitterionic copolymers are promising for drug delivery applications.
• Understanding self-assembly behavior is crucial for designing effective drug carriers.
• Docosahexaenoic acid-based copolymers offer unique properties for biomedical applications.

Purpose of the Study:

• To investigate the self-assembled behavior of docosahexaenoic acid- b-poly(γ-benzyl-l-glutamate)- b-poly(carboxybetaine methacrylate) (DHA-PBLG-PCB) copolymer.
• To explore the loading and release mechanism of doxorubicin (DOX) from these self-assembled structures.
• To compare the self-assembly of DHA-PBLG-PCB with DHA-PBLG-PEG copolymers.

Main Methods:

• Dissipative Particle Dynamics (DPD) simulations were employed.
• The effects of polymer concentration, drug content, and pH were systematically studied.
• Comparative analysis with DHA-PBLG-PEG copolymer systems was performed.

Main Results:

• DHA-PBLG15-PCB10 copolymer self-assembles into stable core-shell micelles.
• The drug-loaded micelles exhibit pH-responsive behavior, encapsulating DOX at physiological pH and releasing it at acidic pH.
• The DHA-PBLG-PCB system demonstrated superior stability compared to DHA-PBLG-PEG.

Conclusions:

• The DHA-PBLG-PCB copolymer system shows significant potential as a stable and effective drug delivery vehicle.
• The pH-responsive nature of the micelles facilitates targeted drug release.
• These findings support the development of advanced nanocarriers for cancer therapy.