Polymer Nanoparticles Overcome Drug Resistance by a Dual-Targeting Apoptotic Signaling Pathway in Breast Cancer

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Therapy

Background:

• Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) therapy shows promise for cancer treatment by inducing apoptosis.
• Drug resistance and poor pharmacokinetics limit the clinical application of TRAIL-based therapies.
• Developing strategies to overcome resistance and improve TRAIL delivery is crucial for effective cancer treatment.

Purpose of the Study:

• To develop a near-infrared (NIR) light-responsive system for controlled activation of TRAIL-mediated apoptosis.
• To overcome TRAIL resistance in breast cancer cells using conjugated polymer nanoparticles (CPNs).
• To enhance synergistic therapeutic effects through dual-targeting of apoptotic signaling pathways.

Main Methods:

• Conjugated polymer nanoparticles (CPNs) were designed to encapsulate W-7 and a TRAIL gene construct.
• NIR light (808 nm laser) was used to trigger heat shock, initiating HSP70 promoter-driven TRAIL gene expression.
• CPNs facilitated localized W-7 release, targeting calmodulin (CaM) and promoting caspase-8 cleavage.

Main Results:

• CPNs successfully delivered the TRAIL gene and W-7 to breast cancer cells upon NIR laser irradiation.
• The combined treatment demonstrated significant synergistic apoptosis induction in both in vitro and in vivo models.
• The developed system showed low systemic toxicity while effectively targeting cancer cells.

Conclusions:

• NIR-triggered CPNs offer a remote-controlled strategy to activate TRAIL-mediated apoptosis, overcoming drug resistance.
• Dual-targeting of TRAIL signaling and calmodulin enhances cancer cell apoptosis, providing a promising therapeutic approach.
• This nanotechnology-based strategy holds potential for improving breast cancer treatment outcomes.