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Yang, Ruige; Fu, Xiangjing; Fan, Jiangping; Wang, Tingting; Song, Jian; Xu, Ting; Guo, Yong; Zhang, Sai-Yang
Bioorganic & medicinal chemistry, 06/2024, Letnik: 107Journal Article
Display omitted •A series of novel honokiol thioethers bearing a 1,3,4-oxadiazole moiety were prepared.•Honokiol derivative 3k exhibited the best anti-proliferative activity against HCT116 cells.•3k can arrest HCT116 cells in G1 phase and induce HCT116 cell death.•3k directly inhibits the transcription and expression of YAP protein without activating the Hippo signaling pathway. Honokiol, derived from Magnolia officinalis (a traditional Chinese medicine), has been reported to have anticancer activity. Here, a series of novel honokiol thioethers bearing a 1,3,4-oxadiazole moiety were prepared and evaluated for their anticancer activities against three types of digestive system tumor cells. Biological evaluation showed that honokiol derivative 3k exhibited the best antiproliferative activity against HCT116 cells with an IC50 value of 6.1 μmol/L, superior to the reference drug 5-fluorouracil (IC50: 9.63 ± 0.27 µmol/L). The structure–activity relationships (SARs) indicated that the introduction of –(4-NO2)Ph, 3-pyridyl, –(2-F)Ph, –(4-F)Ph, –(3-F)Ph, –(4-Cl)Ph, and –(3-Cl)Ph groups was favorable for enhancing the anticancer activity of the title honokiol thioethers. Further study revealed that honokiol thioether 3k can well inhibit the proliferation of colon cancer cells HCT116, arresting the cells in G1 phase and inducing cell death. Moreover, a preliminary mechanism study indicated that 3k directly inhibits the transcription and expression of YAP protein without activating the Hippo signaling pathway. Thus, honokiol thioether 3k could be deeply developed for the development of honokiol-based anticancer candidates.
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