MAPK/ERK通路
激酶
蛋白激酶A
补骨脂
信号转导
生物
细胞生物学
p38丝裂原活化蛋白激酶
生物化学
磷酸化
ASK1
化学
丝裂原活化蛋白激酶激酶
医学
病理
替代医学
作者
Christian Limper,Yao Wang,Sven Ruhl,Zhiqiang Wang,Yijia Lou,Frank Totzke,Michael H.G. Kubbutat,Yvonni Chovolou,Peter Proksch,Wim Wätjen
摘要
Abstract Objectives Psoralea corylifolia is a plant widely used in traditional Chinese medicine, e.g. for its chemopreventive effect. To identify active substances responsible for this effect, we investigated pharmacological effects of 11 compounds isolated from the seeds of this plant (newly described substances: 7, 2′, 4′-trihydroxy-3-arylcoumarin and psoracoumestan). Methods The influence of distinct compounds on different signal transduction pathways (cell proliferation, survival, angiogenesis and metastasis) was screened via analysis of the activity of 24 protein kinases, mitogen activated protein kinase phosphorylation via Western blot, cytotoxicity was shown using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay and determination of caspase activity. Oxidative stress was detected via 2′,7′-dichlorofluorescein fluorescence. Key findings Some compounds showed cytotoxic effects (H4IIE, Hct116, C6 cells) mainly mediated via induction of apoptosis. Distinct compounds caused a strong inhibition of MAPK/ERK kinase (MEK) phosphorylation, weak effects on extracellular-signal regulated kinase (ERK) phosphorylation and no significant effect on p38 and c-Jun amino-terminal kinase. Corylifol C and, to a lesser extent, xanthoangelol are potent protein kinase inhibitors (inhibitory concentration 50% values for epidermal growth factor receptor (EGFR): 1.1 and 4.4 × 10−6 μg/ml, respectively). Because EGFR, MEK and ERK are kinases involved in cellular proliferation, an inhibition of these enzymes may be useful to cause chemopreventive effects. Conclusions Distinct compounds isolated from P. corylifolia showed a high potential to influence cellular pathways, e.g. by inhibition of protein kinases that may be interesting for pharmacological purposes.
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