title: Effects of baicalin, baicalein, and wogonin on interleukin-6 and interleukin-8 expression, and nuclear factor-kappab binding activities induced by interleukin-1beta in human retinal pigment epithelial cell line.
abstract: The objective of the study was to investigate the effects of baicalin, baicalein, and wogonin (plant flavonoids) on interleukin-6 (IL-6) and interleukin-8 (IL-8) protein production, mRNA expression, and nuclear factor-kappaB (NF-kappaB) binding activities induced by interleukin-1beta (IL-1beta) in human retinal pigment epithelial cell line (ARPE-19) cells. To induce IL-6 and IL-8 mRNA expression and protein levels, IL-1beta was added to serum-free medium of ARPE-19 cells and incubated. The flavonoids were added to the medium. IL-6 and IL-8 in the media were measured using enzyme-linked immunosorbent assay. Both IL-6 and IL-8 mRNA were measured by semiquantitative reverse transcription polymerase chain reaction. The binding activities of the transcription factor NF-kappaB complexes to IL-6 and IL-8 were measured by electrophoretic mobility shift assay. IL-6 and IL-8 in the culture media of ARPE-19 cells were increased by IL-1beta in a dose-dependent manner. Baicalin did not suppress IL-1beta-induced IL-6 and IL-8 production, but dexamethasone, baicalein, and wogonin, significantly suppressed IL-6 and IL-8 production. Elevation of IL-6 and IL-8 mRNA was not suppressed by baicalin but was significantly suppressed by dexamethasone, baicalein, and wogonin. NF-kappaB binding activities were not suppressed by baicalin and baicalein, but was suppressed by wogonin. Wogonin and baicalein inhibited IL-1beta-induced IL-6 and IL-8 mRNA and protein production in ARPE-19 cells. The data suggest that wogonin may inhibit IL-6 and IL-8 mRNA expression via the suppression of NF-kappaB binding activities.
authors.affiliation: Department of Ophthalmology, Faculty of Medicine, Toyama Medical and Pharmaceutical University, 2630 Sugitani, Toyama 930-0194, Japan. ophthal@ms.toyama-mpu.ac.jp
authors.forename: Nobuo
authors.initials: N
authors.lastname: Nakamura
authors.forename: Seiji
authors.initials: S
authors.lastname: Hayasaka
authors.forename: Xue-Yun
authors.initials: XY
authors.lastname: Zhang
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Nagaki
authors.forename: Masayuki
authors.initials: M
authors.lastname: Matsumoto
authors.forename: Yoriko
authors.initials: Y
authors.lastname: Hayasaka
authors.forename: Katsutoshi
authors.initials: K
authors.lastname: Terasawa
mesh_terms: D000893:Anti-Inflammatory Agents / Q000494:pharmacology; D002460:Cell Line; D002470:Cell Survival; D003907:Dexamethasone / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D044950:Flavanones; D005419:Flavonoids / Q000494:pharmacology*; D006801:Humans; D007375:Interleukin-1 / Q000494:pharmacology*; D015850:Interleukin-6 / Q000378:metabolism*; D016209:Interleukin-8 / Q000378:metabolism*; D016328:NF-kappa B / Q000378:metabolism*; D010857:Pigment Epithelium of Eye / Q000378:metabolism*; D016133:Polymerase Chain Reaction / Q000379:methods; D012333:RNA, Messenger / Q000378:metabolism
chemical_list: D000893:Anti-Inflammatory Agents; D044950:Flavanones; D005419:Flavonoids; D007375:Interleukin-1; D015850:Interleukin-6; D016209:Interleukin-8; D016328:NF-kappa B; D012333:RNA, Messenger; C038044:baicalin; C006680:baicalein; D003907:Dexamethasone; C085514:wogonin