Dendritic polylysine based ανβ3 integrin targeted probe for near-infrared fluorescent imaging of glioma

Area of Science:

• Biomedical Engineering
• Optical Imaging
• Oncology

Background:

• Accurate glioma resection is challenging due to difficulties distinguishing tumor from healthy brain tissue.
• Existing probes often suffer from poor biodegradability, toxicity, and complex preparation.
• Targeted probes are crucial for precise glioma visualization and surgical guidance.

Purpose of the Study:

• To develop and evaluate a novel ανβ3 integrin-targeted near-infrared (NIR) fluorescent probe, DP-RGD, for glioma detection.
• To assess the probe's biocompatibility, targeting efficiency, and imaging capabilities in glioma models.
• To explore the potential of DP-RGD for image-guided glioma surgery.

Main Methods:

• Conjugation of dendritic polylysine (DP) with c(RGDyK) ligand and IR783 NIR dye to form the DP-RGD probe.
• Characterization of DP-RGD size (10-20 nm) and evaluation of its biodegradability and biocompatibility via cytotoxicity and histological analysis.
• NIR fluorescent imaging of glioma xenografts to assess tumor targeting efficiency and signal-to-noise ratio.

Main Results:

• The DP-RGD probe demonstrated good biocompatibility with no significant cytotoxicity.
• NIR imaging revealed high tumor targeting efficiency and precise visualization of glioma xenografts.
• A high tumor-to-normal tissue signal ratio was achieved, enabling clear differentiation.

Conclusions:

• The DP-RGD probe is a promising tool for noninvasive and precise glioma visualization.
• Its biodegradability and biocompatibility address limitations of previous probes.
• DP-RGD holds potential for guiding glioma resection using NIR fluorescent imaging.