Polymalic acid chlorotoxin nanoconjugate for near-infrared fluorescence guided resection of glioblastoma multiforme

Area of Science:

• Biomedical Engineering
• Oncology
• Nanotechnology

Background:

• Maximal surgical resection is crucial for glioma treatment.
• Tools for intraoperative tumor visualization are needed to improve surgical outcomes.
• Current methods lack specificity and high signal for effective glioma resection guidance.

Purpose of the Study:

• To design and evaluate a novel biodegradable fluorescent nano imaging agent (NIA) for enhanced glioma visualization during surgery.
• To achieve high specificity for glioma cells and superior fluorescence emission for improved intraoperative guidance.

Main Methods:

• Conjugation of polymalic acid (PMLA) with chlorotoxin, indocyanine green (ICG), and a tri-leucin peptide to create the NIA.
• In vitro characterization of NIA specificity for U87MG glioma cells.
• In vivo evaluation in a xenogeneic mouse model with human U87MG glioblastoma.

Main Results:

• The NIA demonstrated high specificity and internalization by U87MG glioma cells.
• Intravenous injection resulted in vivid, long-lasting tumor-specific fluorescence in vivo.
• The NIA significantly improved the visualization and resection of glioma tumors.

Conclusions:

• The developed NIA is a promising tool for intraoperative fluorescence-guided glioma surgery.
• Its high specificity and fluorescence properties can aid surgeons in achieving maximal tumor resection while sparing healthy brain tissue.
• The NIA's biodegradable nature and enhanced performance support its potential for clinical translation.