The increasing occurrences of allergic disorders may be attributed to exposure to environmental factors that contribute to the pathogenesis of allergy. The health benefits of green tea have been widely reported but are largely unsubstantiated. Theanine is the major amino acid present in green tea. In this study, we investigated the role of theanine in both IgE- and non- IgE-induced allergic response. Theanine inhibited compound 48/80-induced systemic anaphylactic shock and ear swelling responses. IgE-mediated passive cutaneous anaphylaxis was inhibited by the oral administration or pharmaceutical acupuncture of theanine. Histamine release from mast cells was decreased with the treatment of theanine. Theanine also repressed phorbol 12-myristate 13-acetate and calcium ionophore A23187-induced TNF-α, IL-1β, IL-6, and IL-8 secretion by suppressing NF-κB activation. Furthermore, theanine suppressed the activation of caspase-1 and the expression of receptor interacting protein-2. The current study demonstrates for the first time that theanine might possess mast cell-stabilizing capabilities.
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This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (No. 2005-0049404). We thank professor Seung-Youp Shin at Department of Otolaryngology, College of Medicine, Kyung Hee University, for helpful discussion and critical reading of the manuscript.
Conflict of interest
The authors have no financial conflict of interest.
N. H. Kim and H. J. Jeong contributed equally to this work.
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Kim, N.H., Jeong, H.J. & Kim, H.M. Theanine is a candidate amino acid for pharmacological stabilization of mast cells. Amino Acids 42, 1609–1618 (2012). https://doi.org/10.1007/s00726-011-0847-9
- Nuclear factor-κB
- Receptor interacting protein-2