Liposphere based lipoprotein-mimetic delivery system for 6-mercaptopurine

Area of Science:

• Pharmaceutical Sciences
• Nanotechnology
• Drug Delivery Systems

Background:

• Conventional chemotherapy faces challenges like poor bioavailability and short circulation times.
• Developing effective drug delivery systems is crucial for improving therapeutic outcomes in cancer treatment.

Purpose of the Study:

• To develop and characterize long-circulating lipospheres encapsulating 6-mercaptopurine (6-MP) for enhanced anticancer drug delivery.
• To evaluate the stealth properties, drug release profile, and pharmacokinetic behavior of the developed lipospheres.

Main Methods:

• Preparation of lipospheres via solidification of microemulsion with incorporated Palmitoyl PEG for stealth properties.
• Characterization of liposphere size (60-70 nm), drug entrapment (0.12 mmol/mole), and coating efficiency (63-71%).
• Assessment of zeta potential, stability, drug release kinetics (mixed profile), and in vivo pharmacokinetic behavior.

Main Results:

• Liposphere size was controlled by sonication time, achieving 60-70 nm after 8 hours.
• PEG coating reduced zeta potential, ensuring stability through steric repulsion and preventing aggregation.
• Stealth lipospheres demonstrated increased plasma drug concentration up to 24 hours, indicating prolonged circulation time and favorable tissue accumulation.

Conclusions:

• The developed stealth lipospheres are a promising carrier for 6-mercaptopurine, enhancing its circulation time and pharmacokinetic profile.
• This system offers an ideal approach for targeted and sustained anticancer drug delivery.
• Further research can explore the therapeutic efficacy of these lipospheres in preclinical cancer models.