Traceless protein delivery with an efficient recyclable nanocarrier

Area of Science:

• Biomaterials Science
• Nanotechnology
• Cell Biology
• Drug Delivery

Background:

• Intracellular delivery of pharmaceutical proteins is crucial for their therapeutic efficacy.
• Existing methods often face challenges in efficiency and potential toxicity.
• Need for advanced nanocarriers capable of safe and effective protein transport into cells.

Purpose of the Study:

• To develop and evaluate a novel bio-recyclable nanocarrier for intracellular protein delivery.
• To investigate the loading, release, and cellular uptake mechanisms of the nanocarrier.
• To compare the efficiency of this nanocarrier with established cell-penetrating peptides.

Main Methods:

• Functionalization of calcium phosphate (CP) nanocarriers with vitamin B6 (pyridoxal-5'-phosphate, PLP).
• Loading and pH-sensitive release of proteins via aldimine bond formation/hydrolysis.
• Assessment of cellular delivery efficiency in HeLa, HepG2, and L929 cell lines.

Main Results:

• PLP-CP nanocarriers successfully loaded and released proteins in a pH-sensitive manner.
• Efficient delivery of proteins into the cytosol of various mammalian cell types.
• PLP-CP mediated cell transduction was 10-40 times more efficient than the TAT peptide.

Conclusions:

• Vitamin B6-functionalized calcium phosphate (PLP-CP) serves as an effective and bio-recyclable nanocarrier.
• The PLP-CP system demonstrates a traceless platform for high-efficiency protein delivery into mammalian cells.
• This approach holds significant promise for advancing protein-based therapeutics.