Engineering discoidal polymeric nanoconstructs with enhanced magneto-optical properties for tumor imaging

Area of Science:

• Biomaterials Science
• Nanotechnology
• Drug Delivery

Background:

• Nanoparticle performance is dictated by size, shape, and surface properties.
• Current fabrication methods lack precise, multi-scale control over these features.

Purpose of the Study:

• To develop discoidal polymeric nanoconstructs (DPNs) with controlled dimensions.
• To investigate the properties and potential theranostic applications of these DPNs.

Main Methods:

• A modified hydrogel-template strategy was employed for DPN synthesis.
• DPNs were fabricated in a single step using PLGA, PEG dimethacrylate, ultra-small super-paramagnetic iron oxide nanoparticles (SPIOs), and Rhodamine B dye (RhB).
• Characterization involved microscopy techniques, pH-dependent release studies, and magnetic manipulation assessments.

Main Results:

• DPNs with a diameter of 1000 nm and height of 500 nm were successfully fabricated.
• Rhodamine B release was pH-dependent, increasing under acidic conditions.
• DPNs exhibited efficient magnetic field-guided movement and significantly enhanced MRI relaxivity (r2 ~ 500 (mMs)(-1)) due to SPIO confinement.

Conclusions:

• The developed DPNs offer precise control over nanoparticle features.
• These nanoconstructs demonstrate potential as theranostic agents for anti-angiogenic therapy and vascular imaging.
• The fabrication strategy provides a general approach for engineering advanced nanomedicine systems.