Related Experiment Videos
[Oral tolerance induced by poly (lactide-co-glycolide) containing B lactoglobulin]
E Fattal1, P Couvreur, S Pecquet
1UMR CNRS 8612, Université Paris XI, Faculté de Pharmacie, 5 Rue Jean Bapitste Clément, F92296 Châtenay-Malabry.
Annales Pharmaceutiques Francaises
|April 27, 2002
Summary
Oral administration of beta-lactoglobulin (BLG) encapsulated in biodegradable microspheres effectively induces oral tolerance in mice. This allergy prevention method significantly reduces the protein dose required to suppress allergic responses.
Area of Science:
- Immunology
- Materials Science
- Gastroenterology
Background:
- Milk protein allergies are common in newborns.
- Oral tolerance induction is a key strategy for allergy prevention.
- Beta-lactoglobulin (BLG) is a major milk allergen.
Purpose of the Study:
- To develop biodegradable microspheres for oral delivery of BLG.
- To enhance oral tolerance induction and prevent milk allergies.
- To optimize microsphere formulation for efficient protein encapsulation and controlled release.
Main Methods:
- Entrapment of BLG into Poly(lactide-co-glycolide) microspheres using the emulsion solvent evaporation method.
- Formulation optimization using Tween 20 to improve encapsulation efficiency and control protein release.
- Oral administration of BLG-loaded microspheres to mice to assess oral tolerance induction.
Main Results:
- Tween 20 incorporation increased BLG encapsulation efficiency and reduced burst release.
- Oral administration of BLG microspheres significantly reduced the required protein dose (10,000-fold) for tolerance induction.
- Suppression of specific anti-BLG IgE and delayed-type hypersensitivity (DTH) responses was observed.
Conclusions:
- Biodegradable microspheres are effective systems for inducing oral tolerance.
- This approach shows promise for preventing milk protein allergies.
- Microsphere technology offers a strategy for controlled delivery of allergens to mucosal immune sites.