title: Anti-inflammatory activity of sugiol, a diterpene isolated from Calocedrus formosana bark.
abstract: Sugiol is a diterpene which was isolated and purified from alcohol extracts of the bark of Calocedrus formosana Florin (Cupressaceae). Although sugiol has low inhibitory activity against the DPPH radical, it could effectively reduce intracellular reactive oxygen species (ROS) production in lipopolysaccharide (LPS)-stimulated macrophages. The present study investigated the potential anti-inflammatory activity of sugiol, and the relationship between signal transduction and inflammatory cytokines in vitro. A dose of 30 microM of sugiol was effectively inhibitory for proIL-1beta, IL-1beta and TNF-alpha production, suggesting that sugiol is bioactive against inflammation. Moreover, sugiol reveals a capacity for suppressing the activation of mitogen-activated protein kinases (MAPKs), including extracellular signal-regulated kinase (ERK), c-Jun NH2-terminal kinase (JNK), and p38 mitogen-activated protein kinase (p38) activated by LPS-stimulation in J774A.1 murine macrophages. A low dosage of 10 microM of sugiol completely inhibited ERK1/2 phosphorylation, while 30 microM effectively inhibited JNK1/2 and p38 phosphorylation in LPS-stimulated macrophages. In addition, sugiol significantly inhibited LPS-induced ROS production. Our studies suggest that sugiol's efficacy in inhibiting the inflammatory cytokines of IL-1beta and TNF-alpha could be attributed to a reduction of the ROS that leads to a decrease in the phosphorylation of MAPKs.
authors.affiliation: Department of Biological Science and Technology, Chung Hwa College of Medical Technology, Tainan, Taiwan, Republic of China.
authors.forename: Kuo-Ping
authors.initials: KP
authors.lastname: Chao
authors.forename: Kuo-Feng
authors.initials: KF
authors.lastname: Hua
authors.forename: Hsien-Yeh
authors.initials: HY
authors.lastname: Hsu
authors.forename: Yu-Chang
authors.initials: YC
authors.lastname: Su
authors.forename: Shang-Tzen
authors.initials: ST
authors.lastname: Chang
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D001713:Biphenyl Compounds; D029779:Cupressaceae; D016207:Cytokines / Q000187:drug effects; D004224:Diterpenes / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D004305:Dose-Response Relationship, Drug; D008070:Lipopolysaccharides; D008264:Macrophages / Q000187:drug effects* / Q000378:metabolism; D051379:Mice; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D008517:Phytotherapy; D010851:Picrates / Q000737:chemistry; D024301:Plant Bark; D010936:Plant Extracts / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D017382:Reactive Oxygen Species / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D001713:Biphenyl Compounds; D016207:Cytokines; D004224:Diterpenes; D008070:Lipopolysaccharides; D010851:Picrates; D010936:Plant Extracts; D017382:Reactive Oxygen Species; C501333:sugiol; C004931:1,1-diphenyl-2-picrylhydrazyl; D020928:Mitogen-Activated Protein Kinases