Epigallocatechin-3-gallate, constituent of green tea, suppresses the LPS-induced phenotypic and functional maturation of murine dendritic cells through inhibition of mitogen-activated protein kinases and NF-kappaB |
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Authors: | Ahn Soon-Cheol Kim Gi-Young Kim Jin-Hyung Baik Seong-Wan Han Myung-Kwan Lee Hee-Jeong Moon Dong-Oh Lee Chang-Min Kang Ju-Hyung Kim Bo-Hye Oh Yang-Hyo Park Yeong-Min |
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Institution: | Department of Microbiology, Pusan National University College of Medicine, Pusan 602-739, Republic of Korea. |
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Abstract: | The effects of epigallocatechin-3-gallate (EGCG) on dendritic cells (DC) maturation were investigated. EGCG, in a dose-dependent manner, profoundly inhibited CD80, CD86, and MHC class I and II expression on bone marrow-derived murine myeloid DC. EGCG restored the decreased dextran-FITC uptake and inhibited enhanced IL-12 production by LPS-treated DC. EGCG-treated DC were poor stimulators of nai;ve allogeneic T-cell proliferation and reduced levels of IL-2 production in responding T cells. EGCG-pretreated DC inhibited LPS-induced MAPKs, such as ERK1/2, p38, JNK, and NF-kappaB p65 translocation. Therefore, the molecular mechanisms by which EGCG antagonized LPS-induced DC maturation appeared to involve the inhibition of MAPK and NF-kappaB activation. These novel findings provide new insight into the immunopharmacological role of EGCG and suggest a novel approach to the manipulation of DC for therapeutic application of autoimmune and allergic diseases. |
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Keywords: | Epigallocatechin-3-gallate Dendritic cell Mitogen-activated protein kinases NF-κB |
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