Nucleobase-Functionalized Supramolecular Micelles with Tunable Physical Properties for Efficient Controlled Drug...

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Polymeric micelles are crucial for drug delivery due to their self-assembly properties.
• pH-responsive materials offer targeted drug release capabilities.
• Nucleobase pairing provides a mechanism for dynamic cross-linking in polymer networks.

Purpose of the Study:

• To develop novel pH-responsive polymeric micelles using complementary nucleobase functionalization.
• To investigate the self-assembly, stability, and drug release characteristics of these micelles.
• To evaluate their potential as nanocarriers for controlled drug delivery.

Main Methods:

• Synthesis of multi-uracil functionalized poly(ε-caprolactone) (U-PCL) and adenine end-capped poly(ethylene glycol) (BA-PEG).
• Formation of supramolecular polymer networks via adenine-thymine (A-U) base pairing.
• Characterization of micelle properties including critical micellization concentration, particle size, and stability.
• In vitro drug loading and release studies using doxorubicin (DOX) at different pH values.

Main Results:

• Successfully synthesized U-PCL and BA-PEG polymers with high affinity and specific recognition.
• Demonstrated the formation of stable supramolecular micelles with tunable properties.
• Achieved high doxorubicin loading capacity and excellent stability under physiological conditions (pH 7.4).
• Showed rapid and triggered doxorubicin release upon reduction of pH from 7.4 to 5.0.

Conclusions:

• Adenine-thymine functionalized polymeric micelles are effective pH-responsive nanocarriers.
• The A-U base pairing enables the formation of dynamic physical cross-links for tunable micelle properties.
• These micelles exhibit controlled drug release, showing promise for pharmaceutical applications in targeted drug delivery.