Sodium selenite increases the activity of the tumor suppressor protein, PTEN, in DU-145 prostate cancer cells.

Sodium selenite increases the activity of the tumor suppressor protein, PTEN, in DU-145 prostate cancer cells.
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亚硒酸钠在DU-145前列腺癌细胞中增加了肿瘤抑制蛋白PTEN的活性。

DOI:
10.1080/01635580802521338
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发表时间:
2009
期刊:
Nutrition and cancer
影响因子:
--
通讯作者:
Meuillet EJ
Meuillet EJ
中科院分区:
其他
文献类型:
--
作者:
Berggren M;Sittadjody S;Song Z;Samira JL;Burd R;Meuillet EJ

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流行病学和临床数据表明,硒可能预防前列腺癌,然而硒对恶性前列腺细胞的细胞效应尚未被充分了解。我们先前报道,肿瘤抑制因子PTEN的活性以一种依赖氧化还原(RedOx)的方式受硫氧还蛋白(Trx)调节。在这项研究中,我们证明在亚硒酸钠(Se)处理5天后,硫氧还蛋白还原酶的活性在人前列腺癌细胞系DU - 145中增加了7倍。用不断增加浓度的硒处理DU - 145细胞,使PTEN脂质磷酸酶活性增加了2倍,这与磷酸化丝氨酸473 - Akt的减少以及磷酸化丝氨酸370 - PTEN水平的增加相关。硒还增加了CK2的活性,使用芹菜素(一种CK2抑制剂)表明,硒对肿瘤抑制因子PTEN的调节可能通过Trx - TR系统以及参与PTEN活性调节的激酶的氧化还原控制来实现。
Epidemiological and clinical data suggest that selenium may prevent prostate cancer, however the cellular effects of selenium in malignant prostate cells are not well understood. We previously reported that the activity of the tumor suppressor PTEN is modulated by thioredoxin (Trx) in a RedOx-dependent manner. In this study, we demonstrate that the activity of Trx Reductase is increased by seven-fold in the human prostate cancer cell line, DU-145, after five days of sodium selenite (Se) treatment. The treatment of DU-145 cells with increasing concentrations of Se induced an increase in PTEN lipid phosphatase activity by two-fold, which correlated with a decrease in phospho-Ser473-Akt, and an increase in phospho- Ser370-PTEN levels. Se also increased CK2 activity and the use of apigenin, an inhibitor of CK2, revealed that the regulation of the tumor suppressor PTEN by Se may be achieved via both the Trx-TR system and the RedOx control of the kinase involved in the regulation of PTEN activity.
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