title: Epigallocatechin gallate suppresses expression of receptor activator of NF-kappaB ligand (RANKL) in Staphylococcus aureus infection in osteoblast-like NRG cells.
abstract: Catechin, a constituent of tea, possesses various bioactivities. In particular, the most abundant catechin in tea is epigallocatechin gallate (EGCg), which has an anti-inflammatory effect. In the present study, the usability of EGCg for osteomyelitis treatment was examined. Osteomyelitis is a difficult disease to cure, partly due to bone lysis caused by infected osteoblasts. Since bone lysis is promoted by proinflammatory cytokines and the receptor activator of NF-kappaB ligand (RANKL), osteoblasts were infected with Staphylococcus aureus and the effect of EGCg on the production of cytokines was examined. It was found that the production of interleukin 6 and RANKL was suppressed in the osteoblasts treated with EGCg, which indicated an inflammation suppression effect of EGCg in osteomyelitis treatment.
authors.affiliation: Department of Orthopedic Surgery, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan.|Department of Microbiology and Immunology, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan.
authors.forename: Ikuo
authors.initials: I
authors.lastname: Ishida
authors.affiliation: Department of Microbiology and Immunology, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan.
authors.forename: Chikara
authors.initials: C
authors.lastname: Kohda
authors.affiliation: Department of Microbiology and Immunology, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan.
authors.forename: Yoko
authors.initials: Y
authors.lastname: Yanagawa
authors.affiliation: Department of Orthopedic Surgery, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan.
authors.forename: Hideyo
authors.initials: H
authors.lastname: Miyaoka
authors.affiliation: Department of Microbiology and Immunology, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan.
authors.forename: Tadakatsu
authors.initials: T
authors.lastname: Shimamura
mesh_terms: D000818:Animals; D002392:Catechin / Q000031:analogs & derivatives* / Q000494:pharmacology; D016207:Cytokines / Q000187:drug effects / Q000378:metabolism; D051379:Mice; D010006:Osteoblasts / Q000187:drug effects / Q000276:immunology / Q000378:metabolism* / Q000382:microbiology; D011480:Protease Inhibitors / Q000494:pharmacology*; D053245:RANK Ligand / Q000378:metabolism*; D013203:Staphylococcal Infections / Q000276:immunology / Q000378:metabolism*; D013211:Staphylococcus aureus
chemical_list: D016207:Cytokines; D011480:Protease Inhibitors; D053245:RANK Ligand; D002392:Catechin; C045651:epigallocatechin gallate