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Engineering Cylindrical Macromolecular Assemblies With Zwitterionic Amino Acids for Concurrent Prolonged Circulation
Jokichi Fukushima1, Noriko Miyamoto2, Shota Fujii3
1Department of Chemistry and Materials Science, Shinshu University, Ueda, Nagano, Japan.
Small (Weinheim an Der Bergstrasse, Germany)
|March 25, 2026
Summary
This study introduces a novel drug delivery system using zwitterionic amino acids and polymer self-assembly. The design enhances tumor targeting while evading immune detection, leading to improved drug accumulation and cancer treatment.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Drug Delivery Systems
Background:
- Designing effective drug delivery systems faces challenges balancing active targeting with immune evasion.
- Current strategies often struggle to achieve both selective tumor accumulation and prolonged circulation.
- A molecular design integrating interfacial chemistry and morphology is needed to overcome these limitations.
Purpose of the Study:
- To develop a novel molecular design for drug delivery carriers that integrates zwitterionic amino acid interfaces and morphological control.
- To enable simultaneous active targeting of tumor cells and evasion of immune system recognition.
- To create a versatile platform for enhanced drug delivery and therapeutic efficacy.
Main Methods:
- Synthesis of amphiphilic graft polymers with hydrophilic backbones (zwitterionic amino acids) and hydrophobic side chains (poly(propylene oxide)).
- Self-assembly of polymers into short cylindrical micelles.
- Evaluation of micelle uptake by tumor cells versus macrophages.
- Loading micelles with photosensitizer IR780 for photodynamic and thermal therapy.
Main Results:
- The cylindrical micelles demonstrated preferential uptake by tumor cells expressing amino acid transporters.
- Macrophage internalization was minimized, leading to prolonged blood circulation and significant tumor accumulation.
- The zwitterionic surface and cylindrical morphology reduced nonspecific uptake and enhanced transporter interactions.
- IR780-loaded micelles effectively generated reactive oxygen species and heat, inducing apoptosis and inhibiting tumor growth.
Conclusions:
- A molecular design strategy successfully resolved the trade-off between tumor targeting and immune evasion.
- Integration of interfacial chemistry (zwitterionic amino acids) and morphology control (cylindrical micelles) is key.
- This structure-function coupling offers a new direction for designing drug delivery carriers with selective accumulation and prolonged circulation.
