Core-shell nanosized assemblies mediated by the alpha-beta cyclodextrin dimer with a tumor-triggered targeting...

Area of Science:

• Biomaterials Science
• Nanotechnology
• Drug Delivery Systems

Background:

• Self-assembled nanostructures are crucial for targeted drug delivery.
• Host-guest interactions offer precise control over molecular assembly.
• Targeting ligands like RGD peptides enhance cellular uptake in cancer therapy.

Purpose of the Study:

• To design and synthesize novel noncovalently connected micelles (NCCMs) using alpha-beta cyclodextrin dimers.
• To develop a tumor-triggered targeting system by incorporating RGD peptides and PEGylation.
• To investigate the controlled release of drugs and the efficacy of the tumor-triggered targeting strategy.

Main Methods:

• Synthesis of alpha-beta cyclodextrin dimers via "click" chemistry.
• Formation of self-assembled NCCMs through host-guest interactions.
• Conjugation of RGD peptide and fluorescent dyes; PEGylation using benzoic-imine bonds.
• Evaluation of tumor-triggered targeting and drug release kinetics.

Main Results:

• Successfully formed self-assembled NCCMs with connected hydrophilic and hydrophobic segments.
• Demonstrated "tumor-triggered targeting" where RGD ligand efficacy is activated post-PEG removal at the tumor site.
• Achieved rapid drug release upon PEG deshielding due to thermoinduced phase transition.
• Confirmed micelle formation and assembly tracking using fluorescent dyes.

Conclusions:

• The developed NCCMs with "tumor-triggered targeting" offer a novel strategy for enhanced cancer treatment.
• This approach allows for precise activation of targeting and drug release specifically within the tumor microenvironment.
• The system shows significant potential for improving therapeutic outcomes in cancer therapy.