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. 1994 Apr;81(4):661–667.

Induction of mucosal and systemic immune responses by immunization with ovalbumin entrapped in poly(lactide-co-glycolide) microparticles.

K J Maloy 1, A M Donachie 1, D T O'Hagan 1, A M Mowat 1
PMCID: PMC1422380  PMID: 7518802

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.

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Selected References

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