Distinct Composition-dependent Biodis-tribution Patterns of Phospholipid Liposomes

Area of Science:

• Biomedical science
• Lipidomics
• Cell biology

Background:

• Phosphatidylserine (PS) and phosphatidylethanolamine (PE) are crucial signals for phagocytic clearance of apoptotic cells.
• Liposomes are widely used drug delivery systems, and their biodistribution is key to efficacy.

Purpose of the Study:

• To investigate and compare the in vivo biodistribution of liposomes containing different anionic phospholipids.
• To understand how phospholipid composition influences the biodistribution of liposomes.

Main Methods:

• Three types of phospholipid liposomes (DOPC/DOPS, DOPC/DOPE, DOPC/soybean PS) were prepared.
• Liposomes were intravenously injected into subjects.
• Biodistribution was analyzed by measuring radiant efficiency in various organs (lung, liver, kidney, heart).

Main Results:

• DOPC/DOPS liposomes exhibited higher average radiant efficiency in the lung, liver, kidney, and heart compared to DOPC/DOPE liposomes.
• DOPC/DOPS liposomes demonstrated significantly higher total and average radiant efficiency in the lung, liver, and kidney than DOPC/soybean PS liposomes.

Conclusions:

• The biodistribution of anionic phospholipid liposomes is significantly influenced by their specific phospholipid composition.
• These findings are critical for designing targeted liposomal drug delivery systems based on phospholipid characteristics.