(–)-Epigallocatechingallate Interferes RANKL/RANK Signal Pathway and Induces Apoptosis during Osteoclastogenesis in RAW264 Cell — Oak Academic Publishing
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(–)-Epigallocatechingallate Interferes RANKL/RANK Signal Pathway and Induces Apoptosis during Osteoclastogenesis in RAW264 Cell
Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
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Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan;Center for Genomic Medicine, The Saitama Medical Research University, Hidakashi, Japan.
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Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
1 Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
2 Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan;Center for Genomic Medicine, The Saitama Medical Research University, Hidakashi, Japan.
3 Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
Green tea catechin, (–)-epigallocatechin-3-gallate [(–)-EGCG], was found to increase osteogenic functioning in mesenchymal stem cells. This study qualified EGCG, the strongest inhibitory efficiency for receptor activator of nuclear factor- κ B (NF- κ B) ligand (RANKL)-activated osteoclastogenesis among other green tea catechins for RAW264, a murine preosteoclast cell line. Moreover, EGCG inhibited tartrate-resistant acid phosphatase (TRAP)-positive multinucleated cell formation dose dependently in both single culture and co-culture systems, the expression of transcription factor, nuclear factor of activated T-cells, cytoplasmic 1 (NFATc1) and some osteoclastic genes. Especially, EGCG exhibited a strong inhibitory effect on the expression levels of RANK, the receptor of RANKL, and OSCAR, a key co-stimulator of the RANKL/RANK signal. Simultaneously, apoptotic genes expression and Hoechst staining revealed that EGCG induced apoptosis in RAW264. Taken together, these data suggest that the inhibitory effect of EGCG to osteoclastogenesis is associated with a down regulation of RANKL/RANK signal, and increased apoptosis of preosteoclasts.
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