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Anti-Inflammatory Effect of Ixeris dentata on Ultraviolet B-Induced HaCaT Keratinocytes  

Kim, Sung-Bae (College of Pharmacy and Wonkwang-Oriental Medicines Research Institute, Wonkwang University)
Kang, Ok-Hwa (College of Pharmacy and Wonkwang-Oriental Medicines Research Institute, Wonkwang University)
Keum, Joon-Ho (College of Pharmacy and Wonkwang-Oriental Medicines Research Institute, Wonkwang University)
Mun, Su-Hyun (College of Pharmacy and Wonkwang-Oriental Medicines Research Institute, Wonkwang University)
An, Hyun-Jin (College of Pharmacy and Wonkwang-Oriental Medicines Research Institute, Wonkwang University)
Jung, Hyun-Ju (College of Pharmacy and Wonkwang-Oriental Medicines Research Institute, Wonkwang University)
Hong, Seung-Heon (College of Pharmacy and Wonkwang-Oriental Medicines Research Institute, Wonkwang University)
Jeong, Dong-Myong (Department of Electronic Engineering, Wonkwang University)
Kweon, Kee-Tae (Ministry of Health and Welfare Office for Healthcare Policy Division of Traditional Korean Medicine)
Kwon, Dong-Yeul (College of Pharmacy and Wonkwang-Oriental Medicines Research Institute, Wonkwang University)
Publication Information
Natural Product Sciences / v.18, no.1, 2012 , pp. 60-66 More about this Journal
Abstract
Human skin is the first line of defense for the protection of the internal organs of the body from different stimuli. Ultraviolet B (UVB) irradiation induces skin damage and inflammation through the secretion of various cytokines, which are immune regulators produced by cells. To prevent the initiation of skin inflammation, keratinocytes that have been irreversibly damaged by radiation must be removed through the apoptotic mechanism. Ixeris dentata (family: Asteraceae) is a perennial medicinal herb indigenous to Korea. It has been used in Korea, China, and Japan to treat in digestion, pneumonia, diabetes, hepatitis, and tumors. To gain insight into the anti-inflammatory effects of I. dentata, we examined its influence on UVB-induced pro-inflammatory cytokine production in human keratinocytes (HaCaT cells), by observing cells that were stimulated with UVB in the presence or absence of I. dentata. In the present study, pro-inflammatory cytokine production was determined by performing enzyme-linked immunosorbent assay, reverse transcription polymerase chain reaction, and western blot analysis to measure the activation of mitogen-activated protein kinase (MAPKs). I. dentata inhibited UVBinduced production of the pro-inflammatory cytokine interleukin (IL)-6 in a dose-dependent manner. Further, I. dentata inhibited the UVB-induced expression of cyclooxygenase (COX)-2. Furthermore, I. dentata inhibited the phosphorylation of c-Jun NH2-terminal kinase and p38 MAPKs, suggesting that it inhibits the secretion of the pro-inflammatory cytokines IL-6 and IL-8, and COX-2 expression, by blocking MAPK phosphorylation. These results suggest that I. dentate can potentially protect against UVB-induced skin inflammation.
Keywords
Ixeris dentata; ultraviolet B; human keratinocytes;
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