Inhibitory effects of epi-sesamin on endothelial protein C receptor shedding in vitro and in vivo
Tóm tắt
Endothelial protein C receptor (EPCR) plays a pivotal role in augmenting Protein C activation by the thrombin–thrombomodulin complex. The activity of EPCR is markedly changed by ectodomain cleavage and release as the soluble protein (sEPCR). The EPCR shedding is mediated by the tumor necrosis factor-α converting enzyme (TACE). Epi-sesamin (ESM), from the roots of Asarum siebodlii, is known to exhibit anti-allergic and anti-fungal activities. However, little is known about the effects of ESM on EPCR shedding. We investigated this issue by monitoring the effects of ESM on phorbol-12-myristate 13-acetate (PMA), tumor necrosis factor (TNF)-α, interleukin (IL)-1β, and cecal ligation and puncture (CLP)-mediated EPCR shedding. Data showed that ESM induced potent inhibition of PMA, TNF-α, IL-1β, and CLP-induced EPCR shedding, likely through suppression of TACE expression. In addition, treatment with ESM resulted in a reduction of PMA-stimulated phosphorylation of p38, extracellular regulated kinases (ERK) 1/2, and c-Jun N-terminal kinase (JNK). Given these results, ESM should be viewed as a candidate therapeutic agent for treatment of various severe vascular inflammatory diseases via inhibition of EPCR shedding.
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