title: Development of hepatitis B oral vaccine using B-cell epitope loaded PLG microparticles.
abstract: Oral hepatitis B vaccine formulation was prepared by successful encapsulation of immunogenic peptide representing residues 127-145 of the immunodominant B-cell epitope of hepatitis B surface antigen (HBsAg) in poly(D,L-lactide co-glycolide) (PLG) microparticles. The smooth, spherical PLG microparticles with a diameter of around 10 microm was prepared by using W/O/W double emulsion solvent evaporation method. The entrapment efficiency of B-cell epitope peptide (BCEP) into PLG microparticles was 64%. In vitro studies showed B-cell epitope loaded PLG microparticles (BCEM) released the peptide in sustained profile and reached 64.9% efficiency by Day 25. Single oral immunization of mice with BCEM led to the significant induction of specific serum IgG and IgM anti-HB antibodies. After the termination of antibody induction, the orally immunized mice were infected with HBsAg, which resulted in the rapid production of antibodies against HBsAg as a result of secondary immune response. PLG microparticles formulation approach may have potential in increasing the efficacy of microparticulate systems for the oral administration of hepatitis B vaccine.
authors.affiliation: Bioorganic and Neurochemistry Laboratory, Central Leather Research Institute, Adyar, Chennai 600020, Tamilnadu, India.
authors.forename: R
authors.initials: R
authors.lastname: Rajkannan
authors.forename: M D
authors.initials: MD
authors.lastname: Dhanaraju
authors.forename: D
authors.initials: D
authors.lastname: Gopinath
authors.forename: D
authors.initials: D
authors.lastname: Selvaraj
authors.forename: R
authors.initials: R
authors.lastname: Jayakumar
mesh_terms: D000284:Administration, Oral; D000818:Animals; D018985:Epitopes, B-Lymphocyte; D005260:Female; D006510:Hepatitis B Antibodies / Q000097:blood; D006514:Hepatitis B Surface Antigens / Q000276:immunology; D017325:Hepatitis B Vaccines / Q000008:administration & dosage*; D019344:Lactic Acid / Q000008:administration & dosage*; D051379:Mice; D008807:Mice, Inbred BALB C; D008863:Microspheres; D011100:Polyglycolic Acid / Q000008:administration & dosage*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000008:administration & dosage*; D014611:Vaccination
chemical_list: D018985:Epitopes, B-Lymphocyte; D006510:Hepatitis B Antibodies; D006514:Hepatitis B Surface Antigens; D017325:Hepatitis B Vaccines; D011108:Polymers; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid