Caveolar Endocytosis Governs Nanoneedle Transfection

Area of Science:

• Cell Biology
• Biotechnology
• Nanotechnology

Background:

• Nanoneedles offer a promising method for genetic modification of primary human cells.
• Clinical translation is limited by the unclear mechanisms linking biointerface interactions to gene expression.

Purpose of the Study:

• To elucidate the mechanism of intracellular delivery and subsequent gene expression mediated by nanoneedles.
• To identify the cellular pathways essential for successful nanoneedle transfection.

Main Methods:

• Modulating Caveolin-1 expression in human regulatory T cells and MG63 cells.
• Investigating endolysosomal processing following nanoneedle delivery.
• Analyzing nucleic acid delivery efficiency and gene expression levels.

Main Results:

• Caveolae-mediated endocytosis, dependent on Caveolin-1, was identified as a key mechanism for nanoneedle transfection.
• Nucleic acids were delivered efficiently without Caveolin-1, but gene expression was absent.
• Gene expression was observed only when caveolar endocytosis was active.

Conclusions:

• Caveolin-1 and caveolae-mediated endocytosis are crucial for achieving functional gene expression after nanoneedle delivery.
• Successful nanoneedle transfection requires the engagement of specific cellular trafficking pathways beyond mere delivery.