Tumor-targeted drug delivery and sensitization by MMP2-responsive polymeric micelles

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Therapeutics

Background:

• Multidrug resistance (MDR) and poor tumor specificity limit anticancer drug efficacy.
• Developing targeted drug delivery systems is crucial for overcoming these challenges.

Purpose of the Study:

• To develop and evaluate matrix metalloproteinase 2 (MMP2)-sensitive self-assembling micelles (PEG2k-pp-PE) as a nanocarrier for targeted drug delivery and overcoming MDR.
• To assess the in vitro and in vivo performance of these micelles in various cancer models.

Main Methods:

• Micelles were assembled from PEG2k-pp-PE, a MMP2-sensitive self-assembling efflux inhibitor.
• In vitro studies evaluated cellular uptake, tissue penetration, and drug sensitization in MDR cancer cells and 3D spheroids.
• In vivo studies assessed tumor targeting, drug accumulation, retention, and anticancer activity in tumor models.

Main Results:

• PEG2k-pp-PE micelles enhanced cellular uptake and tissue penetration in MDR cancer models.
• The micelles demonstrated efflux inhibitory capability comparable to known P-glycoprotein (P-gp) inhibitors.
• In vivo, micelles achieved specific tumor delivery, increased drug accumulation and retention, leading to improved anticancer efficacy.

Conclusions:

• PEG2k-pp-PE micelles show potential as multifunctional nanocarriers for targeted drug delivery.
• These micelles can sensitize resistant cancers and improve overall anticancer activity.
• This approach offers a promising strategy for concurrent tumor targeting and overcoming drug resistance in cancer therapy.