Related Experiment Videos
Why does PEG 400 co-encapsulation improve NGF stability and release from PLGA biodegradable microspheres?
J M Péan1, F Boury, M C Venier-Julienne
1UPRES EA 2169, Faculté de Pharmacie, Angers, France.
Pharmaceutical Research
|September 1, 1999
Summary
Polyethylene glycol (PEG) 400 enhances nerve growth factor (NGF) stability and ensures continuous release from poly(lactic-co-glycolic acid) (PLGA) microspheres, improving drug delivery.
Area of Science:
- Biomaterials Science
- Drug Delivery Systems
- Protein Stabilization
Background:
- Poly(lactic-co-glycolic acid) (PLGA) microspheres are widely used for controlled drug release.
- Maintaining protein stability during encapsulation in PLGA microspheres is challenging.
- Nerve growth factor (NGF) is a crucial protein for neuronal health, requiring stable delivery systems.
Purpose of the Study:
- To elucidate the mechanism by which polyethylene glycol (PEG) 400 improves nerve growth factor (NGF) stability.
- To understand how PEG 400 facilitates continuous NGF release from PLGA microspheres.
- To investigate the role of PEG 400 in preventing premature protein aggregation and degradation during encapsulation.
Main Methods:
- Microspheres were prepared using the double emulsion method.
- Polyethylene glycol (PEG) 400 was co-encapsulated with nerve growth factor (NGF) at varying PEG/PLGA ratios.
- Interfacial tension studies and ELISA were employed to assess PEG 400's effect on protein stability and adsorption kinetics.
Main Results:
- Polyethylene glycol (PEG) 400 demonstrated a novel application in protein stabilization by limiting nerve growth factor (NGF) penetration into the primary emulsion's interfacial film.
- PEG 400 stabilized NGF by reducing its contact with the organic phase, thereby preventing irreversible anchorage.
- While increasing initial NGF release, PEG 400 prevented the release profile from leveling off, and NaCl addition modulated initial release rates without compromising protein stability.
Conclusions:
- Polyethylene glycol (PEG) 400 is highly effective in achieving sustained, continuous delivery of nerve growth factor (NGF) over seven weeks.
- Biodegradable microspheres prepared via the double emulsion technique incorporating PEG 400 offer a promising platform for protein therapeutics.
- The findings highlight PEG 400 as a key excipient for enhancing protein stability and controlling release kinetics in PLGA-based drug delivery systems.