MTH1 expression is required for effective transformation by oncogenic HRAS.
MTH1 expression is required for effective transformation by oncogenic HRAS.
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DOI:
10.18632/oncotarget.3447
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发表时间:
2015-05-10
期刊:
影响因子:
--
通讯作者:
Rai P
中科院分区:
文献类型:
--
作者:
Giribaldi MG;Munoz A;Halvorsen K;Patel A;Rai P
Due to sustaining elevated reactive oxygen species (ROS), oncogenic RAS-transformed cells upregulate redox-protective genes, among them the mammalian 8-oxodGTPase, MutT Homolog 1 (MTH1). We previously showed MTH1 abrogates RAS oncogene-induced senescence (OIS) in normal cells and that its inhibition compromises the tumorigenicity of established oncogenic RAS-harboring cancer cells. Here, we investigated how pre-transformation MTH1 levels in immortalized cells influence HRASV12-induced oncogenic transformation. We find MTH1 suppression prior to HRASV12 transduction into BEAS2B immortalized epithelial cells compromised maintenance of high RASV12- and oncogenic ROS-expressing cell populations. Furthermore, pre-transformation MTH1 levels modulated the efficiency of HRASV12-mediated soft agar colony formation. Downstream transformation-associated traits such as the epithelial-mesenchymal transition (EMT) were also compromised by MTH1 inhibition. These collective effects were observed to a greater degree in cells harboring high vs. low RASV12 levels, suggesting MTH1 is required for tumor cells to accumulate RAS oncoprotein. This is significant as, a priori, one cannot ascertain whether tumor-promoting adaptations wrought by introducing oncogenic RAS into an immortalized cell are capable of overcoming pre-transformation deficiencies. Our results suggest nucleotide pool sanitization comprises an important transformation-promoting requirement that, if compromised, cannot be adequately compensated post-transformation and thus is likely to affect optimal development and progression of RAS-driven tumors.
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影响因子:
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影响因子:
11.2
作者:
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通讯作者:
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影响因子:
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通讯作者:
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DOI:
10.1073/pnas.0809834106
发表时间:
2009-01-06
影响因子:
11.1
作者:
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通讯作者:
Weinberg, Robert A.