Biodegradable progesterone microsphere delivery system for osteoporosis therapy

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Endocrinology

Background:

• Osteoporosis is a significant health concern, particularly in postmenopausal women.
• Hormone replacement therapy, including progesterone, is a strategy for osteoporosis prevention and treatment.
• Effective drug delivery systems are needed to optimize progesterone therapy and minimize side effects.

Purpose of the Study:

• To formulate and characterize controlled-release biodegradable progesterone microspheres.
• To investigate the impact of process variables on microsphere properties and drug release.
• To evaluate the potential of these microspheres for long-term progesterone delivery in osteoporosis management.

Main Methods:

• Progesterone microspheres were prepared using poly(lactic acid-co-glycolic acid) (PLGA) and poly(L-lactic acid) (PLLA) via emulsion solvent evaporation.
• Process variables studied included volume fraction, polyvinyl alcohol (PVA) concentration, polymer composition, and stir speed.
• Characterization involved yield, encapsulation efficiency (EEF), particle size distribution, in vitro release, and surface morphology analysis.

Main Results:

• Increasing volume fraction enhanced EEF and decreased release rate.
• Higher PVA concentration increased release rate without affecting EEF.
• Polymer composition significantly influenced particle size, surface morphology, and release rate, with PGLA 50/50 showing the slowest release.
• Stir speed affected particle size and release rate.

Conclusions:

• Controlled release of progesterone is achievable by optimizing process variables in biodegradable microspheres.
• PLGA 50/50 microspheres demonstrate potential for sustained progesterone delivery over several months.
• This system offers a promising approach for the treatment or prevention of osteoporosis in postmenopausal women.