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Brain tumor senescence might be mediated by downregulation of S-phase kinase-associated protein 2 via butylidenephthalide leading to decreased cell viability

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Tumor Biology

Abstract

Develo** an effective drug for treating human glioblastoma multiform (GBM) has been investigated persistently. A pure compound butylidenephthalide (BP), isolated from Angelica sinensis, has been shown the activities to arrest the growth and initiate apoptosis of GBM in our previous reports. In this study, we further demonstrated that BP treatment accelerates the cell senescence in a dose-dependent manner in vitro and in vivo. S-phase kinase-associated protein 2 (Skp2), a proto-oncogene, is generally upregulated in cancer. We found that it was downregulated in BP-treated GBM cells. The downregulation of Skp2 is parallel with increasing p16 and p21 expression which causes G0/G1 arrest and tumor cell senescence. We also found that restoring the Skp2 protein level by exogenous overexpression prevents the BP-induced cell senescence. Therefore, the linkage between cell senescence and Skp2 expression is strengthened. Promoter binding analysis further detailed that the BP-mediated SP1 reduction might involve in the Skp2 downregulation. In summary, these results emphasize that BP-triggered senescence in GBM cells is highly associated with its control on Skp2 regulation.

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Abbreviations

BP:

Butylidenephthalide

GBM:

Glioblastoma multiform

Skp2:

S-phase kinase-associated protein 2

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Acknowledgments

This work was supported by National Science Council of the Republic of China (NSC 102-2320-B-039-011), Taiwan Department of Health Clinical Trial and Research Center of Excellence (DOH102-TD-B-111-004); Aim for the Top University Plan of the National Chiao Tung University and Ministry of Education, Cancer Research Center of Excellence (Taiwan) and Ministry of Economic Affairs (102-EC-17-A-19-I1-0051).

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Correspondence to Horng-Jyh Harn.

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H.-L. Su and H.-J. Harn contributed equally to this work.

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Huang, MH., Lin, SZ., Lin, PC. et al. Brain tumor senescence might be mediated by downregulation of S-phase kinase-associated protein 2 via butylidenephthalide leading to decreased cell viability. Tumor Biol. 35, 4875–4884 (2014). https://doi.org/10.1007/s13277-014-1639-0

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