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Lettuce-derived secretory IgA specifically neutralizes the Shiga toxin 1 activity

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Abstract

Main conclusion

An edible plant was tested as a host for the production of secretory monoclonal IgA against Shiga toxin 1 (Stx1). The lettuce-derived IgA completely protected Vero cells from Stx1.

Abstract

Secretory immunoglobulin A (SIgA) is thought to control mucosal infections and thus it may be applicable to oral passive immunotherapy. Edible plants are candidate hosts for producing oral formulations with SIgA against pathogenic agents. We previously established a recombinant IgA specific for the B subunit of Shiga toxin 1 (Stx1B) consisting of the Fab fragment of Stx1B-specific monoclonal IgG and the Fc region of IgA (hyIgA). Here, we developed transgenic lettuce (Lactuca sativa) that produces hyIgA in a secretory form (S-hyIgA). An Arabidopsis-derived light-harvesting complex II (LHCB) promoter was used for the expression of all four transgenes (hyIgA heavy, light and j chains, and secretory component). Agrobacterium-mediated transformation was carried out to introduce genes into lettuce leaf discs by means of a single vector harboring all four transgenes. Consistent with the tissue specificity of the LHCB promoter, the expression of hyIgA transgenes was observed in leaf and stem tissues, which contain chloroplasts, at the mRNA and protein levels. The leaves produced hyIgA in a more than tenfold higher yield as compared with stems. The lettuce-derived S-hyIgA was found to bind to Stx1B in a dose-dependent manner by means of ELISA. A leaf extract of the transgenic lettuce completely neutralized the cytotoxicity of Stx1 against Vero cells, which are highly susceptible to Stx1. In conclusion, we established a transgenic lettuce producing a secretory form of hyIgA that can bind bacterial toxin. The results indicate that edible practical plants containing S-hyIgA will provide a possible means for immunotherapy for food poisoning.

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Abbreviations

AmS:

Ammonium sulfate

DIG:

Digoxigenin

EHEC:

Enterohemorrhagic Escherichia coli

FBS:

Fetal bovine serum

FW:

Fresh weight

Gb3 :

Globotriaosylceramide

HRP:

Horseradish peroxidase

Hc:

Heavy chain

hyIgA:

Hybrid-IgG/IgA

Jc:

Joining chain

Lc:

Light chain

LHCB:

Light-harvesting complex II

mAb:

Monoclonal antibody

MS:

Murashige and Skoog

PBS:

Phosphate-buffered saline

pIgR:

Polymeric immunoglobulin receptor

SC:

Secretory component

S-hyIgA:

Secretory hybrid-IgG/IgA

SIgA:

Secretory IgA

Stx1:

Shiga toxin 1

Stx1A:

A subunit of Stx1

Stx1B:

B subunit of Stx1

T-DNA:

Transfer-DNA

TSP:

Total soluble protein

UBQ:

Ubiquitin extension protein

WT:

Wild-type

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Acknowledgements

This work was supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Numbers JP15H04660 and JP25670063 to YI; JP25·10915 to KN as well as by a research grant from the University of Shizuoka. We thank Dr. Hiroshi Asao (Nara Prefecture Agricultural Research and Development Center) for guidance for transformation of lettuce; and Mr. N.J. Halewood for language editing services.

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Correspondence to Yasuyuki Imai.

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Nakanishi, K., Matsuda, M., Ida, R. et al. Lettuce-derived secretory IgA specifically neutralizes the Shiga toxin 1 activity. Planta 250, 1255–1264 (2019). https://doi.org/10.1007/s00425-019-03215-1

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  • DOI: https://doi.org/10.1007/s00425-019-03215-1

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