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Biodegradable cisplatin microspheres for direct brain injection: preparation and characterization
L García-Contreras1, K Abu-Izza, D R Lu
1Department of Pharmaceutics, College of Pharmacy, University of Georgia, Athens 30602, USA.
Pharmaceutical Development and Technology
|February 1, 1997
Summary
Researchers developed cisplatin-loaded PLGA microspheres for direct brain injection. These microspheres offer sustained drug release for over a month, showing potential for brain tumor treatment.
Area of Science:
- Biomaterials Science
- Drug Delivery Systems
- Neuro-oncology
Background:
- Biodegradable polymers like PLGA are crucial for controlled drug delivery.
- Direct brain injection requires specialized formulations for efficacy and safety.
- Cisplatin is a key chemotherapeutic agent for brain tumors.
Purpose of the Study:
- To prepare and characterize cisplatin-loaded PLGA microspheres for direct brain injection.
- To evaluate their physicochemical properties, in vitro drug release, and self-removal.
- To assess the potential of these microspheres for localized brain tumor therapy.
Main Methods:
- Microspheres prepared using emulsification/solvent evaporation with PLGA (50:50).
- Characterization included SEM, particle size analysis, entrapment efficiency, surface area, and density.
- In vitro release and degradation studies conducted in phosphate buffer and rat brain homogenate.
Main Results:
- Microspheres exhibited porous surfaces and smooth interiors, with particle sizes from 180-250 microns.
- Entrapment efficiency was ~70%, dependent on particle size.
- Sustained cisplatin release over 30 days observed, with lower release in rat brain homogenate (55%).
Conclusions:
- Cisplatin-loaded PLGA microspheres demonstrate sustained release and potential self-removal.
- These microspheres are suitable for direct brain injection and local delivery to brain tumors.
- Further research may validate their therapeutic efficacy in preclinical models.