Improved gene transfer with histidine-functionalized mesoporous silica nanoparticles

Area of Science:

• Biomaterials Science
• Nanotechnology
• Gene Therapy

Background:

• Mesoporous silica nanoparticles (MSN) are promising for drug and gene delivery.
• Functionalization of MSN is crucial for optimizing their interaction with nucleic acids and cells.
• L-histidine functionalization offers potential advantages for gene delivery applications.

Purpose of the Study:

• To synthesize and characterize L-histidine-functionalized MSN (MSN-His) for plasmid DNA (pDNA) delivery.
• To evaluate the protective effect of MSN-His against DNase degradation of pDNA.
• To assess the transfection efficiency of MSN-His/pDNA complexes in vitro and in vivo.

Main Methods:

• Synthesis of aminopropyltriethoxysilane-functionalized MSN (MSN-NH2) followed by L-histidine conjugation (MSN-His).
• Gel shift assay to study pDNA complexation with MSN-NH2 and MSN-His.
• In vitro DNase protection assay.
• Cellular uptake studies.
• In vitro and in vivo transfection efficiency assessment in Achilles tendons.

Main Results:

• MSN-His demonstrated effective complexation with pDNA.
• MSN-His provided enhanced protection of pDNA against DNase degradation compared to MSN-NH2.
• MSN-His/pDNA complexes showed improved cellular uptake and transfection efficiency in vitro.
• Enhanced gene transfer efficiency was observed in vivo using MSN-His for delivery to Achilles tendons.

Conclusions:

• L-histidine functionalization of MSN significantly improves pDNA complexation, protection, and delivery efficiency.
• MSN-His represents a promising nanocarrier for enhanced gene therapy applications.
• The improved performance of MSN-His is attributed to better pDNA protection and enhanced cellular internalization.