title: Induction of mucosal and systemic immune responses by immunization with ovalbumin entrapped in poly(lactide-co-glycolide) microparticles.
abstract: We have examined the range of mucosal and systemic immune responses induced by oral or parenteral immunization with ovalbumin (OVA) entrapped in poly(D,L-lactide-co-glycolide) (PLG) microparticles. A single subcutaneous immunization with OVA-PLG primed significant OVA-specific IgG and delayed-type hypersensitivity (DTH) responses. The DTH responses were of similar magnitude to those obtained using immunostimulating complexes (ISCOMS) as a potent control adjuvant, although ISCOMS stimulated higher serum IgG responses. Both vectors also primed OVA-specific in vitro proliferative responses in draining lymph node cells following a single immunization and strong OVA-specific CTL responses were found after intraperitoneal (i.p.) immunization. ISCOMS were more efficient in inducing cytotoxic T lymphocytes (CTL), requiring much less antigen and only ISCOMS could stimulate primary OVA-specific CTL responses in the draining lymph nodes. Multiple oral immunizations with OVA in PLG microparticles or in ISCOMS resulted in OVA-specific CTL responses and again ISCOMS seemed more potent as fewer feeds were necessary. Lastly, multiple feeds of OVA in PLG microparticles generated significant OVA-specific intestinal IgA responses. This is the first demonstration that PLG microparticles can stimulate CTL responses in vivo and our results highlight their ability to prime a variety of systemic and mucosal immune responses which may be useful in future oral vaccine development.
authors.affiliation: Department of Immunology, University of Glasgow, U.K.
authors.forename: K J
authors.initials: KJ
authors.lastname: Maloy
authors.forename: A M
authors.initials: AM
authors.lastname: Donachie
authors.forename: D T
authors.initials: DT
authors.lastname: O'Hagan
authors.forename: A M
authors.initials: AM
authors.lastname: Mowat
mesh_terms: D000276:Adjuvants, Immunologic; D000284:Administration, Oral; D000818:Animals; D002455:Cell Division / Q000276:immunology; D000939:Epitopes / Q000276:immunology; D005260:Female; D006968:Hypersensitivity, Delayed / Q000276:immunology; D016882:ISCOMs / Q000276:immunology; D007114:Immunization / Q000379:methods*; D007074:Immunoglobulin G / Q000097:blood; D007279:Injections, Subcutaneous; D019344:Lactic Acid; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D010047:Ovalbumin / Q000008:administration & dosage / Q000276:immunology*; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers; D013601:T-Lymphocytes / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology
chemical_list: D000276:Adjuvants, Immunologic; D000939:Epitopes; D016882:ISCOMs; D007074:Immunoglobulin G; D011108:Polymers; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D010047:Ovalbumin