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Epigallocatechin gallate affects human dendritic cell differentiation and maturation
Satomi Yoneyama1, Kazushige Kawai, Nelson H Tsuno
1Department of Surgical Oncology, Faculty of Medicine, University of Tokyo, Tokyo, Japan. yoneyamas-tky@umin.ac.jp
The Journal of Allergy and Clinical Immunology
|October 16, 2007
Summary
Epigallocatechin gallate (EGCG) from green tea induces immunosuppression by promoting apoptosis and downregulating key molecules in human monocyte-derived dendritic cells (MODCs). This impairs their ability to activate T cells, suggesting a role in immune modulation.
Area of Science:
- Immunology
- Cell Biology
- Pharmacology
Background:
- Epigallocatechin gallate (EGCG), a potent green tea catechin, exhibits anti-inflammatory and immunomodulatory properties.
- Dendritic cells (DCs) are crucial antigen-presenting cells that initiate T-cell-mediated immune responses.
Purpose of the Study:
- To investigate the impact of EGCG on human monocyte-derived DCs (MODCs).
- To assess the subsequent effects on T-cell-mediated immune responses.
Main Methods:
- MODCs were generated from peripheral blood monocytes cultured with GM-CSF and IL-4.
- EGCG's effects on apoptosis, phenotype, and function were analyzed and compared to dexamethasone.
- Expression of DC surface molecules (CD83, CD80, CD11c, MHC class II) and endocytotic ability were measured.
Main Results:
- EGCG induced apoptosis and altered the phenotype of developing DCs.
- EGCG downregulated essential DC surface molecules (CD83, CD80, CD11c, MHC class II) and suppressed endocytotic ability.
- EGCG-treated mature DCs inhibited allogeneic T-cell stimulation and increased IL-10 secretion.
Conclusions:
- EGCG induces immunosuppressive effects on human MODCs.
- These effects are mediated through apoptosis induction and suppression of cell surface molecules and antigen presentation.
