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Borneol and Luteolin from Chrysanthemum morifolium Regulate Ubiquitin Signal Degradation.
Journal of Agricultural and Food Chemistry 2018 August 9
Targeting the two degradation systems, ubiquitin proteasome pathway and ubiquitin signal autophagy lysosome system, plays an important function in cancer prevention. Borneol is called an "upper guiding drug". Luteolin has demonstrated anticancer activity. The fact that borneol regulates luteolin can be sufficient to serve as an alternative strategy. Borneol activates luteolin to inhibit E1 and 20S activity (IC50 = 118.8 ± 15.7 μM) and perturb the 26S proteasome structure in vitro. Borneol regulates luteolin to inhibit 26S activity (IC50 = 157 ± 19 μM), induces apoptosis (LC50 = 134 ± 4 μM), and causes pre-G1 and G0/G1 arrest in HepG2 cells. Borneol regulates luteolin to induce ubiquitin signal autophagic degradation, resulting in induction of E1, reduction of USP47, and accumulation of p62 in HepG2 reporter cells. Interestingly, luteolin decreased Ub conjugates, while borneol increased the accumulation of Ub conjugates in HepG2 reporter cells. E1, p62, and ubiquitin levels were downregulated in borneol-treated HepG2 reporter cells at 24 h. These observations suggest a potential autophagic inhibitor of borneol that may guide luteolin in the ubiquitin proteasome pathway and the ubiquitin signal autophagic degradation.
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