title: Biodegradable microparticles with an entrapped branched octameric peptide as a controlled-release HIV-1 vaccine.
abstract: Polyactide-co-glycolide microparticles, with an entrapped branched octameric peptide from human immunodeficiency virus (HIV-1), were prepared by a solvent evaporation method. The microparticles were characterized for size distribution, antigen loading level, and integrity. Mice in one group were each immunized with a single dose of a controlled-release microparticle formulation containing 300 micrograms of peptide and the serum IgG responses to the antigen were compared with those of mice from a second group that were immunized at 0, 4, and 26 weeks with 100-microgram doses of the same peptide immunogen adsorbed to alum. The controlled-release microparticles induced an antibody response comparable to that from the alum-immunized group. The subcutaneous and the intramuscular routes of administration were compared in additional groups of mice for the microparticles, and both routes induced similar responses. A suspending vehicle for the microparticles was also evaluated and did not affect the immunogenicity of the controlled-release formulation containing both small and large microparticles, although the immunogenicity of smaller microparticles immunized alone was affected.
authors.affiliation: United Biomedical, Inc., Hauppauge, NY 11788, USA.
authors.forename: M
authors.initials: M
authors.lastname: Singh
authors.forename: J P
authors.initials: JP
authors.lastname: McGee
authors.forename: X M
authors.initials: XM
authors.lastname: Li
authors.forename: W
authors.initials: W
authors.lastname: Koff
authors.forename: T
authors.initials: T
authors.lastname: Zamb
authors.forename: C Y
authors.initials: CY
authors.lastname: Wang
authors.forename: D T
authors.initials: DT
authors.lastname: O'Hagan
mesh_terms: D016915:AIDS Vaccines / Q000008:administration & dosage* / Q000276:immunology; D000818:Animals; D001673:Biodegradation, Environmental; D016503:Drug Delivery Systems; D005260:Female; D015483:HIV Antibodies / Q000097:blood; D015699:HIV Envelope Protein gp120 / Q000008:administration & dosage*; D019344:Lactic Acid / Q000008:administration & dosage*; D051379:Mice; D010446:Peptide Fragments / Q000008:administration & dosage*; D011100:Polyglycolic Acid / Q000008:administration & dosage*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000008:administration & dosage*
chemical_list: D016915:AIDS Vaccines; D015483:HIV Antibodies; D015699:HIV Envelope Protein gp120; D010446:Peptide Fragments; D011108:Polymers; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid