Mutant tristetraprolin: a potent inhibitor of malignant glioma cell growth.
Mutant tristetraprolin: a potent inhibitor of malignant glioma cell growth.
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DOI:
10.1007/s11060-013-1112-8
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发表时间:
2013-06
影响因子:
3.9
通讯作者:
King, Peter H.
中科院分区:
文献类型:
--
作者:
Suswam, Esther A.;Shacka, John J.;Walker, Kiera;Lu, Liang;Li, Xuelin;Si, Ying;Zhang, Xiaowen;Zheng, Lei;Nabors, L. Burt;Cao, Heping;King, Peter H.
Malignant gliomas rely on the production of certain critical growth factors including VEGF, interleukin (IL)-6 and IL-8, to fuel rapid tumor growth, angiogenesis, and treatment resistance. Post-transcriptional regulation through adenine and uridine-rich elements (ARE) of the 3′ untranslated region (UTR) is one mechanism for upregulating these and other growth factors. In glioma cells, we have shown that the post-transcriptional machinery is optimized for growth factor upregulation secondary to overexpression of the mRNA stabilizer, HuR. The negative regulator, tristetraprolin (TTP), on the other hand, may be suppressed because of extensive phosphorylation. Here we test that possibility by analyzing the phenotypic effects of a mutated form of TTP (mt-TTP) in which 8 phosphoserine residues were converted to alanines. We observed a significantly enhanced negative effect on growth factor expression in glioma cells at the post-transcriptional and transcriptional levels. The protein became stabilized and displayed significantly increased antiproliferative effects compared to wild-type TTP. Macroautophagy was induced with both forms of TTP, but inhibition of autophagy did not affect cell viability. We conclude that glioma cells suppress TTP function through phosphorylation of critical serine residues which in turn contributes to growth factor upregulation and tumor progression.
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影响因子:
10.5
作者:
Inda, Maria-del-Mar;Bonavia, Rudy;Furnari, Frank
通讯作者:
Furnari, Frank
影响因子:
37.3
作者:
Beier D;Schulz JB;Beier CP
通讯作者:
Beier CP
影响因子:
3.9
作者:
Liu, Qinglin;Li, Gang;Zhang, Jian
通讯作者:
Zhang, Jian
DOI:
10.1016/j.bbrc.2006.05.093
发表时间:
2006-07-21
影响因子:
3.1
作者:
Chen, Yu-Ling;Huang, Ya-Lin;Chang, Ching-Jin
通讯作者:
Chang, Ching-Jin
影响因子:
5.3
作者:
Clement, Sandra L.;Scheckel, Claudia;Lykke-Andersen, Jens
通讯作者:
Lykke-Andersen, Jens