Artificial lipids stabilized camptothecin incorporated in liposomes

Area of Science:

• Pharmaceutical Sciences
• Drug Delivery
• Lipid Chemistry

Background:

• Camptothecin (CPT) is an anticancer agent, but its poor aqueous solubility limits therapeutic use.
• Liposomal formulations are crucial for improving CPT's drug delivery and efficacy.
• Artificial lipids (DBs) were investigated to enhance CPT incorporation and stability in liposomes.

Purpose of the Study:

• To increase the incorporation efficiency and stability of camptothecin (CPT) in liposomes.
• To evaluate the effect of three artificial lipids (DBs) on CPT-loaded liposomes.
• To understand the interaction between CPT and DBs within the liposome structure.

Main Methods:

• Liposomes were formulated using hydrogenated soybean phosphatidylcholine, cholesterol, and oleic acid.
• Three artificial lipids (4-n-(M12B), 3,5-bis(B12B), and 3,4,5-tris(dodecyloxy)benzoic acid (T12B)) were incorporated.
• CPT incorporation efficiency, stability, and drug-lipid interactions were analyzed using release assays and fluorescence polarization.

Main Results:

• DB-liposomes achieved up to 55% CPT incorporation efficiency and a 0.07 drug-to-lipid molar ratio.
• T12B demonstrated significantly greater stabilization of CPT within liposomes compared to other DBs.
• CPT release and fluorescence polarization indicated strong interactions between T12B and CPT, likely due to dodecyloxy group interactions with the lactone ring.

Conclusions:

• The artificial lipid T12B enhances CPT incorporation efficiency and stability in liposomes.
• T12B's structure facilitates strong interactions with CPT, potentially improving its drug delivery profile.
• This novel liposome formulation shows promise for the therapeutic application of camptothecin.