Mannose-6-phosphate-PEG-lipid conjugates improve liposomal uptake

Area of Science:

• Nanomedicine
• Drug Delivery
• Molecular Biology

Background:

• Targeted liposomes are crucial in nanomedicine for specific drug delivery.
• Mannose-6-phosphate (M6P) is a key molecular tag for lysosomal targeting.
• Current methods require improvement for efficient lysosomal drug delivery.

Purpose of the Study:

• To develop M6P-functionalized liposomes for enhanced lysosomal drug delivery.
• To investigate the specificity and efficiency of M6P-mediated liposome uptake.
• To explore the therapeutic potential for lysosomal storage diseases.

Main Methods:

• Synthesized M6P-targeting ligands and covalently coupled them to phospholipids via a polyethylene glycol (PEG) linker.
• Incorporated M6P-ligands into liposomes (approx. 100 nm size, -40 mV zeta potential).
• Assessed liposome internalization in cell lines and determined the uptake pathway (clathrin-mediated).

Main Results:

• M6P-liposomes demonstrated enhanced cellular uptake in a concentration-dependent manner (up to 14-fold increase).
• Specificity of M6P-mediated uptake was confirmed, as similar structures did not show the same effect.
• 72% of internalized M6P-liposomes were localized in the lysosomal compartment.

Conclusions:

• M6P-functionalized liposomes represent a modular platform for targeted lysosomal delivery.
• This approach significantly enhances liposome internalization and lysosomal association.
• M6P-liposomes offer a promising therapeutic strategy for lysosomal storage diseases.