Related Experiment Videos
New advances in vaccine delivery systems
J H Eldridge1, J K Staas, D Chen
1Department of Medicine, University of Alabama at Birmingham.
Seminars in Hematology
|October 1, 1993
Summary
Biodegradable microspheres made from poly(DL-lactide-co-glycolide) [DL-PLG] offer a promising vaccine delivery system. These microspheres enhance immune responses and mucosal immunity, showing potential for next-generation vaccines.
Area of Science:
- Biomaterials Science
- Vaccinology
- Immunology
Background:
- Next-generation vaccines require fewer administrations and mucosal immunity induction.
- Biodegradable poly(DL-lactide-co-glycolide) [DL-PLG] microspheres offer a potential solution for vaccine delivery.
Purpose of the Study:
- To evaluate the efficacy of DL-PLG microspheres as a vaccine delivery system.
- To assess the adjuvant activity and immune response generated by microencapsulated vaccines.
- To investigate the induction of mucosal immunity using DL-PLG microspheres.
Main Methods:
- Formulation of DL-PLG microspheres (1-10 microns) containing staphylococcal enterotoxin B (SEB) toxoid vaccine.
- Subcutaneous immunization of mice and intratracheal/oral administration in rhesus macaques.
- Evaluation of circulating and mucosal antibody responses, including challenge studies with simian immunodeficiency virus (SIV).
Main Results:
- Microsphere immunization (1-10 microns) potentiated circulating antitoxin response by 500-fold.
- Oral or intratracheal administration induced concurrent circulating and mucosal antibody responses.
- Microsphere-vaccinated macaques showed significant protection against SIV challenge, with reduced infection rates.
Conclusions:
- DL-PLG microspheres act as effective adjuvants, enhancing vaccine efficacy.
- This delivery system facilitates both systemic and mucosal immunity.
- DL-PLG microspheres represent a promising platform for developing advanced vaccines, including those for challenging pathogens like SIV.