[Comparison study of lipo PGE1 preparations]

Area of Science:

• Pharmaceutical Sciences
• Drug Delivery Systems
• Biotechnology

Background:

• Prostaglandin E1 (PGE(1)) is utilized clinically in lipid microsphere (LM) formulations.
• Variability in LM preparations may influence drug retention and therapeutic outcomes.
• Understanding formulation-dependent characteristics is crucial for optimizing PGE(1) delivery.

Purpose of the Study:

• To compare the aggregation susceptibility, LM retention, and pharmacological effects of three Lipo PGE(1) formulations (A, B, and C).
• To investigate the relationship between PGE(1) retention in LMs and its associated irritation and blood flow-inducing properties.

Main Methods:

• Assessed aggregation under alkali conditions with calcium ions.
• Determined PGE(1) percentage within LMs using 0.1 micrometer filtration.
• Evaluated PGE(1)-induced irritation and measured blood flow changes (peak and AUC) post-administration.

Main Results:

• Formulation A exhibited the highest PGE(1) retention (68.8%) in LMs, while Formulations B (43.0%) and C (13.9%) showed significant leakage.
• Formulation C displayed the most potent irritation, correlating with lower LM retention.
• Formulations A and B significantly increased blood flow compared to PGE(1) alone (PGE(1)-CD), with Formulation A showing the highest peak increase.

Conclusions:

• Significant differences exist among Lipo PGE(1) preparations, even with identical drug doses.
• PGE(1) retention within lipid microspheres is a critical factor influencing both local irritation and systemic pharmacological effects.
• Formulation A appears to offer superior drug retention and enhanced vasodilatory effects, suggesting improved therapeutic potential.