In vitro inhibitory effects of cirsiliol on IL-6-induced STAT3 activation through anti-inflammatory activity.


Immunoregulatory Materials Research Center, Korea Research Institute of Bioscience and Biotechnology, 181 Ipsin-gil, Jeongeup-si, Jeonbuk 56212, Republic of Korea. Electronic address: [Email]


Many studies have identified and described various medicinal effects of cirsiliol. Here, we investigated the signaling pathway involved in the anti-inflammatory effects of cirsiliol on IL-6-induced activity. Cirsiliol showed no cytotoxicity and inhibited pSTAT3-induced luciferase activity. At the molecular level, cirsiliol suppressed the expression of IL-6-induced inflammatory marker genes such as CRP, IL-1β, ICAM-1 and SOCS3, IL-6-induced activation of Jak2, gp130, STAT3 and ERK and nuclear translocation of STAT3, as measured by PCR, immunofluorescence staining and western blot analysis. However, the interaction between IL-6 and its receptor was not affected by cirsiliol treatment. These results indicate that cirsiliol attenuates IL-6-induced cellular signaling by regulating Jak2 phosphorylation. Therefore, cirsiliol could be a therapeutic agent for IL-6-related inflammatory diseases.



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