Optimized thermosensitive liposomes for selective doxorubicin delivery: formulation development, quality analysis and...

Area of Science:

• Pharmaceutical Sciences
• Biotechnology
• Oncology

Background:

• Chemotherapy often causes significant toxicity.
• Thermosensitive liposomal formulations (TL) offer a strategy to localize drug release.
• Minimizing general toxicity while maintaining efficacy is crucial for cancer therapy.

Purpose of the Study:

• To formulate and characterize novel doxorubicin-loaded thermosensitive liposomes (Dox-TL).
• To evaluate the in vitro biological activity and toxicity of Dox-TL.
• To assess the potential of Dox-TL combined with local hyperthermia for improved cancer treatment.

Main Methods:

• Formulation of Dox-TL with optimized lipid composition (DPPC:DSPC:Chol:DSPE-PEG-2000) and drug/lipid ratios.
• Assessment of drug loading efficiency, stability in serum, and drug leakage.
• In vitro cytotoxicity assays at physiological (37°C) and hyperthermic (42.5°C) temperatures.
• Evaluation of Dox-TL efficacy in terms of cell survival, proliferation, and cellular uptake.

Main Results:

• Optimized Dox-TL achieved 94% doxorubicin loading and demonstrated stability in serum after freeze-drying with sucrose.
• Dox-TL exhibited significantly lower toxicity at 37°C compared to free doxorubicin.
• At 42.5°C, Dox-TL showed comparable cell survival to free doxorubicin and superior suppression of proliferation and cellular uptake.

Conclusions:

• Novel Dox-TL formulations are stable and exhibit reduced toxicity at physiological temperatures.
• Combination of Dox-TL with local hyperthermia presents a promising strategy for safer and more effective antitumor therapy.
• These findings provide a foundation for developing advanced chemotherapy delivery systems.