期刊
MOLECULAR NEUROBIOLOGY
卷 55, 期 2, 页码 1259-1270出版社
HUMANA PRESS INC
DOI: 10.1007/s12035-017-0407-8
关键词
14-3-3 beta; Glioblastoma; Senescence; ERK
资金
- Basic Science Research Programs through National Research Foundation of Korea (NRF)
- National Research Council of Science and Technology [CAP-15-03-KRIBB]
- [2012R1A5A2047939]
The induction of senescence in cancer cells has recently been implicated as a mechanism of tumor regression in response to various modes of stress. 14-3-3 proteins are conserved scaffolding molecules that are involved in various cellular functions. Among the seven isoforms, 14-3-3 beta is specifically expressed in astrocytoma in correlation with the malignancy grade. We investigated the possible role of 14-3-3 beta in the regulation of senescence induction in A172 glioblastoma cells. The knockdown of 14-3-3 beta by specific small interfering RNA resulted in a significant change in cellular phenotypes and an increase in cells staining positive for senescence-associated beta-galactosidase. Western blotting of the 14-3-3 beta-depleted A172 cells revealed increased p27 expression and decreased SKP2 expression, while the expression of p53 and p21 was not altered. Subsequently, we demonstrated that ERK is a key modulator of SKP2/p27 axis activity in 14-3-3 beta-mediated senescence based on the following: (1) 14-3-3 beta knockdown decreased p-ERK levels; (2) treatment with U0126, an MEK inhibitor, completely reproduced the senescence morphology as well as the expression profiles of p27 and SKP2; and (3) the senescence phenotypes induced by 14-3-3 beta depletion were considerably recovered by constitutively active ERK expression. Our results indicate that 14-3-3 beta negatively regulates senescence in glioblastoma cells via the ERK/SKP2/p27 pathway. Furthermore, 14-3-3 beta depletion also resulted in senescence phenotypes in U87 glioblastoma cells, suggesting that 14-3-3 beta could be targeted to induce premature senescence as a therapeutic strategy against glioblastoma progression.
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