Volume 128, Issue 3 p. 862-874
Original Article

Lactococcus lactis harbouring Ara h 2.02 alleviates allergen-specific Th2-associated responses in sensitized mice

C.J. Chan

C.J. Chan

Faculty of Applied Sciences, UCSI University, UCSI Heights, Cheras, Kuala Lumpur, Malaysia

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Y.S. Yong

Y.S. Yong

Faculty of Applied Sciences, UCSI University, UCSI Heights, Cheras, Kuala Lumpur, Malaysia

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A.A.L. Song

A.A.L. Song

Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, University Putra Malaysia, UPM Serdang, Selangor, Malaysia

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R. Abdul Rahim

R. Abdul Rahim

Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, University Putra Malaysia, UPM Serdang, Selangor, Malaysia

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L.L.A. In

L.L.A. In

Faculty of Applied Sciences, UCSI University, UCSI Heights, Cheras, Kuala Lumpur, Malaysia

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R.L.H. Lim

Corresponding Author

R.L.H. Lim

Faculty of Applied Sciences, UCSI University, UCSI Heights, Cheras, Kuala Lumpur, Malaysia

Correspondence

Renee Lay Hong Lim, Faculty of Applied Sciences, UCSI University, No. 1, Jalan Menara Gading, UCSI Heights, Cheras, 56000 Kuala Lumpur, Malaysia.

E-mail: [email protected]

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First published: 23 November 2019
Citations: 4

Abstract

Aim

To study the prophylactic effect of recombinant Lactococcus lactis (rLl) harbouring Ara h 2.02 peanut allergen, in sensitized and challenged mice.

Methods and Results

Ara h 2.02 cDNA was cloned into pNZ8048 for heterologous expression in L. lactis. The purified recombinant allergen showed IgE binding comparable with native Ara h 2. Balb/c mice were fed with either recombinant (rLl), nonrecombinant L. lactis (Ll) or NaHCO3 (Sham) prior to sensitization and challenged with rAra h 2.02, whereas the baseline group was only fed with Ll. Allergen-specific immunoglobulin and splenocyte cytokines responses were determined for each mouse. Mice fed with either Ll or rLl showed significant alleviation of IgE and IgG1 compared to the Sham group. Despite no significant decrease in Th2 (IL-4, IL-13, IL-6) or increase in Th1 (IFN-γ) cytokines, both groups showed lower IL-10 level, while the IL-4 : IFN-γ ratio was significantly lower for rLl compared to Ll group.

Conclusions

Oral administration of rLl harbouring Ara h 2.02 demonstrated alleviation of Th2-associated responses in allergen-challenged mice and a possible added allergen-specific prophylactic effect.

Significance and Impact of the Study

Ara h 2.02 coupled with the intrinsic properties of probiotic L. lactis as a delivery vehicle can be explored for the development of a commercially scalable vaccine.

Conflict of Interest

The authors declare that they have no conflict of interest.