MutT Homolog 1 (MTH1) maintains multiple KRAS-driven pro-malignant pathways.
MutT Homolog 1 (MTH1) maintains multiple KRAS-driven pro-malignant pathways.
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Oncogenic RAS promotes production of reactive oxygen species (ROS), which mediate pro-malignant signaling but can also trigger DNA damage-induced tumor suppression. Thus RAS-driven tumor cells require redox-protective mechanisms to mitigate the damaging aspects of ROS. Here we show that MutT Homolog 1 (MTH1), the mammalian 8-oxodGTPase that sanitizes oxidative damage in the nucleotide pool, is important for maintaining several KRAS-driven pro-malignant traits in a nonsmall cell lung carcinoma (NSCLC) model. MTH1 suppression in KRAS-mutant NSCLC cells impairs proliferation and xenograft tumor formation. Furthermore, MTH1 levels modulate KRAS-induced transformation of immortalized lung epithelial cells. MTH1 expression is upregulated by oncogenic KRAS and correlates positively with high KRAS levels in NSCLC human tumors. At a molecular level, in p53-competent KRAS-mutant cells, MTH1 loss provokes DNA damage and induction of oncogene-induced senescence (OIS). In p53-nonfunctional KRAS-mutant cells, MTH1 suppression does not produce DNA damage but induces a reduced proliferative rate and an adaptive decrease in KRAS expression levels. Thus, MTH1 not only enables evasion of oxidative DNA damage and its consequences but can also function as a molecular rheostat for maintaining oncogene expression at optimal levels. Accordingly, our results indicate MTH1 is a novel and critical component of oncogenic KRAS-associated malignancy and its inhibition is likely to yield significant tumor-suppressive outcomes in KRAS-driven tumors.
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影响因子:
64.8
作者:
Di Micco, Raffaella;Fumagalli, Marzia;di Fagagna, Fabrizio d'Adda
通讯作者:
di Fagagna, Fabrizio d'Adda
影响因子:
4.1
作者:
Cho, William C. S.;Chow, Andrew S. C.;Au, Joseph S. K.
通讯作者:
Au, Joseph S. K.
影响因子:
4.8
作者:
Lee, AC;Fenster, BE;Finkel, T
通讯作者:
Finkel, T
DOI:
10.1073/pnas.92.20.9363
发表时间:
1995-09-26
影响因子:
11.1
作者:
DIMRI, GP;LEE, XH;CAMPISI, J
通讯作者:
CAMPISI, J
DOI:
10.1016/j.mrfmmm.2011.02.009
发表时间:
2011-05-10
影响因子:
2.3
作者:
Janik, Justyna;Swoboda, Maja;Speina, Elzbieta
通讯作者:
Speina, Elzbieta