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Colchicine encapsulation within poly(ethylene glycol)-coated poly(lactic acid)/poly(epsilon-caprolactone)
1Department of Cardiology, University of Minnesota, Minneapolis 55455, USA.
Drug Delivery
|September 16, 2000
Summary
Researchers developed injectable, biodegradable microspheres to deliver colchicine, an antiproliferative agent, for treating restenosis. These polyethylene glycol (PEG)-coated microspheres offer controlled drug release, showing potential for sustained local therapy after vascular injury.
Area of Science:
- Biomaterials Science
- Vascular Biology
- Drug Delivery Systems
Background:
- Smooth muscle cell proliferation is a key factor in restenosis post-angioplasty.
- Effective local drug delivery to prevent restenosis remains a significant challenge.
- Injectable microspheres are needed for sustained high drug concentrations at injury sites.
Purpose of the Study:
- To develop and characterize biodegradable microspheres for entrapping and delivering colchicine.
- To investigate the potential of these microspheres for treating vascular restenosis.
Main Methods:
- Colchicine was entrapped in polyethylene glycol (PEG)-coated poly(lactic acid)/poly(epsilon-caprolactone) (PLA/PCL) microspheres.
- Microsphere formation involved solvent evaporation using a homogenizer.
- Characterization included scanning electron microscopy and in vitro drug release studies.
Main Results:
- Microspheres were spherical with a smooth surface, mean diameter of 3-6 microm.
- Colchicine recovery ranged from 30-50%.
- Drug release was controllable via particle size, loading, and PLA/PCL composition; PLA microspheres showed higher release (58.3%) than PCL (39.3%) over 30 days.
Conclusions:
- PEG-coated PLA/PCL microspheres can effectively entrap and control the release of colchicine.
- The drug release mechanism is primarily diffusion-controlled.
- These microspheres show promise for targeted, prolonged delivery of antiproliferative agents to prevent restenosis.