Ordinary plant tissue may boost vaccines beyond the antigen itself
Trujillo E, Angulo C.
Medicinal Plants
The tomatoes, potatoes, and leafy greens in your garden already contain compounds like flavonoids and alkaloids that can nudge an animal's immune system, long before anyone engineers them to carry a vaccine.
Scientists have been growing vaccines inside plants like lettuce, potatoes, and tobacco by engineering them to produce a piece of a virus or bacterium. But when researchers tested plain, non-engineered plant tissue as a control, they kept noticing something odd: the plain plant matter itself was stirring up immune responses. Natural plant chemicals like alkaloids, flavonoids, and carotenoids seem to be acting as built-in immune boosters, which means the plant isn't just a passive factory, it's an active ingredient too.
Key Findings
Multiple studies found that wild-type (non-transgenic) plant tissue used as an experimental control unexpectedly triggered immune effects like antibody production and cytokine changes.
Bioactive plant compounds implicated include alkaloids, flavonoids, terpenoids, glycoalkaloids, polysaccharides, glucosinolates, carotenoids, and phenolics, with effects varying by species.
In some animal models, plant tissue matrices provided partial pathogen protection and outperformed inert controls, complicating interpretation of vaccine efficacy trials.
chevron_right Technical Summary
Plants engineered to make edible vaccines might be doing more than delivering antigens: the plant tissue itself, even without the vaccine ingredient, can trigger real immune responses. That means the choice of plant, not just the engineered protein, could be part of why these vaccines work.
Abstract Preview
Original paper
Do plants used for vaccine production contribute to immunogenicity and immunoprotection beyond antigen expression?
Plant-based systems have proved to be a versatile platform for recombinant vaccine production. Numerous species of model and agronomic edible plants have been engineered to express antigens targeti...
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