Gene delivery into brain capillary endothelial cells using Antp-modified DNA-loaded nanoparticles

Area of Science:

• Biotechnology
• Nanomedicine
• Cell Biology

Background:

• Brain capillary endothelial cells (BCECs) form the blood-brain barrier, presenting a challenge for drug and gene delivery.
• Developing effective nanoparticle systems for gene delivery to BCECs is crucial for treating neurological disorders.

Purpose of the Study:

• To evaluate DNA-loaded nanoparticles modified with Antennapedia peptide (Antp) for enhanced gene expression in BCECs.
• To compare the characteristics and efficiency of Chitosan (CH), polyethylenimine (PEI), and polyamidoamine (PAMAM) based nanoparticles.

Main Methods:

• Nanoparticles were prepared using CH, PEI, and PAMAM, with Lipofectamine 2,000 as a control.
• Incorporation efficiency, diameter, and stability were assessed using gel electrophoresis, PicoGreen assay, transmission electron microscopy, heparin, and DNase I.
• Gene expression was quantified using fluorescence microscopy and a luciferase assay system.

Main Results:

• DNA/CH and DNA/Lipofectamine 2,000 complexes showed no observable gene products in BCECs.
• DNA/PEI and DNA/PAMAM nanoparticles were internalized into BCECs, with Antp modification significantly enhancing expression efficiency.
• Antp modification increased nanoparticle diameter (100-200 nm) and improved stability against anionic substances and DNase I digestion.

Conclusions:

• Antp modification is a viable strategy to enhance the expression efficiency of DNA-loaded nanoparticles in BCECs.
• PEI and PAMAM based nanoparticles, when modified with Antp, demonstrate potential for effective gene delivery across the blood-brain barrier.