Thrombin-Inhibiting Anticoagulant Liposomes: Development and Characterization.

Area of Science:

• Biochemistry
• Drug Delivery
• Nanotechnology

Background:

• Peptides and peptidomimetics face rapid in vivo clearance, limiting their therapeutic potential.
• Strategies like oligomerization or polymer conjugation can enhance drug size and reduce clearance.

Purpose of the Study:

• To demonstrate a novel drug oligomerization strategy by incorporating peptidomimetic thrombin inhibitors onto liposome surfaces.
• To evaluate the efficacy and characteristics of these drug-loaded liposomes.

Main Methods:

• Thrombin inhibitor moieties were covalently coupled to palmitic acid via an ethylene glycol spacer.
• These modified inhibitors were incorporated into lipid mixtures for liposome preparation.
• Thrombin inhibitory potency and anticoagulant activity in plasma were measured.

Main Results:

• Liposomes exhibited strong thrombin inhibitory potency in enzyme kinetics.
• Significant anticoagulant activity was observed in plasma.
• High surface inhibitor density and positive zeta potential were indicated.

Conclusions:

• Liposome surface incorporation is a viable strategy for drug oligomerization to overcome rapid drug elimination.
• This approach can be extended to other drug molecules amenable to fatty acid modification.
• The method offers a promising avenue for developing more effective therapeutics with prolonged in vivo action.