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PEG-PLA-PEG block copolymeric nanoparticles for oral immunization against hepatitis B
Arvind K Jain1, Amit K Goyal, Neeraj Mishra
1Drug Delivery Research Laboratory, Department of Pharmaceutical Sciences, Dr. H.S. Gour Vishwavidyalaya Sagar (M.P.) 470003, India.
International Journal of Pharmaceutics
|December 17, 2009
Summary
New copolymeric nanoparticles enhance oral vaccine stability and efficacy. BAB nanoparticles show improved gut mucosal uptake and immune response compared to traditional PLA nanoparticles for hepatitis B vaccines.
Area of Science:
- Biomaterials Science
- Vaccinology
- Nanotechnology
Background:
- Poly(lactic acid)/poly(lactic-co-glycolic acid) (PLA/PLGA) nanoparticles are effective vaccine carriers but struggle with oral delivery due to gastric instability.
- Improving the stability of nanoparticles in the gastrointestinal tract is crucial for developing successful oral vaccines.
Purpose of the Study:
- To enhance the stability of PLA nanoparticles in the gastric environment by copolymerizing with polyethylene glycol (PEG).
- To evaluate the efficacy of novel copolymeric nanoparticles (PLA-PEG) encapsulating hepatitis B surface antigen (HBsAg) as an oral vaccine delivery system.
Main Methods:
- Formulation of PLA-PEG block copolymers (AB, ABA, BAB) encapsulating HBsAg.
- In vitro assessment of nanoparticle stability in simulated gastric and intestinal fluids.
- In vivo evaluation of nanoparticle uptake by gut mucosa in a mouse model.
- Assessment of immunogenicity, including humoral, mucosal (sIgA), and cellular (T(H)1) immune responses after oral administration.
Main Results:
- Copolymeric nanoparticles demonstrated superior stability, retaining encapsulated HBsAg and particle size after incubation in simulated gastric and intestinal fluids.
- Fluorescence microscopy revealed efficient uptake of copolymeric nanoparticles by the gut mucosa in immunized mice.
- Oral administration of BAB nanoparticles elicited significant humoral, mucosal (sIgA), and cellular (T(H)1) immune responses, unlike unstable PLA nanoparticles.
- BAB nanoparticles showed enhanced mucosal uptake and superior immune response compared to other copolymeric formulations.
Conclusions:
- Copolymerization of PLA with PEG significantly improves nanoparticle stability for oral vaccine delivery.
- BAB nanoparticles represent a promising carrier for oral immunization, demonstrating enhanced mucosal uptake and effective immune responses.
- This study highlights the potential of tailored nanoparticle design for overcoming challenges in oral vaccine delivery.
