Author(s): Gong Z, Jin Y, Zhang Y
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Abstract Oral tolerance has been applied successfully as a potential therapeutic strategy for preventing and treating autoimmune diseases including type 1 diabetes. In this paper we constructed an edible vaccine consisting of a fusion protein composed of cholera toxin B subunit (CTB) and insulin B chain (InsB) that was produced in silkworm larvae. The silkworm larvae produced this fusion protein at levels of up to 0.97mg/ml of hemolymph as the pentameric CTB-InsB form, which retained the GM1-ganglioside binding affinity and the native antigenicity of CTB. Non-obese diabetic mice fed hemolymph containing microgram quantities of the CTB-InsB fusion protein showed a prominent reduction in pancreatic islet inflammation and a delay in the development of diabetic symptoms. This study demonstrates that silkworm-produced CTB-InsB fusion protein can be used as an ideal oral protein vaccine for induction of immunological tolerance against autoimmune diabetes.
This article was published in Vaccine
and referenced in Journal of Clinical & Cellular Immunology