Abstract:
:Interferon-gamma (IFN-gamma) has potent immune stimulatory activity, but purifying recombinant protein is expensive, soluble cytokine delivery is inefficient, and high doses of IFN-gamma cause adverse systemic effects. We've shown, however, that chemically fixed, amended recombinant Pseudomonas fluorescens cells (ARCs), expressing soluble bovine IFN-gamma (BGI/ARCs), provide an effective production and delivery vehicle for highly active cytokine. In this report we investigate the immune enhancing activity of BGI/ARCs in the presence or absence of two other adjuvants which enhance cell recruitment and protein uptake. Adjuvant activity and immune-mediated protection was evaluated using recombinant, truncated glycoprotein-D (tgD) and a bovine herpesvirus-1 (BHV-1) disease challenge. Our initial dose-titration study showed that 100 microg of recombinant IFN-gamma in BGI/ARCs significantly increased both IgG1 and IgG2 tgD-specific antibody titres and IgG1/IgG2 ratios were significantly reduced with as little as 1.0 microg IFN-gamma. Vaccine formulation studies, using 20 microg tgD/vaccine dose and 100 microg IFN-gamma delivered in BGI/ARCs, formulated in phosphate buffered saline (PBS), induced significantly increased antibody responses, following both primary and secondary immunization, and immune-mediated protection following a BHV-1 respiratory infection. Co-formulating BGI/ARCs with either an oil and water emulsion (Emulsigen) or a polyphosphazene polymer (PCPP) did not significantly enhance tgD-specific antibody titres or disease protection when compared with BGI/ARCs alone. Surprisingly, co-delivering a single dose of BGI/ARCs with tgD protein in PBS had optimal adjuvant activity and the dose of IFN-gamma delivered was four-fold less than the dose previously shown to induce adverse systemic responses.
journal_name
Vaccinejournal_title
Vaccineauthors
Gaertner FH,Babiuk LA,Mutwiri G,Armstrong JM,Griebel PJdoi
10.1016/j.vaccine.2008.12.049subject
Has Abstractpub_date
2009-02-25 00:00:00pages
1377-85issue
9eissn
0264-410Xissn
1873-2518pii
S0264-410X(08)01773-8journal_volume
27pub_type
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