Authors

A. Davoodi-Semiromi; M. Schreiber; S. Nalapalli; D. Verma; N. D. Singh; R. K. Banks; D. Chakrabarti;H. Daniell

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Abbreviated Journal Title

Plant Biotechnol. J.

Keywords

cholera; malaria; chloroplast; vaccine; oral delivery; lettuce; TOXIN-B-SUBUNIT; HEAT-LABILE ENTEROTOXIN; TRANSGENIC TOBACCO; CHLOROPLASTS; OUTER-MEMBRANE VESICLES; NONOBESE DIABETIC MICE; PLANT-BASED VACCINE; LACTUCA-SATIVA L.; PLASMODIUM-FALCIPARUM; ESCHERICHIA-COLI; PROTECTIVE ANTIGEN; Biotechnology & Applied Microbiology; Plant Sciences

Abstract

Cholera and malaria are major diseases causing high mortality The only licensed cholera vaccine is expensive, immunity is lost in children within 3 years and adults are not fully protected No vaccine is yet available for malaria Therefore, in this study, the cholera toxin-B subunit (CTB) of Vibrio cholerae fused to malarial vaccine antigens apical membrane antigen-1 (AMA1) and merozoite surface protein-1 (MSP1) was expressed in lettuce and tobacco chloroplasts Southern blot analysis confirmed homoplasmy and stable integration of transgenes CTB-AMA1 and CTB-MSP1 fusion proteins accumulated up to 13 17% and 10 11% (total soluble protein, TSP) in tobacco and up to 7 3% and 6 1 % (TSP) in lettuce, respectively Nine groups of mice (n = 10/group) were immunized subcutaneously (SQV) or orally (ORV) with purified antigens or transplastomic tobacco leaves Significant levels of antigen-specific antibody titres of immunized mice completely inhibited proliferation of the malarial parasite and cross-reacted with the native parasite proteins in immunoblots and immunofluorescence studies Protection against cholera toxin challenge in both ORV (100%) and SQV (89%) mice correlated with CTB-specific titres of intestinal, serum IgA and IgG1 in ORV and only IgG1 in SQV mice, but no other immunoglobu[in Increasing numbers of interleukin-10(+) T cell but not Foxp3(+) regulatory T cells, suppression of interferon-gamma and absence of interleukin-17 were observed in protected mice, Suggesting that immunity is conferred via the Th1/Th2 immune response Dual immunity against two major infectious diseases provided by chloroplast-derived vaccine antigens for long-term ( > 300 days, 50% Of mouse life span) offers a realistic platform for low cost vaccines and insight into mucosal and systemic immunity

Journal Title

Plant Biotechnology Journal

Volume

8

Issue/Number

2

Publication Date

1-1-2010

Document Type

Article

Language

English

First Page

223

Last Page

242

WOS Identifier

WOS:000274199600010

ISSN

1467-7644

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