Targeted delivery in breast cancer cells via iodine: nuclear localization sequence conjugate

Area of Science:

• Biomedical Engineering
• Gene Therapy
• Nanotechnology

Background:

• Nonviral vectors are crucial for gene therapy but often face challenges with targeted delivery and efficiency.
• Targeting specific cancer cells, like breast cancer, requires specialized vector design.
• Enhancing cellular internalization and nuclear accumulation are key to improving transfection efficiency.

Purpose of the Study:

• To fabricate and evaluate a novel nonviral vector, NLS-I, for targeted gene delivery to breast cancer cells.
• To investigate the role of the iodine-nuclear localization sequence (NLS-I) in enhancing vector performance.
• To compare the efficacy of the NLS-I vector in breast cancer cells versus control cells.

Main Methods:

• Fabrication of a nonviral vector (NLS-I) using NLS-I peptides, PEI 1800, and DNA.
• Formation of ternary complexes via charge interactions.
• Assessment of cellular internalization, nuclear accumulation, and transfection efficiency using MCF-7 (breast cancer) and HeLa (control) cells.
• Quantification of luciferase reporter gene expression.

Main Results:

• In MCF-7 cells, NLS-I significantly increased cellular internalization and nuclear accumulation compared to NLS.
• PEI1800/DNA/NLS-I complexes showed up to a 130-fold enhancement in luciferase reporter gene expression in MCF-7 cells compared to PEI1800/DNA complexes.
• No significant improvements in cellular internalization, nuclear accumulation, or transfection efficiency were observed in HeLa cells.

Conclusions:

• The NLS-I nonviral vector demonstrates targeted gene delivery capabilities for breast cancer cells.
• The NLS-I peptide enhances vector performance by increasing cellular uptake and nuclear targeting.
• This study presents a promising alternative nonviral delivery system for targeted gene therapy in breast cancer.