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Immunomodulatory Effect of Laccase/Caffeic Acid and Transglutaminase in Alleviating Shrimp Tropomyosin (Met e 1) Allergenicity
journal contribution
posted on 2020-07-10, 12:36 authored by Ishfaq Ahmed, Hong Lin, Lili Xu, Shuang Li, Joana Costa, Isabel Mafra, Guanzhi Chen, Xiang Gao, Zhenxing LiThis work aimed to investigate the
effect of enzymatic cross-linking
on the allergenic potential of shrimp tropomyosin (TM), Met e 1. The
cross-linked TM with laccase (CL), laccase/caffeic acid (CLC and CLC+), and transglutaminase (CTG and CTG+) formed macromolecules
and altered the allergen conformation. The IgG/IgE-binding potentials
of the cross-linked TM were reduced as confirmed by Western blotting
and ELISA. Enzymatic cross-linking improved the gastrointestinal digestibility
and induced a lower level of degranulation in RBL-2H3 and KU812 cells.
Moreover, cross-linked TM decreased anaphylactic symptoms, as well
as reduced the serum levels of IgG1, IgE, histamine, tryptase, and
mMCP-1. In spleen cells, CLC+ and CTG+ downregulated
the Th2-related cytokines and upregulated IFN-γ and IL-10. These
findings revealed that CTG+ has shown more potential than
CLC+ in mitigating the allergenicity of TM by influencing
the conformational structure, enhancing the digestibility, decreasing
the cellular degranulation process, and positively modulating the
Th1/Th2 immunobalance.